1
|
Sánchez-Zamora C, Nandini S, Sarma SSS. Synergistic effects of microplastics and cyanotoxins on the demography of the rotifer Brachionus calyciflorus Pallas. CHEMOSPHERE 2024; 365:143355. [PMID: 39299462 DOI: 10.1016/j.chemosphere.2024.143355] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2024] [Revised: 09/07/2024] [Accepted: 09/15/2024] [Indexed: 09/22/2024]
Abstract
Plastic contamination in aquatic ecosystems all around the world is on the rise. Microplastics (MPs) interfere with the ecological functions of different aquatic animals, including zooplankton. Other contaminants can also be transported by microplastics, resulting in higher toxicity. Here, we evaluated the effect of microplastics alone and in combination with cyanotoxins (CT) on the demographic and feeding responses of the freshwater rotifer Brachionus calyciflorus. The microplastics used were polystyrene spheres of 30 μm diameter. The cyanobacteria were obtained from a sample collected from the Valle de Bravo reservoir in Central Mexico, and the secondary metabolites were obtained after 5 cycles of freezing, thawing and sonication. We conducted acute (LC50, 24h bioassay) and chronic toxicity tests involving population growth, life table experiments, and feeding experiments. The LC50 value using microplastics was 21.91 mg/L, and for the cyanobacterial crude extract it was 2.56 μg/L, but the combination of both resulted in a higher adverse effect (16.64 mg/L) due to the microplastics. Rotifer survival, reproduction, and feeding decreased in the presence of either MPs or CT but the adverse effect was more in the presence of both contaminants. We found that the adverse effects of MPs and CT on the test rotifer species were enhanced when exposed to both contaminants simultaneously.
Collapse
Affiliation(s)
- Carlos Sánchez-Zamora
- Posgrado en Ciencias Del Mar y Limnología, Universidad Nacional Autónoma de México, Ciudad Universitaria Coyoacán, Av. Universidad 3000, C.P. 04510, Ciudad de México, Mexico
| | - S Nandini
- Universidad Nacional Autónoma de México, Facultad de Estudios Superiores Iztacala, Lab. 6 Zoología Acuática, Av. de Los Barrios No.1, Código Postal 54090, Los Reyes, Tlalnepantla, Estado de México, Mexico.
| | - S S S Sarma
- Universidad Nacional Autónoma de México, Facultad de Estudios Superiores Iztacala, Lab. 6 Zoología Acuática, Av. de Los Barrios No.1, Código Postal 54090, Los Reyes, Tlalnepantla, Estado de México, Mexico
| |
Collapse
|
2
|
Zamora-Barrios CA, Nandini S, Sarma SSS. Effect of microplastics on the demography of Brachionus calyciflorus Pallas (Rotifera) over successive generations. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2024; 275:107061. [PMID: 39217789 DOI: 10.1016/j.aquatox.2024.107061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/07/2024] [Revised: 08/19/2024] [Accepted: 08/21/2024] [Indexed: 09/04/2024]
Abstract
Microplastics (MPs) are becoming increasingly common in freshwater ecosystems. Rotifers may involuntarily ingest MPs through non-selective filtration, thus causing non-real satiety, leading to adverse effects on their demography. Here, we evaluated the acute and chronic effects of MPs (30 µm) on two successive generations of Brachionus calyciflorus s.s. at 20 and 25 °C. Demographic variables and ingestion rates were compared in the absence and presence of microplastics (550 spheres mL-1). For the life table experiments, cohorts of twenty neonates were introduced into 20 mL medium with four replicates per treatment. Ingestion rates of the rotifer were tested at both test temperatures in the absence and presence of the microplastics in 20 mL containers with 1 ind. mL-1 per container. The rotifer population growth rates ranged from 0.55 to 1.05 d-1 depending on the treatment. MPs decreased the fecundity by 20-24 %. The average lifespan of rotifers exposed to MPs in the F0 generation was lower than that in the F1 generation at both temperatures, indicating that pre-exposure of mothers may offer some protection to the offspring. The population growth rate was higher at 25 °C. The ingestion rates were significantly lower in the presence of the microplastics. Our observations indicated that this strain of B. calyciflorus was better adapted to 20 °C; microplastics and higher test temperature resulted in a pronounced changes in the demographic variables of the rotifer.
Collapse
Affiliation(s)
- Cesar Alejandro Zamora-Barrios
- Laboratory of Aquatic Zoology, Division of Research and Postgraduate Studies, Universidad Nacional Autónoma de México, FES-Iztacala, Tlalnepantla, State of Mexico, Postal Code 54090, Mexico
| | - S Nandini
- Laboratory of Aquatic Zoology, Division of Research and Postgraduate Studies, Universidad Nacional Autónoma de México, FES-Iztacala, Tlalnepantla, State of Mexico, Postal Code 54090, Mexico.
| | - S S S Sarma
- Laboratory of Aquatic Zoology, Division of Research and Postgraduate Studies, Universidad Nacional Autónoma de México, FES-Iztacala, Tlalnepantla, State of Mexico, Postal Code 54090, Mexico
| |
Collapse
|
3
|
Xu Y, Ge LL, Cheng XF, Xiang XL, Wen XL, Wang YJ, Fu H, Ge YL, Xi YL. Temporal Distribution Patterns of Cryptic Brachionus calyciflorus (Rotifera) Species in Relation to Biogeographical Gradient Associated with Latitude. Animals (Basel) 2024; 14:244. [PMID: 38254413 PMCID: PMC10812649 DOI: 10.3390/ani14020244] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2023] [Revised: 12/30/2023] [Accepted: 01/10/2024] [Indexed: 01/24/2024] Open
Abstract
Sympatric distribution and temporal overlap of cryptic zooplankton species pose a challenge to the framework of the niche differentiation theory and the mechanisms allowing competitor coexistence. We applied the methods of phylogenetic analysis, DNA taxonomy, and statistical analysis to study the temporal distribution patterns of the cryptic B. calyciflorus species, an excellent model, in three lakes, and to explore the putative mechanisms for their seasonal succession and temporal overlap. The results showed that in the warm-temperate Lake Yunlong, B. fernandoi and B. calyciflorus s.s. underwent a seasonal succession, which was largely attributed to their differential adaptation to water temperature. In the subtropical Lake Jinghu, B. fernandoi, B. calyciflorus s.s., and B. dorcas exhibited both seasonal succession and temporal overlap. Seasonal successions were largely attributed to their differential adaptation to temperature, and temporal overlap resulted from their differential responses to algal food concentration. In the tropical Lake Jinniu, B. calyciflorus s.s. persisted throughout the year and overlapped with B. dorcas for 5 months. The temporal overlap resulted from their differential responses to copepod predation. These results indicated that the temporal distribution pattern of the cryptic B. calyciforus species and the mechanism that allows competitor coexistence vary with different climate zones.
Collapse
Affiliation(s)
- Yuan Xu
- School of Ecology and Environment, Anhui Normal University, Wuhu 241002, China; (Y.X.); (L.-L.G.); (X.-F.C.); (X.-L.X.); (X.-L.W.)
- Collaborative Innovation Center of Recovery and Reconstruction of Degraded Ecosystem in Wanjiang Basin Co-Funded by Anhui Province and Ministry of Education of the People’s Republic of China, Anhui Normal University, Wuhu 241002, China
| | - Le-Le Ge
- School of Ecology and Environment, Anhui Normal University, Wuhu 241002, China; (Y.X.); (L.-L.G.); (X.-F.C.); (X.-L.X.); (X.-L.W.)
- Collaborative Innovation Center of Recovery and Reconstruction of Degraded Ecosystem in Wanjiang Basin Co-Funded by Anhui Province and Ministry of Education of the People’s Republic of China, Anhui Normal University, Wuhu 241002, China
| | - Xin-Feng Cheng
- School of Ecology and Environment, Anhui Normal University, Wuhu 241002, China; (Y.X.); (L.-L.G.); (X.-F.C.); (X.-L.X.); (X.-L.W.)
