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Rengefors K, Annenkova N, Wallenius J, Svensson M, Kremp A, Ahrén D. Population genomic analyses reveal that salinity and geographic isolation drive diversification in a free-living protist. Sci Rep 2024; 14:4986. [PMID: 38424140 PMCID: PMC10904836 DOI: 10.1038/s41598-024-55362-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2023] [Accepted: 02/22/2024] [Indexed: 03/02/2024] Open
Abstract
Protists make up the vast diversity of eukaryotic life and play a critical role in biogeochemical cycling and in food webs. Because of their small size, cryptic life cycles, and large population sizes, our understanding of speciation in these organisms is very limited. We performed population genomic analyses on 153 strains isolated from eight populations of the recently radiated dinoflagellate genus Apocalathium, to explore the drivers and mechanisms of speciation processes. Species of this genus inhabit both freshwater and saline habitats, lakes and seas, and are found in cold temperate environments across the world. RAD sequencing analyses revealed that the populations were overall highly differentiated, but morphological similarity was not congruent with genetic similarity. While geographic isolation was to some extent coupled to genetic distance, this pattern was not consistent. Instead, we found evidence that the environment, specifically salinity, is a major factor in driving ecological speciation in Apocalathium. While saline populations were unique in loci coupled to genes involved in osmoregulation, freshwater populations appear to lack these. Our study highlights that adaptation to freshwater through loss of osmoregulatory genes may be an important speciation mechanism in free-living aquatic protists.
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Affiliation(s)
- Karin Rengefors
- Department of Biology, Lund University, 223 62, Lund, Sweden.
| | - Nataliia Annenkova
- Department of Biology, Lund University, 223 62, Lund, Sweden
- Institute of Cytology of the Russian Academy of Science, Tikhoretsky Avenue 4, St. Petersburg, 194064, Russia
| | - Joel Wallenius
- Department of Biology, Lund University, 223 62, Lund, Sweden
- Department of Clinical Sciences, Faculty of Medicine, Lund University, 223 62, Lund, Sweden
| | - Marie Svensson
- Department of Biology, Lund University, 223 62, Lund, Sweden
| | - Anke Kremp
- Biology Department, Leibniz Institute for Baltic Sea Research Warnemuende, Seestr. 15, 18119, Rostock, Germany
| | - Dag Ahrén
- Department of Biology, Lund University, 223 62, Lund, Sweden
- National Bioinformatics Infrastructure Sweden (NBIS), SciLifeLab, Department of Biology, Lund University, Lund, Sweden
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2
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Sefbom J, Kremp A, Hansen PJ, Johannesson K, Godhe A, Rengefors K. Local adaptation through countergradient selection in northern populations of Skeletonema marinoi. Evol Appl 2023; 16:311-320. [PMID: 36793694 PMCID: PMC9923485 DOI: 10.1111/eva.13436] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2022] [Revised: 05/31/2022] [Accepted: 06/07/2022] [Indexed: 11/26/2022] Open
Abstract
Marine microorganisms have the potential to disperse widely with few obvious barriers to gene flow. However, among microalgae, several studies have demonstrated that species can be highly genetically structured with limited gene flow among populations, despite hydrographic connectivity. Ecological differentiation and local adaptation have been suggested as drivers of such population structure. Here we tested whether multiple strains from two genetically distinct Baltic Sea populations of the diatom Skeletonema marinoi showed evidence of local adaptation to their local environments: the estuarine Bothnian Sea and the marine Kattegat Sea. We performed reciprocal transplants of multiple strains between culture media based on water from the respective environments, and we also allowed competition between strains of estuarine and marine origin in both salinities. When grown alone, both marine and estuarine strains performed best in the high-salinity environment, and estuarine strains always grew faster than marine strains. This result suggests local adaptation through countergradient selection, that is, genetic effects counteract environmental effects. However, the higher growth rate of the estuarine strains appears to have a cost in the marine environment and when strains were allowed to compete, marine strains performed better than estuarine strains in the marine environment. Thus, other traits are likely to also affect fitness. We provide evidence that tolerance to pH could be involved and that estuarine strains that are adapted to a more fluctuating pH continue growing at higher pH than marine strains.
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Affiliation(s)
- Josefin Sefbom
- Department of Marine Sciences University of Gothenburg Gothenburg Sweden
| | - Anke Kremp
- Marine Research Centre Finnish Environment Institute (SYKE) Helsinki Finland.,Biological Oceanography Leibniz Institute for Baltic Sea Research Warnemünde Rostock Germany
| | - Per Juel Hansen
- Marine Biological Section University of Copenhagen Helsingør Denmark
| | - Kerstin Johannesson
- Department of Marine Sciences - Tjärnö University of Gothenburg Strömstad Sweden
| | - Anna Godhe
- Department of Marine Sciences University of Gothenburg Gothenburg Sweden
| | - Karin Rengefors
- Aquatic Ecology, Department of Biology Lund University Lund Sweden
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3
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Reñé A, Alacid E, Vishnyakov AE, Seto K, Tcvetkova VS, Gordi J, Kagami M, Kremp A, Garcés E, Karpov SA. The new chytridiomycete Paradinomyces triforaminorum gen. et sp. nov. co-occurs with other parasitoids during a Kryptoperidinium foliaceum (Dinophyceae) bloom in the Baltic Sea. Harmful Algae 2022; 120:102352. [PMID: 36470607 DOI: 10.1016/j.hal.2022.102352] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2022] [Revised: 10/14/2022] [Accepted: 11/10/2022] [Indexed: 06/17/2023]
Abstract
A new chytrid genus and species was isolated and cultured from samples obtained in the Baltic Sea during a dinoflagellate bloom event. This species is characterized by having a spherical sporangium without papillae and zoospores of 2-3 µm in diameter that are released through 3 discharge pores. Molecular phylogeny based on ribosomal operon showed its sister position to the Dinomyces cluster in Rhizophydiales. Zoospores lack fenestrated cisternae but contain a paracrystalline inclusion, found in a Rhizophydiales representative for the first time. Additionally, the kinetid features are uncommon for Rhizophydiales and only observed in Dinomyces representatives so far. These morphological features and its phylogenetic relationships justify the description of the new genus and speciesParadinomyces triforaminorum gen. nov. sp. nov. belonging to the family Dinomycetaceae. The chytrid was detected during a high-biomass bloom of the dinoflagellate Kryptoperidinium foliaceum. Laboratory experiments suggest this species is highly specific and demonstrate the impact it can have on HAB development. The chytrid co-occurred with three other parasites belonging to Chytridiomycota (Fungi) and Perkinsea (Alveolata), highlighting that parasitic interactions are common during HABs in brackish and marine systems, and these multiple parasites compete for similar hosts.
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Affiliation(s)
- Albert Reñé
- Departament de Biologia Marina i Oceanografia. Institut de Ciències del Mar (CSIC). Passeig Marítim de la Barceloneta, 37-49 08003 Barcelona, Catalonia, Spain.
| | - Elisabet Alacid
- Department of Zoology. University of Oxford. 11a Mansfield Rd, Oxford, OX1 3SZ, United Kingdom
| | - Andrey E Vishnyakov
- Department of Invertebrate Zoology, Biological Faculty, St Petersburg State University, Universitetskaya nab. 7/9, St Petersburg, 199034, Russia
| | - Kensuke Seto
- Yokohama National University, Faculty of Environment and Information Sciences, Tokiwadai 79-7, Hodogayaku, Yokohama, Kanagawa, 240-8501, Japan
| | - Victoria S Tcvetkova
- Department of Invertebrate Zoology, Biological Faculty, St Petersburg State University, Universitetskaya nab. 7/9, St Petersburg, 199034, Russia
| | - Jordina Gordi
- Departament de Biologia Marina i Oceanografia. Institut de Ciències del Mar (CSIC). Passeig Marítim de la Barceloneta, 37-49 08003 Barcelona, Catalonia, Spain
| | - Maiko Kagami
- Yokohama National University, Faculty of Environment and Information Sciences, Tokiwadai 79-7, Hodogayaku, Yokohama, Kanagawa, 240-8501, Japan
| | - Anke Kremp
- Biological Oceanography, Leibniz Institute for Baltic Sea Research Warnemuende, Seestrasse 15 Rostock, 18119, Germany
| | - Esther Garcés
- Departament de Biologia Marina i Oceanografia. Institut de Ciències del Mar (CSIC). Passeig Marítim de la Barceloneta, 37-49 08003 Barcelona, Catalonia, Spain
| | - Sergey A Karpov
- Department of Invertebrate Zoology, Biological Faculty, St Petersburg State University, Universitetskaya nab. 7/9, St Petersburg, 199034, Russia; Zoological Institute of Russian Academy of Sciences, Universitetskaya nab. 1, St Petersburg, 199034, Russia; North-Western State Medical University named after I.I. Mechnikov, Kirochnaya st. 41, St Petersburg, 191015, Russia
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4
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Pinseel E, Nakov T, Van den Berge K, Downey KM, Judy KJ, Kourtchenko O, Kremp A, Ruck EC, Sjöqvist C, Töpel M, Godhe A, Alverson AJ. Strain-specific transcriptional responses overshadow salinity effects in a marine diatom sampled along the Baltic Sea salinity cline. ISME J 2022; 16:1776-1787. [PMID: 35383290 PMCID: PMC9213524 DOI: 10.1038/s41396-022-01230-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2021] [Revised: 03/16/2022] [Accepted: 03/21/2022] [Indexed: 05/01/2023]
Abstract
The salinity gradient separating marine and freshwater environments represents a major ecological divide for microbiota, yet the mechanisms by which marine microbes have adapted to and ultimately diversified in freshwater environments are poorly understood. Here, we take advantage of a natural evolutionary experiment: the colonization of the brackish Baltic Sea by the ancestrally marine diatom Skeletonema marinoi. To understand how diatoms respond to low salinity, we characterized transcriptomic responses of acclimated S. marinoi grown in a common garden. Our experiment included eight strains from source populations spanning the Baltic Sea salinity cline. Gene expression analysis revealed that low salinities induced changes in the cellular metabolism of S. marinoi, including upregulation of photosynthesis and storage compound biosynthesis, increased nutrient demand, and a complex response to oxidative stress. However, the strain effect overshadowed the salinity effect, as strains differed significantly in their response, both regarding the strength and the strategy (direction of gene expression) of their response. The high degree of intraspecific variation in gene expression observed here highlights an important but often overlooked source of biological variation associated with how diatoms respond to environmental change.
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Affiliation(s)
- Eveline Pinseel
- Department of Biological Sciences, University of Arkansas, Fayetteville, AR, USA.
| | - Teofil Nakov
- Department of Biological Sciences, University of Arkansas, Fayetteville, AR, USA
| | - Koen Van den Berge
- Department of Statistics, University of California, Berkeley, CA, USA
- Department of Applied Mathematics, Computer Science and Statistics, Ghent University, Ghent, Belgium
- Bioinformatics Institute Ghent, Ghent University, Ghent, Belgium
| | - Kala M Downey
- Department of Biological Sciences, University of Arkansas, Fayetteville, AR, USA
| | - Kathryn J Judy
- Department of Biological Sciences, University of Arkansas, Fayetteville, AR, USA
| | - Olga Kourtchenko
- Department of Marine Sciences, University of Gothenburg, Gothenburg, Sweden
| | - Anke Kremp
- Leibniz-Institute for Baltic Sea Research Warnemünde, Rostock, Germany
| | - Elizabeth C Ruck
- Department of Biological Sciences, University of Arkansas, Fayetteville, AR, USA
| | - Conny Sjöqvist
- Environmental and Marine Biology, Åbo Akademi University, Åbo, Finland
| | - Mats Töpel
- Department of Marine Sciences, University of Gothenburg, Gothenburg, Sweden
| | - Anna Godhe
- Department of Marine Sciences, University of Gothenburg, Gothenburg, Sweden
| | - Andrew J Alverson
- Department of Biological Sciences, University of Arkansas, Fayetteville, AR, USA.
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5
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Jerney J, Rengefors K, Nagai S, Krock B, Sjöqvist C, Suikkanen S, Kremp A. Seasonal genotype dynamics of a marine dinoflagellate: Pelagic populations are homogeneous and as diverse as benthic seed banks. Mol Ecol 2021; 31:512-528. [PMID: 34716943 PMCID: PMC9298838 DOI: 10.1111/mec.16257] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2021] [Revised: 10/19/2021] [Accepted: 10/25/2021] [Indexed: 11/27/2022]
Abstract
Genetic diversity is the basis for evolutionary adaptation and selection under changing environmental conditions. Phytoplankton populations are genotypically diverse, can become genetically differentiated within small spatiotemporal scales and many species form resting stages. Resting stage accumulations in sediments (seed banks) are expected to serve as reservoirs for genetic information, but so far their role in maintaining phytoplankton diversity and in evolution has remained unclear. In this study we used the toxic dinoflagellate Alexandrium ostenfeldii (Dinophyceae) as a model organism to investigate if (i) the benthic seed bank is more diverse than the pelagic population and (ii) the pelagic population is seasonally differentiated. Resting stages (benthic) and plankton (pelagic) samples were collected at a coastal bloom site in the Baltic Sea, followed by cell isolation and genotyping using microsatellite markers (MS) and restriction site associated DNA sequencing (RAD). High clonal diversity (98%–100%) combined with intermediate to low gene diversity (0.58–0.03, depending on the marker) was found. Surprisingly, the benthic and pelagic fractions of the population were equally diverse, and the pelagic fraction was temporally homogeneous, despite seasonal fluctuation of environmental selection pressures. The results of this study suggest that continuous benthic–pelagic coupling, combined with frequent sexual reproduction, as indicated by persistent linkage equilibrium, prevent the dominance of single clonal lineages in a dynamic environment. Both processes harmonize the pelagic with the benthic population and thus prevent seasonal population differentiation. At the same time, frequent sexual reproduction and benthic–pelagic coupling maintain high clonal diversity in both habitats.
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Affiliation(s)
- Jacqueline Jerney
- Tvärminne Zoological Station, University of Helsinki, Hanko, Finland.,Marine Research Center, Finnish Environment Institute, Helsinki, Finland
| | | | - Satoshi Nagai
- National Research Institute of Fisheries Science, Yokohama, Kanagawa, Japan
| | - Bernd Krock
- Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany
| | - Conny Sjöqvist
- Faculty of Science and Engineering, Environmental and Marine Biology, Åbo Akademi University, Turku, Finland
| | - Sanna Suikkanen
- Marine Research Center, Finnish Environment Institute, Helsinki, Finland
| | - Anke Kremp
- Marine Research Center, Finnish Environment Institute, Helsinki, Finland
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6
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Wood SM, Kremp A, Savela H, Akter S, Vartti VP, Saarni S, Suikkanen S. Cyanobacterial Akinete Distribution, Viability, and Cyanotoxin Records in Sediment Archives From the Northern Baltic Sea. Front Microbiol 2021; 12:681881. [PMID: 34211448 PMCID: PMC8241101 DOI: 10.3389/fmicb.2021.681881] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2021] [Accepted: 05/19/2021] [Indexed: 11/13/2022] Open
Abstract
Cyanobacteria of the order Nostocales, including Baltic Sea bloom-forming taxa Nodularia spumigena, Aphanizomenon flosaquae, and Dolichospermum spp., produce resting stages, known as akinetes, under unfavorable conditions. These akinetes can persist in the sediment and germinate if favorable conditions return, simultaneously representing past blooms and possibly contributing to future bloom formation. The present study characterized cyanobacterial akinete survival, germination, and potential cyanotoxin production in brackish water sediment archives from coastal and open Gulf of Finland in order to understand recent bloom expansion, akinete persistence, and cyanobacteria life cycles in the northern Baltic Sea. Results showed that cyanobacterial akinetes can persist in and germinate from Northern Baltic Sea sediment up to >40 and >400 years old, at coastal and open-sea locations, respectively. Akinete abundance and viability decreased with age and depth of vertical sediment layers. The detection of potential microcystin and nodularin production from akinetes was minimal and restricted to the surface sediment layers. Phylogenetic analysis of culturable cyanobacteria from the coastal sediment core indicated that most strains likely belonged to the benthic genus Anabaena. Potentially planktonic species of Dolichospermum could only be revived from the near-surface layers of the sediment, corresponding to an estimated age of 1–3 years. Results of germination experiments supported the notion that akinetes do not play an equally significant role in the life cycles of all bloom-forming cyanobacteria in the Baltic Sea. Overall, there was minimal congruence between akinete abundance, cyanotoxin concentration, and the presence of cyanotoxin biosynthetic genes in either sediment core. Further research is recommended to accurately detect and quantify akinetes and cyanotoxin genes from brackish water sediment samples in order to further describe species-specific benthic archives of cyanobacteria.
