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Choquet M, Lenner F, Cocco A, Toullec G, Corre E, Toullec JY, Wallberg A. Comparative Population Transcriptomics Provide New Insight into the Evolutionary History and Adaptive Potential of World Ocean Krill. Mol Biol Evol 2023; 40:msad225. [PMID: 37816123 PMCID: PMC10642690 DOI: 10.1093/molbev/msad225] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2023] [Revised: 08/31/2023] [Accepted: 09/25/2023] [Indexed: 10/12/2023] Open
Abstract
Genetic variation is instrumental for adaptation to changing environments but it is unclear how it is structured and contributes to adaptation in pelagic species lacking clear barriers to gene flow. Here, we applied comparative genomics to extensive transcriptome datasets from 20 krill species collected across the Atlantic, Indian, Pacific, and Southern Oceans. We compared genetic variation both within and between species to elucidate their evolutionary history and genomic bases of adaptation. We resolved phylogenetic interrelationships and uncovered genomic evidence to elevate the cryptic Euphausia similis var. armata into species. Levels of genetic variation and rates of adaptive protein evolution vary widely. Species endemic to the cold Southern Ocean, such as the Antarctic krill Euphausia superba, showed less genetic variation and lower evolutionary rates than other species. This could suggest a low adaptive potential to rapid climate change. We uncovered hundreds of candidate genes with signatures of adaptive evolution among Antarctic Euphausia but did not observe strong evidence of adaptive convergence with the predominantly Arctic Thysanoessa. We instead identified candidates for cold-adaptation that have also been detected in Antarctic fish, including genes that govern thermal reception such as TrpA1. Our results suggest parallel genetic responses to similar selection pressures across Antarctic taxa and provide new insights into the adaptive potential of important zooplankton already affected by climate change.
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Affiliation(s)
- Marvin Choquet
- Department of Medical Biochemistry and Microbiology, Uppsala University, Uppsala, Sweden
- Natural History Museum, University of Oslo, Oslo, Norway
| | - Felix Lenner
- Department of Medical Biochemistry and Microbiology, Uppsala University, Uppsala, Sweden
- Department of Immunology, Genetics and Pathology, Uppsala University, Uppsala, Sweden
| | - Arianna Cocco
- Department of Medical Biochemistry and Microbiology, Uppsala University, Uppsala, Sweden
| | - Gaëlle Toullec
- Laboratory for Biological Geochemistry, School of Architecture, Civil and Environmental Engineering, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
| | - Erwan Corre
- CNRS, Sorbonne Université, FR 2424, ABiMS Platform, Station Biologique de Roscoff, Roscoff, France
| | - Jean-Yves Toullec
- CNRS, UMR 7144, AD2M, Sorbonne Université, Station Biologique de Roscoff, Roscoff, France
| | - Andreas Wallberg
- Department of Medical Biochemistry and Microbiology, Uppsala University, Uppsala, Sweden
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2
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Jackson AC, Jorna J, Chaston JM, Adams BJ. Glacial Legacies: Microbial Communities of Antarctic Refugia. BIOLOGY 2022; 11:biology11101440. [PMID: 36290344 PMCID: PMC9598129 DOI: 10.3390/biology11101440] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2022] [Revised: 09/26/2022] [Accepted: 09/30/2022] [Indexed: 11/06/2022]
Abstract
In the cold deserts of the McMurdo Dry Valleys (MDV) the suitability of soil for microbial life is determined by both contemporary processes and legacy effects. Climatic changes and accompanying glacial activity have caused local extinctions and lasting geochemical changes to parts of these soil ecosystems over several million years, while areas of refugia may have escaped these disturbances and existed under relatively stable conditions. This study describes the impact of historical glacial and lacustrine disturbance events on microbial communities across the MDV to investigate how this divergent disturbance history influenced the structuring of microbial communities across this otherwise very stable ecosystem. Soil bacterial communities from 17 sites representing either putative refugia or sites disturbed during the Last Glacial Maximum (LGM) (22-17 kya) were characterized using 16 S metabarcoding. Regardless of geographic distance, several putative refugia sites at elevations above 600 m displayed highly similar microbial communities. At a regional scale, community composition was found to be influenced by elevation and geographic proximity more so than soil geochemical properties. These results suggest that despite the extreme conditions, diverse microbial communities exist in these putative refugia that have presumably remained undisturbed at least through the LGM. We suggest that similarities in microbial communities can be interpreted as evidence for historical climate legacies on an ecosystem-wide scale.
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Affiliation(s)
- Abigail C. Jackson
- Department of Biology, Brigham Young University, Provo, UT 84602, USA
- Correspondence: (A.C.J.); (J.J.)
| | - Jesse Jorna
- Department of Biology, Brigham Young University, Provo, UT 84602, USA
- Correspondence: (A.C.J.); (J.J.)
| | - John M. Chaston
- Department of Plant and Wildlife Sciences, Brigham Young University, Provo, UT 84602, USA
| | - Byron J. Adams
- Department of Biology, Brigham Young University, Provo, UT 84602, USA
- Monte L. Bean Museum, Brigham Young University, Provo, UT 84602, USA
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3
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Kitchel ZJ, Conrad HM, Selden RL, Pinsky ML. The role of continental shelf bathymetry in shaping marine range shifts in the face of climate change. GLOBAL CHANGE BIOLOGY 2022; 28:5185-5199. [PMID: 35698263 PMCID: PMC9540106 DOI: 10.1111/gcb.16276] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2022] [Revised: 05/05/2022] [Accepted: 05/10/2022] [Indexed: 05/26/2023]
Abstract
As a consequence of anthropogenic climate change, marine species on continental shelves around the world are rapidly shifting deeper and poleward. However, whether these shifts deeper and poleward will allow species to access more, less, or equivalent amounts of continental shelf area and associated critical habitats remains unclear. By examining the proportion of seabed area at a range of depths for each large marine ecosystem (LME), we found that shelf area declined monotonically for 19% of LMEs examined. However, the majority exhibited a greater proportion of shelf area in mid-depths or across several depth ranges. By comparing continental shelf area across 2° latitudinal bands, we found that all coastlines exhibit multiple instances of shelf area expansion and contraction, which have the potential to promote or restrict poleward movement of marine species. Along most coastlines, overall shelf habitat increases or exhibits no significant change moving towards the poles. The exception is the Southern West Pacific, which experiences an overall loss of area with increasing latitude. Changes in continental shelf area availability across latitudes and depths are likely to affect the number of species local ecosystems can support. These geometric analyses help identify regions of conservation priority and ecological communities most likely to face attrition or expansion due to variations in available area.
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Affiliation(s)
- Zoë J. Kitchel
- Ecology and Evolution Graduate ProgramRutgers UniversityNew BrunswickNew JerseyUSA
| | - Hailey M. Conrad
- Department of Fish and Wildlife ConservationBlacksburgVirginiaUSA
| | | | - Malin L. Pinsky
- Department of Ecology, Evolution, and Natural ResourcesRutgers UniversityNew BrunswickNew JerseyUSA
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4
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Phillips LM, Leihy RI, Chown SL. Improving species-based area protection in Antarctica. CONSERVATION BIOLOGY : THE JOURNAL OF THE SOCIETY FOR CONSERVATION BIOLOGY 2022; 36:e13885. [PMID: 35040183 DOI: 10.1111/cobi.13885] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/10/2021] [Revised: 12/13/2021] [Accepted: 12/27/2021] [Indexed: 06/14/2023]
Abstract
Area protection is a major mechanism deployed for environmental conservation in Antarctica. Yet, the Antarctic protected areas network is widely acknowledged as inadequate, in part because the criteria for area protection south of 60°S are not fully applied. The most poorly explored of these criteria is the type locality of species, which provides the primary legal means for Antarctic species-based area protection and a method for conserving species even if little is known about their habitat or distribution. The type locality criterion has not been systematically assessed since its incorporation into the Protocol on Environmental Protection to the Antarctic Treaty in 1991, so the extent to which the criterion is being met or might be useful for area protection is largely unknown. To address the matter, we created and analyzed a comprehensive database of Antarctic type localities of terrestrial and lacustrine lichens, plants, and animals. We compiled the database via a literature search of key taxonomic and geographic terms and then analyzed the distance between type localities identifiable to a ≤ 25km2 resolution and current Antarctic Specially Protected Areas (ASPAs) and human infrastructure. We used a distance-clustering approach for localities outside current ASPAs to determine candidate protected areas that could contain these unprotected localities. Of the 386 type localities analyzed, 108 were within or overlapped current ASPAs. Inclusion of the remaining 278 type localities in the ASPA network would require the designation of a further 105 protected areas. Twenty-four of these areas included human infrastructure disturbance. Given the slow rate of ASPA designation, growing pace of human impacts on the continent, and the management burden associated with ASPAs, we propose ways in which the type locality criterion might best be deployed. These include a comprehensive, systematic conservation planning approach and an alternative emphasis on the habitat of species, rather than on a single locality.
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Affiliation(s)
- Laura M Phillips
- Securing Antarctica's Environmental Future, School of Biological Sciences, Monash University, Melbourne, Victoria, Australia
| | - Rachel I Leihy
- Securing Antarctica's Environmental Future, School of Biological Sciences, Monash University, Melbourne, Victoria, Australia
| | - Steven L Chown
- Securing Antarctica's Environmental Future, School of Biological Sciences, Monash University, Melbourne, Victoria, Australia
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5
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Cowart DA, Schiaparelli S, Alvaro MC, Cecchetto M, Le Port AS, Jollivet D, Hourdez S. Origin, diversity, and biogeography of Antarctic scale worms (Polychaeta: Polynoidae): a wide-scale barcoding approach. Ecol Evol 2022; 12:e9093. [PMID: 35866013 PMCID: PMC9288932 DOI: 10.1002/ece3.9093] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2021] [Revised: 05/06/2022] [Accepted: 05/23/2022] [Indexed: 11/14/2022] Open
Abstract
The Antarctic marine environment hosts diversified and highly endemic benthos owing to its unique geologic and climatic history. Current warming trends have increased the urgency of understanding Antarctic species history to predict how environmental changes will impact ecosystem functioning. Antarctic benthic lineages have traditionally been examined under three hypotheses: (1) high endemism and local radiation, (2) emergence of deep‐sea taxa through thermohaline circulation, and (3) species migrations across the Polar Front. In this study, we investigated which hypotheses best describe benthic invertebrate origins by examining Antarctic scale worms (Polynoidae). We amassed 691 polynoid sequences from the Southern Ocean and neighboring areas: the Kerguelen and Tierra del Fuego (South America) archipelagos, the Indian Ocean, and waters around New Zealand. We performed phylogenetic reconstructions to identify lineages across geographic regions, aided by mitochondrial markers cytochrome c oxidase subunit I (Cox1) and 16S ribosomal RNA (16S). Additionally, we produced haplotype networks at the species scale to examine genetic diversity, biogeographic separations, and past demography. The Cox1 dataset provided the most illuminating insights into the evolution of polynoids, with a total of 36 lineages identified. Eunoe sp. was present at Tierra del Fuego and Kerguelen, in favor of the latter acting as a migration crossroads. Harmothoe fuligineum, widespread around the Antarctic continent, was also present but isolated at Kerguelen, possibly resulting from historical freeze–thaw cycles. The genus Polyeunoa appears to have diversified prior to colonizing the continent, leading to the co‐occurrence of at least three cryptic species around the Southern and Indian Oceans. Analyses identified that nearly all populations are presently expanding following a bottleneck event, possibly caused by habitat reduction from the last glacial episodes. Findings support multiple origins for contemporary Antarctic polynoids, and some species investigated here provide information on ancestral scenarios of (re)colonization. First, it is apparent that species collected from the Antarctic continent are endemic, as the absence of closely related species in the Kerguelen and Tierra del Fuego datasets for most lineages argues in favor of Hypothesis 1 of local origin. Next, Eunoe sp. and H. fuligineum, however, support the possibility of Kerguelen and other sub‐Antarctic islands acting as a crossroads for larvae of some species, in support of Hypothesis 3. Finally, the genus Polyeunoa, conversely, is found at depths greater than 150 m and may have a deep origin, in line with Hypothesis 2. These “non endemic” groups, nevertheless, have a distribution that is either north or south of the Antarctic Polar Front, indicating that there is still a barrier to dispersal, even in the deep sea.