- Collaborative Innovation Center of Recovery and Reconstruction of Degraded Ecosystem in Wanjiang Basin Co-Funded by Anhui Province and Ministry of Education of the People’s Republic of China, Anhui Normal University, Wuhu 241002, China
| | - Xian-Ling Xiang
- School of Ecology and Environment, Anhui Normal University, Wuhu 241002, China; (Y.X.); (L.-L.G.); (X.-F.C.); (X.-L.X.); (X.-L.W.)
- Collaborative Innovation Center of Recovery and Reconstruction of Degraded Ecosystem in Wanjiang Basin Co-Funded by Anhui Province and Ministry of Education of the People’s Republic of China, Anhui Normal University, Wuhu 241002, China
| | - Xin-Li Wen
- School of Ecology and Environment, Anhui Normal University, Wuhu 241002, China; (Y.X.); (L.-L.G.); (X.-F.C.); (X.-L.X.); (X.-L.W.)
- Collaborative Innovation Center of Recovery and Reconstruction of Degraded Ecosystem in Wanjiang Basin Co-Funded by Anhui Province and Ministry of Education of the People’s Republic of China, Anhui Normal University, Wuhu 241002, China
| | - Yong-Jin Wang
- Management Committee of Scenic Attraction of Lake Yunlong, Xuzhou 221007, China;
| | - Hao Fu
- Reservoir Management Office of Lake Yunlong, Xuzhou 221007, China;
| | - Ya-Li Ge
- School of Ecology and Environment, Anhui Normal University, Wuhu 241002, China; (Y.X.); (L.-L.G.); (X.-F.C.); (X.-L.X.); (X.-L.W.)
- Collaborative Innovation Center of Recovery and Reconstruction of Degraded Ecosystem in Wanjiang Basin Co-Funded by Anhui Province and Ministry of Education of the People’s Republic of China, Anhui Normal University, Wuhu 241002, China
| | - Yi-Long Xi
- School of Ecology and Environment, Anhui Normal University, Wuhu 241002, China; (Y.X.); (L.-L.G.); (X.-F.C.); (X.-L.X.); (X.-L.W.)
- Collaborative Innovation Center of Recovery and Reconstruction of Degraded Ecosystem in Wanjiang Basin Co-Funded by Anhui Province and Ministry of Education of the People’s Republic of China, Anhui Normal University, Wuhu 241002, China
| |
Collapse
|
4
|
Davies N, Lafleur A, Hochberg R, Walsh EJ, Wallace RL. Key to sessile gnesiotrochan rotifers: Families, monospecific species in Flosculariidae, species of Atrochidae, Conochilidae, and Limnias. Zootaxa 2024; 5397:497-520. [PMID: 38221188 DOI: 10.11646/zootaxa.5397.4.3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2024] [Indexed: 01/16/2024]
Abstract
Accurate identification of species is key to understanding their ecological roles and evolutionary history. It is also essential in cataloging biodiversity for comparisons among habitat types, responses to climate change, effective management practices, and more. The paucity of taxonomic expertise is increasing and with it the ability to competently identify species, this is particularly true for small taxa including rotifers. In an effort to improve this situation, we collated information on morphological characters from the literature on all valid species of sessile Gnesiotrocha (phylum Rotifera) currently assigned to two orders and four families. We review Order Collothecaceae, which comprises families Atrochidae (3 spp.) and Collothecidae (50 spp.) and Order Flosculariaceae, which includes families Conochilidae (7 spp.) and Flosculariidae (71 species). Based on that information, we provide dichotomous keys to the Families, monospecific species in Flosculariidae, and species of Atrochidae, Conochilidae, and Limnias. These keys will aid researchers to identify species in these families and lead to a better understanding of freshwater biodiversity and eco-evolutionary processes.
Collapse
Affiliation(s)
- Natalie Davies
- Department of Biology; Ripon College; Ripon; WI; 54971; USA.
| | | | - Rick Hochberg
- University of Massachusetts Lowell; Lowell; MA; 01854; USA.
| | - Elizabeth J Walsh
- Department of Biological Sciences; University of Texas at El Paso; El Paso; TX; 79968; USA.
| | | |
Collapse
|
5
|
Schüßler D, Blanco MB, Guthrie NK, Sgarlata GM, Dammhahn M, Ernest R, Evasoa MR, Hasiniaina A, Hending D, Jan F, le Pors B, Miller A, Olivieri G, Rakotonanahary AN, Rakotondranary SJ, Rakotondravony R, Ralantoharijaona T, Ramananjato V, Randrianambinina B, Raoelinjanakolona NN, Rasoazanabary E, Rasoloarison RM, Rasolofoson DW, Rasoloharijaona S, Rasolondraibe E, Roberts SH, Teixeira H, van Elst T, Johnson SE, Ganzhorn JU, Chikhi L, Kappeler PM, Louis EE, Salmona J, Radespiel U. Morphological variability or inter-observer bias? A methodological toolkit to improve data quality of multi-researcher datasets for the analysis of morphological variation. AMERICAN JOURNAL OF BIOLOGICAL ANTHROPOLOGY 2024; 183:60-78. [PMID: 37607125 DOI: 10.1002/ajpa.24836] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/16/2023] [Revised: 07/21/2023] [Accepted: 08/01/2023] [Indexed: 08/24/2023]
Abstract
OBJECTIVES The investigation of morphological variation in animals is widely used in taxonomy, ecology, and evolution. Using large datasets for meta-analyses has dramatically increased, raising concerns about dataset compatibilities and biases introduced by contributions of multiple researchers. MATERIALS AND METHODS We compiled morphological data on 13 variables for 3073 individual mouse lemurs (Cheirogaleidae, Microcebus spp.) from 25 taxa and 153 different sampling locations, measured by 48 different researchers. We introduced and applied a filtering pipeline and quantified improvements in data quality (Shapiro-Francia statistic, skewness, and excess kurtosis). The filtered dataset was then used to test for genus-wide sexual size dimorphism and the applicability of Rensch's, Allen's, and Bergmann's rules. RESULTS Our pipeline reduced inter-observer bias (i.e., increased normality of data distributions). Inter-observer reliability of measurements was notably variable, highlighting the need to reduce data collection biases. Although subtle, we found a consistent pattern of sexual size dimorphism across Microcebus, with females being the larger (but not heavier) sex. Sexual size dimorphism was isometric, providing no support for Rensch's rule. Variations in tail length but not in ear size were consistent with the predictions of Allen's rule. Body mass and length followed a pattern contrary to predictions of Bergmann's rule. DISCUSSION We highlighted the usefulness of large multi-researcher datasets for testing ecological hypotheses after correcting for inter-observer biases. Using genus-wide tests, we outlined generalizable patterns of morphological variability across all mouse lemurs. This new methodological toolkit aims to facilitate future large-scale morphological comparisons for a wide range of taxa and applications.