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Affiliation(s)
- Steffaney M Wood
- Marine Research Centre, Finnish Environment Institute, Helsinki, Finland
| | - Anke Kremp
- Leibniz Institute for Baltic Sea Research Warnemünde, Rostock, Germany
| | - Henna Savela
- Marine Research Centre, Finnish Environment Institute, Helsinki, Finland
| | - Sultana Akter
- Biotechnology, Department of Life Technologies, University of Turku, Turku, Finland
| | | | - Saija Saarni
- Department of Geography and Geology, University of Turku, Turku, Finland
| | - Sanna Suikkanen
- Marine Research Centre, Finnish Environment Institute, Helsinki, Finland
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7
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Alacid E, Reñé A, Gallisai R, Paloheimo A, Garcés E, Kremp A. Description of two new coexisting parasitoids of blooming dinoflagellates in the Baltic sea: Parvilucifera catillosa sp. nov. and Parvilucifera sp. (Perkinsea, Alveolata). Harmful Algae 2020; 100:101944. [PMID: 33298365 DOI: 10.1016/j.hal.2020.101944] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/16/2020] [Revised: 11/06/2020] [Accepted: 11/09/2020] [Indexed: 06/12/2023]
Abstract
Perkinsea are a group of intracellular protist parasites that inhabit all types of aquatic environments and cause significant population declines of a wide variety of hosts. However, the diversity of this lineage is mostly represented by environmental rDNA sequences. Complete descriptions of Perkinsea that infect marine dinoflagellates have increased in recent literature due to the identification, isolation and culturing of representatives during bloom events, contributing to expand the knowledge on the diversity and ecology of the group. Shallow coastal areas in the Baltic Sea suffer seasonal dinoflagellate blooms. In summer 2016, two parasitoids were isolated during a Kryptoperidinium foliaceum bloom in the Baltic Sea. Morphological features and sequences of the small and large subunit of the ribosomal DNA gene revealed these two parasitoids were new species that belong to the genus Parvilucifera. This is the first time that Parvilucifera infections are reported in the Inner Baltic Sea. The first species, Parvilucifera sp. has some morphological and phylogenetic features in common with P. sinerae and P. corolla, although its ultrastructure could not be studied and the formal description could not be done. The second new species, named Parvilucifera catillosa, has several distinct morphological features in its zoospores (e.g. the presence of a rostrum), and in the shape and size of the apertures in the sporangium stage, which are larger and more protuberant than in the other species of the genus. Infections observed in the field and cross-infection experiments determined that the host range of both Parvilucifera species was restricted to dinoflagellates, each one showing a different host preference. The coexistence in the same environment by the two closely related parasitoids with very similar life cycles suggests that their niche separation is the preferred host.
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Affiliation(s)
- Elisabet Alacid
- Departament de Biologia Marina i Oceanografia. Institut de Ciències del Mar (CSIC). Pg. Marítim de la Barceloneta, 37-49 08003 Barcelona, Catalonia, Spain; Department of Zoology, University of Oxford, 11a Mansfield Rd, Oxford, OX1 3SZ, United Kingdom.
| | - Albert Reñé
- Departament de Biologia Marina i Oceanografia. Institut de Ciències del Mar (CSIC). Pg. Marítim de la Barceloneta, 37-49 08003 Barcelona, Catalonia, Spain
| | - Rachele Gallisai
- Departament de Biologia Marina i Oceanografia. Institut de Ciències del Mar (CSIC). Pg. Marítim de la Barceloneta, 37-49 08003 Barcelona, Catalonia, Spain
| | - Aurora Paloheimo
- Finnish Environment Institute (SYKE), Marine Research Laboratory, Agnes Sjöbergin katu 2, 00790 Helsinki, Finland
| | - Esther Garcés
- Departament de Biologia Marina i Oceanografia. Institut de Ciències del Mar (CSIC). Pg. Marítim de la Barceloneta, 37-49 08003 Barcelona, Catalonia, Spain
| | - Anke Kremp
- Finnish Environment Institute (SYKE), Marine Research Laboratory, Agnes Sjöbergin katu 2, 00790 Helsinki, Finland; Leibniz Institute for Baltic Sea Research Warnemünde, Department of Biological Oceanography, Seestraße 15, 18119 Rostock, Germany
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8
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Mertens KN, Adachi M, Anderson DM, Band-Schmidt CJ, Bravo I, Brosnahan ML, Bolch CJS, Calado AJ, Carbonell-Moore MC, Chomérat N, Elbrächter M, Figueroa RI, Fraga S, Gárate-Lizárraga I, Garcés E, Gu H, Hallegraeff G, Hess P, Hoppenrath M, Horiguchi T, Iwataki M, John U, Kremp A, Larsen J, Leaw CP, Li Z, Lim PT, Litaker W, MacKenzie L, Masseret E, Matsuoka K, Moestrup Ø, Montresor M, Nagai S, Nézan E, Nishimura T, Okolodkov YB, Orlova TY, Reñé A, Sampedro N, Satta CT, Shin HH, Siano R, Smith KF, Steidinger K, Takano Y, Tillmann U, Wolny J, Yamaguchi A, Murray S. Morphological and phylogenetic data do not support the split of Alexandrium into four genera. Harmful Algae 2020; 98:101902. [PMID: 33129459 DOI: 10.1016/j.hal.2020.101902] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2020] [Revised: 09/02/2020] [Accepted: 09/09/2020] [Indexed: 06/11/2023]
Abstract
A recently published study analyzed the phylogenetic relationship between the genera Centrodinium and Alexandrium, confirming an earlier publication showing the genus Alexandrium as paraphyletic. This most recent manuscript retained the genus Alexandrium, introduced a new genus Episemicolon, resurrected two genera, Gessnerium and Protogonyaulax, and stated that: "The polyphyly [sic] of Alexandrium is solved with the split into four genera". However, these reintroduced taxa were not based on monophyletic groups. Therefore this work, if accepted, would result in replacing a single paraphyletic taxon with several non-monophyletic ones. The morphological data presented for genus characterization also do not convincingly support taxa delimitations. The combination of weak molecular phylogenetics and the lack of diagnostic traits (i.e., autapomorphies) render the applicability of the concept of limited use. The proposal to split the genus Alexandrium on the basis of our current knowledge is rejected herein. The aim here is not to present an alternative analysis and revision, but to maintain Alexandrium. A better constructed and more phylogenetically accurate revision can and should wait until more complete evidence becomes available and there is a strong reason to revise the genus Alexandrium. The reasons are explained in detail by a review of the available molecular and morphological data for species of the genera Alexandrium and Centrodinium. In addition, cyst morphology and chemotaxonomy are discussed, and the need for integrative taxonomy is highlighted.
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Affiliation(s)
- Kenneth Neil Mertens
- Ifremer, LER BO, Station de Biologie Marine, Place de la Croix, BP40537, F-29185 Concarneau Cedex, France.
| | - Masao Adachi
- Laboratory of Aquatic Environmental Science (LAQUES), Faculty of Agriculture and Marine Science, Kochi University, 200 Otsu, Monobe, Nankoku, Kochi 783-8502, Japan
| | | | - Christine J Band-Schmidt
- Departamento de Plancton y Ecología Marina, Instituto Politécnico Nacional, Centro Interdisciplinario de Ciencias Marinas (IPN-CICIMAR), La Paz, B.C.S. 23096, Mexico
| | - Isabel Bravo
- Instituto Español de Oceanografía (IEO), Subida a Radio Faro 50, 36390 Vigo, Spain
| | | | - Christopher J S Bolch
- Institute for Marine & Antarctic Studies, University of Tasmania, Locked Bag 1370, Launceston TAS 7250, Australia
| | - António J Calado
- Department of Biology and GeoBioTec Research Unit, University of Aveiro, P-3810-193 Aveiro, Portugal
| | - M Consuelo Carbonell-Moore
- Department of Botany and Plant Pathology, College of Agricultural Sciences, Oregon State University, Corvallis, OR 97331-2902, USA
| | - Nicolas Chomérat
- Ifremer, LER BO, Station de Biologie Marine, Place de la Croix, BP40537, F-29185 Concarneau Cedex, France
| | - Malte Elbrächter
- Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung Sylt, Hafenstr. 43, 25992 List/Sylt, Germany
| | - Rosa Isabel Figueroa
- Instituto Español de Oceanografía (IEO), Subida a Radio Faro 50, 36390 Vigo, Spain
| | | | - Ismael Gárate-Lizárraga
- Instituto Politécnico Nacional, Centro Interdisciplinario de Ciencias Marinas, Apartado Postal 592, Col. Centro, La Paz, B.C.S. 23000, Mexico
| | - Esther Garcés
- Departament de Biologia Marina i Oceanografía, Institut de Ciències del Mar, Consejo Superior de Investigaciones Científicas (CSIC), Pg. Marítim de la Barceloneta 37-49, 08003 Barcelona, Spain
| | - Haifeng Gu
- Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China
| | - Gustaaf Hallegraeff
- Institute for Marine and Antarctic Studies, University of Tasmania, Private Bag 129, Hobart, Tasmania 7001, Australia
| | - Philipp Hess
- Ifremer, DYNECO, Laboratoire Phycotoxines, Rue de l'Ile d'Yeu, 44311 Nantes, France
| | - Mona Hoppenrath
- Senckenberg am Meer, German Center for Marine Biodiversity Research, Wilhelmshaven, Germany
| | - Takeo Horiguchi
- Department of Biological Sciences, Faculty of Science, Hokkaido University, North 10, West 8, Sapporo 060-0810, Hokkaido, Japan
| | - Mitsunori Iwataki
- Asian Natural Environmental Science Center, The University of Tokyo, Bunkyo, Tokyo 113-8657, Japan
| | - Uwe John
- Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany
| | - Anke Kremp
- Leibniz Institut für Ostseeforschung Warnemünde, Seestr. 15, 18119 Rostock, Germany
| | - Jacob Larsen
- Marine Biological Section, Department of Biology, University of Copenhagen, Universitetsparken 4, DK-2100 Copenhagen Ø, Denmark
| | - Chui Pin Leaw
- Bachok Marine Research Station, Institute of Ocean and Earth Sciences, University of Malaya, 16310 Bachok, Kelantan, Malaysia
| | - Zhun Li
- Biological Resource Center/Korean Collection for Type Cultures (KCTC), Korea Research Institute of Bioscience and Biotechnology, Jeongeup 56212, Republic of Korea
| | - Po Teen Lim
- Bachok Marine Research Station, Institute of Ocean and Earth Sciences, University of Malaya, 16310 Bachok, Kelantan, Malaysia
| | - Wayne Litaker
- CSS Inc. Under contract to NOS/NOAA, Center for Coastal Fisheries and Habitat Research, 101 Pivers Island Road, Beaufort, NC 28516, USA
| | - Lincoln MacKenzie
- Coastal & Freshwater Group, Cawthron Institute, Private Bag 2, 98 Halifax Street East, Nelson 7042, New Zealand
| | - Estelle Masseret
- MARBEC, Université de Montpellier, CNRS, Ifremer, IRD, Montpellier, France
| | - Kazumi Matsuoka
- C/O Institute for East China Sea Research, Nagasaki University, 1551-7 Taira-machi, Nagasaki 851-2213, Japan
| | - Øjvind Moestrup
- Marine Biological Section, Department of Biology, University of Copenhagen, Universitetsparken 4, DK-2100 Copenhagen Ø, Denmark
| | - Marina Montresor
- Stazione Zoologica Anton Dohrn, Villa Comunale, 80121 Naples, Italy
| | - Satoshi Nagai
- National Research Institute of Fisheries Science, 2-12-4 Fukuura, Kanazawa-ku, Yokohama, Kanagawa 236-8648, Japan
| | - Elisabeth Nézan
- Ifremer, LER BO, Station de Biologie Marine, Place de la Croix, BP40537, F-29185 Concarneau Cedex, France; National Museum of Natural History, DGD-REVE, Station de Biologie Marine de Concarneau, Place de la Croix, 29900 Concarneau, France
| | - Tomohiro Nishimura
- Coastal & Freshwater Group, Cawthron Institute, Private Bag 2, 98 Halifax Street East, Nelson 7042, New Zealand
| | - Yuri B Okolodkov
- Universidad Veracruzana, Instituto de Ciencias Marinas y Pesquerías, Laboratorio de Botánica Marina y Planctología, Calle Mar Mediterráneo No. 314, Fracc. Costa Verde, C.P. 94294 Boca del Río, Veracruz, Mexico
| | - Tatiana Yu Orlova
- A.V. Zhirmunsky National Scientific Center of Marine Biology of the Far Eastern Branch of the Russian Academy of Sciences, Palchevskogo Street, 17, Vladivostok 690041, Russia
| | - Albert Reñé
- Departament de Biologia Marina i Oceanografía, Institut de Ciències del Mar, Consejo Superior de Investigaciones Científicas (CSIC), Pg. Marítim de la Barceloneta 37-49, 08003 Barcelona, Spain
| | - Nagore Sampedro
- Departament de Biologia Marina i Oceanografía, Institut de Ciències del Mar, Consejo Superior de Investigaciones Científicas (CSIC), Pg. Marítim de la Barceloneta 37-49, 08003 Barcelona, Spain
| | - Cecilia Teodora Satta
- Dipartimento di Architettura, Design e Urbanistica, University of Sassari, Via Piandanna 4, 07100 Sassari, Italy
| | - Hyeon Ho Shin
- Library of Marine Samples, Korea Institute of Ocean Science and Technology, Geoje, Republic of Korea
| | | | - Kirsty F Smith
- Coastal & Freshwater Group, Cawthron Institute, Private Bag 2, 98 Halifax Street East, Nelson 7042, New Zealand
| | - Karen Steidinger
- Florida Fish and Wildlife Conservation Commission Fish and Wildlife Research Institute, 100 8th Avenue SE St. Petersburg, FL 33701, USA
| | | | - Urban Tillmann
- Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany
| | - Jennifer Wolny
- Maryland Department of Natural Resources, 1919 Lincoln Drive Annapolis, MD 21401 USA
| | - Aika Yamaguchi
- Department of Biological Sciences, Faculty of Science, Hokkaido University, North 10, West 8, Sapporo 060-0810, Hokkaido, Japan
| | - Shauna Murray
- Climate Change Cluster, University of Technology Sydney, Ultimo, NSW 2007, Australia
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9
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Jerney J, Ahonen SA, Hakanen P, Suikkanen S, Kremp A. Generalist Life Cycle Aids Persistence of Alexandrium ostenfeldii (Dinophyceae) in Seasonal Coastal Habitats of the Baltic Sea. J Phycol 2019; 55:1226-1238. [PMID: 31520419 PMCID: PMC6916352 DOI: 10.1111/jpy.12919] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2019] [Accepted: 08/29/2019] [Indexed: 05/07/2023]
Abstract
In seasonal environments, strong gradients of environmental parameters can shape life cycles of phytoplankton. Depending on the rate of environmental fluctuation, specialist or generalist strategies may be favored, potentially affecting life cycle transitions. The present study examined life cycle transitions of the toxin producing Baltic dinoflagellate Alexandrium ostenfeldii and their regulation by environmental factors (temperature and nutrients). This investigation aimed to determine whether genetic recombination of different strains is required for resting cyst formation and whether newly formed cysts are dormant. Field data (temperature and salinity) and sediment surface samples were collected from a site with recurrent blooms and germination and encystment experiments were conducted under controlled laboratory conditions. Results indicate a lack of seasonal germination pattern, set by an endogenous rhythm, as commonly found with other dinoflagellates from the Baltic Sea. Germination of quiescent cysts was triggered by temperatures exceeding 10°C and combined nutrient limitation of nitrogen and phosphorus or a drop in temperature from 16 to 10°C triggered encystment most efficiently. Genetic recombination was not mandatory for the formation of resting cysts, but supported higher numbers of resistant cysts and enhanced germination capacity after a resting period. Findings from this study confirm that A. ostenfeldii follows a generalist germination and cyst formation strategy, driven by strong seasonality, which may support its persistence and possibly expansion in marginal environments in the future, if higher temperatures facilitate a longer growth season.