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Affiliation(s)
- Dominique A Cowart
- Department of Evolution, Ecology, and Behavior University of Illinois at Urbana - Champaign Urbana Illinois USA.,Company for Open Ocean Observations and Logging (COOOL) La Réunion France
| | - Stefano Schiaparelli
- Department of Earth, Environmental and Life Science (DiSTAV) University of Genoa Genoa Italy.,Italian National Antarctic Museum (MNA, Section of Genoa) University of Genoa Genoa Italy
| | - Maria Chiara Alvaro
- Department of Earth, Environmental and Life Science (DiSTAV) University of Genoa Genoa Italy
| | - Matteo Cecchetto
- Department of Earth, Environmental and Life Science (DiSTAV) University of Genoa Genoa Italy.,Italian National Antarctic Museum (MNA, Section of Genoa) University of Genoa Genoa Italy
| | - Anne-Sophie Le Port
- CNRS UMR 7144 'Adaptation et Diversité en Milieux Marins' (AD2M) Team 'Dynamique de la Diversité Marine' (DyDiv), Station Biologique de Roscoff Sorbonne Université Roscoff France
| | - Didier Jollivet
- CNRS UMR 7144 'Adaptation et Diversité en Milieux Marins' (AD2M) Team 'Dynamique de la Diversité Marine' (DyDiv), Station Biologique de Roscoff Sorbonne Université Roscoff France
| | - Stephane Hourdez
- CNRS UMR 7144 'Adaptation et Diversité en Milieux Marins' (AD2M) Team 'Dynamique de la Diversité Marine' (DyDiv), Station Biologique de Roscoff Sorbonne Université Roscoff France.,Laboratoire d'Ecogéochimie des Environnements Benthiques (LECOB), Observatoire Océanologique de Banyuls UMR 8222 CNRS-Sorbonne Université Banyuls-sur-mer France
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6
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Schächinger PM, Schrödl M, Wilson NG, Moles J. Crossing the polar front—Antarctic species discovery in the nudibranch genus Tritoniella (Gastropoda). ORG DIVERS EVOL 2022. [DOI: 10.1007/s13127-022-00541-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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7
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Maroni PJ, Baker BJ, Moran AL, Woods HA, Avila C, Johnstone GJ, Stark JS, Kocot KM, Lockhart S, Saucède T, Rouse GW, Wilson NG. One Antarctic slug to confuse them all: the underestimated diversity of Doris kerguelenensis. INVERTEBR SYST 2022. [DOI: 10.1071/is21073] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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8
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SILVA MAURÍCIOB, FEITOSA ALEXYAO, LIMA IGORG, BISPO JAMESR, SANTOS ANACAROLINEM, MOREIRA MAGNAS, CÂMARA PAULOE, ROSA LUIZHENRIQUE, OLIVEIRA VALÉRIAM, DUARTE ALYSSONW, QUEIROZ ALINEC. Antarctic organisms as a source of antimicrobial compounds: a patent review. AN ACAD BRAS CIENC 2022; 94:e20210840. [DOI: 10.1590/0001-3765202220210840] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2021] [Accepted: 09/16/2021] [Indexed: 11/22/2022] Open
Affiliation(s)
| | | | | | | | | | | | | | | | | | | | - ALINE C. QUEIROZ
- Universidade Federal de Alagoas, Brazil; Universidade Federal de Alagoas, Brazil
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9
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Hüner NPA, Smith DR, Cvetkovska M, Zhang X, Ivanov AG, Szyszka-Mroz B, Kalra I, Morgan-Kiss R. Photosynthetic adaptation to polar life: Energy balance, photoprotection and genetic redundancy. JOURNAL OF PLANT PHYSIOLOGY 2022; 268:153557. [PMID: 34922115 DOI: 10.1016/j.jplph.2021.153557] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/2021] [Revised: 09/27/2021] [Accepted: 10/24/2021] [Indexed: 06/14/2023]
Abstract
The persistent low temperature that characterize polar habitats combined with the requirement for light for all photoautotrophs creates a conundrum. The absorption of too much light at low temperature can cause an energy imbalance that decreases photosynthetic performance that has a negative impact on growth and can affect long-term survival. The goal of this review is to survey the mechanism(s) by which polar photoautotrophs maintain cellular energy balance, that is, photostasis to overcome the potential for cellular energy imbalance in their low temperature environments. Photopsychrophiles are photosynthetic organisms that are obligately adapted to low temperature (0⁰- 15 °C) but usually die at higher temperatures (≥20 °C). In contrast, photopsychrotolerant species can usually tolerate and survive a broad range of temperatures (5⁰- 40 °C). First, we summarize the basic concepts of excess excitation energy, energy balance, photoprotection and photostasis and their importance to survival in polar habitats. Second, we compare the photoprotective mechanisms that underlie photostasis and survival in aquatic cyanobacteria and green algae as well as terrestrial Antarctic and Arctic plants. We show that polar photopsychrophilic and photopsychrotolerant organisms attain energy balance at low temperature either through a regulated reduction in the efficiency of light absorption or through enhanced capacity to consume photosynthetic electrons by the induction of O2 as an alternative electron acceptor. Finally, we compare the published genomes of three photopsychrophilic and one photopsychrotolerant alga with five mesophilic green algae including the model green alga, Chlamydomonas reinhardtii. We relate our genomic analyses to photoprotective mechanisms that contribute to the potential attainment of photostasis. Finally, we discuss how the observed genomic redundancy in photopsychrophilic genomes may confer energy balance, photoprotection and resilience to their harsh polar environment. Primary production in aquatic, Antarctic and Arctic environments is dependent on diverse algal and cyanobacterial communities. Although mosses and lichens dominate the Antarctic terrestrial landscape, only two extant angiosperms exist in the Antarctic. The identification of a single 'molecular key' to unravel adaptation of photopsychrophily and photopsychrotolerance remains elusive. Since these photoautotrophs represent excellent biomarkers to assess the impact of global warming on polar ecosystems, increased study of these polar photoautotrophs remains essential.
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Affiliation(s)
- Norman P A Hüner
- Dept. of Biology and the Biotron Centre for Experimental Climate Change Research, University of Western Ontario, London, N6A 5B7, Canada.
| | - David R Smith
- Dept. of Biology, University of Western Ontario, London, N6A 5B7, Canada.
| | | | - Xi Zhang
- Dept. of Biology, University of Western Ontario, London, N6A 5B7, Canada.
| | - Alexander G Ivanov
- Dept. of Biology and the Biotron Centre for Experimental Climate Change Research, University of Western Ontario, London, N6A 5B7, Canada; Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Sofia, 1113, Bulgaria.
| | - Beth Szyszka-Mroz
- Dept. of Biology and the Biotron Centre for Experimental Climate Change Research, University of Western Ontario, London, N6A 5B7, Canada.
| | - Isha Kalra
- Dept. of Microbiology, Miami University of Ohio, Oxford, OH, 45056, USA.
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10
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Christiansen H, Heindler FM, Hellemans B, Jossart Q, Pasotti F, Robert H, Verheye M, Danis B, Kochzius M, Leliaert F, Moreau C, Patel T, Van de Putte AP, Vanreusel A, Volckaert FAM, Schön I. Facilitating population genomics of non-model organisms through optimized experimental design for reduced representation sequencing. BMC Genomics 2021; 22:625. [PMID: 34418978 PMCID: PMC8380342 DOI: 10.1186/s12864-021-07917-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2021] [Accepted: 07/26/2021] [Indexed: 12/26/2022] Open
Abstract
BACKGROUND Genome-wide data are invaluable to characterize differentiation and adaptation of natural populations. Reduced representation sequencing (RRS) subsamples a genome repeatedly across many individuals. However, RRS requires careful optimization and fine-tuning to deliver high marker density while being cost-efficient. The number of genomic fragments created through restriction enzyme digestion and the sequencing library setup must match to achieve sufficient sequencing coverage per locus. Here, we present a workflow based on published information and computational and experimental procedures to investigate and streamline the applicability of RRS. RESULTS In an iterative process genome size estimates, restriction enzymes and size selection windows were tested and scaled in six classes of Antarctic animals (Ostracoda, Malacostraca, Bivalvia, Asteroidea, Actinopterygii, Aves). Achieving high marker density would be expensive in amphipods, the malacostracan target taxon, due to the large genome size. We propose alternative approaches such as mitogenome or target capture sequencing for this group. Pilot libraries were sequenced for all other target taxa. Ostracods, bivalves, sea stars, and fish showed overall good coverage and marker numbers for downstream population genomic analyses. In contrast, the bird test library produced low coverage and few polymorphic loci, likely due to degraded DNA. CONCLUSIONS Prior testing and optimization are important to identify which groups are amenable for RRS and where alternative methods may currently offer better cost-benefit ratios. The steps outlined here are easy to follow for other non-model taxa with little genomic resources, thus stimulating efficient resource use for the many pressing research questions in molecular ecology.
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Affiliation(s)
- Henrik Christiansen
- Laboratory of Biodiversity and Evolutionary Genomics, KU Leuven, Leuven, Belgium.
| | - Franz M Heindler
- Laboratory of Biodiversity and Evolutionary Genomics, KU Leuven, Leuven, Belgium
| | - Bart Hellemans
- Laboratory of Biodiversity and Evolutionary Genomics, KU Leuven, Leuven, Belgium
| | - Quentin Jossart
- Marine Biology Group, Vrije Universiteit Brussel (VUB), Brussels, Belgium
| | | | - Henri Robert
- OD Nature, Royal Belgian Institute of Natural Sciences, Brussels, Belgium
| | - Marie Verheye
- OD Nature, Royal Belgian Institute of Natural Sciences, Brussels, Belgium
| | - Bruno Danis
- Marine Biology Laboratory, Université Libre de Bruxelles (ULB), Brussels, Belgium
| | - Marc Kochzius
- Marine Biology Group, Vrije Universiteit Brussel (VUB), Brussels, Belgium
| | - Frederik Leliaert
- Marine Biology Research Group, Ghent University, Ghent, Belgium.,Meise Botanic Garden, Meise, Belgium
| | - Camille Moreau
- Marine Biology Laboratory, Université Libre de Bruxelles (ULB), Brussels, Belgium.,Université de Bourgogne Franche-Comté (UBFC) UMR CNRS 6282 Biogéosciences, Dijon, France
| | - Tasnim Patel
- OD Nature, Royal Belgian Institute of Natural Sciences, Brussels, Belgium
| | - Anton P Van de Putte
- Laboratory of Biodiversity and Evolutionary Genomics, KU Leuven, Leuven, Belgium.,OD Nature, Royal Belgian Institute of Natural Sciences, Brussels, Belgium.,Marine Biology Laboratory, Université Libre de Bruxelles (ULB), Brussels, Belgium
| | - Ann Vanreusel
- Marine Biology Research Group, Ghent University, Ghent, Belgium
| | - Filip A M Volckaert
- Laboratory of Biodiversity and Evolutionary Genomics, KU Leuven, Leuven, Belgium
| | - Isa Schön
- OD Nature, Royal Belgian Institute of Natural Sciences, Brussels, Belgium
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11
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Volzke S, McMahon CR, Hindell MA, Burton HR, Wotherspoon SJ. Climate influences on female survival in a declining population of southern elephant seals ( Mirounga leonina). Ecol Evol 2021; 11:11333-11344. [PMID: 34429922 PMCID: PMC8366891 DOI: 10.1002/ece3.7919] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2020] [Revised: 06/21/2021] [Accepted: 06/25/2021] [Indexed: 11/22/2022] Open
Abstract
The Southern Ocean has been disproportionately affected by climate change and is therefore an ideal place to study the influence of changing environmental conditions on ecosystems. Changes in the demography of predator populations are indicators of broader shifts in food web structure, but long-term data are required to study these effects. Southern elephant seals (Mirounga leonina) from Macquarie Island have consistently decreased in population size while all other major populations across the Southern Ocean have recently stabilized or are increasing. Two long-term mark-recapture studies (1956-1967 and 1993-2009) have monitored this population, which provides an opportunity to investigate demographic performance over a range of climatic conditions. Using a 9-state matrix population model, we estimated climate influences on female survival by incorporating two major climatic indices into our model: The Southern Annular Mode (SAM) and the Southern Oscillation Index (SOI). Our best model included a 1 year lagged effect of SAM and an unlagged SOI as covariates. A positive relationship with SAM1 (lagged) related the previous year's SAM with juvenile survival, potentially due to changes in local prey availability surrounding Macquarie Island. The unlagged SOI had a negative effect on both juvenile and adult seals, indicating that sea ice dynamics and access to foraging grounds on the East Antarctic continental shelf could explain the different contributions of ENSO events on the survival of females in this population.