Collapse
Affiliation(s)
- Dominik Schüßler
- Institute of Biology and Chemistry, University of Hildesheim, Hildesheim, Germany
| | | | - Nicola K Guthrie
- Department of Anthropology and Archaeology, University of Calgary, Calgary, Alberta, Canada
| | | | | | | | - Mamy Rina Evasoa
- Institute of Zoology, University of Veterinary Medicine Hannover, Hannover, Germany
| | - Alida Hasiniaina
- Institute of Zoology, University of Veterinary Medicine Hannover, Hannover, Germany
- School for International Training, Antananarivo, Madagascar
| | | | - Fabien Jan
- Instituto Gulbenkian de Ciência, Oeiras, Portugal
| | | | - Alex Miller
- Perth Zoo, South Perth, Western Australia, Australia
| | - Gillian Olivieri
- Institute of Zoology, University of Veterinary Medicine Hannover, Hannover, Germany
| | | | | | - Romule Rakotondravony
- Faculté des Sciences, de Technologies et de l'Environnement, Ecole Doctorale Ecosystèmes Naturels, Université de Mahajanga, Mahajanga, Madagascar
| | - Tantely Ralantoharijaona
- Faculté des Sciences, de Technologies et de l'Environnement, Ecole Doctorale Ecosystèmes Naturels, Université de Mahajanga, Mahajanga, Madagascar
| | - Veronarindra Ramananjato
- Department of Integrative Biology, University of California Berkeley, Berkeley, California, USA
- Mention Zoologie et Biodiversité Animale, Faculté des Sciences, Université d'Antananarivo, Antananarivo, Madagascar
| | - Blanchard Randrianambinina
- Faculté des Sciences, de Technologies et de l'Environnement, Ecole Doctorale Ecosystèmes Naturels, Université de Mahajanga, Mahajanga, Madagascar
| | - Nancia N Raoelinjanakolona
- Mention Zoologie et Biodiversité Animale, Faculté des Sciences, Université d'Antananarivo, Antananarivo, Madagascar
| | | | - Rodin M Rasoloarison
- Behavioral Ecology and Sociobiology Unit, German Primate Center, Leibniz Institute for Primate Research, Göttingen, Germany
| | - David W Rasolofoson
- Groupe d'Etude et de Recherche sur les Primates de Madagascar (GERP), Antananarivo, Madagascar
| | - Solofonirina Rasoloharijaona
- Faculté des Sciences, de Technologies et de l'Environnement, Ecole Doctorale Ecosystèmes Naturels, Université de Mahajanga, Mahajanga, Madagascar
| | - Emmanuel Rasolondraibe
- Faculté des Sciences, de Technologies et de l'Environnement, Ecole Doctorale Ecosystèmes Naturels, Université de Mahajanga, Mahajanga, Madagascar
| | | | - Helena Teixeira
- Institute of Zoology, University of Veterinary Medicine Hannover, Hannover, Germany
- UMR ENTROPIE, Université de La Réunion, La Réunion, France
| | - Tobias van Elst
- Institute of Zoology, University of Veterinary Medicine Hannover, Hannover, Germany
| | - Steig E Johnson
- Department of Anthropology and Archaeology, University of Calgary, Calgary, Alberta, Canada
| | - Jörg U Ganzhorn
- Animal Ecology and Conservation, University of Hamburg, Hamburg, Germany
| | - Lounès Chikhi
- Instituto Gulbenkian de Ciência, Oeiras, Portugal
- Laboratoire Évolution et Diversité Biologique, UMR5174, IRD, CNRS, Université Toulouse III Paul Sabatier, Toulouse, France
| | - Peter M Kappeler
- Behavioral Ecology and Sociobiology Unit, German Primate Center, Leibniz Institute for Primate Research, Göttingen, Germany
- Department of Anthropology/Sociobiology, University of Göttingen, Göttingen, Germany
| | - Edward E Louis
- Madagascar Biodiversity Partnership (MBP), Antananarivo, Madagascar
| | - Jordi Salmona
- Laboratoire Évolution et Diversité Biologique, UMR5174, IRD, CNRS, Université Toulouse III Paul Sabatier, Toulouse, France
| | - Ute Radespiel
- Institute of Zoology, University of Veterinary Medicine Hannover, Hannover, Germany
| |
Collapse
|
6
|
Jourdan J, Bundschuh M, Copilaș-Ciocianu D, Fišer C, Grabowski M, Hupało K, Jemec Kokalj A, Kabus J, Römbke J, Soose LJ, Oehlmann J. Cryptic Species in Ecotoxicology. ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY 2023; 42:1889-1914. [PMID: 37314101 DOI: 10.1002/etc.5696] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/19/2023] [Revised: 03/20/2023] [Accepted: 06/12/2023] [Indexed: 06/15/2023]
Abstract
The advent of genetic methods has led to the discovery of an increasing number of species that previously could not be distinguished from each other on the basis of morphological characteristics. Even though there has been an exponential growth of publications on cryptic species, such species are rarely considered in ecotoxicology. Thus, the particular question of ecological differentiation and the sensitivity of closely related cryptic species is rarely addressed. Tackling this question, however, is of key importance for evolutionary ecology, conservation biology, and, in particular, regulatory ecotoxicology. At the same time, the use of species with (known or unknown) cryptic diversity might be a reason for the lack of reproducibility of ecotoxicological experiments and implies a false extrapolation of the findings. Our critical review includes a database and literature search through which we investigated how many of the species most frequently used in ecotoxicological assessments show evidence of cryptic diversity. We found a high proportion of reports indicating overlooked species diversity, especially in invertebrates. In terrestrial and aquatic realms, at least 67% and 54% of commonly used species, respectively, were identified as cryptic species complexes. The issue is less prominent in vertebrates, in which we found evidence for cryptic species complexes in 27% of aquatic and 6.7% of terrestrial vertebrates. We further exemplified why different evolutionary histories may significantly determine cryptic species' ecology and sensitivity to pollutants. This in turn may have a major impact on the results of ecotoxicological tests and, consequently, the outcome of environmental risk assessments. Finally, we provide a brief guideline on how to deal practically with cryptic diversity in ecotoxicological studies in general and its implementation in risk assessment procedures in particular. Environ Toxicol Chem 2023;42:1889-1914. © 2023 The Authors. Environmental Toxicology and Chemistry published by Wiley Periodicals LLC on behalf of SETAC.
Collapse
Affiliation(s)
- Jonas Jourdan
- Department of Aquatic Ecotoxicology, Goethe University, Frankfurt am Main, Germany
| | - Mirco Bundschuh
- iES Landau, Institute for Environmental Sciences, University of Kaiserslautern-Landau, Landau, Germany
- Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences, Uppsala, Sweden
| | - Denis Copilaș-Ciocianu
- Laboratory of Evolutionary Ecology of Hydrobionts, Nature Research Centre, Vilnius, Lithuania
| | - Cene Fišer
- Department of Biology, Biotechnical Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - Michał Grabowski
- Invertebrate Zoology and Hydrobiology, University of Lodz, Łódź, Poland
| | - Kamil Hupało
- Department of Aquatic Ecosystem Research, Faculty of Biology, University of Duisburg-Essen, Essen, Germany
| | - Anita Jemec Kokalj
- Department of Biology, Biotechnical Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - Jana Kabus
- Department of Aquatic Ecotoxicology, Goethe University, Frankfurt am Main, Germany
| | - Jörg Römbke
- ECT Oekotoxikologie, Flörsheim am Main, Germany
| | - Laura J Soose
- Department of Aquatic Ecotoxicology, Goethe University, Frankfurt am Main, Germany
| | - Jörg Oehlmann
- Department of Aquatic Ecotoxicology, Goethe University, Frankfurt am Main, Germany
| |
Collapse
|
7
|
Csősz S, Báthori F, Rádai Z, Herczeg G, Fisher BL. Comparing ant morphology measurements from microscope and online AntWeb.org 2D z-stacked images. Ecol Evol 2023; 13:e9897. [PMID: 36950369 PMCID: PMC10025076 DOI: 10.1002/ece3.9897] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2022] [Revised: 02/17/2023] [Accepted: 02/21/2023] [Indexed: 03/22/2023] Open
Abstract
Unprecedented technological advances in digitization and the steadily expanding open-access digital repositories are yielding new opportunities to quickly and efficiently measure morphological traits without transportation and advanced/expensive microscope machinery. A prime example is the AntWeb.org database, which allows researchers from all over the world to study taxonomic, ecological, or evolutionary questions on the same ant specimens with ease. However, the reproducibility and reliability of morphometric data deduced from AntWeb compared to traditional microscope measurements has not yet been tested. Here, we compared 12 morphological traits of 46 Temnothorax ant specimens measured either directly by stereomicroscope on physical specimens or via the widely used open-access software tpsDig utilizing AntWeb digital images. We employed a complex statistical framework to test several aspects of reproducibility and reliability between the methods. We estimated (i) the agreement between the measurement methods and (ii) the trait value dependence of the agreement, then (iii) compared the coefficients of variation produced by the different methods, and finally, (iv) tested for systematic bias between the methods in a mixed modeling-based statistical framework. The stereomicroscope measurements were extremely precise. Our comparisons showed that agreement between the two methods was exceptionally high, without trait value dependence. Furthermore, the coefficients of variation did not differ between the methods. However, we found systematic bias in eight traits: apart from one trait where software measurements overestimated the microscopic measurements, the former underestimated the latter. Our results shed light on the fact that relying solely on the level of agreement between methods can be highly misleading. In our case, even though the software measurements predicted microscope measurements very well, replacing traditional microscope measurements with software measurements, and especially mixing data collected by the different methods, might result in erroneous conclusions. We provide guidance on the best way to utilize virtual specimens (2D z-stacked images) as a source of morphometric data, emphasizing the method's limitations in certain fields and applications.