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Affiliation(s)
- Jacqueline Jerney
- Marine Research CenterFinnish Environment InstituteHelsinki00790Finland
- Tvärminne Zoological StationUniversity of HelsinkiHanko10900Finland
| | | | - Päivi Hakanen
- Marine Research CenterFinnish Environment InstituteHelsinki00790Finland
| | - Sanna Suikkanen
- Marine Research CenterFinnish Environment InstituteHelsinki00790Finland
| | - Anke Kremp
- Marine Research CenterFinnish Environment InstituteHelsinki00790Finland
- Leibniz‐Institut für Ostseeforschung WarnemündeRostock18119Germany
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10
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Kremp A, Hansen PJ, Tillmann U, Savela H, Suikkanen S, Voß D, Barrera F, Jakobsen HH, Krock B. Distributions of three Alexandrium species and their toxins across a salinity gradient suggest an increasing impact of GDA producing A. pseudogonyaulax in shallow brackish waters of Northern Europe. Harmful Algae 2019; 87:101622. [PMID: 31349884 DOI: 10.1016/j.hal.2019.101622] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2019] [Revised: 05/28/2019] [Accepted: 05/29/2019] [Indexed: 06/10/2023]
Abstract
Blooms of Alexandrium spp. are a well-known phenomenon in Northern European waters. While A. tamarense/catenella, and A. pseudogonyaulax have been reported from marine waters, high densities of A. ostenfeldii are mainly observed at lower salinities in North Sea estuaries and the Baltic Sea, suggesting salinity as a driver of Alexandrium species composition and toxin distribution. To investigate this relationship, an oceanographic expedition through a natural salinity gradient was conducted in June 2016 along the coasts of Denmark. Besides hydrographic data, phytoplankton and sediment samples were collected for analyses of Alexandrium spp. cell and cyst abundances, for toxin measurement and cell isolation. Plankton data revealed the predominance of A. pseudogonyaulax at all transect stations while A. ostenfeldii and A. catenella generally contributed a minor fraction to the Alexandrium community. High abundances of A. pseudogonyaulax in the shallow enclosed Limfjord were accompanied by high amounts of goniodomin A (GDA). This toxin was also detected at low abundances along with A. pseudogonyaulax in the North Sea and the Kattegat. Genetic and morphological characterization of established strains showed high similarity of the Northern European population to distant geographic populations. Despite low cell abundances of A. ostenfeldii, different profiles of cycloimines were measured in the North Sea and in the Limfjord. This field survey revealed that salinity alone does not determine Alexandrium species and toxin distribution, but emphasizes the importance of habitat conditions such as proximity to seed banks, shelter, and high nutrient concentrations. The results show that A. pseudogonyaulax has become a prominent member of the Alexandrium spp. community over the past decade in the study area. Analyses of long term monitoring data from the Limfjord confirmed a recent shift to A. pseudogonyaulax dominance. Cyst and toxin records of the species in Kiel Bight suggest a spreading potential into the brackish Baltic Sea, which might lead to an expansion of blooms under future climate conditions.
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Affiliation(s)
- Anke Kremp
- Leibniz Institut für Ostseeforschung Warnemünde, Seestr. 15, 18119 Rostock, Germany; Finnish Environment Institute, Marine Research Centre, Agnes Sjöbergin katu 2, 00790 Helsinki, Finland.
| | - Per Juel Hansen
- University of Copenhagen, Marine Biological Section, Strandpromenaden 5, 3000 Helsingør, Denmark
| | - Urban Tillmann
- Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Am Handelshafen 12, D-27570 Bremerhaven, Germany
| | - Henna Savela
- Finnish Environment Institute, Marine Research Centre, Agnes Sjöbergin katu 2, 00790 Helsinki, Finland; Department of Biochemistry/Biotechnology, University of Turku, Kiinamyllynkatu 10, 20520 Turku, Finland
| | - Sanna Suikkanen
- Finnish Environment Institute, Marine Research Centre, Agnes Sjöbergin katu 2, 00790 Helsinki, Finland
| | - Daniela Voß
- Institut für Chemie und Biologie des Meeres (ICBM), Schleusenstr. 1, 26382 Wilhelmshaven, Germany
| | - Facundo Barrera
- Departamento de Química Ambiental, Facultad de Ciencias. Centro de Investigación en Biodiversidad y Ambientes Sustentables. Universidad Católica de la Santísima Concepción. Alonso de Ribera 2850, 4090541, Concepción, Chile
| | - Hans Henrik Jakobsen
- University of Århus, Institute for Bioscience, Frederiksborgvej 399, 4000 Roskilde, Denmark
| | - Bernd Krock
- Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Am Handelshafen 12, D-27570 Bremerhaven, Germany
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11
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Sörenson E, Bertos‐Fortis M, Farnelid H, Kremp A, Krüger K, Lindehoff E, Legrand C. Consistency in microbiomes in cultures of Alexandrium species isolated from brackish and marine waters. Environ Microbiol Rep 2019; 11:425-433. [PMID: 30672139 PMCID: PMC6563467 DOI: 10.1111/1758-2229.12736] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/16/2018] [Revised: 01/15/2019] [Accepted: 01/20/2019] [Indexed: 06/09/2023]
Abstract
Phytoplankton and bacteria interactions have a significant role in aquatic ecosystem functioning. Associations can range from mutualistic to parasitic, shaping biogeochemical cycles and having a direct influence on phytoplankton growth. How variations in phenotype and sampling location, affect the phytoplankton microbiome is largely unknown. A high-resolution characterization of the bacterial community in cultures of the dinoflagellate Alexandrium was performed on strains isolated from different geographical locations and at varying anthropogenic impact levels. Microbiomes of Baltic Sea Alexandrium ostenfeldii isolates were dominated by Betaproteobacteria and were consistent over phenotypic and genotypic Alexandrium strain variation, resulting in identification of an A. ostenfeldii core microbiome. Comparisons with in situ bacterial communities showed that taxa found in this A. ostenfeldii core were specifically associated to dinoflagellate dynamics in the Baltic Sea. Microbiomes of Alexandrium tamarense and minutum, isolated from the Mediterranean Sea, differed from those of A. ostenfeldii in bacterial diversity and composition but displayed high consistency, and a core set of bacterial taxa was identified. This indicates that Alexandrium isolates with diverse phenotypes host predictable, species-specific, core microbiomes reflecting the abiotic conditions from which they were isolated. These findings enable in-depth studies of potential interactions occurring between Alexandrium and specific bacterial taxa.
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Affiliation(s)
- Eva Sörenson
- EEMiS, Department of Biology and Environmental Science, Linnaeus UniversityLinnæus University Centre of Ecology and Evolution in Microbial Model Systems39231, KalmarSweden
| | - Mireia Bertos‐Fortis
- EEMiS, Department of Biology and Environmental Science, Linnaeus UniversityLinnæus University Centre of Ecology and Evolution in Microbial Model Systems39231, KalmarSweden
| | - Hanna Farnelid
- EEMiS, Department of Biology and Environmental Science, Linnaeus UniversityLinnæus University Centre of Ecology and Evolution in Microbial Model Systems39231, KalmarSweden
| | - Anke Kremp
- Marine Research CentreFinnish Environment InstituteP.O. Box 140, 00251, HelsinkiFinland
- Leibniz Institute for Baltic Sea Research WarnemundeSeestrasse 15, 18119, RostockGermany
| | - Karen Krüger
- Max Planck Institute for Marine MicrobiologyCelsiusstraße 1, 28359, BremenGermany
| | - Elin Lindehoff
- EEMiS, Department of Biology and Environmental Science, Linnaeus UniversityLinnæus University Centre of Ecology and Evolution in Microbial Model Systems39231, KalmarSweden
- Marine Research CentreFinnish Environment InstituteP.O. Box 140, 00251, HelsinkiFinland
| | - Catherine Legrand
- EEMiS, Department of Biology and Environmental Science, Linnaeus UniversityLinnæus University Centre of Ecology and Evolution in Microbial Model Systems39231, KalmarSweden
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12
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13
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Sildever S, Jerney J, Kremp A, Oikawa H, Sakamoto S, Yamaguchi M, Baba K, Mori A, Fukui T, Nonomura T, Shinada A, Kuroda H, Kanno N, Mackenzie L, Anderson DM, Nagai S. Genetic relatedness of a new Japanese isolates of Alexandrium ostenfeldii bloom population with global isolates. Harmful Algae 2019; 84:64-74. [PMID: 31128814 PMCID: PMC6540814 DOI: 10.1016/j.hal.2019.02.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2018] [Revised: 01/12/2019] [Accepted: 02/02/2019] [Indexed: 05/13/2023]
Abstract
In recent years, blooms of toxic Alexandrium ostenfeldii strains have been reported from around the world. In 2013, the species formed a red tide in a shallow lagoon in western Japan, which was the first report of the species in the area. To investigate the genetic relatedness of Japanese A. ostenfeldii and global isolates, the full-length SSU, ITS and LSU sequences were determined, and phylogenetic analyses were conducted for isolates from western and northern Japan and from the Baltic Sea. Genotyping and microsatellite sequence comparison were performed to estimate the divergence and connectivity between the populations from western Japan and the Baltic Sea. In all phylogenetic analyses, the isolates from western Japan grouped together with global isolates from shallow and low saline areas, such as the Baltic Sea, estuaries on the east coast of U.S.A. and from the Bohai Sea, China. In contrast, the isolates from northern Japan formed a well-supported separate group in the ITS and LSU phylogenies, indicating differentiation between the Japanese populations. This was further supported by the notable differentiation between the sequences of western and northern Japanese isolates, whereas the lowest differentiation was found between the western Japanese and Chinese isolates. Microsatellite genotyping revealed low genetic diversity in the western Japanese population, possibly explained by a recent introduction to the lagoon from where it was detected. The red tide recorded in the shallow lagoon followed notable changes in the salinity of the waterbody and phytoplankton composition, potentially facilitating the bloom of A. ostenfeldii.
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Affiliation(s)
- Sirje Sildever
- National Research Institute of Fisheries Science, Yokohama, Kanagawa, 236-8648, Japan
| | - Jacqueline Jerney
- Finnish Environment Institute, Marine Research Centre, Agnes Sjöberginkatu 2, 00790 Helsinki, Finland
| | - Anke Kremp
- Finnish Environment Institute, Marine Research Centre, Agnes Sjöberginkatu 2, 00790 Helsinki, Finland
| | - Hiroshi Oikawa
- National Research Institute of Fisheries Science, Yokohama, Kanagawa, 236-8648, Japan
| | - Setsuko Sakamoto
- National Research Institute of Fisheries and Environment of Inland Sea, Hatsukaichi, Hiroshima, 739-0452, Japan
| | | | - Katsuhisa Baba
- Hokkaido Research Organization, Fisheries Research Department, Central Fisheries Research Institute, Yoichi, Hokkaido, 046-855, Japan
| | - Akihiro Mori
- Tottori Prefecture Water Environment Management Division, 1-220 Higashimachi, Tottori 680-8570, Japan
| | - Toshinori Fukui
- Tottori Prefectural Fisheries Research Center, 1166 Ishiwaki, Yurihama-cho, Tohaku-gun, Tottori Prefecture, 689-0602, Japan
| | - Takumi Nonomura
- Tottori Prefectural Fisheries Research Center, 1166 Ishiwaki, Yurihama-cho, Tohaku-gun, Tottori Prefecture, 689-0602, Japan
| | - Akiyoshi Shinada
- Central Fisheries Research Institute, 238 Hamanaka, Yoichi, Hokkaido, 046-8555, Japan
| | - Hiroshi Kuroda
- Hokkaido National Fisheries Research Institute, 116 Katsurakoi, Kushiro, Hokkaido, 085-0802, Japan
| | - Nanako Kanno
- National Research Institute of Fisheries Science, Yokohama, Kanagawa, 236-8648, Japan
| | - Lincoln Mackenzie
- Cawthron Institute, 98 Halifax Street East, Nelson 7010, New Zealand
| | - Donald M Anderson
- Woods Hole Oceanographic Institution, Woods Hole, MA, 02543-1050 USA
| | - Satoshi Nagai
- National Research Institute of Fisheries Science, Yokohama, Kanagawa, 236-8648, Japan.
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14
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Jerney J, Suikkanen S, Lindehoff E, Kremp A. Future temperature and salinity do not exert selection pressure on cyst germination of a toxic phytoplankton species. Ecol Evol 2019; 9:4443-4451. [PMID: 31031918 PMCID: PMC6476782 DOI: 10.1002/ece3.5009] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2018] [Revised: 01/30/2019] [Accepted: 02/05/2019] [Indexed: 11/10/2022] Open
Abstract
Environmental conditions regulate the germination of phytoplankton resting stages. While some factors lead to synchronous germination, others stimulate germination of only a small fraction of the resting stages. This suggests that habitat filters may act on the germination level and thus affect selection of blooming strains. Benthic "seed banks" of the toxic dinoflagellate Alexandrium ostenfeldii from the Baltic Sea are genetically and phenotypically diverse, indicating a high potential for adaptation by selection on standing genetic variation. Here, we experimentally tested the role of climate-related salinity and temperature as selection filters during germination and subsequent establishment of A. ostenfeldii strains. A representative resting cyst population was isolated from sediment samples, and germination and reciprocal transplantation experiments were carried out, including four treatments: Average present day germination conditions and three potential future conditions: high temperature, low salinity, and high temperature in combination with low salinity. We found that the final germination success of A. ostenfeldii resting cysts was unaffected by temperature and salinity in the range tested. A high germination success of more than 80% in all treatments indicates that strains are not selected by temperature and salinity during germination, but selection becomes more important shortly after germination, in the vegetative stage of the life cycle. Moreover, strains were not adapted to germination conditions. Instead, highly plastic responses occurred after transplantation and significantly higher growth rates were observed at higher temperature. High variability of strain-specific responses has probably masked the overall effect of the treatments, highlighting the importance of testing the effect of environmental factors on many strains. It is likely that A. ostenfeldii populations can persist in the future, because suitable strains, which are able to germinate and grow well at potential future climate conditions, are part of the highly diverse cyst population. OPEN RESEARCH BADGES This article has earned an Open Data Badge for making publicly available the digitally-shareable data necessary to reproduce the reported results. The data is available at https://doi.org/10.5061/dryad.c8c83nr.
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Affiliation(s)
- Jacqueline Jerney
- Marine Research CentreFinnish Environment InstituteHelsinkiFinland
- Tvärminne Zoological StationUniversity of HelsinkiHankoFinland
| | - Sanna Suikkanen
- Marine Research CentreFinnish Environment InstituteHelsinkiFinland
| | - Elin Lindehoff
- Marine Research CentreFinnish Environment InstituteHelsinkiFinland
- Department of Biology and Environmental Science, Linnaeus University Centre of Ecology and Evolution in Microbial Model Systems, EEMiSLinnaeus UniversityKalmarSweden
| | - Anke Kremp
- Marine Research CentreFinnish Environment InstituteHelsinkiFinland
- Leibniz‐Institut für Ostseeforschung WarnemündeRostockGermany
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15
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Brandenburg KM, Wohlrab S, John U, Kremp A, Jerney J, Krock B, Van de Waal DB. Intraspecific trait variation and trade-offs within and across populations of a toxic dinoflagellate. Ecol Lett 2018; 21:1561-1571. [DOI: 10.1111/ele.13138] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2018] [Revised: 05/01/2018] [Accepted: 07/12/2018] [Indexed: 01/31/2023]
Affiliation(s)
- Karen M. Brandenburg
- Department of Aquatic Ecology; Netherlands Institute of Ecology (NIOO-KNAW); Droevendaalsesteeg 10 6708 PB Wageningen The Netherlands
| | - Sylke Wohlrab
- Department of Ecological Chemistry; Alfred Wegener Institute (AWI); Helmholtz Centre for Polar and Marine Research; Am Handelshafen 12 27570 Bremerhaven Germany
- Helmholtz-Institut für Funktionelle Marine Biodiversität (HIFMB); Ammerländer Heerstraße 231 23129 Oldenburg Germany
| | - Uwe John
- Department of Ecological Chemistry; Alfred Wegener Institute (AWI); Helmholtz Centre for Polar and Marine Research; Am Handelshafen 12 27570 Bremerhaven Germany
- Helmholtz-Institut für Funktionelle Marine Biodiversität (HIFMB); Ammerländer Heerstraße 231 23129 Oldenburg Germany
| | - Anke Kremp
- SYKE Marine Research Laboratory; Agnes Sjöbergin katu 2 FI-00790 Helsinki Finland
| | - Jacqueline Jerney
- SYKE Marine Research Laboratory; Agnes Sjöbergin katu 2 FI-00790 Helsinki Finland
| | - Bernd Krock
- Department of Ecological Chemistry; Alfred Wegener Institute (AWI); Helmholtz Centre for Polar and Marine Research; Am Handelshafen 12 27570 Bremerhaven Germany
| | - Dedmer B. Van de Waal
- Department of Aquatic Ecology; Netherlands Institute of Ecology (NIOO-KNAW); Droevendaalsesteeg 10 6708 PB Wageningen The Netherlands
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16
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Tesson SVM, Weißbach A, Kremp A, Lindström Å, Rengefors K. The potential for dispersal of microalgal resting cysts by migratory birds. J Phycol 2018; 54:518-528. [PMID: 29889985 DOI: 10.1111/jpy.12756] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2018] [Accepted: 05/17/2018] [Indexed: 05/16/2023]
Abstract
Most microalgal species are geographically widespread, but little is known about how they are dispersed. One potential mechanism for long-distance dispersal is through birds, which may transport cells internally (endozoochory) and deposit them during, or in-between, their migratory stopovers. We hypothesize that dinoflagellates, in particular resting stages, can tolerate bird digestion; that bird temperature, acidity, and retention time negatively affect dinoflagellate viability; and that recovered cysts can germinate after passage through the birds' gut, contributing to species-specific dispersal of the dinoflagellates across scales. Tolerance of two dinoflagellate species (Peridiniopsis borgei, a warm-water species and Apocalathium malmogiense, a cold-water species) to Mallard gut passage was investigated using in vitro experiments simulating the gizzard and caeca conditions. The effect of in vitro digestion and retention time on cell integrity, cell viability, and germination capacity of the dinoflagellate species was examined targeting both their vegetative and resting stages. Resting stages (cysts) of both species were able to survive simulated bird gut passage, even if their survival rate and germination were negatively affected by exposure to acidic condition and bird internal temperature. Cysts of A. malmogiense were more sensitive than P. borgei to treatments and to the presence of digestive enzymes. Vegetative cells did not survive conditions of bird internal temperature and formed pellicle cysts when exposed to gizzard-like acid conditions. We show that dinoflagellate resting cysts serve as dispersal propagules through migratory birds. Assuming a retention time of viable cysts of 2-12 h to duck stomach conditions, cysts could be dispersed 150-800 km and beyond.