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Affiliation(s)
- Sophia Volzke
- Institute for Marine & Antarctic StudiesUniversity of TasmaniaHobartTas.Australia
| | - Clive R. McMahon
- Institute for Marine & Antarctic StudiesUniversity of TasmaniaHobartTas.Australia
- IMOS Animal TaggingSydney Institute of Marine ScienceMosmanNSWAustralia
| | - Mark A. Hindell
- Institute for Marine & Antarctic StudiesUniversity of TasmaniaHobartTas.Australia
- Antarctic Climate and Ecosystems Cooperative Research CentreUniversity of TasmaniaHobartTas.Australia
| | - Harry R. Burton
- Australian Antarctic DivisionDepartment of Agriculture, Water and the EnvironmentKingstonTas.Australia
| | - Simon J. Wotherspoon
- Institute for Marine & Antarctic StudiesUniversity of TasmaniaHobartTas.Australia
- Australian Antarctic DivisionDepartment of Agriculture, Water and the EnvironmentKingstonTas.Australia
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12
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Levicoy D, Rosenfeld S, Cárdenas L. Divergence time and species delimitation of microbivalves in the Southern Ocean: the case of Kidderia species. Polar Biol 2021; 44:1365-1377. [PMID: 34092908 PMCID: PMC8169414 DOI: 10.1007/s00300-021-02885-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2020] [Revised: 05/10/2021] [Accepted: 05/19/2021] [Indexed: 11/18/2022]
Abstract
The systematics of Subantarctic and Antarctic near-shore marine benthic invertebrates requires major revision and highlights the necessity to incorporate additional sources of information in the specimen identification chart in the Southern Ocean (SO). In this study, we aim to improve our understanding of the biodiversity of Kidderia (Dall 1876) through molecular and morphological comparisons of Antarctic and Subantarctic taxa. The microbivalves of the genus Kidderia are small brooding organisms that inhabit intertidal and shallow subtidal rocky ecosystems. This genus represents an interesting model to test the vicariance and dispersal hypothesis in the biogeography of the SO. However, the description of Kidderia species relies on a few morphological characters and biogeographic records that raise questions about the true diversity in the group. Here we will define the specimens collected with genetic tools, delimiting their respective boundaries across provinces of the SO, validating the presence of two species of Kidderia. Through the revision of taxonomic issues and species delimitation, it was possible to report that the Antarctic species is Kidderia subquadrata and the species recorded in the Subantarctic islands Diego Ramirez, South Georgia and the Kerguelen Archipelago is Kidderia minuta. The divergence time estimation suggests the origin and diversification of Kidderia lineages are related to historical vicariant processes probably associated with the separation of the continental landmasses close to the late Eocene.
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Affiliation(s)
- Daniela Levicoy
- Centro FONDAP- IDEAL, Facultad de Ciencias, Universidad Austral de Chile, Valdivia, Chile.,Instituto de Ciencias Ambientales & Evolutivas, Facultad de Ciencias, Universidad Austral de Chile, Independencia 641, P.O. Box 567, Valdivia, Chile
| | - Sebastián Rosenfeld
- Laboratorio de Ecología Molecular, Departamento de Ciencias Ecológicas, Facultad de Ciencias, Universidad de Chile, Las Palmeras #3425, Ñuñoa, Santiago Chile.,Laboratorio de Ecosistemas Marinos Antárticos y Subantárticos, Universidad de Magallanes, Avenida Bulnes 01890, Punta Arenas, Chile.,Instituto de Ecología y Biodiversidad, Las Palmeras 3425, Ñuñoa, Santiago Chile.,Centro de Investigación Gaia-Antártica, Universidad de Magallanes, Avenida Bulnes 01855, Punta Arenas, Chile
| | - Leyla Cárdenas
- Centro FONDAP- IDEAL, Facultad de Ciencias, Universidad Austral de Chile, Valdivia, Chile.,Instituto de Ciencias Ambientales & Evolutivas, Facultad de Ciencias, Universidad Austral de Chile, Independencia 641, P.O. Box 567, Valdivia, Chile
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13
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Moles J, Berning MI, Hooker Y, Padula V, Wilson NG, Schrödl M. Due South: The evolutionary history of Sub-Antarctic and Antarctic Tritoniidae nudibranchs. Mol Phylogenet Evol 2021; 162:107209. [PMID: 34044161 DOI: 10.1016/j.ympev.2021.107209] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2021] [Revised: 05/03/2021] [Accepted: 05/19/2021] [Indexed: 10/21/2022]
Abstract
The Tritoniidae provides one of the most famous model species for neurophysiology and behaviour, yet a well-developed phylogenetic framework for this family is still incomplete. In this study, we explored the species-level taxonomy, phylogenetic relationships, and geographic distributions of the tritoniid nudibranchs. During numerous expeditions, specimens from southern South America, Sub-Antarctic Islands, and Antarctica were collected, documented alive, and fixed for anatomical descriptions and genetic sequencing. DNA from 167 specimens were extracted and sequenced for mitochondrial (COI, 16S) and nuclear (H3) markers. An additional 109 sequences of all available tritoniids plus additional outgroups were downloaded from GenBank for comparative purposes. Maximum Likelihood under the GHOST model of evolution and Bayesian inference using the GTR + GAMMA model produced congruent topologies from concatenated alignments. The results of ABGD, GMYC, bPTP, and mPTP species delimitation analyses suggest many separately evolving units that do not coincide with traditionally recognized species limits. Southern Ocean Tritoniella and Tritonia species split into several previously unrecognized species. This result is in accordance with the limited dispersal abilities of some southern tritoniids. Along with the most complete phylogeny of Tritoniidae to date, we also provided many taxonomic notes at the species and genus level. Tritoniidae species are yet another example of under-recognized diversity in the Southern Ocean.
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Affiliation(s)
- Juan Moles
- SNSB-Bavarian State Collection of Zoology, Section Mollusca, Münchhausenstrasse 21, D-81247 Munich, Germany; Biozentrum Ludwig Maximilians University and GeoBio-Center LMU Munich, Germany.
| | - Maria I Berning
- SNSB-Bavarian State Collection of Zoology, Section Mollusca, Münchhausenstrasse 21, D-81247 Munich, Germany
| | - Yuri Hooker
- Universidad Peruana Cayetano Heredia, Laboratorio de Biología Marina, Facultad de Ciencias y Filosofía, Lima, Peru
| | - Vinicius Padula
- National Museum, Federal University of Rio de Janeiro, UFRJ, Quinta da Boa Vista, São Cristóvão, Rio de Janeiro, RJ 20940-040, Brazil
| | - Nerida G Wilson
- Collections & Research, Western Australian Museum, 49 Kew St, Welshpool, Perth, WA 6106, Australia; School of Biological Sciences, University of Western Australia, 35 Stirling Hwy, Crawley, WA 6009, Australia
| | - Michael Schrödl
- SNSB-Bavarian State Collection of Zoology, Section Mollusca, Münchhausenstrasse 21, D-81247 Munich, Germany; Biozentrum Ludwig Maximilians University and GeoBio-Center LMU Munich, Germany
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14
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Sterols in red macroalgae from antarctica: extraction and quantification by Gas Chromatography–Mass spectrometry. Polar Biol 2021. [DOI: 10.1007/s00300-021-02853-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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15
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Moles J, Derkarabetian S, Schiaparelli S, Schrödl M, Troncoso JS, Wilson NG, Giribet G. An approach using ddRADseq and machine learning for understanding speciation in Antarctic Antarctophilinidae gastropods. Sci Rep 2021; 11:8473. [PMID: 33875688 PMCID: PMC8055997 DOI: 10.1038/s41598-021-87244-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2020] [Accepted: 03/25/2021] [Indexed: 02/02/2023] Open
Abstract
Sampling impediments and paucity of suitable material for molecular analyses have precluded the study of speciation and radiation of deep-sea species in Antarctica. We analyzed barcodes together with genome-wide single nucleotide polymorphisms obtained from double digestion restriction site-associated DNA sequencing (ddRADseq) for species in the family Antarctophilinidae. We also reevaluated the fossil record associated with this taxon to provide further insights into the origin of the group. Novel approaches to identify distinctive genetic lineages, including unsupervised machine learning variational autoencoder plots, were used to establish species hypothesis frameworks. In this sense, three undescribed species and a complex of cryptic species were identified, suggesting allopatric speciation connected to geographic or bathymetric isolation. We further observed that the shallow waters around the Scotia Arc and on the continental shelf in the Weddell Sea present high endemism and diversity. In contrast, likely due to the glacial pressure during the Cenozoic, a deep-sea group with fewer species emerged expanding over great areas in the South-Atlantic Antarctic Ridge. Our study agrees on how diachronic paleoclimatic and current environmental factors shaped Antarctic communities both at the shallow and deep-sea levels, promoting Antarctica as the center of origin for numerous taxa such as gastropod mollusks.
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Affiliation(s)
- Juan Moles
- Museum of Comparative Zoology, Department of Organismic and Evolutionary Biology, Harvard University, 26 Oxford Street, Cambridge, MA, 02138, USA.
- SNSB-Bavarian State Collection of Zoology, Münchhausenstrasse 21, 81247, Munich, Germany.
- Biozentrum Ludwig Maximilians University and GeoBio-Center LMU Munich, Munich, Germany.
| | - Shahan Derkarabetian
- Museum of Comparative Zoology, Department of Organismic and Evolutionary Biology, Harvard University, 26 Oxford Street, Cambridge, MA, 02138, USA
| | - Stefano Schiaparelli
- DiSTAV, University of Genoa, C.so Europa 26, 16132, Genoa, Italy
- Italian National Antarctic Museum (MNA, Section of Genoa), Viale Benedetto XV n. 5, 16132, Genoa, Italy
| | - Michael Schrödl
- SNSB-Bavarian State Collection of Zoology, Münchhausenstrasse 21, 81247, Munich, Germany
- Biozentrum Ludwig Maximilians University and GeoBio-Center LMU Munich, Munich, Germany
| | - Jesús S Troncoso
- Departamento de Ecoloxía e Bioloxía Animal, Universidade de Vigo, Campus Lagoas-Marcosende s/n, 36200, Vigo, Spain
| | - Nerida G Wilson
- Collections and Research, Western Australian Museum, Welshpool DC, Locked Bag 49, Perth, WA, 6986, Australia
- School of Biological Sciences, University of Western Australia, 35 Stirling Hwy, Crawley, WA, 6009, Australia
| | - Gonzalo Giribet
- Museum of Comparative Zoology, Department of Organismic and Evolutionary Biology, Harvard University, 26 Oxford Street, Cambridge, MA, 02138, USA
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16
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Levicoy D, Flores K, Rosenfeld S, Cárdenas L. Phylogeography and genetic diversity of the microbivalve Kidderia subquadrata, reveals new data from West Antarctic Peninsula. Sci Rep 2021; 11:5705. [PMID: 33707560 PMCID: PMC7952419 DOI: 10.1038/s41598-021-85042-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2020] [Accepted: 02/19/2021] [Indexed: 12/14/2022] Open
Abstract
It is well established that Antarctic biodiversity has been strongly influenced by rapid climatic fluctuations during the Quaternary. Marine invertebrates from Antarctica constitute an interesting lens through which to study the impacts of the last glacial periods as glaciation impacted the distribution and intraspecific genetic variation of these animals. However, the impact on the spatial genetic distribution and historical demography of local processes in areas adjacent to the West Antarctic Peninsula (WAP) is less clear. Here we present new genetic information on the bivalve Kidderia subquadrata, a small mollusk that inhabits intertidal rocky island ecosystems throughout the WAP. Using a phylogeographical approach, we examined the spatial patterns of genetic diversity in this brooder species to test the hypothesis of strong genetic structure in incubating organisms and the hypothesis of glacial refugia in organisms with limited dispersion. We found evidence of strong genetic structure among populations of the WAP and a recent expansion in the South Shetland Islands. Our findings are concordant with the predictions that incubating organisms, abundant in Antarctica, present a strong genetic structure among their populations and also support the hypothesis of glacial refugia in organisms with limited dispersion. The effect of the coastal current pattern in the WAP is suggested as a driver to the local spatial dynamics of the genetic diversity distribution. Although genetic information about this microbivalve is still scarce, the knowledge reported here has increased our understanding of the evolutionary patterns of this organism that is endemic to the Southern Ocean.