Collapse
Affiliation(s)
- Sándor Csősz
- ELKH‐ELTE‐MTM Integrative Ecology Research GroupBudapestHungary
| | - Ferenc Báthori
- Department of Systematic Zoology and EcologyInstitute of Biology, ELTE‐Eötvös Loránd UniversityBudapestHungary
| | - Zoltán Rádai
- Lendület Seed Ecology Research GroupInstitute of Ecology and Botany, Centre for Ecological ResearchVácrátótHungary
| | - Gábor Herczeg
- ELKH‐ELTE‐MTM Integrative Ecology Research GroupBudapestHungary
- Department of Systematic Zoology and EcologyInstitute of Biology, ELTE‐Eötvös Loránd UniversityBudapestHungary
| | - Brian L. Fisher
- EntomologyCalifornia Academy of SciencesSan FranciscoCaliforniaUSA
| |
Collapse
|
8
|
Pelagial Zooplankton Community in a Newly Established Reservoir during and after the Impoundment of a Hydropower Dam. DIVERSITY 2023. [DOI: 10.3390/d15020257] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
Abstract
The global increase in energy demand has triggered a global boom in the construction of hydropower dams worldwide affecting biological communities. Our objective is to study the zooplankton (Rotifera, Cladocera and Copepoda) community structure during and after the impoundment of a newly constructed reservoir, to provide valuable knowledge on species diversity, community structure and dynamics to be considered in future management plans. The impoundment period was characterized by increased species richness with high turnover because of the zooplankton’s high dispersal ability and reflected the inoculation of the reservoir with local fauna. Zooplankton during this period were also correlated negatively with depth and positively with total organic nitrogen and nitrate, highlighting the importance of trophic impact. The time following the impoundment reflected the colonization processes to more stable communities. The seasonality domination followed the Mediterranean pattern, with cold and warm periods being differentiated by changes in community structure, while abundance and biomass remained low throughout the studied period. Combined with the dominance of small-sized individuals, it resulted in low grazing pressure, indicating that zooplankton was not the factor controlling phytoplankton.
Collapse
|
9
|
Rodrigues BL, Galati EAB. Molecular taxonomy of phlebotomine sand flies (Diptera, Psychodidae) with emphasis on DNA barcoding: A review. Acta Trop 2023; 238:106778. [PMID: 36435214 DOI: 10.1016/j.actatropica.2022.106778] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2022] [Revised: 11/21/2022] [Accepted: 11/22/2022] [Indexed: 11/25/2022]
Abstract
The taxonomy and systematics of sand flies (Diptera, Psychodidae, Phlebotominae) are one of the pillars of research aimed to identifying vector populations and the agents transmitted by these insects. Traditionally, the use of morphological traits has been the main line of evidence for the definition of species, but the use of DNA sequences is useful as an integrative approach for their delimitation. Here, we discuss the current status of the molecular taxonomy of sand flies, including their most sequenced molecular markers and the main results. Only about 37% of all sand fly species have been processed for any molecular marker and are publicly available in the NCBI GenBank or BOLD Systems databases. The genera Phlebotomus, Nyssomyia, Psathyromyia and Psychodopygus are well-sampled, accounting for more than 56% of their sequenced species. However, less than 34% of the species of Sergentomyia, Lutzomyia, Trichopygomyia and Trichophoromyia have been sampled, representing a major gap in the knowledge of these groups. The most sequenced molecular markers are those within mtDNA, especially the DNA barcoding fragment of the cytochrome c oxidase subunit I (coi) gene, which has shown promising results in detecting cryptic diversity within species. Few sequences of conserved genes have been generated, which hampers higher-level phylogenetic inferences. We argue that sand fly species should be sequenced for at least the coi DNA barcoding marker, but multiple markers with different mutation rates should be assessed, whenever possible, to generate multilocus analysis.
Collapse
Affiliation(s)
- Bruno Leite Rodrigues
- Programa de Pós-Graduação em Saúde Pública, Faculdade de Saúde Pública da Universidade de São Paulo (FSP/USP). Av. Dr. Arnaldo, 715 - Cerqueira César, São Paulo SP, Brazil, 01246-904.
| | - Eunice Aparecida Bianchi Galati
- Programa de Pós-Graduação em Saúde Pública, Faculdade de Saúde Pública da Universidade de São Paulo (FSP/USP). Av. Dr. Arnaldo, 715 - Cerqueira César, São Paulo SP, Brazil, 01246-904
| |
Collapse
|
10
|
Lemmen KD, Zhou L, Papakostas S, Declerck SAJ. An experimental test of the growth rate hypothesis as a predictive framework for microevolutionary adaptation. Ecology 2023; 104:e3853. [PMID: 36054549 PMCID: PMC10078216 DOI: 10.1002/ecy.3853] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/14/2022] [Revised: 06/30/2022] [Accepted: 07/01/2022] [Indexed: 02/01/2023]
Abstract
The growth rate hypothesis (GRH) posits that the relative body phosphorus content of an organism is positively related to somatic growth rate, as protein synthesis, which is necessary for growth, requires P-rich rRNA. This hypothesis has strong support at the interspecific level. Here, we explore the use of the GRH to predict microevolutionary responses in consumer body stoichiometry. For this, we subjected populations of the rotifer Brachionus calyciflorus to selection for fast population growth rate (PGR) in P-rich (HPF) and P-poor (LPF) food environments. With common garden transplant experiments, we demonstrate that in HP populations evolution toward increased PGR was concomitant with an increase in relative phosphorus content. In contrast, LP populations evolved higher PGR without an increase in relative phosphorus content. We conclude that the GRH has the potential to predict microevolutionary change, but that its application is contingent on the environmental context. Our results highlight the potential of cryptic evolution in determining the performance response of populations to elemental limitation of their food resources.
Collapse
Affiliation(s)
- Kimberley D Lemmen
- Department of Aquatic Ecology, Netherlands Institute of Ecology (NIOO-KNAW), Wageningen, Netherlands
| | - Libin Zhou
- Department of Aquatic Ecology, Netherlands Institute of Ecology (NIOO-KNAW), Wageningen, Netherlands
| | | | - Steven A J Declerck
- Department of Aquatic Ecology, Netherlands Institute of Ecology (NIOO-KNAW), Wageningen, Netherlands.,Department of Biology, Laboratory of Aquatic Ecology, Evolution and Conservation, KU Leuven, Leuven, Belgium
| |
Collapse
|
11
|
Kiemel K, Gurke M, Paraskevopoulou S, Havenstein K, Weithoff G, Tiedemann R. Variation in heat shock protein 40 kDa relates to divergence in thermotolerance among cryptic rotifer species. Sci Rep 2022; 12:22626. [PMID: 36587065 PMCID: PMC9805463 DOI: 10.1038/s41598-022-27137-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2022] [Accepted: 12/26/2022] [Indexed: 01/01/2023] Open
Abstract
Genetic divergence and the frequency of hybridization are central for defining species delimitations, especially among cryptic species where morphological differences are merely absent. Rotifers are known for their high cryptic diversity and therefore are ideal model organisms to investigate such patterns. Here, we used the recently resolved Brachionus calyciflorus species complex to investigate whether previously observed between species differences in thermotolerance and gene expression are also reflected in their genomic footprint. We identified a Heat Shock Protein gene (HSP 40 kDa) which exhibits cross species pronounced sequence variation. This gene exhibits species-specific fixed sites, alleles, and sites putatively under positive selection. These sites are located in protein binding regions involved in chaperoning and may therefore reflect adaptive diversification. By comparing three genetic markers (ITS, COI, HSP 40 kDa), we revealed hybridization events between the cryptic species. The low frequency of introgressive haplotypes/alleles suggest a tight, but not fully impermeable boundary between the cryptic species.