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Affiliation(s)
| | - Astrid Weißbach
- Department of Biology, Lund University, SE-22362, Lund, Sweden
| | - Anke Kremp
- Marine Research Centre, Finnish Environment Institute, FI-00560, Helsinki, Finland
| | - Åke Lindström
- Department of Biology, Lund University, SE-22362, Lund, Sweden
| | - Karin Rengefors
- Department of Biology, Lund University, SE-22362, Lund, Sweden
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17
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Annenkova NV, Ahrén D, Logares R, Kremp A, Rengefors K. Delineating closely related dinoflagellate lineages using phylotranscriptomics. J Phycol 2018; 54:571-576. [PMID: 29676790 DOI: 10.1111/jpy.12748] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2017] [Accepted: 04/05/2018] [Indexed: 06/08/2023]
Abstract
Recently radiated dinoflagellates Apocalathium aciculiferum (collected in Lake Erken, Sweden), Apocalathium malmogiense (Baltic Sea) and Apocalathium aff. malmogiense (Highway Lake, Antarctica) represent a lineage with an unresolved phylogeny. We determined their phylogenetic relationships using phylotranscriptomics based on 792 amino acid sequences. Our results showed that A. aciculiferum diverged from the other two closely related lineages, consistent with their different morphologies in cell size, relative cell length and presence of spines. We hypothesized that A. aff. malmogiense and A. malmogiense, which inhabit different hemispheres, are evolutionarily more closely related because they diverged from a marine common ancestor, adapting to a wide salinity range, while A. aciculiferum colonized a freshwater habitat, by acquiring adaptations to this environment, in particular, salinity intolerance. We show that phylotranscriptomics can resolve the phylogeny of recently diverged protists. This has broad relevance, given that many phytoplankton species are morphologically very similar, and single genes sometimes lack the information to determine species' relationships.
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Affiliation(s)
- Nataliia V Annenkova
- Limnological Institute Siberian Branch of the Russian Academy of Sciences 3, Ulan-Batorskaya St., 664033, Irkutsk, Russia
| | - Dag Ahrén
- Microbial Ecology Group, Department of Biology, Lund University, Ecology Building, SE-223 62, Lund, Sweden
- Bioinformatics Infrastructures for Life Sciences (BILS), Department of Biology, Lund University, Ecology Building, SE-223 62, Lund, Sweden
| | - Ramiro Logares
- Department of Marine Biology and Oceanography, Institute of Marine Science (ICM)-Consejo Superior de Investigaciones Científicas (CSIC), Passeig Marítim de la Barceloneta 37-49, E08003, Barcelona, Spain
| | - Anke Kremp
- Marine Research Centre, Finnish Environment Institute, Erik Palmenin aukio 1, 00560, Helsinki, Finland
| | - Karin Rengefors
- Aquatic Ecology, Department of Biology, Lund University, Ecology Building, SE-223 62, Lund, Sweden
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18
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Hinners J, Kremp A, Hense I. Evolution in temperature-dependent phytoplankton traits revealed from a sediment archive: do reaction norms tell the whole story? Proc Biol Sci 2018; 284:rspb.2017.1888. [PMID: 29021182 DOI: 10.1098/rspb.2017.1888] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2017] [Accepted: 09/08/2017] [Indexed: 01/18/2023] Open
Abstract
The high evolutionary potential of phytoplankton species allows them to rapidly adapt to global warming. Adaptations may occur in temperature-dependent traits, such as growth rate, cell size and life cycle processes. Using resurrection experiments with resting stages from living sediment archives, it is possible to investigate whether adaptation occurred. For this study, we revived resting cysts of the spring bloom dinoflagellate Apocalathium malmogiense from recent and 100-year-old sediment layers from the Gulf of Finland, and compared temperature-dependent traits of recent and historic strains along a temperature gradient. We detected no changes in growth rates and cell sizes but a significant difference between recent and historic strains regarding resting cyst formation. The encystment rate of recent strains was significantly lower compared with historic strains which we interpret as an indication of adaptation to higher and more rapidly increasing spring temperatures. Low encystment rates may allow for bloom formation even if the threshold temperature inducing a loss of actively growing cells through resting cyst formation is exceeded. Our findings reveal that phenotypic responses of phytoplankton to changing temperature conditions may include hidden traits such as life cycle processes and their regulation mechanisms. This study emphasizes the potential of living sediment archives to investigate plankton responses and adaptation to global warming.
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Affiliation(s)
- Jana Hinners
- Institute for Hydrobiology and Fisheries Science, Center for Earth System Research and Sustainability, University of Hamburg, Große Elbstraße 133, 22767 Hamburg, Germany
| | - Anke Kremp
- Marine Research Centre, Finnish Environment Institute (SYKE), Erik Palménin aukio 1, 00560 Helsinki, Finland
| | - Inga Hense
- Institute for Hydrobiology and Fisheries Science, Center for Earth System Research and Sustainability, University of Hamburg, Große Elbstraße 133, 22767 Hamburg, Germany
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19
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Sefbom J, Kremp A, Rengefors K, Jonsson PR, Sjöqvist C, Godhe A. A planktonic diatom displays genetic structure over small spatial scales. Environ Microbiol 2018; 20:2783-2795. [PMID: 29614214 DOI: 10.1111/1462-2920.14117] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2016] [Accepted: 03/22/2018] [Indexed: 11/30/2022]
Abstract
Marine planktonic microalgae have potentially global dispersal, yet reduced gene flow has been confirmed repeatedly for several species. Over larger distances (>200 km) geographic isolation and restricted oceanographic connectivity have been recognized as instrumental in driving population divergence. Here we investigated whether similar patterns, that is, structured populations governed by geographic isolation and/or oceanographic connectivity, can be observed at smaller (6-152 km) geographic scales. To test this we established 425 clonal cultures of the planktonic diatom Skeletonema marinoi collected from 11 locations in the Archipelago Sea (northern Baltic Sea). The region is characterized by a complex topography, entailing several mixing regions of which four were included in the sampling area. Using eight microsatellite markers and conventional F-statistics, significant genetic differentiation was observed between several sites. Moreover, Bayesian cluster analysis revealed the co-occurrence of two genetic groups spread throughout the area. However, geographic isolation and oceanographic connectivity could not explain the genetic patterns observed. Our data reveal hierarchical genetic structuring whereby despite high dispersal potential, significantly diverged populations have developed over small spatial scales. Our results suggest that biological characteristics and historical events may be more important in generating barriers to gene flow than physical barriers at small spatial scales.
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Affiliation(s)
- Josefin Sefbom
- Department of Marine Sciences, University of Gothenburg, Gothenberg, Sweden
| | - Anke Kremp
- Marine Research Centre, Finnish Environment Institute (SYKE), Helsinki, Finland
| | - Karin Rengefors
- Aquatic Ecology, Department of Biology, Lund University, Lund, Sweden
| | - Per R Jonsson
- Department of Marine Sciences-Tjärnö, University of Gothenburg, Gothenberg, Sweden
| | - Conny Sjöqvist
- Marine Research Centre, Finnish Environment Institute (SYKE), Helsinki, Finland.,Environmental and Marine Biology, Åbo Akademi University, Åbo, Finland
| | - Anna Godhe
- Department of Marine Sciences, University of Gothenburg, Gothenberg, Sweden
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20
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Mäki A, Salmi P, Mikkonen A, Kremp A, Tiirola M. Sample Preservation, DNA or RNA Extraction and Data Analysis for High-Throughput Phytoplankton Community Sequencing. Front Microbiol 2017; 8:1848. [PMID: 29018424 PMCID: PMC5622927 DOI: 10.3389/fmicb.2017.01848] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2017] [Accepted: 09/11/2017] [Indexed: 12/14/2022] Open
Abstract
Phytoplankton is the basis for aquatic food webs and mirrors the water quality. Conventionally, phytoplankton analysis has been done using time consuming and partly subjective microscopic observations, but next generation sequencing (NGS) technologies provide promising potential for rapid automated examination of environmental samples. Because many phytoplankton species have tough cell walls, methods for cell lysis and DNA or RNA isolation need to be efficient to allow unbiased nucleic acid retrieval. Here, we analyzed how two phytoplankton preservation methods, three commercial DNA extraction kits and their improvements, three RNA extraction methods, and two data analysis procedures affected the results of the NGS analysis. A mock community was pooled from phytoplankton species with variation in nucleus size and cell wall hardness. Although the study showed potential for studying Lugol-preserved sample collections, it demonstrated critical challenges in the DNA-based phytoplankton analysis in overall. The 18S rRNA gene sequencing output was highly affected by the variation in the rRNA gene copy numbers per cell, while sample preservation and nucleic acid extraction methods formed another source of variation. At the top, sequence-specific variation in the data quality introduced unexpected bioinformatics bias when the sliding-window method was used for the quality trimming of the Ion Torrent data. While DNA-based analyses did not correlate with biomasses or cell numbers of the mock community, rRNA-based analyses were less affected by different RNA extraction procedures and had better match with the biomasses, dry weight and carbon contents, and are therefore recommended for quantitative phytoplankton analyses.
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Affiliation(s)
- Anita Mäki
- Department of Biological and Environmental Science, University of Jyväskylä, Jyväskylä, Finland
| | - Pauliina Salmi
- Department of Biological and Environmental Science, University of Jyväskylä, Jyväskylä, Finland
| | - Anu Mikkonen
- Department of Biological and Environmental Science, University of Jyväskylä, Jyväskylä, Finland
| | - Anke Kremp
- Marine Research Centre, Finnish Environment Institute, Helsinki, Finland
| | - Marja Tiirola
- Department of Biological and Environmental Science, University of Jyväskylä, Jyväskylä, Finland
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21
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Bunse C, Bertos-Fortis M, Sassenhagen I, Sildever S, Sjöqvist C, Godhe A, Gross S, Kremp A, Lips I, Lundholm N, Rengefors K, Sefbom J, Pinhassi J, Legrand C. Spatio-Temporal Interdependence of Bacteria and Phytoplankton during a Baltic Sea Spring Bloom. Front Microbiol 2016; 7:517. [PMID: 27148206 PMCID: PMC4838809 DOI: 10.3389/fmicb.2016.00517] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2016] [Accepted: 03/29/2016] [Indexed: 11/13/2022] Open
Abstract
In temperate systems, phytoplankton spring blooms deplete inorganic nutrients and are major sources of organic matter for the microbial loop. In response to phytoplankton exudates and environmental factors, heterotrophic microbial communities are highly dynamic and change their abundance and composition both on spatial and temporal scales. Yet, most of our understanding about these processes comes from laboratory model organism studies, mesocosm experiments or single temporal transects. Spatial-temporal studies examining interactions of phytoplankton blooms and bacterioplankton community composition and function, though being highly informative, are scarce. In this study, pelagic microbial community dynamics (bacteria and phytoplankton) and environmental variables were monitored during a spring bloom across the Baltic Proper (two cruises between North Germany to Gulf of Finland). To test to what extent bacterioplankton community composition relates to the spring bloom, we used next generation amplicon sequencing of the 16S rRNA gene, phytoplankton diversity analysis based on microscopy counts and population genotyping of the dominating diatom Skeletonema marinoi. Several phytoplankton bloom related and environmental variables were identified to influence bacterial community composition. Members of Bacteroidetes and Alphaproteobacteria dominated the bacterial community composition but the bacterial groups showed no apparent correlation with direct bloom related variables. The less abundant bacterial phyla Actinobacteria, Planctomycetes, and Verrucomicrobia, on the other hand, were strongly associated with phytoplankton biomass, diatom:dinoflagellate ratio, and colored dissolved organic matter (cDOM). Many bacterial operational taxonomic units (OTUs) showed high niche specificities. For example, particular Bacteroidetes OTUs were associated with two distinct genetic clusters of S. marinoi. Our study revealed the complexity of interactions of bacterial taxa with inter- and intraspecific genetic variation in phytoplankton. Overall, our findings imply that biotic and abiotic factors during spring bloom influence bacterial community dynamics in a hierarchical manner.
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Affiliation(s)
- Carina Bunse
- Centre for Ecology and Evolution in Microbial Model Systems - EEMiS, Linnaeus University Kalmar, Sweden
| | - Mireia Bertos-Fortis
- Centre for Ecology and Evolution in Microbial Model Systems - EEMiS, Linnaeus University Kalmar, Sweden
| | | | - Sirje Sildever
- Marine Systems Institute, Tallinn University of Technology Tallinn, Estonia
| | - Conny Sjöqvist
- Finnish Environmental Institute/Marine Research CentreHelsinki, Finland; Environmental and Marine Biology, Åbo Akademi UniversityÅbo, Finland
| | - Anna Godhe
- Department of Marine Sciences, University of Gothenburg Gothenburg, Sweden
| | - Susanna Gross
- Department of Marine Sciences, University of Gothenburg Gothenburg, Sweden
| | - Anke Kremp
- Finnish Environmental Institute/Marine Research Centre Helsinki, Finland
| | - Inga Lips
- Marine Systems Institute, Tallinn University of Technology Tallinn, Estonia
| | - Nina Lundholm
- Natural History Museum of Denmark, University of Copenhagen Copenhagen, Denmark
| | | | - Josefin Sefbom
- Department of Marine Sciences, University of Gothenburg Gothenburg, Sweden
| | - Jarone Pinhassi
- Centre for Ecology and Evolution in Microbial Model Systems - EEMiS, Linnaeus University Kalmar, Sweden
| | - Catherine Legrand
- Centre for Ecology and Evolution in Microbial Model Systems - EEMiS, Linnaeus University Kalmar, Sweden
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Savela H, Harju K, Spoof L, Lindehoff E, Meriluoto J, Vehniäinen M, Kremp A. Quantity of the dinoflagellate sxtA4 gene and cell density correlates with paralytic shellfish toxin production in Alexandrium ostenfeldii blooms. Harmful Algae 2016; 52:1-10. [PMID: 28073466 DOI: 10.1016/j.hal.2015.10.018] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2015] [Revised: 10/29/2015] [Accepted: 10/29/2015] [Indexed: 06/06/2023]
Abstract
Many marine dinoflagellates, including several species of the genus Alexandrium, Gymnodinium catenatum, and Pyrodinium bahamense are known for their capability to produce paralytic shellfish toxins (PST), which can cause severe, most often food-related poisoning. The recent discovery of the first PST biosynthesis genes has laid the foundation for the development of molecular detection methods for monitoring and study of PST-producing dinoflagellates. In this study, a probe-based qPCR method for the detection and quantification of the sxtA4 gene present in Alexandrium spp. and Gymnodinium catenatum was designed. The focus was on Alexandrium ostenfeldii, a species which recurrently forms dense toxic blooms in areas within the Baltic Sea. A consistent, positive correlation between the presence of sxtA4 and PST biosynthesis was observed, and the species was found to maintain PST production with an average of 6 genomic copies of sxtA4. In August 2014, A. ostenfeldii populations were studied for cell densities, PST production, as well as sxtA4 and species-specific LSU copy numbers in Föglö, Åland, Finland, where an exceptionally dense bloom, consisting of 6.3×106cellsL-1, was observed. Cell concentrations, and copy numbers of both of the target genes were positively correlated with total STX, GTX2, and GTX3 concentrations in the environment, the cell density predicting toxin concentrations with the best accuracy (Spearman's ρ=0.93, p<0.01). The results indicated that all A. ostenfeldii cells in the blooms harbored the genetic capability of PST production, making the detection of sxtA4 a good indicator of toxicity.