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Affiliation(s)
- Daniela Levicoy
- Centro FONDAP- IDEAL, Instituto de Ciencias Ambientales and Evolutivas, Facultad de Ciencias, Universidad Austral de Chile, Independencia 641, P.O. Box 567, Valdivia, Punta Arenas, Chile
| | - Kamilla Flores
- Centro FONDAP- IDEAL, Instituto de Ciencias Ambientales and Evolutivas, Facultad de Ciencias, Universidad Austral de Chile, Independencia 641, P.O. Box 567, Valdivia, Punta Arenas, Chile
| | - Sebastián Rosenfeld
- Laboratorio de Ecosistemas Marinos Antárticos Y Subantárticos, Universidad de Magallanes, Casilla 113-D, Punta Arenas, Chile.,Laboratorio de Ecología Molecular, Departamento de Ciencias Ecológicas, Facultad de Ciencias, Universidad de Chile, Las Palmeras # 3425, Ñuñoa, Santiago, Chile.,Instituto de Ecología y Biodiversidad (IEB), Las Palmeras # 3425, Ñuñoa, Santiago, Chile
| | - Leyla Cárdenas
- Centro FONDAP- IDEAL, Instituto de Ciencias Ambientales and Evolutivas, Facultad de Ciencias, Universidad Austral de Chile, Independencia 641, P.O. Box 567, Valdivia, Punta Arenas, Chile.
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17
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Schiavon L, Dulière V, La Mesa M, Marino IAM, Codogno G, Boscari E, Riginella E, Battistotti A, Lucassen M, Zane L, Papetti C. Species distribution, hybridization and connectivity in the genus
Chionodraco
: Unveiling unknown icefish diversity in antarctica. DIVERS DISTRIB 2021. [DOI: 10.1111/ddi.13249] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Affiliation(s)
- Luca Schiavon
- Department of Biology University of Padova Padova Italy
| | - Valérie Dulière
- Royal Belgian Institute of Natural Sciences Brussels Belgium
| | | | - Ilaria Anna Maria Marino
- Department of Biology University of Padova Padova Italy
- Consorzio Nazionale Interuniversitario Per le Scienze del Mare (CoNISMa) Roma Italy
| | | | - Elisa Boscari
- Department of Biology University of Padova Padova Italy
- Consorzio Nazionale Interuniversitario Per le Scienze del Mare (CoNISMa) Roma Italy
| | | | | | - Magnus Lucassen
- Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research Bremerhaven Germany
| | - Lorenzo Zane
- Department of Biology University of Padova Padova Italy
- Consorzio Nazionale Interuniversitario Per le Scienze del Mare (CoNISMa) Roma Italy
| | - Chiara Papetti
- Department of Biology University of Padova Padova Italy
- Consorzio Nazionale Interuniversitario Per le Scienze del Mare (CoNISMa) Roma Italy
- Zoological Station Anton Dohrn Naples Italy
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18
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Núñez-Flores M, Gomez-Uchida D, López-González PJ. Molecular systematics of Thouarella (Octocorallia:Primnoidae) with the description of three new species from the Southern Ocean based on combined molecular and morphological evidence. INVERTEBR SYST 2021. [DOI: 10.1071/is20078] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Thouarella Gray, 1870, is one of the most speciose genera among gorgonians of the family Primnoidae (Cnidaria:Octocorallia:Anthozoa), being remarkably diverse in the Antarctic and sub-Antarctic seafloor. However, their diversity in the Southern Ocean is likely underestimated. Phylogenetic analyses of mitochondrial and nuclear DNA markers were integrated with species delimitation approaches as well as morphological colonial and polyps features and skeletal SEM examinations to describe and illustrate three new species within Thouarella, from the Weddell Sea, Southern Ocean: T. amundseni sp. nov., T. dolichoespinosa sp. nov. and T. pseudoislai sp. nov. Our species delimitation results suggest, for the first time, the potential presence of Antarctic and sub-Antarctic cryptic species of primnoids, based on the likely presence of sibling species within T. undulata and T. crenelata. With the three new species here described, the global diversity of Thouarella has increased to 41 species, 15 of which are endemic to the Antarctic and sub-Antarctic waters. Consequently, our results provide new steps for uncovering the shelf benthonic macrofauna’s hidden diversity in the Southern Ocean. Finally, we recommend using an integrative taxonomic framework in this group of organisms and species delimitation approaches because the distinctions between some Thouarella species based only on a superficial examination of their macro- and micromorphological features is, in many cases, limited.
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19
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Coleine C, Stajich JE, de Los Ríos A, Selbmann L. Beyond the extremes: Rocks as ultimate refuge for fungi in drylands. Mycologia 2020; 113:108-133. [PMID: 33232202 DOI: 10.1080/00275514.2020.1816761] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
In an era of rapid climate change and expansion of desertification, the extremely harsh conditions of drylands are a true challenge for microbial life. Under drought conditions, where most life forms cannot survive, rocks represent the main refuge for life. Indeed, the endolithic habitat provides thermal buffering, physical stability, and protection against incident ultraviolet (UV) radiation and solar radiation and, to some extent, ensures water retention to microorganisms. The study of these highly specialized extreme-tolerant and extremophiles may provide tools for understanding microbial interactions and processes that allow them to keep their metabolic machinery active under conditions of dryness and oligotrophy that are typically incompatible with active life, up to the dry limits for life. Despite lithobiontic communities being studied all over the world, a comprehensive understanding of their ecology, evolution, and adaptation is still nascent. Herein, we survey the fungal component of these microbial ecosystems. We first provide an overview of the main defined groups (i.e., lichen-forming fungi, black fungi, and yeasts) of the most known and studied Antarctic endolithic communities that are almost the only life forms ensuring ecosystem functionality in the ice-free areas of the continent. For each group, we discuss their main traits and their diversity. Then, we focus on the fungal taxonomy and ecology of other worldwide endolithic communities. Finally, we highlight the utmost importance of a global rock survey in order to have a comprehensive view of the diversity, distribution, and functionality of these fungi in drylands, to obtain tools in desert area management, and as early alarm systems to climate change.
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Affiliation(s)
- Claudia Coleine
- Department of Ecological and Biological Sciences, University of Tuscia , Largo dell'Università snc, 01100, Viterbo, Italy
| | - Jason E Stajich
- Department of Microbiology and Plant Pathology, University of California, 900 University Ave , Riverside, California 92521
| | - Asunción de Los Ríos
- Department of Biogeochemistry and Microbial Ecology, Museo Nacional de Ciencias Naturales, Spanish National Resource Council, Madrid, Spain
| | - Laura Selbmann
- Department of Ecological and Biological Sciences, University of Tuscia , Largo dell'Università snc, 01100, Viterbo, Italy.,Italian National Antarctic Museum, Mycological Section, Genoa, Italy
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20
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Zaccara S, Patiño J, Convey P, Vanetti I, Cannone N. Multiple colonization and dispersal events hide the early origin and induce a lack of genetic structure of the moss Bryum argenteum in Antarctica. Ecol Evol 2020; 10:8959-8975. [PMID: 32884671 PMCID: PMC7452785 DOI: 10.1002/ece3.6601] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2020] [Revised: 06/24/2020] [Accepted: 06/26/2020] [Indexed: 11/16/2022] Open
Abstract
The dispersal routes of taxa with transoceanic disjunctions remain poorly understood, with the potential roles of Antarctica not yet demonstrated. Mosses are suitable organisms to test direct intra-Antarctic dispersal, as major component of the extant Antarctic flora, with the cosmopolitan moss Bryum argenteum as ideal target species. We analyzed the genetic structure of B. argenteum to provide an evolutionary time frame for its radiation and shed light into its historical biogeography in the Antarctic region. We tested two alternative scenarios: (a) intra-Antarctic panmixia and (b) intra-Antarctic genetic differentiation. Furthermore, we tested for evidence of the existence of specific intra-Antarctic dispersal routes. Sixty-seven new samples (40 collected in Antarctica) were sequenced for ITS nrDNA and rps4 cpDNA regions, and phylogenetic trees of B. argenteum were constructed, with a focus on its Southern Hemisphere. Combining our new nrDNA dataset with previously published datasets, we estimated time-calibrated phylogenies based on two different substitution rates (derived from angiosperms and bryophytes) along with ancestral area estimations. Minimum spanning network and pairwise genetic distances were also calculated. B. argenteum was potentially distributed across Africa and Antarctica soon after its origin. Its earliest intra-Antarctic dispersal and diversification occurred during a warming period in the Pliocene. On the same timescale, a radiation took place involving a dispersal event from Antarctica to the sub-Antarctic islands. A more recent event of dispersal and diversification within Antarctica occurred during a warm period in the Pleistocene, creating favorable conditions also for its colonization outside the Antarctic continent worldwide. We provide evidence supporting the hypothesis that contemporary populations of B. argenteum in Antarctica integrate a history of both multiple long-range dispersal events and local persistence combined with in situ diversification. Our data support the hypothesis that B. argenteum has been characterized by strong connectivity within Antarctica, suggesting the existence of intra-Antarctic dispersal routes.
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Affiliation(s)
- Serena Zaccara
- Department of Theoretical and Applied SciencesInsubria UniversityVareseVAItaly
| | - Jairo Patiño
- Plant Conservation and BiogeographyDepartamento de BotánicaEcología y Fisiología VegetalUniversidad de La LagunaLa LagunaSpain
| | - Peter Convey
- British Antarctic SurveyNatural Environment Research CouncilHigh CrossCambridgeUK
| | - Isabella Vanetti
- Department of Theoretical and Applied SciencesInsubria UniversityVareseVAItaly
| | - Nicoletta Cannone
- Department of Science and High TechnologyInsubria UniversityComoCOItaly
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21
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Ruiz MB, Taverna A, Servetto N, Sahade R, Held C. Hidden diversity in Antarctica: Molecular and morphological evidence of two different species within one of the most conspicuous ascidian species. Ecol Evol 2020; 10:8127-8143. [PMID: 32788966 PMCID: PMC7417227 DOI: 10.1002/ece3.6504] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2020] [Revised: 05/27/2020] [Accepted: 06/03/2020] [Indexed: 12/16/2022] Open
Abstract
The Southern Ocean is one of the most isolated marine ecosystems, characterized by high levels of endemism, diversity, and biomass. Ascidians are among the dominant groups in Antarctic benthic assemblages; thus, recording the evolutionary patterns of this group is crucial to improve our current understanding of the assembly of this polar ocean. We studied the genetic variation within Cnemidocarpa verrucosa sensu lato, one of the most widely distributed abundant and studied ascidian species in Antarctica. Using a mitochondrial and a nuclear gene (COI and 18S), the phylogeography of fifteen populations distributed along the West Antarctic Peninsula and Burdwood Bank/MPA Namuncurá (South American shelf) was characterized, where the distribution of the genetic distance suggested the existence of, at least, two species within nominal C. verrucosa. When reevaluating morphological traits to distinguish between genetically defined species, the presence of a basal disk in one of the genotypes could be a diagnostic morphological trait to differentiate the species. These results are surprising due to the large research that has been carried out with the conspicuous C. verrucosa with no differentiation between species. Furthermore, it provides important tools to distinguish species in the field and laboratory. But also, these results give new insights into patterns of differentiation between closely related species that are distributed in sympatry, where the permeability of species boundaries still needs to be well understood.
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Affiliation(s)
- Micaela B. Ruiz
- Instituto de Diversidad y Ecología Animal (IDEA)Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)CórdobaArgentina
- Facultad de Ciencias Exactas Físicas y NaturalesDepartamento de Diversidad Biológica y Ecología, Ecología MarinaUniversidad Nacional de CórdobaCórdobaArgentina
| | - Anabela Taverna
- Instituto de Diversidad y Ecología Animal (IDEA)Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)CórdobaArgentina
- Facultad de Ciencias Exactas Físicas y NaturalesDepartamento de Diversidad Biológica y Ecología, Ecología MarinaUniversidad Nacional de CórdobaCórdobaArgentina
| | - Natalia Servetto
- Instituto de Diversidad y Ecología Animal (IDEA)Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)CórdobaArgentina
- Facultad de Ciencias Exactas Físicas y NaturalesDepartamento de Diversidad Biológica y Ecología, Ecología MarinaUniversidad Nacional de CórdobaCórdobaArgentina
| | - Ricardo Sahade
- Instituto de Diversidad y Ecología Animal (IDEA)Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)CórdobaArgentina
- Facultad de Ciencias Exactas Físicas y NaturalesDepartamento de Diversidad Biológica y Ecología, Ecología MarinaUniversidad Nacional de CórdobaCórdobaArgentina
| | - Christoph Held
- Section Functional Ecology, Evolutionary MacroecologyAlfred Wegener Institute Helmholtz‐Zentrum für Polar‐ und MeeresforschungBremerhavenGermany
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22
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First Complete Wing of a Stem Group Sphenisciform from the Paleocene of New Zealand Sheds Light on the Evolution of the Penguin Flipper. DIVERSITY 2020. [DOI: 10.3390/d12020046] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
We describe a partial skeleton of a stem group penguin from the Waipara Greensand in New Zealand, which is tentatively assigned to Muriwaimanu tuatahi. The fossil includes the first complete wing of a Paleocene penguin and informs on previously unknown features of the mandible and tibiotarsus of small-sized Sphenisciformes from the Waipara Greensand. The wing is distinguished by important features from that of all geologically younger Sphenisciformes and documents an early stage in the evolution of wing-propelled diving in penguins. In particular, the wing of the new fossil exhibits a well-developed alular phalanx and the distal phalanges are not flattened. Because the wing phalanges resemble those of volant birds, we consider it likely that the wing feathers remained differentiated into functional categories and were not short and scale-like as they are in extant penguins. Even though the flippers of geologically younger penguins may favor survival in extremely cold climates, they are likely to have been shaped by hydrodynamic demands. Possible selective drivers include a diminished importance of the hindlimbs in subaquatic propulsion, new foraging strategies (the caudal end of the mandible of the new fossil distinctly differs from that of extant penguins), or increased predation by marine mammals.