Collapse
Affiliation(s)
- K. Kiemel
- grid.11348.3f0000 0001 0942 1117Unit of Evolutionary Biology/Systematic Zoology, Institute for Biochemistry and Biology, University of Potsdam, Karl-Liebknecht Straße 24-25, 14476 Potsdam, Germany
| | - M. Gurke
- grid.422371.10000 0001 2293 9957Museum für Naturkunde – Leibniz Institute for Evolution and Biodiversity Science, Invalidenstraße 43, 10115 Berlin, Germany ,grid.7468.d0000 0001 2248 7639Department of Biology, Humboldt-University, Invalidenstraße 42, 10115 Berlin, Germany
| | - S. Paraskevopoulou
- grid.4514.40000 0001 0930 2361Department of Biology, Lund University, Microbiology Group, Sölvegatan 35, 223 62 Lund, Sweden
| | - K. Havenstein
- grid.11348.3f0000 0001 0942 1117Unit of Evolutionary Biology/Systematic Zoology, Institute for Biochemistry and Biology, University of Potsdam, Karl-Liebknecht Straße 24-25, 14476 Potsdam, Germany
| | - G. Weithoff
- grid.11348.3f0000 0001 0942 1117Unit of Ecology and Ecosystem Modelling, Institute for Biochemistry and Biology, University of Potsdam, Am Neuen Palais 10, 14469 Potsdam, Germany
| | - R. Tiedemann
- grid.11348.3f0000 0001 0942 1117Unit of Evolutionary Biology/Systematic Zoology, Institute for Biochemistry and Biology, University of Potsdam, Karl-Liebknecht Straße 24-25, 14476 Potsdam, Germany
| |
Collapse
|
12
|
González-Casarrubios A, Cepeda D, Pardos F, Neuhaus B, Yamasaki H, Herranz M, Grzelak K, Maiorova A, Adrianov A, Dal Zotto M, Di Domenico M, Landers SC, Sánchez N. Towards a standardisation of morphological measurements in the phylum Kinorhyncha. ZOOL ANZ 2022. [DOI: 10.1016/j.jcz.2022.11.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
|
13
|
Zhang Y, Feng S, Gao F, Wen H, Zhu L, Li M, Xi Y, Xiang X. The Relationship between Brachionus calyciflorus-Associated Bacterial and Bacterioplankton Communities in a Subtropical Freshwater Lake. Animals (Basel) 2022; 12:ani12223201. [PMID: 36428428 PMCID: PMC9686566 DOI: 10.3390/ani12223201] [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: 09/15/2022] [Revised: 11/12/2022] [Accepted: 11/16/2022] [Indexed: 11/22/2022] Open
Abstract
Zooplankton bodies are organic-rich micro-environments that support fast bacterial growth. Therefore, the abundance of zooplankton-associated bacteria is much higher than that of free-living bacteria, which has profound effects on the nutrient cycling of freshwater ecosystems. However, a detailed analysis of associated bacteria is still less known, especially the relationship between those bacteria and bacterioplankton. In this study, we analyzed the relationships between Brachionus calyciflorus-associated bacterial and bacterioplankton communities in freshwater using high-throughput sequencing. The results indicated that there were significant differences between the two bacterial communities, with only 29.47% sharing OTUs. The alpha diversity of the bacterioplankton community was significantly higher than that of B. calyciflorus-associated bacteria. PCoA analysis showed that the bacterioplankton community gathered deeply, while the B. calyciflorus-associated bacterial community was far away from the whole bacterioplankton community, and the distribution was relatively discrete. CCA analysis suggested that many environmental factors (T, DO, pH, TP, PO43-, NH4+, and NO3-) regulated the community composition of B. calyciflorus-associated bacteria, but the explanatory degree of variability was only 37.80%. High-throughput sequencing revealed that Raoultella and Delftia in Proteobacteria were the dominant genus in the B. calyciflorus-associated bacterial community, and closely related to the biodegradation function. Moreover, several abundant bacterial members participating in carbon and nitrogen cycles were found in the associated bacterial community by network analysis. Predictive results from FAPROTAX showed that the predominant biogeochemical cycle functions of the B. calyciflorus-associated bacterial community were plastic degradation, chemoheterotrophy, and aerobic chemoheterotrophy. Overall, our study expands the current understanding of zooplankton-bacteria interaction and promotes the combination of two different research fields.
Collapse
Affiliation(s)
- Yongzhi Zhang
- School of Ecology and Environment, Anhui Normal University, Wuhu 241002, China
| | - Sen Feng
- School of Ecology and Environment, Anhui Normal University, Wuhu 241002, China
| | - Fan Gao
- School of Ecology and Environment, Anhui Normal University, Wuhu 241002, China
| | - Hao Wen
- School of Ecology and Environment, Anhui Normal University, Wuhu 241002, China
| | - Lingyun Zhu
- School of Ecology and Environment, Anhui Normal University, Wuhu 241002, China
| | - Meng Li
- School of Ecology and Environment, Anhui Normal University, Wuhu 241002, China
| | - Yilong Xi
- School of Ecology and Environment, Anhui Normal University, Wuhu 241002, China
- Collaborative Innovation Center of Recovery and Reconstruction of Degraded Ecosystem in Wanjiang Basin Co-Founded by Anhui Province and Ministry of Education, Wuhu 241002, China
| | - Xianling Xiang
- School of Ecology and Environment, Anhui Normal University, Wuhu 241002, China
- Collaborative Innovation Center of Recovery and Reconstruction of Degraded Ecosystem in Wanjiang Basin Co-Founded by Anhui Province and Ministry of Education, Wuhu 241002, China
- Correspondence: author:
| |
Collapse
|
14
|
Kiemel K, De Cahsan B, Paraskevopoulou S, Weithoff G, Tiedemann R. Mitochondrial genomes of the freshwater monogonont rotifer Brachionus fernandoi and of two additional B. calyciflorus sensu stricto lineages from Germany and the USA (Rotifera, Brachionidae). Mitochondrial DNA B Resour 2022; 7:646-648. [PMID: 35478860 PMCID: PMC9037189 DOI: 10.1080/23802359.2022.2060765] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
Affiliation(s)
- K. Kiemel
- Unit of Evolutionary Biology/Systematic Zoology, Institute for Biochemistry and Biology, University of Potsdam, Potsdam, Germany
| | - B. De Cahsan
- GLOBE Institute, University of Copenhagen, Copenhagen, Denmark
| | - S. Paraskevopoulou
- School of Zoology, George S. Wise Faculty of Life Sciences, Tel Aviv University, Tel Aviv, Israel
| | - G. Weithoff
- Unit of Ecology and Ecosystem Modelling, Institute for Biochemistry and Biology, University of Potsdam, Potsdam, Germany
| | - R. Tiedemann
- Unit of Evolutionary Biology/Systematic Zoology, Institute for Biochemistry and Biology, University of Potsdam, Potsdam, Germany
| |
Collapse
|
15
|
Zhu H, Huang ZY, Jiang S, Pan L, Xi YL. Rapid adaptation of Brachionus dorcas (Rotifera) to tetracycline antibiotic stress. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2022; 245:106126. [PMID: 35228124 DOI: 10.1016/j.aquatox.2022.106126] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/12/2021] [Revised: 01/25/2022] [Accepted: 02/20/2022] [Indexed: 06/14/2023]
Abstract
Although natural populations can rapidly adapt to selection pressures, the fitness consequences of selection are controversial. In this study, a selection experiment was conducted with replicate populations of Brachionus dorcas that were exposed to two sublethal concentrations (26.8 and 78.3 mg/L) of oxytetracycline (OTC), followed by two common garden experiments (population growth and life table experiments). During the 102-day (approximately 36 asexual generations) selection experiment, a markedly increased growth rate but a significantly decreased mictic ratio over time in the populations exposed to OTC when compared to the control populations suggested that the former adapted to the selection pressures and that a trade-off exists between asexual and sexual reproduction. The high and stable population growth rates after 90 days of OTC selection illustrate an example of evolutionary rescue. After 102 days of selection, OTC-selected populations showed higher population growth rates than the control populations when exposed to OTC, indicating significantly increased tolerance. OTC-selected populations showed a lower average growth rate, longer average generation time and life expectancy at hatching, and higher average net reproduction rate and proportion of mictic offspring than the control populations in the absence of OTC, which indicate that OTC selection results in two fitness costs and three fitness gains and that the effect of OTC selection on fitness differs with the measured fitness variables. Both the evolutionary potential of populations under the stress of higher concentrations of OTC and the fitness costs and gains of selection in the absence of OTC indicate that past exposures to pollutants cannot be neglected when evaluating the effects of current stressors on natural populations.