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Affiliation(s)
- Henna Savela
- Biotechnology, Department of Biochemistry, University of Turku, Tykistökatu 6 A 6th Floor, FI-20520 Turku, Finland.
| | - Kirsi Harju
- VERIFIN - Finnish Institute for Verification of the Chemical Weapons Convention, Department of Chemistry, P.O. Box 55, FI-00014 University of Helsinki, Finland
| | - Lisa Spoof
- Biochemistry, Faculty of Natural Science and Engineering, Åbo Akademi University, Tykistökatu 6A 3rd Floor, FI-20520 Turku, Finland
| | - Elin Lindehoff
- Ecology and Evolution in Microbial model System (EEMiS), Department of Biology and Environmental Science (BoM), Linnæus University, Kalmar 39182, Sweden
| | - Jussi Meriluoto
- Biochemistry, Faculty of Natural Science and Engineering, Åbo Akademi University, Tykistökatu 6A 3rd Floor, FI-20520 Turku, Finland
| | - Markus Vehniäinen
- Biotechnology, Department of Biochemistry, University of Turku, Tykistökatu 6 A 6th Floor, FI-20520 Turku, Finland
| | - Anke Kremp
- Marine Research Centre, Finnish Environment Institute, Erik Palménin aukio 1, FI-00560 Helsinki, Finland
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23
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Kremp A, Oja J, LeTortorec AH, Hakanen P, Tahvanainen P, Tuimala J, Suikkanen S. Diverse seed banks favour adaptation of microalgal populations to future climate conditions. Environ Microbiol 2015; 18:679-91. [PMID: 26913820 DOI: 10.1111/1462-2920.13070] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2015] [Accepted: 09/25/2015] [Indexed: 02/02/2023]
Abstract
Selection of suitable genotypes from diverse seed banks may help phytoplankton populations to cope with environmental changes. This study examines whether the high genotypic diversity found in the Baltic cyst pool of the toxic dinoflagellate Alexandrium ostenfeldii is coupled to phenotypic variability that could aid short-term adaptation. Growth rates, cellular toxicities and bioluminescence of 34 genetically different clones isolated from cyst beds of four Baltic bloom sites were determined in batch culture experiments along temperature and salinity gradients covering present and future conditions in the Baltic Sea. For all parameters a significant effect of genotype on the response to temperature and salinity changes was identified. General or site-specific effects of the two factors remained minor. Clones thriving at future conditions were different from the best performing at present conditions, suggesting that genotypic shifts may be expected in the future. Increased proportions of highly potent saxitoxin were observed as a plastic response to temperature increase, indicating a potential for higher toxicity of future blooms. The observed standing variation in Baltic seed banks of A. ostenfeldii suggests that the population is likely to persist under environmental change.
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Affiliation(s)
- Anke Kremp
- Marine Research Centre, Finnish Environment Institute, 00251, Helsinki, Finland
| | - Johanna Oja
- Marine Research Centre, Finnish Environment Institute, 00251, Helsinki, Finland
| | - Anniina H LeTortorec
- Marine Research Centre, Finnish Environment Institute, 00251, Helsinki, Finland.,Tvärminne Zoological Station, University of Helsinki, 10900, Hanko, Finland
| | - Päivi Hakanen
- Marine Research Centre, Finnish Environment Institute, 00251, Helsinki, Finland
| | - Pia Tahvanainen
- Marine Research Centre, Finnish Environment Institute, 00251, Helsinki, Finland.,Tvärminne Zoological Station, University of Helsinki, 10900, Hanko, Finland
| | - Jarno Tuimala
- Finnish Tax Administration, Haapaniemenkatu 4, 00052, Vero, Finland
| | - Sanna Suikkanen
- Marine Research Centre, Finnish Environment Institute, 00251, Helsinki, Finland
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24
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Salgado P, Vázquez JA, Riobó P, Franco JM, Figueroa RI, Kremp A, Bravo I. A Kinetic and Factorial Approach to Study the Effects of Temperature and Salinity on Growth and Toxin Production by the Dinoflagellate Alexandrium ostenfeldii from the Baltic Sea. PLoS One 2015; 10:e0143021. [PMID: 26636674 PMCID: PMC4670228 DOI: 10.1371/journal.pone.0143021] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2015] [Accepted: 10/29/2015] [Indexed: 11/18/2022] Open
Abstract
Alexandrium ostenfeldii is present in a wide variety of environments in coastal areas worldwide and is the only dinoflagellate known species that produces paralytic shellfish poisoning (PSP) toxins and two types of cyclic imines, spirolides (SPXs) and gymnodimines (GYMs). The increasing frequency of A. ostenfeldii blooms in the Baltic Sea has been attributed to the warming water in this region. To learn more about the optimal environmental conditions favoring the proliferation of A. ostenfeldii and its complex toxicity, the effects of temperature and salinity on the kinetics of both the growth and the net toxin production of this species were examined using a factorial design and a response-surface analysis (RSA). The results showed that the growth of Baltic A. ostenfeldii occurs over a wide range of temperatures and salinities (12.5-25.5°C and 5-21, respectively), with optimal growth conditions achieved at a temperature of 25.5°C and a salinity of 11.2. Together with the finding that a salinity > 21 was the only growth-limiting factor detected for this strain, this study provides important insights into the autecology and population distribution of this species in the Baltic Sea. The presence of PSP toxins, including gonyautoxin (GTX)-3, GTX-2, and saxitoxin (STX), and GYMs (GYM-A and GYM-B/-C analogues) was detected under all temperature and salinity conditions tested and in the majority of the cases was concomitant with both the exponential growth and stationary phases of the dinoflagellate's growth cycle. Toxin concentrations were maximal at temperatures and salinities of 20.9°C and 17 for the GYM-A analogue and > 19°C and 15 for PSP toxins, respectively. The ecological implications of the optimal conditions for growth and toxin production of A. ostenfeldii in the Baltic Sea are discussed.
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Affiliation(s)
- Pablo Salgado
- Departamento de Medio Ambiente, División de Investigación en Acuicultura, Instituto de Fomento Pesquero (IFOP), Punta Arenas, Chile
- Centro Oceanográfico de Vigo, Instituto Español de Oceanografía (IEO), Vigo, Spain
| | - José A. Vázquez
- Grupo de Reciclado y Valorización de Materiales Residuales (REVAL), Instituto de Investigaciones Marinas (IIM-CSIC), Vigo, Spain
| | - Pilar Riobó
- Instituto de Investigaciones Marinas (IIM-CSIC), Vigo, Spain
| | - José M. Franco
- Instituto de Investigaciones Marinas (IIM-CSIC), Vigo, Spain
| | - Rosa I. Figueroa
- Centro Oceanográfico de Vigo, Instituto Español de Oceanografía (IEO), Vigo, Spain
| | - Anke Kremp
- Marine Research Centre, Finnish Environment Institute (SYKE), Helsinki, Finland
| | - Isabel Bravo
- Centro Oceanográfico de Vigo, Instituto Español de Oceanografía (IEO), Vigo, Spain
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25
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Rodríguez F, Garrido JL, Sobrino C, Johnsen G, Riobó P, Franco J, Aamot I, Ramilo I, Sanz N, Kremp A. Divinyl chlorophyll a in the marine eukaryotic protist Alexandrium ostenfeldii (Dinophyceae). Environ Microbiol 2015; 18:627-43. [PMID: 26337730 DOI: 10.1111/1462-2920.13042] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2015] [Revised: 08/26/2015] [Accepted: 08/27/2015] [Indexed: 02/01/2023]
Abstract
Here it is reported the first detection of DV-chl a together with the usual chl a in the marine dinoflagellate Alexandrium ostenfeldii from the Baltic Sea. Growth response and photosynthetic parameters were examined at two irradiances (80 and 240 μmol photons m(-2) s(-1)) and temperatures (15 °C and 19 °C) in a divinylic strain (AOTV-OS20) versus a monovinylic one (AOTV-OS16), using in vivo chl a fluorescence kinetics of PSII to characterize photosynthetic parameters by pulse amplitude modulated fluorescence, (14)C assimilation rates and toxin analyses. The divinylic isolate exhibited slower growth and stronger sensitivity to high irradiance than normal chl a strain. DV-chl a : chl a ratios decreased along time (from 11.3 to < 0.5 after 10 months) and to restore them sub-cloning and selection of strains with highest DV-chl a content was required. A mutation and/or epigenetic changes in the expression of divinyl reductase gene/s in A. ostenfeldii may explain this altered pigment composition. Despite quite severe limitations (reduced fitness and gradual loss of DV-chl a content), the DV-chl a-containing line in A. ostenfeldii could provide a model organism in photosynthetic studies related with chl biosynthesis and evolution.
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Affiliation(s)
- Francisco Rodríguez
- Instituto Español de Oceanografía (IEO), Centro Oceanográfico de Vigo, Spain
| | | | - Cristina Sobrino
- Departamento de Ecología y Biología Animal, Universidad de Vigo, Spain
| | - Geir Johnsen
- Trondhjem Biological Station, Norwegian University of Technology and Science (NTNU), Trondheim, Norway
| | - Pilar Riobó
- Instituto de Investigaciones Marinas (CSIC), Vigo, Spain
| | - José Franco
- Instituto de Investigaciones Marinas (CSIC), Vigo, Spain
| | - Inga Aamot
- Trondhjem Biological Station, Norwegian University of Technology and Science (NTNU), Trondheim, Norway
| | - Isabel Ramilo
- Instituto Español de Oceanografía (IEO), Centro Oceanográfico de Vigo, Spain
| | - Noelia Sanz
- Instituto de Investigaciones Marinas (CSIC), Vigo, Spain
| | - Anke Kremp
- Marine Research Centre, Finnish Environment Institute, Helsinki, Finland
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Sjöqvist C, Godhe A, Jonsson PR, Sundqvist L, Kremp A. Local adaptation and oceanographic connectivity patterns explain genetic differentiation of a marine diatom across the North Sea-Baltic Sea salinity gradient. Mol Ecol 2015; 24:2871-85. [PMID: 25892181 PMCID: PMC4692096 DOI: 10.1111/mec.13208] [Citation(s) in RCA: 56] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2014] [Revised: 04/13/2015] [Accepted: 04/16/2015] [Indexed: 01/22/2023]
Abstract
Drivers of population genetic structure are still poorly understood in marine micro-organisms. We exploited the North Sea-Baltic Sea transition for investigating the seascape genetics of a marine diatom, Skeletonema marinoi. Eight polymorphic microsatellite loci were analysed in 354 individuals from ten locations to analyse population structure of the species along a 1500-km-long salinity gradient ranging from 3 to 30 psu. To test for salinity adaptation, salinity reaction norms were determined for sets of strains originating from three different salinity regimes of the gradient. Modelled oceanographic connectivity was compared to directional relative migration by correlation analyses to examine oceanographic drivers. Population genetic analyses showed distinct genetic divergence of a low-salinity Baltic Sea population and a high-salinity North Sea population, coinciding with the most evident physical dispersal barrier in the area, the Danish Straits. Baltic Sea populations displayed reduced genetic diversity compared to North Sea populations. Growth optima of low salinity isolates were significantly lower than those of strains from higher native salinities, indicating local salinity adaptation. Although the North Sea-Baltic Sea transition was identified as a barrier to gene flow, migration between Baltic Sea and North Sea populations occurred. However, the presence of differentiated neutral markers on each side of the transition zone suggests that migrants are maladapted. It is concluded that local salinity adaptation, supported by oceanographic connectivity patterns creating an asymmetric migration pattern between the Baltic Sea and the North Sea, determines genetic differentiation patterns in the transition zone.
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Affiliation(s)
- C Sjöqvist
- Environmental and Marine Biology, Åbo Akademi University, Artillerigatan 6, 20520, Åbo, Finland.,Finnish Environmental Institute/Marine Research Centre, PB 140, 00251, Helsinki, Finland
| | - A Godhe
- Department of Biological and Environmental Sciences, University of Gothenburg, PB 461, SE 40530, Göteborg, Sweden
| | - P R Jonsson
- Department of Biological and Environmental Sciences - Tjärnö, University of Gothenburg, SE 45296, Strömstad, Sweden
| | - L Sundqvist
- Department of Biological and Environmental Sciences, University of Gothenburg, PB 461, SE 40530, Göteborg, Sweden
| | - A Kremp
- Finnish Environmental Institute/Marine Research Centre, PB 140, 00251, Helsinki, Finland
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27
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Mertens KN, Takano Y, Yamaguchi A, Gu H, Bogus K, Kremp A, Bagheri S, Matishov G, Matsuoka K. The molecular characterization of the enigmatic dinoflagellateKolkwitziella acutareveals an affinity to theExcentricasection of the genusProtoperidinium. SYST BIODIVERS 2015. [DOI: 10.1080/14772000.2015.1078855] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Kopf A, Bicak M, Kottmann R, Schnetzer J, Kostadinov I, Lehmann K, Fernandez-Guerra A, Jeanthon C, Rahav E, Ullrich M, Wichels A, Gerdts G, Polymenakou P, Kotoulas G, Siam R, Abdallah RZ, Sonnenschein EC, Cariou T, O'Gara F, Jackson S, Orlic S, Steinke M, Busch J, Duarte B, Caçador I, Canning-Clode J, Bobrova O, Marteinsson V, Reynisson E, Loureiro CM, Luna GM, Quero GM, Löscher CR, Kremp A, DeLorenzo ME, Øvreås L, Tolman J, LaRoche J, Penna A, Frischer M, Davis T, Katherine B, Meyer CP, Ramos S, Magalhães C, Jude-Lemeilleur F, Aguirre-Macedo ML, Wang S, Poulton N, Jones S, Collin R, Fuhrman JA, Conan P, Alonso C, Stambler N, Goodwin K, Yakimov MM, Baltar F, Bodrossy L, Van De Kamp J, Frampton DM, Ostrowski M, Van Ruth P, Malthouse P, Claus S, Deneudt K, Mortelmans J, Pitois S, Wallom D, Salter I, Costa R, Schroeder DC, Kandil MM, Amaral V, Biancalana F, Santana R, Pedrotti ML, Yoshida T, Ogata H, Ingleton T, Munnik K, Rodriguez-Ezpeleta N, Berteaux-Lecellier V, Wecker P, Cancio I, Vaulot D, Bienhold C, Ghazal H, Chaouni B, Essayeh S, Ettamimi S, Zaid EH, Boukhatem N, Bouali A, Chahboune R, Barrijal S, Timinouni M, El Otmani F, Bennani M, Mea M, Todorova N, Karamfilov V, Ten Hoopen P, Cochrane G, L'Haridon S, Bizsel KC, Vezzi A, Lauro FM, Martin P, Jensen RM, Hinks J, Gebbels S, Rosselli R, De Pascale F, Schiavon R, Dos Santos A, Villar E, Pesant S, Cataletto B, Malfatti F, Edirisinghe R, Silveira JAH, Barbier M, Turk V, Tinta T, Fuller WJ, Salihoglu I, Serakinci N, Ergoren MC, Bresnan E, Iriberri J, Nyhus PAF, Bente E, Karlsen HE, Golyshin PN, Gasol JM, Moncheva S, Dzhembekova N, Johnson Z, Sinigalliano CD, Gidley ML, Zingone A, Danovaro R, Tsiamis G, Clark MS, Costa AC, El Bour M, Martins AM, Collins RE, Ducluzeau AL, Martinez J, Costello MJ, Amaral-Zettler LA, Gilbert JA, Davies N, Field D, Glöckner FO. The ocean sampling day consortium. Gigascience 2015; 4:27. [PMID: 26097697 PMCID: PMC4473829 DOI: 10.1186/s13742-015-0066-5] [Citation(s) in RCA: 135] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2015] [Accepted: 05/06/2015] [Indexed: 11/26/2022] Open
Abstract
Ocean Sampling Day was initiated by the EU-funded Micro B3 (Marine Microbial Biodiversity, Bioinformatics, Biotechnology) project to obtain a snapshot of the marine microbial biodiversity and function of the world’s oceans. It is a simultaneous global mega-sequencing campaign aiming to generate the largest standardized microbial data set in a single day. This will be achievable only through the coordinated efforts of an Ocean Sampling Day Consortium, supportive partnerships and networks between sites. This commentary outlines the establishment, function and aims of the Consortium and describes our vision for a sustainable study of marine microbial communities and their embedded functional traits.