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23
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Foote AD, Martin MD, Louis M, Pacheco G, Robertson KM, Sinding MHS, Amaral AR, Baird RW, Baker CS, Ballance L, Barlow J, Brownlow A, Collins T, Constantine R, Dabin W, Dalla Rosa L, Davison NJ, Durban JW, Esteban R, Ferguson SH, Gerrodette T, Guinet C, Hanson MB, Hoggard W, Matthews CJD, Samarra FIP, de Stephanis R, Tavares SB, Tixier P, Totterdell JA, Wade P, Excoffier L, Gilbert MTP, Wolf JBW, Morin PA. Killer whale genomes reveal a complex history of recurrent admixture and vicariance. Mol Ecol 2019; 28:3427-3444. [PMID: 31131963 DOI: 10.1111/mec.15099] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2019] [Revised: 04/06/2019] [Accepted: 04/08/2019] [Indexed: 02/06/2023]
Abstract
Reconstruction of the demographic and evolutionary history of populations assuming a consensus tree-like relationship can mask more complex scenarios, which are prevalent in nature. An emerging genomic toolset, which has been most comprehensively harnessed in the reconstruction of human evolutionary history, enables molecular ecologists to elucidate complex population histories. Killer whales have limited extrinsic barriers to dispersal and have radiated globally, and are therefore a good candidate model for the application of such tools. Here, we analyse a global data set of killer whale genomes in a rare attempt to elucidate global population structure in a nonhuman species. We identify a pattern of genetic homogenisation at lower latitudes and the greatest differentiation at high latitudes, even between currently sympatric lineages. The processes underlying the major axis of structure include high drift at the edge of species' range, likely associated with founder effects and allelic surfing during postglacial range expansion. Divergence between Antarctic and non-Antarctic lineages is further driven by ancestry segments with up to four-fold older coalescence time than the genome-wide average; relicts of a previous vicariance during an earlier glacial cycle. Our study further underpins that episodic gene flow is ubiquitous in natural populations, and can occur across great distances and after substantial periods of isolation between populations. Thus, understanding the evolutionary history of a species requires comprehensive geographic sampling and genome-wide data to sample the variation in ancestry within individuals.
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Affiliation(s)
- Andrew D Foote
- CMPG, Institute of Ecology and Evolution, University of Bern, Bern, Switzerland
| | | | - Marie Louis
- Department of Biology, Section for Evolutionary Genomics, University of Copenhagen, Copenhagen, Denmark.,Scottish Oceans Institute, East Sands, University of St. Andrews, St. Andrews, UK
| | - George Pacheco
- Department of Biology, Section for Evolutionary Genomics, University of Copenhagen, Copenhagen, Denmark
| | - Kelly M Robertson
- Marine Mammal and Turtle Division, National Marine Fisheries Service, National Oceanographic and Atmospheric Administration, Southwest Fisheries Science Center, La Jolla, California
| | - Mikkel-Holger S Sinding
- Department of Biology, Section for Evolutionary Genomics, University of Copenhagen, Copenhagen, Denmark.,Greenland Institute of Natural Resources, Nuuk, Greenland
| | - Ana R Amaral
- American Museum of Natural History, New York City, New York.,Faculdade de Ciências Universidade de Lisboa, Centre for Ecology, Evolution and Environmental Changes, Lisboa, Portugal
| | | | - Charles Scott Baker
- Department of Fisheries and Wildlife, Marine Mammal Institute, Oregon State University, Newport, Oregon.,School of Biological Sciences, University of Auckland, Auckland, New Zealand
| | - Lisa Ballance
- Marine Mammal and Turtle Division, National Marine Fisheries Service, National Oceanographic and Atmospheric Administration, Southwest Fisheries Science Center, La Jolla, California
| | - Jay Barlow
- Marine Mammal and Turtle Division, National Marine Fisheries Service, National Oceanographic and Atmospheric Administration, Southwest Fisheries Science Center, La Jolla, California
| | - Andrew Brownlow
- Scottish Marine Animal Stranding Scheme, SRUC Veterinary Services Drummondhill, Inverness, UK
| | - Tim Collins
- Ocean Giants Program, Wildlife Conservation Society, New York City, New York
| | | | - Willy Dabin
- Observatoire Pelagis, Université de La Rochelle-CNRS, La Rochelle, France
| | - Luciano Dalla Rosa
- Laboratório de Ecologia e Conservação da Megafauna Marinha, Instituto de Oceanografia, Universidade Federal do Rio Grande, Rio Grande, Brazil
| | - Nicholas J Davison
- Scottish Marine Animal Stranding Scheme, SRUC Veterinary Services Drummondhill, Inverness, UK
| | - John W Durban
- Marine Mammal and Turtle Division, National Marine Fisheries Service, National Oceanographic and Atmospheric Administration, Southwest Fisheries Science Center, La Jolla, California
| | - Ruth Esteban
- CIRCE, Conservation, Information and Research on Cetaceans, Algeciras, Spain
| | | | - Tim Gerrodette
- Marine Mammal and Turtle Division, National Marine Fisheries Service, National Oceanographic and Atmospheric Administration, Southwest Fisheries Science Center, La Jolla, California
| | - Christophe Guinet
- Centre d'Etudes Biologiques de Chizé (CEBC), CNRS-ULR, UMR, Chizé, France
| | - M Bradley Hanson
- National Marine Fisheries Service, National Oceanic and Atmospheric Administration, Northwest Fisheries Science Center, Seattle, Washington
| | - Wayne Hoggard
- National Marine Fisheries Service, NOAA, Southeast Fisheries Science Center, Pascagoula, Mississippi
| | | | | | - Renaud de Stephanis
- CIRCE, Conservation, Information and Research on Cetaceans, Algeciras, Spain
| | - Sara B Tavares
- Scottish Oceans Institute, East Sands, University of St. Andrews, St. Andrews, UK
| | - Paul Tixier
- Centre d'Etudes Biologiques de Chizé (CEBC), CNRS-ULR, UMR, Chizé, France.,School of Life and Environmental Sciences (Burwood Campus), Deakin University, Geelong, Victoria, Australia
| | - John A Totterdell
- Marine Information and Research Group-Australia (MIRG), Quinns Rocks, Western Australia, Australia
| | - Paul Wade
- National Marine Mammal Laboratory, National Marine Fisheries Service, National Oceanic and Atmospheric Administration, Alaska Fisheries Science Center, Seattle, Washington
| | - Laurent Excoffier
- CMPG, Institute of Ecology and Evolution, University of Bern, Bern, Switzerland
| | - M Thomas P Gilbert
- NTNU University Museum, Trondheim, Norway.,Department of Biology, Section for Evolutionary Genomics, University of Copenhagen, Copenhagen, Denmark
| | - Jochen B W Wolf
- Division of Evolutionary Biology, Faculty of Biology, LMU Munich, Planegg-Martinsried, Germany.,Department of Evolutionary Biology, Science of Life Laboratory, Uppsala University, Uppsala, Sweden
| | - Phillip A Morin
- Marine Mammal and Turtle Division, National Marine Fisheries Service, National Oceanographic and Atmospheric Administration, Southwest Fisheries Science Center, La Jolla, California
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24
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Amarelle V, Carrasco V, Fabiano E. The Hidden Life of Antarctic Rocks. SPRINGER POLAR SCIENCES 2019. [DOI: 10.1007/978-3-030-02786-5_10] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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25
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Zhao H, Li X, Zhang Z, Zhao Y, Chen P, Zhu Y. Drivers and assemblies of soil eukaryotic microbes among different soil habitat types in a semi-arid mountain in China. PeerJ 2018; 6:e6042. [PMID: 30568857 PMCID: PMC6286657 DOI: 10.7717/peerj.6042] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2018] [Accepted: 10/30/2018] [Indexed: 11/30/2022] Open
Abstract
The effects of environmental and species structure on soil eukaryotic microbes inhabiting semi-arid mountains remain unclear. Furthermore, whether community assembly differs in a variety of soil habitat types, for example, artificial forest, artificial bush, farmland, and natural grassland, is not well understood. Here, we explored species diversity and composition of soil eukaryotic microbes south of the Taihang Mountains (mid-western region of China) using Illumina sequencing of the 18S rRNA gene (V4) region on the MiSeq platform. The results suggest that the forest soil habitat type improved the diversity and abundance of soil eukaryotic microbes that will benefit the restoration of degraded soil. The SAR (Stramenopiles, Alveolates, Rhizaria) supergroup and Metazoa were the dominant soil eukaryotic microbial groups at the phylum level. About 26% of all operational taxonomic units were common among the different soil habitat types. The O-elements, water content, soil organic matter, and elevation significantly influenced the abundance of soil eukaryote communities (P < 0.05). Our findings provide some reference for the effectiveness of local ecological restoration and the establishment of a soil eukaryotic microbe resource databases in a semi-arid area.
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Affiliation(s)
- He Zhao
- College of Forestry, Henan Agricultural University, Zhengzhou, China
| | - Xuanzhen Li
- College of Forestry, Henan Agricultural University, Zhengzhou, China
| | - Zhiming Zhang
- College of Forestry, Henan Agricultural University, Zhengzhou, China
| | - Yong Zhao
- College of Forestry, Henan Agricultural University, Zhengzhou, China
| | - Peng Chen
- College of Forestry, Henan Agricultural University, Zhengzhou, China
| | - Yiwei Zhu
- College of Forestry, Henan Agricultural University, Zhengzhou, China
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26
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Halanych KM, Mahon AR. Challenging Dogma Concerning Biogeographic Patterns of Antarctica and the Southern Ocean. ANNUAL REVIEW OF ECOLOGY EVOLUTION AND SYSTEMATICS 2018. [DOI: 10.1146/annurev-ecolsys-121415-032139] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Antarctica is enormous, cold, remote, and particularly sensitive to climate change. Most biological research below 60°S has focused on the isolated nature of the biota and how organisms have adapted to the cold and ice. However, biogeographic patterns in Antarctica and the Southern Ocean, and the processes explaining how those patterns came about, still await adequate explanation. Both terrestrial and marine organisms have been influenced by climatic change (e.g., glaciation), physical phenomena (e.g., oceanic currents), and/or potential barriers to gene flow (e.g., steep thermal gradients). Whereas the Antarctic region contains diverse and complex marine communities, terrestrial systems tend to be comparatively simple with limited diversity. Here, we challenge the current dogma used to explain the diversity and biogeographic patterns present in the Antarctic. We assert that relatively modern processes within the last few million years, rather than geo-logical events that occurred in the Eocene and Miocene, account for present patterns of biodiversity in the region. Additionally, reproductive life history stages appear to have little influence in structuring genetic patterns in the Antarctic, as currents and glacial patterns are noted to be more important drivers of organismal patterns of distribution. Finally, we highlight the need for additional sampling, high-throughput genomic approaches, and broad, multinational cooperation for addressing outstanding questions of Antarctic biogeography and biodiversity.