Collapse
Affiliation(s)
- Han Zhu
- Collaborative Innovation Center of Recovery and Reconstruction of Degraded Ecosystem in Wanjiang Basin Co-funded by Anhui Province and Ministry of Education of the People's Republic of China, School of Ecology and Environment, Anhui Normal University, Wuhu 241000, Anhui Province, China
| | - Zhi-Yu Huang
- Collaborative Innovation Center of Recovery and Reconstruction of Degraded Ecosystem in Wanjiang Basin Co-funded by Anhui Province and Ministry of Education of the People's Republic of China, School of Ecology and Environment, Anhui Normal University, Wuhu 241000, Anhui Province, China
| | - Shan Jiang
- Collaborative Innovation Center of Recovery and Reconstruction of Degraded Ecosystem in Wanjiang Basin Co-funded by Anhui Province and Ministry of Education of the People's Republic of China, School of Ecology and Environment, Anhui Normal University, Wuhu 241000, Anhui Province, China
| | - Ling Pan
- Collaborative Innovation Center of Recovery and Reconstruction of Degraded Ecosystem in Wanjiang Basin Co-funded by Anhui Province and Ministry of Education of the People's Republic of China, School of Ecology and Environment, Anhui Normal University, Wuhu 241000, Anhui Province, China
| | - Yi-Long Xi
- Collaborative Innovation Center of Recovery and Reconstruction of Degraded Ecosystem in Wanjiang Basin Co-funded by Anhui Province and Ministry of Education of the People's Republic of China, School of Ecology and Environment, Anhui Normal University, Wuhu 241000, Anhui Province, China.
| |
Collapse
|
16
|
Závacká K, Neděla V, Tihlaříková E, Šabacká P, Maxa J, Heger D. ESEM Methodology for the Study of Ice Samples at Environmentally Relevant Subzero Temperatures: "Subzero ESEM". MICROSCOPY AND MICROANALYSIS : THE OFFICIAL JOURNAL OF MICROSCOPY SOCIETY OF AMERICA, MICROBEAM ANALYSIS SOCIETY, MICROSCOPICAL SOCIETY OF CANADA 2022; 28:196-209. [PMID: 34937589 DOI: 10.1017/s1431927621013854] [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] [Indexed: 06/14/2023]
Abstract
Frozen aqueous solutions are an important subject of study in numerous scientific branches including the pharmaceutical and food industry, atmospheric chemistry, biology, and medicine. Here, we present an advanced environmental scanning electron microscope methodology for research of ice samples at environmentally relevant subzero temperatures, thus under conditions in which it is extremely challenging to maintain the thermodynamic equilibrium of the specimen. The methodology opens possibilities to observe intact ice samples at close to natural conditions. Based on the results of ANSYS software simulations of the surface temperature of a frozen sample, and knowledge of the partial pressure of water vapor in the gas mixture near the sample, we monitored static ice samples over several minutes. We also discuss possible artifacts that can arise from unwanted surface ice formation on, or ice sublimation from, the sample, as a consequence of shifting conditions away from thermodynamic equilibrium in the specimen chamber. To demonstrate the applicability of the methodology, we characterized how the true morphology of ice spheres containing salt changed upon aging and the morphology of ice spheres containing bovine serum albumin. After combining static observations with the dynamic process of ice sublimation from the sample, we can attain images with nanometer resolution.
Collapse
Affiliation(s)
- Kamila Závacká
- Environmental Electron Microscopy Group, Institute of Scientific Instruments of the Czech Academy of Sciences, Královopolská 147, 61264Brno, Czech Republic
| | - Vilém Neděla
- Environmental Electron Microscopy Group, Institute of Scientific Instruments of the Czech Academy of Sciences, Královopolská 147, 61264Brno, Czech Republic
| | - Eva Tihlaříková
- Environmental Electron Microscopy Group, Institute of Scientific Instruments of the Czech Academy of Sciences, Královopolská 147, 61264Brno, Czech Republic
| | - Pavla Šabacká
- Environmental Electron Microscopy Group, Institute of Scientific Instruments of the Czech Academy of Sciences, Královopolská 147, 61264Brno, Czech Republic
| | - Jiří Maxa
- Environmental Electron Microscopy Group, Institute of Scientific Instruments of the Czech Academy of Sciences, Královopolská 147, 61264Brno, Czech Republic
| | - Dominik Heger
- Department of Chemistry, Faculty of Science, Masaryk University, Kamenice 5, 62500Brno, Czech Republic
| |
Collapse
|
17
|
Peres PHF, Luduvério DJ, Bernegossi AM, Galindo DJ, Nascimento GB, Oliveira ML, Sandoval EDP, Vozdova M, Kubickova S, Cernohorska H, Duarte JMB. Revalidation of Mazama rufa (Illiger 1815) (Artiodactyla: Cervidae) as a Distinct Species out of the Complex Mazama americana (Erxleben 1777). Front Genet 2022; 12:742870. [PMID: 34970296 PMCID: PMC8712859 DOI: 10.3389/fgene.2021.742870] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2021] [Accepted: 11/09/2021] [Indexed: 11/13/2022] Open
Abstract
The red brocket deer Mazama americana Erxleben, 1777 is considered a polyphyletic complex of cryptic species with wide chromosomal divergence. Evidence indicates that the observed chromosomal divergences result in reproductive isolation. The description of a neotype for M. americana allowed its genetic characterization and represented a comparative basis to resolve the taxonomic uncertainties of the group. Thus, we designated a neotype for the synonym Mazama rufa Illiger, 1815 and tested its recognition as a distinct species from the M. americana complex with the analysis of morphological, cytogenetic and molecular data. We also evaluated its distribution by sampling fecal DNA in the wild. Morphological data from craniometry and body biometry indicated an overlap of quantitative measurements between M. rufa and the entire M. americana complex. The phylogenetic hypothesis obtained through mtDNA confirmed the reciprocal monophyly relationship between M. americana and M. rufa, and both were identified as distinct molecular operational taxonomic units by the General Mixed Yule Coalescent species delimitation analysis. Finally, classic cytogenetic data and fluorescence in situ hybridization with whole chromosome painting probes showed M. rufa with a karyotype of 2n = 52, FN = 56. Comparative analysis indicate that at least fifteen rearrangements separate M. rufa and M. americana (sensu stricto) karyotypes, which confirmed their substantial chromosomal divergence. This divergence should represent an important reproductive barrier and allow its characterization as a distinct and valid species. Genetic analysis of fecal samples demonstrated a wide distribution of M. rufa in the South American continent through the Atlantic Forest, Cerrado and south region of Amazon. Thus, we conclude for the revalidation of M. rufa as a distinct species under the concept of biological isolation, with its karyotype as the main diagnostic character. The present work serves as a basis for the taxonomic review of the M. americana complex, which should be mainly based on cytogenetic characterization and directed towards a better sampling of the Amazon region, the evaluation of available names in the species synonymy and a multi-locus phylogenetic analysis.