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Affiliation(s)
- Anna Kopf
- Max Planck Institute for Marine Microbiology, Celsiusstrasse 1, D-28359 Bremen, Germany ; Jacobs University Bremen gGmbH, Campus Ring 1, D-28759 Bremen, Germany
| | - Mesude Bicak
- University of Oxford, 7 Keble Road, OX1 3QG Oxford, Oxfordshire UK
| | - Renzo Kottmann
- Max Planck Institute for Marine Microbiology, Celsiusstrasse 1, D-28359 Bremen, Germany
| | - Julia Schnetzer
- Max Planck Institute for Marine Microbiology, Celsiusstrasse 1, D-28359 Bremen, Germany ; Jacobs University Bremen gGmbH, Campus Ring 1, D-28759 Bremen, Germany
| | - Ivaylo Kostadinov
- Jacobs University Bremen gGmbH, Campus Ring 1, D-28759 Bremen, Germany
| | - Katja Lehmann
- Centre for Ecology & Hydrology, MacLean Building, Benson Lane, Crowmarsh Gifford, OX10 8BB Wallingford, Oxfordshire UK
| | - Antonio Fernandez-Guerra
- Max Planck Institute for Marine Microbiology, Celsiusstrasse 1, D-28359 Bremen, Germany ; University of Oxford, 7 Keble Road, OX1 3QG Oxford, Oxfordshire UK
| | - Christian Jeanthon
- CNRS & Sorbonne Universités, UPMC Univ Paris 06, Station Biologique, Place Georges Teissier, F-29680 Roscoff, France
| | - Eyal Rahav
- Israel Oceanographic and Limnological Research, National Institute of Oceanography, Tel- Shikmona, POB 8030, 31080 Haifa, Israel
| | - Matthias Ullrich
- Jacobs University Bremen gGmbH, Campus Ring 1, D-28759 Bremen, Germany
| | - Antje Wichels
- Alfred Wegener Institute, Biologische Anstalt Helgoland, Kurpromenade 201, 27498 Helgoland, Germany
| | - Gunnar Gerdts
- Alfred Wegener Institute, Biologische Anstalt Helgoland, Kurpromenade 201, 27498 Helgoland, Germany
| | - Paraskevi Polymenakou
- Hellenic Centre for Marine Research, Institute of Marine Biology, Biotechnology and Aquaculture, Gournes Pediados, 71500 Heraklion, Crete Greece
| | - Giorgos Kotoulas
- Hellenic Centre for Marine Research, Institute of Marine Biology, Biotechnology and Aquaculture, Gournes Pediados, 71500 Heraklion, Crete Greece
| | - Rania Siam
- Biology Department and YJ-Science and Technology Research Center, American University in Cairo, New Cairo, 11835 Cairo Governorate Egypt
| | - Rehab Z Abdallah
- Biology Department and YJ-Science and Technology Research Center, American University in Cairo, New Cairo, 11835 Cairo Governorate Egypt
| | - Eva C Sonnenschein
- Department of Systems Biology, Technical University of Denmark, Matematiktorvet 301, 2800 Kgs., Lyngby, Denmark
| | - Thierry Cariou
- CNRS & Sorbonne Universités, UPMC Univ Paris 06, Station Biologique, Place Georges Teissier, F-29680 Roscoff, France
| | - Fergal O'Gara
- National University of Ireland-University College Cork, Cork, Ireland ; Curtin University, Biomedical Sciences, Perth, Western Australia Australia
| | - Stephen Jackson
- Department of Systems Biology, Technical University of Denmark, Matematiktorvet 301, 2800 Kgs., Lyngby, Denmark
| | - Sandi Orlic
- Ruđer Bošković Institute, Bijenička cesta 54, 10 000, Zagreb, Croatia
| | - Michael Steinke
- School of Biological Sciences, University of Essex, CO4 3SQ Colchester, Essex UK
| | - Julia Busch
- Institute for Chemistry and Biology of the Marine Environment (ICBM), Carl von Ossietzky University Oldenburg, Schleusenstrasse 1, 26383 Wilhemshaven, Germany
| | - Bernardo Duarte
- Marine and Environmental Sciences Centre, Faculty of Sciences of the University of Lisbon, Campo Grande 1749-016, Lisbon, Portugal
| | - Isabel Caçador
- Marine and Environmental Sciences Centre, Faculty of Sciences of the University of Lisbon, Campo Grande 1749-016, Lisbon, Portugal
| | - João Canning-Clode
- Marine and Environmental Sciences Centre, Faculty of Sciences of the University of Lisbon, Campo Grande 1749-016, Lisbon, Portugal ; Smithsonian Environmental Research Center, 21037 Edgewater, Maryland USA
| | - Oleksandra Bobrova
- Department of Microbiology, Virology and Biotechnology, Odessa National II Mechnikov University, Dvoryanskaya str.2, 65082 Odessa, Ukraine
| | | | | | - Clara Magalhães Loureiro
- InBio/CIBIO, Departamento de Biologia da Universidade dos Açores, 9501-801 Ponta Delgada, Portugal
| | - Gian Marco Luna
- National Research Council, Institute of Marine Sciences (CNR-ISMAR), Castello 2737/f, Arsenale Tesa 104, 30122 Venezia, Italy
| | - Grazia Marina Quero
- National Research Council, Institute of Marine Sciences (CNR-ISMAR), Castello 2737/f, Arsenale Tesa 104, 30122 Venezia, Italy
| | - Carolin R Löscher
- Institute of Microbiology/ GEOMAR, Am Botanischen Garten 1-9, 24118 Kiel, Germany
| | - Anke Kremp
- Marine Research Centre, Finnish Environment Institute, Erik Palmenin aukio 1, 00560 Helsinki, Finland
| | - Marie E DeLorenzo
- NOAA/National Ocean Service/NCCOS/Center for Coastal Environmental Health & Biomolecular Research Charleston, 29412 South Carolina, USA
| | - Lise Øvreås
- Department of Biology, University of Bergen, Thormøhlensgate 53B, 5020 Bergen, Norway
| | - Jennifer Tolman
- LaRoche Research Group, Department of Biology, Dalhousie University, B3H 4R2 Halifax, Nova Scotia Canada
| | - Julie LaRoche
- LaRoche Research Group, Department of Biology, Dalhousie University, B3H 4R2 Halifax, Nova Scotia Canada
| | - Antonella Penna
- Department of Biomolecular Sciences, University of Urbino, Viale Trieste 296, 61121 Pesaro, Italy
| | - Marc Frischer
- University of Georgia's Skidaway Institute of Oceanography, 10 Ocean Science Circle, 31411 Savannah, Georgia USA
| | - Timothy Davis
- NOAA-Great Lakes Environmental Research Laboratory, 4840 S State Road, 48108 Ann Arbor, Michigan USA
| | - Barker Katherine
- National Museum of Natural History, Smithsonian Institution, 10th and Constitution Avenue NW, 20013 Washington, DC USA
| | - Christopher P Meyer
- National Museum of Natural History, Smithsonian Institution, 10th and Constitution Avenue NW, 20013 Washington, DC USA
| | - Sandra Ramos
- CIIMAR, Interdisciplinary Center of Environmental and Marine Research, University of Porto, Rua dos Bragas 289, 4050-123 Porto, Portugal
| | - Catarina Magalhães
- CIIMAR, Interdisciplinary Center of Environmental and Marine Research, University of Porto, Rua dos Bragas 289, 4050-123 Porto, Portugal
| | - Florence Jude-Lemeilleur
- Station Marine d'Arcachon, CNRS & Univ Bordeaux, 2 rue Professeur Jolyet, F-33120 Arcachon, France
| | - Ma Leopoldina Aguirre-Macedo
- Centro de Investigación y de Estudios Avanzados (CINVESTAV), Unidad Mérida, Carretera Antigua a Progreso Km 6 Cordemex, C.P., 97310 Yucatan, Mexico
| | - Shiao Wang
- Department of Biological Sciences, University of Southern Mississippi, 39406 Hattiesburg, Mississippi USA
| | - Nicole Poulton
- Bigelow Laboratory for Ocean Sciences, 60 Bigelow Drive, 04544 East Boothbay, Maine USA
| | - Scott Jones
- Smithsonian Marine Station, 701 Seaway Drive, 34949 Fort Pierce, Florida USA
| | - Rachel Collin
- Smithsonian Tropical Research Institute, Apartado Postal 0843-03092, Balboa Ancon, Panama
| | - Jed A Fuhrman
- Wrigley Institute for Environmental Studies and Department of Biological Sciences, University of Southern California, 90089-0371 Los Angeles, California USA
| | - Pascal Conan
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, UMR7621, Laboratoire d'Océanographie Microbienne, Observatoire Océanologique, F-66651 Banyuls sur Mer, France
| | - Cecilia Alonso
- Microbial Ecology of Aquatic Transitional Systems Research Group, Centro Universitario de la Región Este, Universidad de la República, Ruta 15, km 28.500, Rocha, Uruguay
| | - Noga Stambler
- The Mina and Everard Goodman Faculty of Life Sciences, Bar-Ilan University, 5290002 Ramat-Gan, Israel ; Interuniversity Institute for Marine Sciences in Eilat, 88103 Eilat, Israel
| | - Kelly Goodwin
- NOAA Atlantic Oceanographic and Meteorological Laboratory, Ocean Chemistry and Ecosystems Division, 4301 Rickenbacker Causeway, 33149 Miami, Florida USA
| | - Michael M Yakimov
- Institute for Coastal Marine Environment, IAMC-CNR, Spianata S Raineri, 86 - 98122, Messina, Sicily Italy
| | - Federico Baltar
- Department of Marine Science, University of Otago, PO Box 56, 9054 Dunedin, New Zealand
| | - Levente Bodrossy
- CSIRO Oceans and Atmosphere Flagship, 7000 Hobart, Tasmania Australia
| | - Jodie Van De Kamp
- CSIRO Oceans and Atmosphere Flagship, 7000 Hobart, Tasmania Australia
| | - Dion Mf Frampton
- CSIRO Oceans and Atmosphere Flagship, 7000 Hobart, Tasmania Australia
| | - Martin Ostrowski
- Department of Chemistry and Biomolecular Science, Macquarie University, 2109 Sydney, Australia
| | - Paul Van Ruth
- South Australian Research and Development Institute (SARDI) - Aquatic Sciences, PO Box 120, 5022 Henley Beach, South Australia Australia
| | - Paul Malthouse
- South Australian Research and Development Institute (SARDI) - Aquatic Sciences, PO Box 120, 5022 Henley Beach, South Australia Australia
| | - Simon Claus
- Flanders Marine Institute, InnovOcean site, Wandelaarkaai 7, 8400 Oostende, Belgium
| | - Klaas Deneudt
- Flanders Marine Institute, InnovOcean site, Wandelaarkaai 7, 8400 Oostende, Belgium
| | - Jonas Mortelmans
- Flanders Marine Institute, InnovOcean site, Wandelaarkaai 7, 8400 Oostende, Belgium
| | - Sophie Pitois
- Centre for Environment, Fisheries and Aquaculture Science (CEFAS), Pakefield Road, NR33 0HT Lowestoft, Suffolk UK
| | - David Wallom
- University of Oxford, 7 Keble Road, OX1 3QG Oxford, Oxfordshire UK
| | - Ian Salter
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, UMR7621, Laboratoire d'Océanographie Microbienne, Observatoire Océanologique, F-66651 Banyuls sur Mer, France ; Alfred-Wegener-Institut-Helmholtz-Zentrum für Polar-und Meeresforschung, Am Handelshafen 12, 27570 Bremerhaven, Germany
| | - Rodrigo Costa
- Microbial Ecology and Evolution Research Group, Centre of Marine Sciences, Algarve University, Gambelas Campus, Building 7, Room 2.77, 8005-139 Faro, Portugal
| | - Declan C Schroeder
- Marine Biological Association of the UK, Citadel Hill, PL1 2PB Plymouth, Devon UK
| | - Mahrous M Kandil
- Soil and Water Science Department, Faculty of Agriculture, Alexandria University, El-Shatbi, 21545 Alexandria, Egypt
| | - Valentina Amaral
- Microbial Ecology of Aquatic Transitional Systems Research Group, Centro Universitario de la Región Este, Universidad de la República, Ruta 15, km 28.500, Rocha, Uruguay
| | - Florencia Biancalana
- Marine Biogeochemistry - Argentine Institute of Oceanography, Camino La Carrindanga Km 7,5, 8000 Florida, Bahia Blanca Argentina
| | - Rafael Santana
- Microbial Ecology of Aquatic Transitional Systems Research Group, Centro Universitario de la Región Este, Universidad de la República, Ruta 15, km 28.500, Rocha, Uruguay
| | - Maria Luiza Pedrotti
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, UMR 7093, LOV, Observatoire océanologique, F-Villefranche-sur-Mer, Paris, France
| | - Takashi Yoshida
- Graduate School of Agriculture, Kyoto University, 606-8502 Sakyo-ku, Kyoto Japan
| | - Hiroyuki Ogata
- Graduate School of Agriculture, Kyoto University, 606-8502 Sakyo-ku, Kyoto Japan
| | - Tim Ingleton
- Waters, Wetlands and Coasts, New South Wales Office of Environment and Heritage, Sydney South 1232, 59-61 Goulburn Street, 2001 PO Box A290, Sydney, New South Wales Australia ; Antarctic and Southern Ocean Studies, University of Tasmania, 7004 Hobart, Tasmania Australia
| | - Kate Munnik
- Lwandle Technologies, Black River Park, Fir Road, 7925 Observatory, Cape Town South Africa
| | | | | | - Patricia Wecker
- CRIOBE, USR3278 CNRS-EPHE-UPVD, LabEx Corail, BP 1013-98729 Papetoai Moorea, French Polynesia
| | - Ibon Cancio
- University of the Basque Country, PO Box 644, E-48080 Bilbao, Basque Country Spain
| | - Daniel Vaulot
- CNRS & Sorbonne Universités, UPMC Univ Paris 06, Station Biologique, Place Georges Teissier, F-29680 Roscoff, France
| | - Christina Bienhold
- Max Planck Institute for Marine Microbiology, Celsiusstrasse 1, D-28359 Bremen, Germany ; Alfred-Wegener-Institut-Helmholtz-Zentrum für Polar-und Meeresforschung, Am Handelshafen 12, 27570 Bremerhaven, Germany
| | - Hassan Ghazal
- Polydisciplinary Faculty of Nador, University Mohammed Premier, Selouane, Nador Morocco ; Laboratory of Genetics and Biotechnology, University Mohammed Premier, Oujda, Morocco
| | - Bouchra Chaouni
- Laboratory of Genetics and Biotechnology, University Mohammed Premier, Oujda, Morocco ; Faculty of Sciences of Rabat, University Mohammed Fifth Rabat, Rabat, Morocco
| | - Soumya Essayeh
- Polydisciplinary Faculty of Nador, University Mohammed Premier, Selouane, Nador Morocco
| | - Sara Ettamimi
- Laboratory of Genetics and Biotechnology, University Mohammed Premier, Oujda, Morocco ; Polydisciplinary Faculty of Taza, University Sidi Mohammed Ben Abdallah, Fes, Morocco
| | - El Houcine Zaid
- Faculty of Sciences of Rabat, University Mohammed Fifth Rabat, Rabat, Morocco
| | - Noureddine Boukhatem
- Laboratory of Genetics and Biotechnology, University Mohammed Premier, Oujda, Morocco
| | - Abderrahim Bouali
- Laboratory of Genetics and Biotechnology, University Mohammed Premier, Oujda, Morocco
| | - Rajaa Chahboune
- Polydisciplinary Faculty of Nador, University Mohammed Premier, Selouane, Nador Morocco ; Faculté des Sciences et Techniques de Tanger, Université Abdelmalek Essaâdi, Tanger, Morocco
| | - Said Barrijal
- Faculté des Sciences et Techniques de Tanger, Université Abdelmalek Essaâdi, Tanger, Morocco
| | - Mohammed Timinouni
- Pasteur Institute of Morocco, 1 Place Louis Pasteur, 20100 Casablanca, Morocco
| | - Fatima El Otmani
- Microbiology, Health and Environment Team, Department of Biology, Faculty of Sciences, Chouaib Doukkali University, Rte Ben Maachou, BP 20 Avenue des Facultés, El Jadida, Morocco
| | - Mohamed Bennani
- Pasteur Institute of Morocco, 1 Place Louis Pasteur, 20100 Casablanca, Morocco
| | - Marianna Mea
- Jacobs University Bremen gGmbH, Campus Ring 1, D-28759 Bremen, Germany
| | - Nadezhda Todorova
- Institute of Biodiversity and Ecosystem Research (IBER), Bulgarian Academy of Sciences, 2 Gagarin Street, 1113 Sofia, Bulgaria
| | - Ventzislav Karamfilov
- Institute of Biodiversity and Ecosystem Research (IBER), Bulgarian Academy of Sciences, 2 Gagarin Street, 1113 Sofia, Bulgaria
| | - Petra Ten Hoopen
- European Molecular Biology Laboratory, European Bioinformatics Institute (EMBL-EBI), Wellcome Trust Genome Campus, Hinxton, CB10 1SD Cambridge, Cambridgeshire UK
| | - Guy Cochrane
- European Molecular Biology Laboratory, European Bioinformatics Institute (EMBL-EBI), Wellcome Trust Genome Campus, Hinxton, CB10 1SD Cambridge, Cambridgeshire UK
| | - Stephane L'Haridon
- Université de Bretagne Occidentale (UBO, UEB), Institut Universitaire Européen de la Mer (IUEM), Place Nicolas Copernic, F-29280 Plouzané, France
| | - Kemal Can Bizsel
- Dokuz Eylul University (DEU), Institute of Marine Sciences and Technology (IMST), Baku Bulvard, No: 100, Inciralti, 35340 Izmir, Balcova Turkey
| | - Alessandro Vezzi
- Department of Biology, University of Padova, Via Ugo Bassi 58/B, 35121 Padova, Italy
| | - Federico M Lauro
- Singapore Centre for Environmental Life Sciences Engineering, 60 Nanyang Drive, SBS 01N-27, 637551 Singapore, Singapore
| | - Patrick Martin
- Earth Observatory of Singapore, Nanyang Technological University, 50 Nanyang Avenue, 639798 Singapore, Singapore
| | - Rachelle M Jensen
- Indigo V Expeditions, ONE°15 Marina, #01-01, 11 Cove Drive, Sentosa Cove, 098497 Singapore, Singapore
| | - Jamie Hinks
- Singapore Centre for Environmental Life Sciences Engineering, 60 Nanyang Drive, SBS 01N-27, 637551 Singapore, Singapore
| | - Susan Gebbels
- School of Marine Science and Technology, Newcastle University, Dove Marine Laboratory, Cullercoats, NE30 4PZ Tyne and Wear UK
| | - Riccardo Rosselli
- Department of Biology, University of Padova, Via Ugo Bassi 58/B, 35121 Padova, Italy
| | - Fabio De Pascale
- Department of Biology, University of Padova, Via Ugo Bassi 58/B, 35121 Padova, Italy
| | - Riccardo Schiavon
- Department of Biology, University of Padova, Via Ugo Bassi 58/B, 35121 Padova, Italy
| | - Antonina Dos Santos
- IPMA, Department of Sea and Marine Resources, Avenida de Brasília, s/n, 1449-006 Lisboa, Portugal
| | - Emilie Villar
- Aix Marseille Université, CNRS, IGS UMR 7256, 163 Avenue de Luminy, 13288 Marseille, France