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Affiliation(s)
- Kenneth M. Halanych
- Molette Biology Laboratory for Environmental and Climate Change Studies, Department of Biological Sciences, Auburn University, Auburn, Alabama 36849, USA
| | - Andrew R. Mahon
- Department of Biology, Central Michigan University, Mount Pleasant, Michigan 48859, USA
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27
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Leiva C, Riesgo A, Avila C, Rouse GW, Taboada S. Population structure and phylogenetic relationships of a new shallow-water Antarctic phyllodocid annelid. ZOOL SCR 2018. [DOI: 10.1111/zsc.12313] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Carlos Leiva
- Department of Genetics Microbiology and Statistics, Facultat de Biologia; Universitat de Barcelona; Barcelona Spain
- Department of Life Sciences; Natural History Museum of London; London UK
| | - Ana Riesgo
- Department of Life Sciences; Natural History Museum of London; London UK
| | - Conxita Avila
- Department of Evolutionary Biology, Ecology, and Environmental Sciences; Facultat de Biologia, Universitat de Barcelona; Barcelona Spain
| | - Greg W. Rouse
- MBRD; Scripps Institution of Oceanography; La Jolla California
| | - Sergi Taboada
- Department of Life Sciences; Natural History Museum of London; London UK
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28
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Núñez-Pons L, Avila C, Romano G, Verde C, Giordano D. UV-Protective Compounds in Marine Organisms from the Southern Ocean. Mar Drugs 2018; 16:E336. [PMID: 30223486 PMCID: PMC6165330 DOI: 10.3390/md16090336] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2018] [Revised: 09/03/2018] [Accepted: 09/12/2018] [Indexed: 12/20/2022] Open
Abstract
Solar radiation represents a key abiotic factor in the evolution of life in the oceans. In general, marine, biota-particularly in euphotic and dysphotic zones-depends directly or indirectly on light, but ultraviolet radiation (UV-R) can damage vital molecular machineries. UV-R induces the formation of reactive oxygen species (ROS) and impairs intracellular structures and enzymatic reactions. It can also affect organismal physiologies and eventually alter trophic chains at the ecosystem level. In Antarctica, physical drivers, such as sunlight, sea-ice, seasonality and low temperature are particularly influencing as compared to other regions. The springtime ozone depletion over the Southern Ocean makes organisms be more vulnerable to UV-R. Nonetheless, Antarctic species seem to possess analogous UV photoprotection and repair mechanisms as those found in organisms from other latitudes. The lack of data on species-specific responses towards increased UV-B still limits the understanding about the ecological impact and the tolerance levels related to ozone depletion in this region. The photobiology of Antarctic biota is largely unknown, in spite of representing a highly promising reservoir in the discovery of novel cosmeceutical products. This review compiles the most relevant information on photoprotection and UV-repair processes described in organisms from the Southern Ocean, in the context of this unique marine polar environment.
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Affiliation(s)
- Laura Núñez-Pons
- Department of Biology and Evolution of Marine Organisms (BEOM), Stazione Zoologica Anton Dohrn (SZN), 80121 Villa Comunale, Napoli, Italy.
| | - Conxita Avila
- Department of Evolutionary Biology, Ecology, and Environmental Sciences, and Biodiversity Research Institute (IrBIO), Faculty of Biology, University of Barcelona, Av. Diagonal 643, 08028 Barcelona, Catalonia, Spain.
| | - Giovanna Romano
- Department of Marine Biotechnology (Biotech), Stazione Zoologica Anton Dohrn (SZN), 80121 Villa Comunale, Napoli, Italia.
| | - Cinzia Verde
- Department of Biology and Evolution of Marine Organisms (BEOM), Stazione Zoologica Anton Dohrn (SZN), 80121 Villa Comunale, Napoli, Italy.
- Institute of Biosciences and BioResources (IBBR), CNR, Via Pietro Castellino 111, 80131 Napoli, Italy.
| | - Daniela Giordano
- Department of Biology and Evolution of Marine Organisms (BEOM), Stazione Zoologica Anton Dohrn (SZN), 80121 Villa Comunale, Napoli, Italy.
- Institute of Biosciences and BioResources (IBBR), CNR, Via Pietro Castellino 111, 80131 Napoli, Italy.
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29
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Ritchie H, Jamieson AJ, Piertney SB. Genome size variation in deep-sea amphipods. ROYAL SOCIETY OPEN SCIENCE 2017; 4:170862. [PMID: 28989783 PMCID: PMC5627123 DOI: 10.1098/rsos.170862] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/07/2017] [Accepted: 08/16/2017] [Indexed: 06/07/2023]
Abstract
Genome size varies considerably across taxa, and extensive research effort has gone into understanding whether variation can be explained by differences in key ecological and life-history traits among species. The extreme environmental conditions that characterize the deep sea have been hypothesized to promote large genome sizes in eukaryotes. Here we test this supposition by examining genome sizes among 13 species of deep-sea amphipods from the Mariana, Kermadec and New Hebrides trenches. Genome sizes were estimated using flow cytometry and found to vary nine-fold, ranging from 4.06 pg (4.04 Gb) in Paralicella caperesca to 34.79 pg (34.02 Gb) in Alicella gigantea. Phylogenetic independent contrast analysis identified a relationship between genome size and maximum body size, though this was largely driven by those species that display size gigantism. There was a distinct shift in the genome size trait diversification rate in the supergiant amphipod A. gigantea relative to the rest of the group. The variation in genome size observed is striking and argues against genome size being driven by a common evolutionary history, ecological niche and life-history strategy in deep-sea amphipods.
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Affiliation(s)
- H. Ritchie
- Institute of Biological and Environmental Sciences, University of Aberdeen, Zoology Building, Aberdeen AB24 2TZ, UK
| | - A. J. Jamieson
- Oceanlab, University of Aberdeen, Newburgh, Aberdeenshire AB41 6AA, UK
| | - S. B. Piertney
- Institute of Biological and Environmental Sciences, University of Aberdeen, Zoology Building, Aberdeen AB24 2TZ, UK
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30
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Moon KL, Chown SL, Fraser CI. Reconsidering connectivity in the sub-Antarctic. Biol Rev Camb Philos Soc 2017; 92:2164-2181. [DOI: 10.1111/brv.12327] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2016] [Revised: 02/09/2017] [Accepted: 02/15/2017] [Indexed: 12/21/2022]
Affiliation(s)
- Katherine L. Moon
- School of Biological Sciences; Monash University; Clayton 3800 Australia
- Fenner School of Environment and Society; Australian National University; Acton 2601 Australia
| | - Steven L. Chown
- School of Biological Sciences; Monash University; Clayton 3800 Australia
| | - Ceridwen I. Fraser
- Fenner School of Environment and Society; Australian National University; Acton 2601 Australia
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31
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Evolutionary genomics of the cold-adapted diatom Fragilariopsis cylindrus. Nature 2017; 541:536-540. [PMID: 28092920 DOI: 10.1038/nature20803] [Citation(s) in RCA: 193] [Impact Index Per Article: 27.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2016] [Accepted: 11/16/2016] [Indexed: 01/21/2023]
Abstract
The Southern Ocean houses a diverse and productive community of organisms. Unicellular eukaryotic diatoms are the main primary producers in this environment, where photosynthesis is limited by low concentrations of dissolved iron and large seasonal fluctuations in light, temperature and the extent of sea ice. How diatoms have adapted to this extreme environment is largely unknown. Here we present insights into the genome evolution of a cold-adapted diatom from the Southern Ocean, Fragilariopsis cylindrus, based on a comparison with temperate diatoms. We find that approximately 24.7 per cent of the diploid F. cylindrus genome consists of genetic loci with alleles that are highly divergent (15.1 megabases of the total genome size of 61.1 megabases). These divergent alleles were differentially expressed across environmental conditions, including darkness, low iron, freezing, elevated temperature and increased CO2. Alleles with the largest ratio of non-synonymous to synonymous nucleotide substitutions also show the most pronounced condition-dependent expression, suggesting a correlation between diversifying selection and allelic differentiation. Divergent alleles may be involved in adaptation to environmental fluctuations in the Southern Ocean.
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32
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Czechowski P, White D, Clarke L, McKay A, Cooper A, Stevens MI. Age-related environmental gradients influence invertebrate distribution in the Prince Charles Mountains, East Antarctica. ROYAL SOCIETY OPEN SCIENCE 2016; 3:160296. [PMID: 28083092 PMCID: PMC5210674 DOI: 10.1098/rsos.160296] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2016] [Accepted: 11/17/2016] [Indexed: 05/22/2023]
Abstract
The potential impact of environmental change on terrestrial Antarctic ecosystems can be explored by inspecting biodiversity patterns across large-scale gradients. Unfortunately, morphology-based surveys of Antarctic invertebrates are time-consuming and limited by the cryptic nature of many taxa. We used biodiversity information derived from high-throughput sequencing (HTS) to elucidate the relationship between soil properties and invertebrate biodiversity in the Prince Charles Mountains, East Antarctica. Across 136 analysed soil samples collected from Mount Menzies, Mawson Escarpment and Lake Terrasovoje, we found invertebrate distribution in the Prince Charles Mountains significantly influenced by soil salinity and/or sulfur content. Phyla Tardigrada and Arachnida occurred predominantly in low-salinity substrates with abundant nutrients, whereas Bdelloidea (Rotifera) and Chromadorea (Nematoda) were more common in highly saline substrates. A significant correlation between invertebrate occurrence, soil salinity and time since deglaciation indicates that terrain age indirectly influences Antarctic terrestrial biodiversity, with more recently deglaciated areas supporting greater diversity. Our study demonstrates the value of HTS metabarcoding to investigate environmental constraints on inconspicuous soil biodiversity across large spatial scales.
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Affiliation(s)
- Paul Czechowski
- Australian Centre for Ancient DNA, University of Adelaide, Adelaide, South Australia 5005, Australia
- Antarctic Biological Research Initiative, Bolivar, South Australia 5110, Australia
- Author for correspondence: Paul Czechowski e-mail:
| | - Duanne White
- Institute for Applied Ecology, University of Canberra, Canberra, Australian Capital Territory 2601, Australia
| | - Laurence Clarke
- Australian Centre for Ancient DNA, University of Adelaide, Adelaide, South Australia 5005, Australia
- Australian Antarctic Division, Kingston, Tasmania 7050, Australia
- Antarctic Climate and Ecosystems Cooperative Research Centre, University of Tasmania, Hobart, Tasmania 7001, Australia
| | - Alan McKay
- Plant and Soil Health, South Australian Research and Development Institute, Waite Campus, Urrbrae, South Australia 5064, Australia
| | - Alan Cooper
- Australian Centre for Ancient DNA, University of Adelaide, Adelaide, South Australia 5005, Australia
| | - Mark I. Stevens
- South Australian Museum, Science Centre, Adelaide, South Australia 5000, Australia
- School of Pharmacy and Medical Sciences, University of South Australia, Adelaide, South Australia 5001, Australia
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33
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Peixoto RJM, Miranda KR, Lobo LA, Granato A, de Carvalho Maalouf P, de Jesus HE, Rachid CTCC, Moraes SR, Dos Santos HF, Peixoto RS, Rosado AS, Domingues RMCP. Antarctic strict anaerobic microbiota from Deschampsia antarctica vascular plants rhizosphere reveals high ecology and biotechnology relevance. Extremophiles 2016; 20:875-884. [PMID: 27709303 DOI: 10.1007/s00792-016-0878-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2016] [Accepted: 09/24/2016] [Indexed: 12/21/2022]
Abstract
The Antarctic soil microbial community has a crucial role in the growth and stabilization of higher organisms, such as vascular plants. Analysis of the soil microbiota composition in that extreme environmental condition is crucial to understand the ecological importance and biotechnological potential. We evaluated the efficiency of isolation and abundance of strict anaerobes in the vascular plant Deschampsia antarctica rhizosphere collected in the Antarctic's Admiralty Bay and associated biodiversity to metabolic perspective and enzymatic activity. Using anaerobic cultivation methods, we identified and isolated a range of microbial taxa whose abundance was associated with Plant Growth-Promoting Bacteria (PGPB) and presences were exclusively endemic to the Antarctic continent. Firmicutes was the most abundant phylum (73 %), with the genus Clostridium found as the most isolated taxa. Here, we describe two soil treatments (oxygen gradient and heat shock) and 27 physicochemical culture conditions were able to increase the diversity of anaerobic bacteria isolates. Heat shock treatment allowed to isolate a high percentage of new species (63.63 %), as well as isolation of species with high enzymatic activity (80.77 %), which would have potential industry application. Our findings contribute to the understanding of the role of anaerobic microbes regarding ecology, evolutionary, and biotechnological features essential to the Antarctic ecosystem.