Collapse
Affiliation(s)
- Pedro H F Peres
- Deer Research and Conservation Center (NUPECCE), São Paulo State University (UNESP), Jaboticabal, Brazil
| | - Douglas J Luduvério
- Deer Research and Conservation Center (NUPECCE), São Paulo State University (UNESP), Jaboticabal, Brazil
| | - Agda Maria Bernegossi
- Deer Research and Conservation Center (NUPECCE), São Paulo State University (UNESP), Jaboticabal, Brazil
| | - David J Galindo
- Faculty of Veterinary Medicine, National University of San Marcos (UNMSM), Lima, Peru
| | | | - Márcio L Oliveira
- Deer Research and Conservation Center (NUPECCE), São Paulo State University (UNESP), Jaboticabal, Brazil
| | | | | | | | | | | |
Collapse
|
18
|
Alexiou R, Stamou G, Minoudi S, Tourli F, Tsartsianidou V, Triantafyllidis A, Michaloudi E. The genus Diaphanosoma (Diplostraca: Sididae) in Greece: morphological and molecular assessment. Zootaxa 2021; 5082:572-582. [PMID: 35390944 DOI: 10.11646/zootaxa.5082.6.4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Indexed: 01/14/2023]
Abstract
For the genus Diaphanosoma Fischer (Cladocera) the species name D. brachyurum has been widely used for many decades to identify other species belonging to this genus. To clarify the diversity of the genus in Greek lakes in the present study, we morphologically and genetically identified the Diaphanosoma species occurring in eight lakes. Three hundred twenty-nine Diaphanosoma individuals were morphologically examined, while for the genetic analyses the mtDNA COI gene was sequenced in 48 individuals. Combining the morphological and genetic results, we verified the occurrence of D. mongolianum, D. orghidani and D. macedonicum in our study area. We could not confirm prior records of D. brachyurum and D. lacustris while we provide the molecular identity of D. macedonicum. Furthermore, we highlight the need to check whether the European D. mongolianum populations are characterised of mitochondrial discordance and hybridization as the individuals from the Asian type locality of the species. Our results support the importance of combining both approaches to correctly identify taxonomic species, despite the extra effort and cost during the sample analysis.
Collapse
Affiliation(s)
- Rafailia Alexiou
- Department of Zoology, School of Biology, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece. 2Department of Genetics, Development and Molecular Biology, School of Biology, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece. .
| | - Georgia Stamou
- Department of Zoology, School of Biology, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece. .
| | - Styliani Minoudi
- Department of Genetics, Development and Molecular Biology, School of Biology, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece..
| | - Filio Tourli
- Department of Zoology, School of Biology, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece. 2Department of Genetics, Development and Molecular Biology, School of Biology, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece. .
| | - Valentina Tsartsianidou
- Department of Genetics, Development and Molecular Biology, School of Biology, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece. .
| | - Alexandros Triantafyllidis
- Department of Genetics, Development and Molecular Biology, School of Biology, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece. .
| | - Evangelia Michaloudi
- Department of Zoology, School of Biology, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece. .
| |
Collapse
|
19
|
Drago C, Weithoff G. Variable Fitness Response of Two Rotifer Species Exposed to Microplastics Particles: The Role of Food Quantity and Quality. TOXICS 2021; 9:toxics9110305. [PMID: 34822696 PMCID: PMC8619062 DOI: 10.3390/toxics9110305] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/21/2021] [Revised: 11/05/2021] [Accepted: 11/09/2021] [Indexed: 11/20/2022]
Abstract
Plastic pollution is an increasing environmental problem, but a comprehensive understanding of its effect in the environment is still missing. The wide variety of size, shape, and polymer composition of plastics impedes an adequate risk assessment. We investigated the effect of differently sized polystyrene beads (1-, 3-, 6-µm; PS) and polyamide fragments (5–25 µm, PA) and non-plastics items such as silica beads (3-µm, SiO2) on the population growth, reproduction (egg ratio), and survival of two common aquatic micro invertebrates: the rotifer species Brachionus calyciflorus and Brachionus fernandoi. The MPs were combined with food quantity, limiting and saturating food concentration, and with food of different quality. We found variable fitness responses with a significant effect of 3-µm PS on the population growth rate in both rotifer species with respect to food quantity. An interaction between the food quality and the MPs treatments was found in the reproduction of B. calyciflorus. PA and SiO2 beads had no effect on fitness response. This study provides further evidence of the indirect effect of MPs in planktonic rotifers and the importance of testing different environmental conditions that could influence the effect of MPs.
Collapse
Affiliation(s)
- Claudia Drago
- Department for Ecology and Ecosystem Modelling, University of Potsdam, 14469 Potsdam, Germany;
- Correspondence:
| | - Guntram Weithoff
- Department for Ecology and Ecosystem Modelling, University of Potsdam, 14469 Potsdam, Germany;
- Berlin-Brandenburg Institute of Advanced Biodiversity Research (BBIB), 14195 Berlin, Germany
| |
Collapse
|
20
|
Yin X, Zhao Y, Tian S, Li X. Dormant plasticity of rotifer diapausing eggs in response to predator kairomones. Biol Lett 2021; 17:20210422. [PMID: 34784800 PMCID: PMC8595991 DOI: 10.1098/rsbl.2021.0422] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2021] [Accepted: 10/25/2021] [Indexed: 11/12/2022] Open
Abstract
In freshwater ecosystems, hatching strategy of diapausing eggs (DEs) under predation risk has important ecological implication for zooplankters. Although kairomones released by predators can induce phenotypic responses of prey, hatching patterns of DEs in response to kairomones have received contradictory conclusions in zooplankters. Maternal environment may also affect hatching strategy of DEs during predator-prey interactions. We used classical Brachionus calyciflorus-Asplanchna models to determine the timing and proportion of DE hatching in association with parental and embryonic exposure to kairomones. Results obtained from two Brachionus clones supported the hypothesis that DEs could detect Asplanchna kairomones and adjust hatching patterns. DEs showed early and synchronous hatching patterns in the environment with kairomones. Data also supported the prediction that DEs could gain information about predators from maternal environments and adjusted their hatching pattern in response to the presence of kairomones. Compared with DEs from Brachionus mothers not exposed to kairomones, DEs produced by mothers that were experienced with kairomones attained a higher hatching rate when both of them hatched in the environment either with or without kairomones. Our results suggest that DEs of B. calyciflorus possess dormant plasticity to defend against predation from Asplanchna, which may be regulated by maternal environmental effects during sexual life cycles.
Collapse
Affiliation(s)
- Xuwang Yin
- Liaoning Provincial Key Laboratory for Hydrobiology, College of Fisheries and Life Science, Dalian Ocean University, Dalian, People's Republic of China
| | - Yuecen Zhao
- Liaoning Provincial Key Laboratory for Hydrobiology, College of Fisheries and Life Science, Dalian Ocean University, Dalian, People's Republic of China
| | - Shuang Tian
- Liaoning Provincial Key Laboratory for Hydrobiology, College of Fisheries and Life Science, Dalian Ocean University, Dalian, People's Republic of China
| | - Xiaochun Li
- Liaoning Provincial Key Laboratory for Hydrobiology, College of Fisheries and Life Science, Dalian Ocean University, Dalian, People's Republic of China
| |
Collapse
|
21
|
Lemmen KD, Verhoeven KJF, Declerck SAJ. Experimental evidence of rapid heritable adaptation in the absence of initial standing genetic variation. Funct Ecol 2021. [DOI: 10.1111/1365-2435.13943] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Kimberley D. Lemmen
- Department of Aquatic Ecology Netherlands Institute of Ecology (NIOO‐KNAW) Wageningen The Netherlands
- Department of Evolutionary Biology and Environmental Studies University of Zurich Zurich Switzerland
| | - Koen J. F. Verhoeven
- Department of Terrestrial Ecology Netherlands Institute of Ecology (NIOO‐KNAW) Wageningen The Netherlands
| | - Steven A. J. Declerck
- Department of Aquatic Ecology Netherlands Institute of Ecology (NIOO‐KNAW) Wageningen The Netherlands
- Department of Biology Laboratory of Aquatic Ecology, Evolution and Conservation KULeuven Leuven Belgium
| |
Collapse
|
22
|
Schanz FR, Sommer S, Lami A, Fontaneto D, Ozgul A. Life-history responses of a freshwater rotifer to copper pollution. Ecol Evol 2021; 11:10947-10955. [PMID: 34429893 PMCID: PMC8366851 DOI: 10.1002/ece3.7877] [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: 03/31/2021] [Revised: 06/10/2021] [Accepted: 06/17/2021] [Indexed: 11/19/2022] Open
Abstract
In organisms with dormant stages, life-history responses to past pollution can be studied retrospectively. Here, we study such responses in a rotifer (Brachionus calyciflorus) from the once heavily copper-polluted Lake Orta (Italy). We extracted resting eggs from sediments, established clonal lineages from hatchlings, and exposed newborns of these lineages to one of three copper concentrations that each mimicked a specific period in the lake's pollution history. For each rotifer, we daily collected life-table data. We then estimated treatment-specific vital rates and used a stage-structured population model to project population growth rate λ. We also estimated elasticities of λ to vital rates and contributions of vital rates to observed Δλ between copper treatments. As expected, λ decreased with increasing copper concentration. This decrease resulted mostly from a decline in juvenile survival rate (SJ ) and partly from a decline in the survival rate of asexually reproducing females (SA ). Maturation rate, and with one exception fecundity, also declined but did not contribute consistently to Δλ. λ was most elastic to SJ and SA , indicating that survival rates were under stronger selection than maturation rate and fecundity. Together, our results indicate that variation in juvenile survival is a key component in the rotifers' copper response. The consistent decrease in SJ with increasing copper stress and the sensitivity of λ to that decrease also suggest that juvenile survival is a useful indicator of population performance under environmental pollution.