| | - Stéphane Pesant
- PANGAEA - Data Publisher for Earth & Environmental Science, MARUM Center for Marine Environmental Sciences, University Bremen, Hochschulring 18, 28359 Bremen, Germany
| | - Bruno Cataletto
- OGS, National Institute of Oceanography and Experimental Geophysics, Via Auguste Piccard, 54, 34151, Santa Croce, Trieste, Italy
| | - Francesca Malfatti
- OGS, National Institute of Oceanography and Experimental Geophysics, Via Auguste Piccard, 54, 34151, Santa Croce, Trieste, Italy
| | - Ranjith Edirisinghe
- Department of Physical Sciences, Faculty of Applied Sciences, Rajarata University of Sri Lanka, Mihintale, Sri Lanka
| | - Jorge A Herrera Silveira
- Department of Biological Sciences, University of Southern Mississippi, 39406 Hattiesburg, Mississippi USA
| | - Michele Barbier
- Mediterranean Science Commission, 16 Bd de Suisse, 98 000 Monaco, Monaco
| | - Valentina Turk
- Marine Biology Station, National Institute of Biology, Fornače 41, 6330 Piran, Slovenia
| | - Tinkara Tinta
- Marine Biology Station, National Institute of Biology, Fornače 41, 6330 Piran, Slovenia
| | - Wayne J Fuller
- Near East University, TRNC Mersin 10, 99138 Nicosia, Northern Cyprus
| | - Ilkay Salihoglu
- Near East University, TRNC Mersin 10, 99138 Nicosia, Northern Cyprus
| | - Nedime Serakinci
- Near East University, TRNC Mersin 10, 99138 Nicosia, Northern Cyprus
| | | | - Eileen Bresnan
- Phytoplankton Ecology, Marine Scotland Marine Laboratory, 375 Victoria Road, AB11 9DB Aberdeen, Aberdeenshire UK
| | - Juan Iriberri
- University of the Basque Country, PO Box 644, E-48080 Bilbao, Basque Country Spain
| | | | - Edvardsen Bente
- Section for Aquatic Biology and Toxicology, Department of Biosciences, University of Oslo, PO Box 1066, 0316 Blindern, Oslo Norway
| | - Hans Erik Karlsen
- Drøbak Field Station, Marine Biology Research station, Biologiveien 2, 1440 Drøbak, Norway
| | - Peter N Golyshin
- School of Biological Sciences, College of Natural Sciences, Bangor University, LL57 2UW Gwynedd, Bangor UK
| | - Josep M Gasol
- Departament de Biologia Marina i Oceanografia, Institut de Ciències del Mar-CSIC, Pg Marítim de la Barceloneta 37-49, E08003 Barcelona, Catalunya Spain
| | - Snejana Moncheva
- Fridtjof Nansen Institute of Oceanology, First May Street 40, 9000 Varna, Bulgaria
| | - Nina Dzhembekova
- Fridtjof Nansen Institute of Oceanology, First May Street 40, 9000 Varna, Bulgaria
| | - Zackary Johnson
- Nicholas School of the Environment and Biology Department, Duke University, 135 Marine Lab Road, 28516 Beaufort, North Carolina USA
| | - Christopher David Sinigalliano
- NOAA Atlantic Oceanographic and Meteorological Laboratory, Ocean Chemistry and Ecosystems Division, 4301 Rickenbacker Causeway, 33149 Miami, Florida USA
| | - Maribeth Louise Gidley
- NOAA Atlantic Oceanographic and Meteorological Laboratory, Ocean Chemistry and Ecosystems Division, 4301 Rickenbacker Causeway, 33149 Miami, Florida USA ; Cooperative Institute of Marine and Atmospheric Sciences, Rosenstiel School of Marine & Atmospheric Science, University of Miami, 4600 Rickenbacker Causeway, 33149 Miami, Florida USA
| | - Adriana Zingone
- Stazione Zoologica Anton Dohrn, Villa Comunale, 80121 Napoli, Italy
| | - Roberto Danovaro
- Stazione Zoologica Anton Dohrn, Villa Comunale, 80121 Napoli, Italy ; Department of Life and Environmental Sciences, Polytechnic University of Marche, Via Brecce Bianche, 60131 Ancona, Italy
| | - George Tsiamis
- Department of Environmental and Natural Resources Management, University of Patras, 2 Seferi Street, 301 00 Agrinio, Greece
| | - Melody S Clark
- British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, CB3 0ET Cambridge, Cambridgeshire UK
| | - Ana Cristina Costa
- InBio/CIBIO, Departamento de Biologia da Universidade dos Açores, 9501-801 Ponta Delgada, Portugal
| | - Monia El Bour
- Institut National des Sciences et Technologies de la Mer (INSTM), 28 rue du 2 mars 1934, 2025 Salammbô, Tunisia
| | - Ana M Martins
- InBio/CIBIO, Departamento de Biologia da Universidade dos Açores, 9501-801 Ponta Delgada, Portugal ; Department of Oceanography and Fisheries, University of the Azores, PT-9901-862 Horta, Portugal
| | - R Eric Collins
- University of Alaska Fairbanks, Box 757220, 99775 Fairbanks, Alaska USA
| | | | - Jonathan Martinez
- University of Hawaii at Manoa, Kewalo Marine Laboratory, 41 Ahui St., Honolulu, 96813 Hawaii, USA
| | - Mark J Costello
- Institute of Marine Science, University of Auckland, Private Bag 92019, Auckland, 1142 New Zealand
| | - Linda A Amaral-Zettler
- Marine Biological Laboratory, 7 MBL Street, Woods Hole, 02543 Massachusetts, USA ; Department of Earth, Environmental, and Planetary Sciences, Brown University, 02912 Providence, Rhode Island USA
| | - Jack A Gilbert
- College of Environmental and Resource Sciences, Zhejiang University, 310058 Hangzhou, China ; Institute for Genomic and Systems Biology, Bioscience Division, Argonne National Laboratory, 9700 South Cass Avenue, 60439 Argonne, Illinois USA ; University of Chicago, 1101 E 57th Street, 60637 Chicago, Illinois USA ; Marine Biological Laboratory, 7 MBL Street, Woods Hole, 02543 Massachusetts, USA
| | - Neil Davies
- Jacobs University Bremen gGmbH, Campus Ring 1, D-28759 Bremen, Germany ; Gump South Pacific Research Station, University of California Berkeley, BP 244 98728 Moorea, French Polynesia
| | - Dawn Field
- Jacobs University Bremen gGmbH, Campus Ring 1, D-28759 Bremen, Germany ; University of Oxford, 7 Keble Road, OX1 3QG Oxford, Oxfordshire UK
| | - Frank Oliver Glöckner
- Max Planck Institute for Marine Microbiology, Celsiusstrasse 1, D-28359 Bremen, Germany ; Jacobs University Bremen gGmbH, Campus Ring 1, D-28759 Bremen, Germany
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Godhe A, Kremp A, Montresor M. Genetic and Microscopic Evidence for Sexual Reproduction in the Centric Diatom Skeletonema marinoi. Protist 2014; 165:401-16. [DOI: 10.1016/j.protis.2014.04.006] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2013] [Revised: 04/14/2014] [Accepted: 04/18/2014] [Indexed: 01/23/2023]
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Majaneva M, Remonen I, Rintala JM, Belevich I, Kremp A, Setälä O, Jokitalo E, Blomster J. Rhinomonas nottbecki n. sp. (cryptomonadales) and molecular phylogeny of the family Pyrenomonadaceae. J Eukaryot Microbiol 2014; 61:480-92. [PMID: 24913840 DOI: 10.1111/jeu.12128] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2013] [Revised: 03/09/2014] [Accepted: 03/14/2014] [Indexed: 11/30/2022]
Abstract
The cryptomonad Rhinomonas nottbecki n. sp., isolated from the Baltic Sea, is described from live and fixed cells studied by light, scanning, and transmission electron microscopy together with sequences of the partial nucleus- and nucleomorph-encoded 18S rRNA genes as well as the nucleus-encoded ITS1, 5.8S, ITS2, and the 5'-end of the 28S rRNA gene regions. The sequence analyses include comparison with 43 strains from the family Pyrenomonadaceae. Rhinomonas nottbecki cells are dorsoventrally flattened, obloid in shape; 10.0-17.2 μm long, 5.5-8.1 μm thick, and 4.4-8.8 μm wide. The inner periplast has roughly hexagonal plates. Rhinomonas nottbecki cells resemble those of Rhinomonas reticulata, but the nucleomorph 18S rRNA gene of R. nottbecki differs by 2% from that of R. reticulata, while the ITS region by 11%. The intraspecific variability in the ITS region of R. nottbecki is 5%. In addition, the predicted ITS2 secondary structures are different in R. nottbecki and R. reticulata. The family Pyrenomonadaceae includes three clades: Clade A, Clade B, and Clade C. All Rhinomonas sequences branched within the Clade C, while the genus Rhodomonas is paraphyletic. The analyses suggest that the genus Storeatula is an alternating morphotype of the genera Rhinomonas and Rhodomonas and that the family Pyrenomonadaceae includes some species that were described multiple times, as well as novel species.
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Affiliation(s)
- Markus Majaneva
- Tvärminne Zoological Station, University of Helsinki, Hanko, 10900, Finland; Marine Centre, Finnish Environment Institute, Helsinki, 00560, Finland; Department of Environmental Sciences, University of Helsinki, Helsinki, 00014, Finland
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Kremp A, Tahvanainen P, Litaker W, Krock B, Suikkanen S, Leaw CP, Tomas C. Phylogenetic relationships, morphological variation, and toxin patterns in the Alexandrium ostenfeldii (Dinophyceae) complex: implications for species boundaries and identities. J Phycol 2014; 50:81-100. [PMID: 26988010 DOI: 10.1111/jpy.12134] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2013] [Accepted: 09/03/2013] [Indexed: 05/16/2023]
Abstract
Alexandrium ostenfeldii (Paulsen) Balech and Tangen and A. peruvianum (Balech and B.R. Mendiola) Balech and Tangen are morphologically closely related dinoflagellates known to produce potent neurotoxins. Together with Gonyaulax dimorpha Biecheler, they constitute the A. ostenfeldii species complex. Due to the subtle differences in the morphological characters used to differentiate these species, unambiguous species identification has proven problematic. To better understand the species boundaries within the A. ostenfeldii complex we compared rDNA data, morphometric characters and toxin profiles of multiple cultured isolates from different geographic regions. Phylogenetic analysis of rDNA sequences from cultures characterized as A. ostenfeldii or A. peruvianum formed a monophyletic clade consisting of six distinct groups. Each group examined contained strains morphologically identified as either A. ostenfeldii or A. peruvianum. Though key morphological characters were generally found to be highly variable and not consistently distributed, selected plate features and toxin profiles differed significantly among phylogenetic clusters. Additional sequence analyses revealed a lack of compensatory base changes in ITS2 rRNA structure, low to intermediate ITS/5.8S uncorrected genetic distances, and evidence of reticulation. Together these data (criteria currently used for species delineation in dinoflagellates) imply that the A. ostenfeldii complex should be regarded a single genetically structured species until more material and alternative criteria for species delimitation are available. Consequently, we propose that A. peruvianum is a heterotypic synonym of A. ostenfeldii and this taxon name should be discontinued.
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Affiliation(s)
- Anke Kremp
- Finnish Environment Institute, Marine Research Centre, Erik Palménin aukio 1, Helsinki, 00560, Finland
| | - Pia Tahvanainen
- Finnish Environment Institute, Marine Research Centre, Erik Palménin aukio 1, Helsinki, 00560, Finland
- University of Helsinki, Tvärminne Zoological Station, J.A. Palménin tie 260, Hanko, 10900, Finland
| | - Wayne Litaker
- National Oceanic and Atmospheric Administration, National Ocean Service, Center for Coastal Fisheries and Habitat Research, 101 Pivers Island Rd., Beaufort, North Carolina
| | - Bernd Krock
- Alfred Wegener Institute for Polar and Marine Research, Division of Biosciences, Am Handelshafen 12, Bremerhaven, 27570, Germany
| | - Sanna Suikkanen
- Finnish Environment Institute, Marine Research Centre, Erik Palménin aukio 1, Helsinki, 00560, Finland
| | - Chui Pin Leaw
- Institute of Biodiversity and Environmental Conservation, University Malaysia Sarawak, Kota Samarahan, Sarawak, 94300, Malaysia
| | - Carmelo Tomas
- University of North Carolina at Wilmington, Center for Marine Science, Myrtle Grove 2336, Wilmington, North Carolina
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Sjöqvist C, Kremp A, Lindehoff E, Båmstedt U, Egardt J, Gross S, Jönsson M, Larsson H, Pohnert G, Richter H, Selander E, Godhe A. Effects of grazer presence on genetic structure of a phenotypically diverse diatom population. Microb Ecol 2014; 67:83-95. [PMID: 24272280 DOI: 10.1007/s00248-013-0327-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/08/2013] [Accepted: 11/06/2013] [Indexed: 06/02/2023]
Abstract
Studies of predator-prey systems in both aquatic and terrestrial environments have shown that grazers structure the intraspecific diversity of prey species, given that the prey populations are phenotypically variable. Populations of phytoplankton have traditionally considered comprising only low intraspecific variation, hence selective grazing as a potentially structuring factor of both genetic and phenotypic diversity has not been comprehensively studied. In this study, we compared strain specific growth rates, production of polyunsaturated aldehydes, and chain length of the marine diatom Skeletonema marinoi in both grazer and non-grazer conditions by conducting monoclonal experiments. Additionally, a mesocosm experiment was performed with multiclonal experimental S. marinoi populations exposed to grazers at different levels of copepod concentration to test effects of grazer presence on diatom diversity in close to natural conditions. Our results show that distinct genotypes of a geographically restricted population exhibit variable phenotypic traits relevant to grazing interactions such as chain length and growth rates. Grazer presence affected clonal richness and evenness of multiclonal Skeletonema populations in the mesocosms, likely in conjunction with intrinsic interactions among the diatom strains. Only the production of polyunsaturated aldehydes was not affected by grazer presence. Our findings suggest that grazing can be an important factor structuring diatom population diversity in the sea and emphasize the importance of considering clonal differences when characterizing species and their role in nature.
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Affiliation(s)
- C Sjöqvist
- Finnish Environmental Institute/Marine Research Centre, Erik Palmenin aukio 1, 00560, Helsinki, Finland,
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Tahvanainen P, Alpermann TJ, Figueroa RI, John U, Hakanen P, Nagai S, Blomster J, Kremp A. Patterns of post-glacial genetic differentiation in marginal populations of a marine microalga. PLoS One 2012; 7:e53602. [PMID: 23300940 PMCID: PMC3534129 DOI: 10.1371/journal.pone.0053602] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2012] [Accepted: 11/30/2012] [Indexed: 11/18/2022] Open
Abstract
This study investigates the genetic structure of an eukaryotic microorganism, the toxic dinoflagellate Alexandrium ostenfeldii, from the Baltic Sea, a geologically young and ecologically marginal brackish water estuary which is predicted to support evolution of distinct, genetically impoverished lineages of marine macroorganisms. Analyses of the internal transcribed spacer (ITS) sequences and Amplified Fragment Length Polymorphism (AFLP) of 84 A. ostenfeldii isolates from five different Baltic locations and multiple external sites revealed that Baltic A. ostenfeldii is phylogenetically differentiated from other lineages of the species and micro-geographically fragmented within the Baltic Sea. Significant genetic differentiation (F(ST)) between northern and southern locations was correlated to geographical distance. However, instead of discrete genetic units or continuous genetic differentiation, the analysis of population structure suggests a complex and partially hierarchic pattern of genetic differentiation. The observed pattern suggests that initial colonization was followed by local differentiation and varying degrees of dispersal, most likely depending on local habitat conditions and prevailing current systems separating the Baltic Sea populations. Local subpopulations generally exhibited low levels of overall gene diversity. Association analysis suggests predominately asexual reproduction most likely accompanied by frequency shifts of clonal lineages during planktonic growth. Our results indicate that the general pattern of genetic differentiation and reduced genetic diversity of Baltic populations found in large organisms also applies to microscopic eukaryotic organisms.
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Affiliation(s)
- Pia Tahvanainen
- Marine Research Centre, Finnish Environment Institute, Helsinki, Finland.