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Affiliation(s)
- Rafael José Marques Peixoto
- Laboratório de Biologia dos Anaeróbios, Departamento de Microbiologia Médica, Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Avenida Carlos Chagas Filho, 373. Ilha do Fundão, CCS, bloco I, IMPG, 2o andar, Rio de Janeiro, CEP 21941-902, Brazil.
| | - Karla Rodrigues Miranda
- Laboratório de Biologia dos Anaeróbios, Departamento de Microbiologia Médica, Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Avenida Carlos Chagas Filho, 373. Ilha do Fundão, CCS, bloco I, IMPG, 2o andar, Rio de Janeiro, CEP 21941-902, Brazil
| | - Leandro Araujo Lobo
- Laboratório de Biologia dos Anaeróbios, Departamento de Microbiologia Médica, Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Avenida Carlos Chagas Filho, 373. Ilha do Fundão, CCS, bloco I, IMPG, 2o andar, Rio de Janeiro, CEP 21941-902, Brazil
| | - Alessandra Granato
- Laboratório Integrado de Imunologia, Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | | | - Hugo Emiliano de Jesus
- Laboratório de Ecologia Microbiana Molecular, Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Caio T C C Rachid
- Laboratório de Ecologia Microbiana Molecular, Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Saulo Roni Moraes
- Universidade Severino Sombra, Vassouras, Rio de Janeiro, Brazil.,Universidade Veiga de Almeida, Rio de Janeiro, Brazil
| | - Henrique Fragoso Dos Santos
- Laboratório de Ecologia Microbiana Molecular, Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Raquel Silva Peixoto
- Laboratório de Ecologia Microbiana Molecular, Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Alexandre Soares Rosado
- Laboratório de Ecologia Microbiana Molecular, Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Regina Maria Cavalcanti Pilotto Domingues
- Laboratório de Biologia dos Anaeróbios, Departamento de Microbiologia Médica, Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Avenida Carlos Chagas Filho, 373. Ilha do Fundão, CCS, bloco I, IMPG, 2o andar, Rio de Janeiro, CEP 21941-902, Brazil
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Verheye ML, Backeljau T, d’Udekem d’Acoz C. Looking beneath the tip of the iceberg: diversification of the genus Epimeria on the Antarctic shelf (Crustacea, Amphipoda). Polar Biol 2016. [DOI: 10.1007/s00300-016-1910-5] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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35
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Basher Z, Costello MJ. The past, present and future distribution of a deep-sea shrimp in the Southern Ocean. PeerJ 2016; 4:e1713. [PMID: 26925334 PMCID: PMC4768674 DOI: 10.7717/peerj.1713] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2015] [Accepted: 01/29/2016] [Indexed: 01/22/2023] Open
Abstract
Shrimps have a widespread distribution across the shelf, slope and seamount regions of the Southern Ocean. Studies of Antarctic organisms have shown that individual species and higher taxa display different degrees of sensitivity and adaptability in response to environmental change. We use species distribution models to predict changes in the geographic range of the deep-sea Antarctic shrimp Nematocarcinus lanceopes under changing climatic conditions from the Last Glacial Maximum to the present and to the year 2100. The present distribution range indicates a pole-ward shift of the shrimp population since the last glaciation. This occurred by colonization of slopes from nearby refugia located around the northern part of Scotia Arc, southern tip of South America, South Georgia, Bouvet Island, southern tip of the Campbell plateau and Kerguelen plateau. By 2100, the shrimp are likely to expand their distribution in east Antarctica but have a continued pole-ward contraction in west Antarctica. The range extension and contraction process followed by the deep-sea shrimp provide a geographic context of how other deep-sea Antarctic species may have survived during the last glaciation and may endure with projected changing climatic conditions in the future.
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Affiliation(s)
- Zeenatul Basher
- Institute of Marine Science, Leigh Marine Laboratory, The University of Auckland, Auckland, New Zealand
| | - Mark J. Costello
- Institute of Marine Science, Leigh Marine Laboratory, The University of Auckland, Auckland, New Zealand
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36
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Sleight VA, Thorne MAS, Peck LS, Arivalagan J, Berland S, Marie A, Clark MS. Characterisation of the mantle transcriptome and biomineralisation genes in the blunt-gaper clam, Mya truncata. Mar Genomics 2016; 27:47-55. [PMID: 26777791 DOI: 10.1016/j.margen.2016.01.003] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2015] [Revised: 12/28/2015] [Accepted: 01/07/2016] [Indexed: 12/16/2022]
Abstract
Members of the Myidae family are ecologically and economically important, but there is currently very little molecular data on these species. The present study sequenced and assembled the mantle transcriptome of Mya truncata from the North West coast of Scotland and identified candidate biomineralisation genes. RNA-Seq reads were assembled to create 20,106 contigs in a de novo transciptome, 18.81% of which were assigned putative functions using BLAST sequence similarity searching (cuttoff E-value 1E-10). The most highly expressed genes were compared to the Antarctic clam (Laternula elliptica) and showed that many of the dominant biological functions (muscle contraction, energy production, biomineralisation) in the mantle were conserved. There were however, differences in the constitutive expression of heat shock proteins, which were possibly due to the M. truncata sampling location being at a relatively low latitude, and hence relatively warm, in terms of the global distribution of the species. Phylogenetic analyses of the Tyrosinase proteins from M. truncata showed a gene expansion which was absent in L. elliptica. The tissue distribution expression patterns of putative biomineralisation genes were investigated using quantitative PCR, all genes showed a mantle specific expression pattern supporting their hypothesised role in shell secretion. The present study provides some preliminary insights into how clams from different environments - temperate versus polar - build their shells. In addition, the transcriptome data provides a valuable resource for future comparative studies investigating biomineralisation.
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Affiliation(s)
- Victoria A Sleight
- British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge CB3 0ET, UK.
| | - Michael A S Thorne
- British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge CB3 0ET, UK
| | - Lloyd S Peck
- British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge CB3 0ET, UK
| | - Jaison Arivalagan
- UMR 7245 CNRS/MNHN Molécules de Communications et Adaptations des Micro-organismes, Sorbonne Universités, Muséum National d'Histoire Naturelle, Paris 75005, France; UMR 7208 CNRS/MNHN/UPMC/IRD Biologie des Organismes Aquatiques et Ecosystèmes, Sorbonne Universités, Muséum National d'Histoire Naturelle, Paris 75005, France
| | - Sophie Berland
- UMR 7245 CNRS/MNHN Molécules de Communications et Adaptations des Micro-organismes, Sorbonne Universités, Muséum National d'Histoire Naturelle, Paris 75005, France
| | - Arul Marie
- UMR 7208 CNRS/MNHN/UPMC/IRD Biologie des Organismes Aquatiques et Ecosystèmes, Sorbonne Universités, Muséum National d'Histoire Naturelle, Paris 75005, France
| | - Melody S Clark
- British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge CB3 0ET, UK
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37
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Introduction to the special issue on the Life in Antarctica: Boundaries and Gradients in a Changing Environment (XIth SCAR Biology Symposium). Polar Biol 2015. [DOI: 10.1007/s00300-015-1852-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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38
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Rogers AD, Yesson C, Gravestock P. A Biophysical and Economic Profile of South Georgia and the South Sandwich Islands as Potential Large-Scale Antarctic Protected Areas. ADVANCES IN MARINE BIOLOGY 2015; 70:1-286. [PMID: 26296718 DOI: 10.1016/bs.amb.2015.06.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The current hiatus in the establishment of a network of marine protected areas (MPAs) in the Antarctic means that other routes to conservation are required. The protection of overseas territories in the Antarctic and sub-Antarctic represents one way to advance the initiation of such a network. This review of the physical and biological features of the United Kingdom (U.K.) overseas territories of South Georgia and South Sandwich Islands (SGSSI) is undertaken to estimate the importance of the islands in terms of marine conservation in the Southern Ocean and globally. The economy and management of SGSSI are also analysed, and the question of whether the islands already have sufficient protection to constitute part of an Antarctic network of MPAs is assessed. The SGSSI comprise unique geological and physical features, a diverse marine biota, including a significant proportion of endemic species and globally important breeding populations of marine predators. Regardless of past exploitation of biotic resources, such as seals, whales and finfish, SGSSI would make a significant contribution to biological diversity in an Antarctic network of MPAs. At present, conservation measures do not adequately protect all of the biological features that render the islands so important in terms of conservation at a regional and global level. However, a general lack of data on Antarctic marine ecosystems (particularly needed for SGSSSI) makes it difficult to assess this fully. One barrier to achieving more complete protection is the continuing emphasis on fishing effort in these waters by U.K. government. Other non-U.K. Antarctic overseas territories of conservation importance are also compromised as MPAs because of the exploitation of fisheries resources in their waters. The possible non-use values of SGSSI as well as the importance of ecosystem services that are indirectly used by people are outlined in this review. Technology is improving the potential for management of remote MPAs, particularly in the context of incursion by illegal fishing activities and use of satellite surveillance for enforcement of fisheries and conservation regulations. The conflict between commercial exploitation and conservation of Antarctic marine living resources is explored.
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Affiliation(s)
- Alex D Rogers
- Department of Zoology, University of Oxford, Oxford, United Kingdom.
| | - Christopher Yesson
- Institute of Zoology, Zoological Society of London, London, United Kingdom
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Riesgo A, Taboada S, Avila C. Evolutionary patterns in Antarctic marine invertebrates: an update on molecular studies. Mar Genomics 2015; 23:1-13. [PMID: 26228311 DOI: 10.1016/j.margen.2015.07.005] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2015] [Revised: 07/17/2015] [Accepted: 07/17/2015] [Indexed: 01/08/2023]
Affiliation(s)
- Ana Riesgo
- Department of Animal Biology and Biodiversity Research Institute (IrBIO), Faculty of Biology, Universitat de Barcelona, Av. Diagonal 643, 08028 Barcelona, Catalonia, Spain.
| | - Sergi Taboada
- Department of Animal Biology and Biodiversity Research Institute (IrBIO), Faculty of Biology, Universitat de Barcelona, Av. Diagonal 643, 08028 Barcelona, Catalonia, Spain
| | - Conxita Avila
- Department of Animal Biology and Biodiversity Research Institute (IrBIO), Faculty of Biology, Universitat de Barcelona, Av. Diagonal 643, 08028 Barcelona, Catalonia, Spain
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Cascella K, Jollivet D, Papot C, Léger N, Corre E, Ravaux J, Clark MS, Toullec JY. Diversification, evolution and sub-functionalization of 70kDa heat-shock proteins in two sister species of antarctic krill: differences in thermal habitats, responses and implications under climate change. PLoS One 2015; 10:e0121642. [PMID: 25835552 PMCID: PMC4383606 DOI: 10.1371/journal.pone.0121642] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2014] [Accepted: 02/03/2015] [Indexed: 01/28/2023] Open
Abstract
BACKGROUND A comparative thermal tolerance study was undertaken on two sister species of Euphausiids (Antarctic krills) Euphausia superba and Euphausia crystallorophias. Both are essential components of the Southern Ocean ecosystem, but occupy distinct environmental geographical locations with slightly different temperature regimes. They therefore provide a useful model system for the investigation of adaptations to thermal tolerance. METHODOLOGY/PRINCIPAL FINDING Initial CTmax studies showed that E. superba was slightly more thermotolerant than E. crystallorophias. Five Hsp70 mRNAs were characterized from the RNAseq data of both species and subsequent expression kinetics studies revealed notable differences in induction of each of the 5 orthologues between the two species, with E. crystallorophias reacting more rapidly than E. superba. Furthermore, analyses conducted to estimate the evolutionary rates and selection strengths acting on each gene tended to support the hypothesis that diversifying selection has contributed to the diversification of this gene family, and led to the selective relaxation on the inducible C form with its possible loss of function in the two krill species. CONCLUSIONS The sensitivity of the epipelagic species E. crystallorophias to temperature variations and/or its adaptation to cold is enhanced when compared with its sister species, E. superba. These results indicate that ice krill could be the first of the two species to be impacted by the warming of coastal waters of the Austral ocean in the coming years due to climate change.