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Kremp A, Godhe A, Egardt J, Dupont S, Suikkanen S, Casabianca S, Penna A. Intraspecific variability in the response of bloom-forming marine microalgae to changed climate conditions. Ecol Evol 2012; 2:1195-207. [PMID: 22833794 PMCID: PMC3402194 DOI: 10.1002/ece3.245] [Citation(s) in RCA: 124] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2011] [Revised: 02/24/2012] [Accepted: 02/24/2012] [Indexed: 11/08/2022] Open
Abstract
Phytoplankton populations can display high levels of genetic diversity that, when reflected by phenotypic variability, may stabilize a species response to environmental changes. We studied the effects of increased temperature and CO(2) availability as predicted consequences of global change, on 16 genetically different isolates of the diatom Skeletonema marinoi from the Adriatic Sea and the Skagerrak (North Sea), and on eight strains of the PST (paralytic shellfish toxin)-producing dinoflagellate Alexandrium ostenfeldii from the Baltic Sea. Maximum growth rates were estimated in batch cultures of acclimated isolates grown for five to 10 generations in a factorial design at 20 and 24°C, and present day and next century applied atmospheric pCO(2), respectively. In both species, individual strains were affected in different ways by increased temperature and pCO(2). The strongest response variability, buffering overall effects, was detected among Adriatic S. marinoi strains. Skagerrak strains showed a more uniform response, particularly to increased temperature, with an overall positive effect on growth. Increased temperature also caused a general growth stimulation in A. ostenfeldii, despite notable variability in strain-specific response patterns. Our data revealed a significant relationship between strain-specific growth rates and the impact of pCO(2) on growth-slow growing cultures were generally positively affected, while fast growing cultures showed no or negative responses to increased pCO(2). Toxin composition of A. ostenfeldii was consistently altered by elevated temperature and increased CO(2) supply in the tested strains, resulting in overall promotion of saxitoxin production by both treatments. Our findings suggest that phenotypic variability within populations plays an important role in the adaptation of phytoplankton to changing environments, potentially attenuating short-term effects and forming the basis for selection. In particular, A. ostenfeldii blooms may expand and increase in toxicity under increased water temperature and atmospheric pCO(2) conditions, with potentially severe consequences for the coastal ecosystem.
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Affiliation(s)
- Anke Kremp
- Marine Research Centre, Finnish Environment Institute00251 Helsinki, Finland
| | - Anna Godhe
- Department of Biological and Environmental Sciences, University of Gothenburg40530 Göteborg, Sweden
| | - Jenny Egardt
- Department of Biological and Environmental Sciences, University of Gothenburg40530 Göteborg, Sweden
| | - Sam Dupont
- Department of Biological and Environmental Sciences, University of Gothenburg40530 Göteborg, Sweden
| | - Sanna Suikkanen
- Marine Research Centre, Finnish Environment Institute00251 Helsinki, Finland
| | - Silvia Casabianca
- Department of Biomolecular Sciences, University of Urbino61121 Pesaro, Italy
| | - Antonella Penna
- Department of Biomolecular Sciences, University of Urbino61121 Pesaro, Italy
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Klais R, Tamminen T, Kremp A, Spilling K, Olli K. Decadal-scale changes of dinoflagellates and diatoms in the anomalous baltic sea spring bloom. PLoS One 2011; 6:e21567. [PMID: 21747911 PMCID: PMC3126836 DOI: 10.1371/journal.pone.0021567] [Citation(s) in RCA: 112] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2011] [Accepted: 06/02/2011] [Indexed: 11/29/2022] Open
Abstract
The algal spring bloom in the Baltic Sea represents an anomaly from the winter-spring bloom patterns worldwide in terms of frequent and recurring dominance of dinoflagellates over diatoms. Analysis of approximately 3500 spring bloom samples from the Baltic Sea monitoring programs revealed (i) that within the major basins the proportion of dinoflagellates varied from 0.1 (Kattegat) to >0.8 (central Baltic Proper), and (ii) substantial shifts (e.g. from 0.2 to 0.6 in the Gulf of Finland) in the dinoflagellate proportion over four decades. During a recent decade (1995–2004) the proportion of dinoflagellates increased relative to diatoms mostly in the northernmost basins (Gulf of Bothnia, from 0.1 to 0.4) and in the Gulf of Finland, (0.4 to 0.6) which are typically ice-covered areas. We hypothesize that in coastal areas a specific sequence of seasonal events, involving wintertime mixing and resuspension of benthic cysts, followed by proliferation in stratified thin layers under melting ice, favors successful seeding and accumulation of dense dinoflagellate populations over diatoms. This head-start of dinoflagellates by the onset of the spring bloom is decisive for successful competition with the faster growing diatoms. Massive cyst formation and spreading of cyst beds fuel the expanding and ever larger dinoflagellate blooms in the relatively shallow coastal waters. Shifts in the dominant spring bloom algal groups can have significant effects on major elemental fluxes and functioning of the Baltic Sea ecosystem, but also in the vast shelves and estuaries at high latitudes, where ice-associated cold-water dinoflagellates successfully compete with diatoms.
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Affiliation(s)
- Riina Klais
- Institute of Ecology and Earth Sciences, University of Tartu, Tartu, Estonia.
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Sundström AM, Kremp A, Daugbjerg N, Moestrup Ø, Ellegaard M, Hansen R, Hajdu S. GYMNODINIUM COROLLARIUM SP. NOV. (DINOPHYCEAE)-A NEW COLD-WATER DINOFLAGELLATE RESPONSIBLE FOR CYST SEDIMENTATION EVENTS IN THE BALTIC SEA(1). J Phycol 2009; 45:938-52. [PMID: 27034225 DOI: 10.1111/j.1529-8817.2009.00712.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
A naked dinoflagellate with a unique arrangement of chloroplasts in the center of the cell was isolated from the northern Baltic proper during a spring dinoflagellate bloom (March 2005). Morphological, ultrastructural, and molecular analyses revealed this dinoflagellate to be undescribed and belonging to the genus Gymnodinium F. Stein. Gymnodinium corollarium A. M. Sundström, Kremp et Daugbjerg sp. nov. possesses features typical of Gymnodinium sensu stricto, such as nuclear chambers and an apical groove running in a counterclockwise direction around the apex. Phylogenetic analyses based on partial nuclear-encoded LSU rDNA sequences place the species in close proximity to G. aureolum, but significant genetic distance, together with distinct morphological features, such as the position of chloroplasts, clearly justifies separation from this species. Temperature and salinity experiments revealed a preference of G. corollarium for low salinities and temperatures, confirming it to be a cold-water species well adapted to the brackish water conditions in the Baltic Sea. At nitrogen-deplete conditions, G. corollarium cultures produced small, slightly oval cysts resembling a previously unidentified cyst type commonly found in sediment trap samples collected from the northern and central open Baltic Sea. Based on LSU rDNA comparison, these cysts were assigned to G. corollarium. The cysts have been observed in many parts of the Baltic Sea, indicating the ecologic versatility of the species and its importance for the Baltic ecosystem.
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Affiliation(s)
- Annica M Sundström
- Department of Systems Ecology, Stockholm University, SE-106 91 Stockholm, SwedenFinnish Environment Institute, Mechelininkatu 34A, 00251 Helsinki, Finland Tvärminne Zoological Station, University of Helsinki, J.A. Palmenintie 260, FI-10900 Hanko, FinlandPhycology Laboratory, Department of Biology, University of Copenhagen, Øster Farimagsgade 2D, DK-1353 Copenhagen K, DenmarkLeibniz Institute for Baltic Sea Research Warnemünde, Seestraße 15, D-18119 Rostock, GermanyDepartment of Systems Ecology, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Anke Kremp
- Department of Systems Ecology, Stockholm University, SE-106 91 Stockholm, SwedenFinnish Environment Institute, Mechelininkatu 34A, 00251 Helsinki, Finland Tvärminne Zoological Station, University of Helsinki, J.A. Palmenintie 260, FI-10900 Hanko, FinlandPhycology Laboratory, Department of Biology, University of Copenhagen, Øster Farimagsgade 2D, DK-1353 Copenhagen K, DenmarkLeibniz Institute for Baltic Sea Research Warnemünde, Seestraße 15, D-18119 Rostock, GermanyDepartment of Systems Ecology, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Niels Daugbjerg
- Department of Systems Ecology, Stockholm University, SE-106 91 Stockholm, SwedenFinnish Environment Institute, Mechelininkatu 34A, 00251 Helsinki, Finland Tvärminne Zoological Station, University of Helsinki, J.A. Palmenintie 260, FI-10900 Hanko, FinlandPhycology Laboratory, Department of Biology, University of Copenhagen, Øster Farimagsgade 2D, DK-1353 Copenhagen K, DenmarkLeibniz Institute for Baltic Sea Research Warnemünde, Seestraße 15, D-18119 Rostock, GermanyDepartment of Systems Ecology, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Øjvind Moestrup
- Department of Systems Ecology, Stockholm University, SE-106 91 Stockholm, SwedenFinnish Environment Institute, Mechelininkatu 34A, 00251 Helsinki, Finland Tvärminne Zoological Station, University of Helsinki, J.A. Palmenintie 260, FI-10900 Hanko, FinlandPhycology Laboratory, Department of Biology, University of Copenhagen, Øster Farimagsgade 2D, DK-1353 Copenhagen K, DenmarkLeibniz Institute for Baltic Sea Research Warnemünde, Seestraße 15, D-18119 Rostock, GermanyDepartment of Systems Ecology, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Marianne Ellegaard
- Department of Systems Ecology, Stockholm University, SE-106 91 Stockholm, SwedenFinnish Environment Institute, Mechelininkatu 34A, 00251 Helsinki, Finland Tvärminne Zoological Station, University of Helsinki, J.A. Palmenintie 260, FI-10900 Hanko, FinlandPhycology Laboratory, Department of Biology, University of Copenhagen, Øster Farimagsgade 2D, DK-1353 Copenhagen K, DenmarkLeibniz Institute for Baltic Sea Research Warnemünde, Seestraße 15, D-18119 Rostock, GermanyDepartment of Systems Ecology, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Regina Hansen
- Department of Systems Ecology, Stockholm University, SE-106 91 Stockholm, SwedenFinnish Environment Institute, Mechelininkatu 34A, 00251 Helsinki, Finland Tvärminne Zoological Station, University of Helsinki, J.A. Palmenintie 260, FI-10900 Hanko, FinlandPhycology Laboratory, Department of Biology, University of Copenhagen, Øster Farimagsgade 2D, DK-1353 Copenhagen K, DenmarkLeibniz Institute for Baltic Sea Research Warnemünde, Seestraße 15, D-18119 Rostock, GermanyDepartment of Systems Ecology, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Susanna Hajdu
- Department of Systems Ecology, Stockholm University, SE-106 91 Stockholm, SwedenFinnish Environment Institute, Mechelininkatu 34A, 00251 Helsinki, Finland Tvärminne Zoological Station, University of Helsinki, J.A. Palmenintie 260, FI-10900 Hanko, FinlandPhycology Laboratory, Department of Biology, University of Copenhagen, Øster Farimagsgade 2D, DK-1353 Copenhagen K, DenmarkLeibniz Institute for Baltic Sea Research Warnemünde, Seestraße 15, D-18119 Rostock, GermanyDepartment of Systems Ecology, Stockholm University, SE-106 91 Stockholm, Sweden
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Logares R, Daugbjerg N, Boltovskoy A, Kremp A, Laybourn-Parry J, Rengefors K. Recent evolutionary diversification of a protist lineage. Environ Microbiol 2008; 10:1231-43. [DOI: 10.1111/j.1462-2920.2007.01538.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Logares R, Rengefors K, Kremp A, Shalchian-Tabrizi K, Boltovskoy A, Tengs T, Shurtleff A, Klaveness D. Phenotypically different microalgal morphospecies with identical ribosomal DNA: a case of rapid adaptive evolution? Microb Ecol 2007; 53:549-61. [PMID: 17410396 DOI: 10.1007/s00248-006-9088-y] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2006] [Accepted: 04/23/2006] [Indexed: 05/14/2023]
Abstract
The agents driving the divergence and speciation of free-living microbial populations are still largely unknown. We investigated the dinoflagellate morphospecies Scrippsiella hangoei and Peridinium aciculiferum, which abound in the Baltic Sea and in northern temperate lakes, respectively. Electron microscopy analyses showed significant interspecific differences in the external cellular morphology, but a similar plate pattern in the characteristic dinoflagellate armor. Experimentally, S. hangoei grew in a wide range of salinities (0-30), whereas P. aciculiferum only grew in low salinities (0-3). Despite these phenotypic differences and the habitat segregation, molecular analyses showed identical ribosomal DNA sequences (ITS1, ITS2, 5.8S, SSU, and partial LSU) for both morphospecies. Yet, a strong interspecific genetic isolation was indicated by amplified fragment length polymorphism (F (ST) = 0.76) and cytochrome b (cob) sequence divergence ( approximately 1.90%). Phylogenetic reconstructions based on ribosomal (SSU, LSU) and mitochondrial (cob) DNA indicated a recent marine ancestor for P. aciculiferum. In conclusion, we suggest that the lacustrine P. aciculiferum and the marine-brackish S. hangoei diverged very recently, after a marine-freshwater transition that exposed the ancestral populations to different selective pressures. This hypothetical scenario agrees with mounting data indicating a significant role of natural selection in the divergence of free-living microbes, despite their virtually unrestricted dispersal capabilities. Finally, our results indicate that identical ITS rDNA sequences do not necessarily imply the same microbial species, as commonly assumed.
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Affiliation(s)
- Ramiro Logares
- Limnology Division, Ecology Department, Lund University, Lund, Sweden.
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Schliephacke M, Kremp A, Schmid HP, Köhler K, Kull U. Prosomes (proteasomes) of higher plants. Eur J Cell Biol 1991; 55:114-21. [PMID: 1915409] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
From different plant tissues such as tobacco (Nicotiana rustica), potato (Solanum tuberosum), and mung bean (Phaseolus radiatus), ring- or cylinder-shaped particles called prosomes were isolated by either sucrose gradient centrifugation or fast protein liquid chromatography (FPLC). These particles have a diameter of 12 to 14 nm and a length of 16 to 18 nm. They migrate under conditions of nondenaturing gel electrophoresis as one distinct band. Sedimentation coefficient and buoyant density in Cs2SO4 of the plant prosomes were determined by analytical ultracentrifugation to be approximately 23S and 1.23 g/cm3, respectively. The total molecular mass was estimated by gel filtration to be 650 kDa. Plant prosomes are composed of 12 to 15 proteins with molecular masses in the range of 24 to 35 kDa with isoelectric points of pH 5 to 7 as revealed by two-dimensional gel electrophoresis. The protein patterns of prosomes from the three different plant species are very similar. Polyclonal antisera against potato prosomes reacted in Western blots with prosomal proteins of all three plant species. They also bind to some prosomal proteins of animal species. Antisera against animal prosomes react with some proteins of plant prosomes. As shown by lectin blotting, plant prosomes are glycosylated carrying glucosyl- or mannosyl, and N-acetylgalactosaminyl residues. Prosomal preparations contain non-stoichiometric amounts of small RNA of about 80 kDa. These results suggest that plant prosomes are structurally and functionally homologous to prosomes of other eukaryotic cells.
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Affiliation(s)
- M Schliephacke
- Biologisches Institut der Universität, Stuttgart/Bundesrepublik Deutschland
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Abstract
A 19S particle was purified from tobacco (Nicotiana rustica) leaf cells. Its density was determined as 1296 g/cm3 in Cs2SO4-DMSO gradients, indicating the presence of RNA and protein. Polyacrylamide gel electrophoresis (PAGE) revealed eight distinct proteins in the range of 20-30 kD and RNA in the range of 70-80 nucleotides. Electron microscopic examination showed the same raspberry-shaped structure with a central depression as described for prosomes. We conclude that tobacco 19S particles represent small cytoplasmic complexes, possessing biochemical and structural characteristics similar to the hither-to known prosomes of animal cells.
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Kirschner H, Kremp A, Lyssy M, Poppe H. [A continuous position marker for whole-body computed tomography (author's transl)]. Strahlentherapie 1980; 156:542-4. [PMID: 7414648] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
A new continuous position marker for whole-body computed tomography marks the distance from an anatomical point or from a radiation field, the left side of the patient, and the zero level in front of or behind the CT-picture.
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Kirschner H, Kremp A, Poppe H. [The possibility of side effects during the application of roentgenologic contrast media by the method of the biphasic bolus/perfusor injection and the monophasic bolus injection (author's transl)]. ROFO-FORTSCHR RONTG 1980; 133:119-24. [PMID: 6449424 DOI: 10.1055/s-2008-1056688] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
In spite to lower the dose dependent side effects by the application of roentgenologic contrast media in the computed tomography a system of a biphasic injection per bolus and perfusor was installed and compared with that of the monophasic bolus injection. Special rules on the installation of the perfusor at CT should be observed.
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Abstract
A 25-year-old woman who had experienced brief periods of loss of consciousness and grand mal seizures was found to have a midline mass in the sellar region as evidenced by computer tomography and angiography. Preoperatively, it was thought to be a meningioma but histologically and ultrastructurally it turned out to be a Schwannoma. Since cranial nerves were not involved, clinically or morphologically, this nerve sheath tumour could have originated from Schwann cells of sensory, possibly trigeminal, nerves, vasomotor nerves, or ectopic Schwann cells.
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