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Affiliation(s)
- Kévin Cascella
- Sorbonne Universités, UPMC Université Paris 06, UMR 7144 CNRS, Equipe ABICE, Station Biologique de Roscoff, 29680 Roscoff, France
- CNRS, UMR 7144, Adaptation et Diversité en Milieu Marin, Station Biologique de Roscoff, 29680 Roscoff, France
| | - Didier Jollivet
- Sorbonne Universités, UPMC Université Paris 06, UMR 7144 CNRS, Equipe ABICE, Station Biologique de Roscoff, 29680 Roscoff, France
- CNRS, UMR 7144, Adaptation et Diversité en Milieu Marin, Station Biologique de Roscoff, 29680 Roscoff, France
| | - Claire Papot
- Université de Lille1, CNRS UMR8198, Ecoimmunology of Marine Annelids, 59655 Villeneuve d’Ascq, France
| | - Nelly Léger
- Sorbonne Universités, UPMC Université Paris 06, UMR 7208 CNRS, Equipe AMEX, 75005 Paris, France
- CNRS 7208, BOREA, UPMC Université Paris 06, 75005 Paris, France
| | - Erwan Corre
- Sorbonne Universités, UPMC Université Paris 06, FR 2424 CNRS, ABiMS, Analysis and Bioinformatics for Marine Science, Station Biologique de Roscoff, 29680 Roscoff, France
- CNRS, FR 2424, Station Biologique de Roscoff, 29680 Roscoff, France
| | - Juliette Ravaux
- Sorbonne Universités, UPMC Université Paris 06, UMR 7208 CNRS, Equipe AMEX, 75005 Paris, France
- CNRS 7208, BOREA, UPMC Université Paris 06, 75005 Paris, France
| | - Melody S. Clark
- British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge, CB3 0ET, United Kingdom
| | - Jean-Yves Toullec
- Sorbonne Universités, UPMC Université Paris 06, UMR 7144 CNRS, Equipe ABICE, Station Biologique de Roscoff, 29680 Roscoff, France
- CNRS, UMR 7144, Adaptation et Diversité en Milieu Marin, Station Biologique de Roscoff, 29680 Roscoff, France
- * E-mail:
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Moles J, Figuerola B, Campanyà-Llovet N, Monleón-Getino T, Taboada S, Avila C. Distribution patterns in Antarctic and Subantarctic echinoderms. Polar Biol 2015. [DOI: 10.1007/s00300-014-1640-5] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Convey P, Chown SL, Clarke A, Barnes DKA, Bokhorst S, Cummings V, Ducklow HW, Frati F, Green TGA, Gordon S, Griffiths HJ, Howard-Williams C, Huiskes AHL, Laybourn-Parry J, Lyons WB, McMinn A, Morley SA, Peck LS, Quesada A, Robinson SA, Schiaparelli S, Wall DH. The spatial structure of Antarctic biodiversity. ECOL MONOGR 2014. [DOI: 10.1890/12-2216.1] [Citation(s) in RCA: 232] [Impact Index Per Article: 23.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Brown A, Thatje S. Explaining bathymetric diversity patterns in marine benthic invertebrates and demersal fishes: physiological contributions to adaptation of life at depth. Biol Rev Camb Philos Soc 2014; 89:406-26. [PMID: 24118851 PMCID: PMC4158864 DOI: 10.1111/brv.12061] [Citation(s) in RCA: 92] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2012] [Revised: 08/01/2013] [Accepted: 08/14/2013] [Indexed: 12/01/2022]
Abstract
Bathymetric biodiversity patterns of marine benthic invertebrates and demersal fishes have been identified in the extant fauna of the deep continental margins. Depth zonation is widespread and evident through a transition between shelf and slope fauna from the shelf break to 1000 m, and a transition between slope and abyssal fauna from 2000 to 3000 m; these transitions are characterised by high species turnover. A unimodal pattern of diversity with depth peaks between 1000 and 3000 m, despite the relatively low area represented by these depths. Zonation is thought to result from the colonisation of the deep sea by shallow-water organisms following multiple mass extinction events throughout the Phanerozoic. The effects of low temperature and high pressure act across hierarchical levels of biological organisation and appear sufficient to limit the distributions of such shallow-water species. Hydrostatic pressures of bathyal depths have consistently been identified experimentally as the maximum tolerated by shallow-water and upper bathyal benthic invertebrates at in situ temperatures, and adaptation appears required for passage to deeper water in both benthic invertebrates and demersal fishes. Together, this suggests that a hyperbaric and thermal physiological bottleneck at bathyal depths contributes to bathymetric zonation. The peak of the unimodal diversity-depth pattern typically occurs at these depths even though the area represented by these depths is relatively low. Although it is recognised that, over long evolutionary time scales, shallow-water diversity patterns are driven by speciation, little consideration has been given to the potential implications for species distribution patterns with depth. Molecular and morphological evidence indicates that cool bathyal waters are the primary site of adaptive radiation in the deep sea, and we hypothesise that bathymetric variation in speciation rates could drive the unimodal diversity-depth pattern over time. Thermal effects on metabolic-rate-dependent mutation and on generation times have been proposed to drive differences in speciation rates, which result in modern latitudinal biodiversity patterns over time. Clearly, this thermal mechanism alone cannot explain bathymetric patterns since temperature generally decreases with depth. We hypothesise that demonstrated physiological effects of high hydrostatic pressure and low temperature at bathyal depths, acting on shallow-water taxa invading the deep sea, may invoke a stress-evolution mechanism by increasing mutagenic activity in germ cells, by inactivating canalisation during embryonic or larval development, by releasing hidden variation or mutagenic activity, or by activating or releasing transposable elements in larvae or adults. In this scenario, increased variation at a physiological bottleneck at bathyal depths results in elevated speciation rate. Adaptation that increases tolerance to high hydrostatic pressure and low temperature allows colonisation of abyssal depths and reduces the stress-evolution response, consequently returning speciation of deeper taxa to the background rate. Over time this mechanism could contribute to the unimodal diversity-depth pattern.
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Affiliation(s)
- Alastair Brown
- Ocean and Earth Science, University of Southampton, National Oceanography Centre SouthamptonEuropean Way, Southampton, SO14 3ZH, U.K.
| | - Sven Thatje
- Ocean and Earth Science, University of Southampton, National Oceanography Centre SouthamptonEuropean Way, Southampton, SO14 3ZH, U.K.
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Damerau M, Matschiner M, Salzburger W, Hanel R. Population divergences despite long pelagic larval stages: lessons from crocodile icefishes (Channichthyidae). Mol Ecol 2013; 23:284-99. [DOI: 10.1111/mec.12612] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2013] [Revised: 11/25/2013] [Accepted: 11/27/2013] [Indexed: 11/28/2022]
Affiliation(s)
- M. Damerau
- Thünen-Institute of Fisheries Ecology; Palmaille 9 22767 Hamburg Germany
| | - M. Matschiner
- Department of Mathematics and Statistics; Allan Wilson Centre of Molecular Ecology and Evolution; University of Canterbury; Private Bag 4800 Christchurch New Zealand
- Zoological Institute; University of Basel; Vesalgasse 1 4051 Basel Switzerland
| | - W. Salzburger
- Zoological Institute; University of Basel; Vesalgasse 1 4051 Basel Switzerland
| | - R. Hanel
- Thünen-Institute of Fisheries Ecology; Palmaille 9 22767 Hamburg Germany
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McCracken KG, Wilson RE, Martin AR. Gene flow and hybridization between numerically imbalanced populations of two duck species on the subantarctic island of South Georgia. PLoS One 2013; 8:e82664. [PMID: 24367536 PMCID: PMC3867383 DOI: 10.1371/journal.pone.0082664] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2013] [Accepted: 10/26/2013] [Indexed: 11/30/2022] Open
Abstract
Hybridization is common between species of animals, particularly in waterfowl (Anatidae). One factor shown to promote hybridization is restricted mate choice, which can occur when 2 species occur in sympatry but one is rare. According to the Hubbs principle, or "desperation hypothesis," the rarer species is more likely to mate with heterospecifics. We report the second of 2 independent examples of hybridization between 2 species of ducks inhabiting island ecosystems in the Subantarctic and South Atlantic Ocean. Yellow-billed pintails (Anas georgica) and speckled teal (Anas flavirostris) are abundant in continental South America, where they are sympatric and coexist in mixed flocks. But on South Georgia, an isolated island in the Subantarctic, the pintail population of approximately 6000 pairs outnumbers a small breeding population of speckled teal 300∶1. Using 6 genetic loci (mtDNA and 5 nuclear introns) and Bayesian assignment tests coupled with coalescent analyses, we identified hybrid-origin speckled teal alleles in 2 pintails on South Georgia. While it is unclear whether introgression has also occurred into the speckled teal population, our data suggest that this hybridization was not a recent event, but occurred some time ago. We also failed to identify unequivocal evidence of introgression in a much larger sample of pintails and speckled teal from Argentina using a 3-population "Isolation-with-Migration" coalescent analysis. Combined with parallel findings of hybridization between these same 2 duck species in the Falkland Islands, where population ratios are reversed and pintails are outnumbered by speckled teal 1:10, our results provide further support for the desperation hypothesis, which predicts that scarcity in one population and abundance of another will often lead to hybridization. While the South Georgia pintail population appears to be thriving, it's possible that low density of conspecific mates and inverse density dependence (Allee effect) may be one factor limiting the reproductive output of the speckled teal population, and this situation may persist unless speckled teal increase in abundance on South Georgia.
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Affiliation(s)
- Kevin G. McCracken
- Institute of Arctic Biology, University of Alaska Museum, and Department of Biology and Wildlife, University of Alaska Fairbanks, Fairbanks, Alaska, United States of America
- * E-mail:
| | - Robert E. Wilson
- Institute of Arctic Biology, University of Alaska Museum, and Department of Biology and Wildlife, University of Alaska Fairbanks, Fairbanks, Alaska, United States of America
| | - Anthony R. Martin
- Centre for Remote Environments, University of Dundee, Dundee, United Kingdom
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Martín-Ledo R, López-González PJ. Brittle stars from Southern Ocean (Echinodermata: Ophiuroidea). Polar Biol 2013. [DOI: 10.1007/s00300-013-1411-8] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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González-Wevar CA, Saucède T, Morley SA, Chown SL, Poulin E. Extinction and recolonization of maritime Antarctica in the limpetNacella concinna(Strebel, 1908) during the last glacial cycle: toward a model of Quaternary biogeography in shallow Antarctic invertebrates. Mol Ecol 2013; 22:5221-36. [DOI: 10.1111/mec.12465] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2013] [Accepted: 06/14/2013] [Indexed: 11/26/2022]
Affiliation(s)
- C. A. González-Wevar
- Departamento de Ciencias Ecológicas; Instituto de Ecología y Biodiversidad; Facultad de Ciencias; Universidad de Chile; Las Palmeras # 3425, Ñuñoa Santiago Chile
| | - T. Saucède
- Biogéosciences, UMR CNRS 6282; Université de Bourgogne; Dijon 21000 France
| | - S. A. Morley
- British Antarctic Survey; Madingley Road High Cross Cambridge CB3 0ET UK
| | - S. L. Chown
- Head of School Professor of Biological Science; Monash University; Victoria 3800 Australia
| | - E. Poulin
- Departamento de Ciencias Ecológicas; Instituto de Ecología y Biodiversidad; Facultad de Ciencias; Universidad de Chile; Las Palmeras # 3425, Ñuñoa Santiago Chile
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Roterman CN, Copley JT, Linse KT, Tyler PA, Rogers AD. The biogeography of the yeti crabs (Kiwaidae) with notes on the phylogeny of the Chirostyloidea (Decapoda: Anomura). Proc Biol Sci 2013; 280:20130718. [PMID: 23782878 PMCID: PMC3712414 DOI: 10.1098/rspb.2013.0718] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
The phylogeny of the superfamily Chirostyloidea (Decapoda: Anomura) has been poorly understood owing to limited taxon sampling and discordance between different genes. We present a nine-gene dataset across 15 chirostyloids, including all known yeti crabs (Kiwaidae), to improve the resolution of phylogenetic affinities within and between the different families, and to date key divergences using fossil calibrations. This study supports the monophyly of Chirostyloidea and, within this, a basal split between Eumunididae and a Kiwaidae–Chirostylidae clade. All three families originated in the Mid-Cretaceous, but extant kiwaids and most chirostylids radiated from the Eocene onwards. Within Kiwaidae, the basal split between the seep-endemic Kiwa puravida and a vent clade comprising Kiwa hirsuta and Kiwa spp. found on the East Scotia and Southwest Indian ridges is compatible with a hypothesized seep-to-vent evolutionary trajectory. A divergence date estimate of 13.4–25.9 Ma between the Pacific and non-Pacific lineages is consistent with Kiwaidae spreading into the Atlantic sector of the Southern Ocean via the newly opened Drake Passage. The recent radiation of Kiwaidae adds to the list of chemosynthetic fauna that appear to have diversified after the Palaeocene/Eocene Thermal Maximum, a period of possibly widespread anoxia/dysoxia in deep-sea basins.
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Affiliation(s)
- C N Roterman
- Department of Zoology, University of Oxford, South Parks Road, Oxford OX1 3PS, UK.
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Genetic variability and differentiation among polymorphic populations of the genus Synoicum (Tunicata, Ascidiacea) from the South Shetland Islands. Polar Biol 2013. [DOI: 10.1007/s00300-013-1312-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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