Collapse
Affiliation(s)
- Federica R. Schanz
- Department of Evolutionary Biology and Environmental StudiesUniversity of ZurichZurichSwitzerland
| | - Stefan Sommer
- Department of Evolutionary Biology and Environmental StudiesUniversity of ZurichZurichSwitzerland
| | - Andrea Lami
- Water Research InstituteNational Research Council of ItalyVerbania PallanzaItaly
| | - Diego Fontaneto
- Water Research InstituteNational Research Council of ItalyVerbania PallanzaItaly
| | - Arpat Ozgul
- Department of Evolutionary Biology and Environmental StudiesUniversity of ZurichZurichSwitzerland
| |
Collapse
|
23
|
Gama-Flores JL, Huidobro-Salas ME, Sarma SSS, Nandini S. Population responses and fatty acid profiles of Brachionus calyciflorus (Rotifera) in relation to different thermal regimes. J Therm Biol 2020; 94:102752. [PMID: 33292993 DOI: 10.1016/j.jtherbio.2020.102752] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2020] [Revised: 09/18/2020] [Accepted: 10/05/2020] [Indexed: 10/23/2022]
Abstract
Diurnal temperature fluctuations affect ectothermic species more than endothermic taxa. We tested the effect of three fixed temperatures (20, 25 and 30 °C) and a 24 h variable (20-30 °C) on the population growth and fatty acid profiles of the common rotifer Brachionus calyciflorus. Depending on the temperature treatment, the peak population abundances of B. calyciflorus varied from 65 to 80 ind./ml, the lowest being on variable temperature range. The rate of population increase varied from 0.31 to 0.52 per day, highest being at 30 °C. There was a curvilinear relationship between the population density and the egg ratio (number of eggs/female) in all the tested temperature regimes. The egg ratio was higher (>0.6) for treatments involving fixed temperatures, but for variable temperature regime, the egg ratios were lower (<0.5). Temperature also induced changes in the fatty acid content of B. calyciflorus. While the total saturated fatty acids increased, both mono-unsaturated and poly-unsaturated fatty acids decreased with increasing temperature regime. These results have been interpreted in relation to the role of temperature (both intensity and mode of exposure) on the population growth characteristics of rotifers.
Collapse
Affiliation(s)
- José Luis Gama-Flores
- Carrera de Biología, National Autonomous University of Mexico, Campus Iztacala Av. de Los Barrios No.1, C.P. 54090, Los Reyes, Tlalnepantla, State of Mexico, Mexico
| | - María Elena Huidobro-Salas
- Carrera de Biología, National Autonomous University of Mexico, Campus Iztacala Av. de Los Barrios No.1, C.P. 54090, Los Reyes, Tlalnepantla, State of Mexico, Mexico
| | - S S S Sarma
- Laboratory of Aquatic Zoology, Division of Research and Postgraduate Studies, National Autonomous University of Mexico, Campus Iztacala Av. de Los Barrios No.1, C.P. 54090, Los Reyes, Tlalnepantla, State of Mexico, Mexico.
| | - S Nandini
- Laboratory of Aquatic Zoology, Division of Research and Postgraduate Studies, National Autonomous University of Mexico, Campus Iztacala Av. de Los Barrios No.1, C.P. 54090, Los Reyes, Tlalnepantla, State of Mexico, Mexico
| |
Collapse
|
24
|
Temperature-dependent life history and transcriptomic responses in heat-tolerant versus heat-sensitive Brachionus rotifers. Sci Rep 2020; 10:13281. [PMID: 32764662 PMCID: PMC7411042 DOI: 10.1038/s41598-020-70173-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2020] [Accepted: 07/22/2020] [Indexed: 01/12/2023] Open
Abstract
Thermal stress response is an essential physiological trait that determines occurrence and temporal succession in nature, including response to climate change. We compared temperature-related demography in closely related heat-tolerant and heat-sensitive Brachionus rotifer species. We found significant differences in heat response, with the heat-sensitive species adopting a strategy of long survival and low population growth, while the heat-tolerant followed the opposite strategy. In both species, we examined the genetic basis of physiological variation by comparing gene expression across increasing temperatures. Comparative transcriptomic analyses identified shared and opposing responses to heat. Interestingly, expression of heat shock proteins (hsps) was strikingly different in the two species and mirrored differences in population growth rates, showing that hsp genes are likely a key component of a species' adaptation to different temperatures. Temperature induction caused opposing patterns of expression in further functional categories including energy, carbohydrate and lipid metabolism, and in genes related to ribosomal proteins. In the heat-sensitive species, elevated temperatures caused up-regulation of genes related to meiosis induction and post-translational histone modifications. This work demonstrates the sweeping reorganizations of biological functions that accompany temperature adaptation in these two species and reveals potential molecular mechanisms that might be activated for adaptation to global warming.
Collapse
|
25
|
Schälicke S, Heim S, Martin-Creuzburg D, Wacker A. Inter- and intraspecific differences in rotifer fatty acid composition during acclimation to low-quality food. Philos Trans R Soc Lond B Biol Sci 2020; 375:20190644. [PMID: 32536305 DOI: 10.1098/rstb.2019.0644] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
Biochemical food quality constraints affect the performance of consumers and mediate trait variation among and within consumer species. To assess inter- and intraspecific differences in fatty acid retention and conversion in freshwater rotifers, we provided four strains of two closely related rotifer species, Brachionus calyciflorus sensu stricto and Brachionus fernandoi, with food algae differing in their fatty acid composition. The rotifers grazed for 5 days on either Nannochloropsis limnetica or Monoraphidium minutum, two food algae with distinct polyunsaturated fatty acid (PUFA) profiles, before the diets were switched to PUFA-free Synechococcus elongatus, which was provided for three more days. We found between- and within-species differences in rotifer fatty acid compositions on the respective food sources and, in particular, highly specific acclimation reactions to the PUFA-free diet. The different reactions indicate inter- but also intraspecific differences in physiological traits, such as PUFA retention, allocation and bioconversion capacities, within the genus Brachionus that are most likely accompanied by differences in their nutritional demands. Our data suggest that biochemical food quality constraints act differently on traits of closely related species and of strains of a particular species and thus might be involved in shaping ecological interactions and evolutionary processes. This article is part of the theme issue 'The next horizons for lipids as 'trophic biomarkers': evidence and significance of consumer modification of dietary fatty acids'.
Collapse
Affiliation(s)
- Svenja Schälicke
- Institute of Biochemistry and Biology, University of Potsdam, Am Neuen Palais 10, D-14469 Potsdam, Germany
| | - Silvia Heim
- Institute of Biochemistry and Biology, University of Potsdam, Am Neuen Palais 10, D-14469 Potsdam, Germany
| | | | - Alexander Wacker
- Animal Ecology Group, Zoological Institute and Museum, University of Greifswald, Loitzer Strasse 26, D-17489 Greifswald, Germany
| |
Collapse
|
26
|
Zhou L, Declerck SAJ. Maternal effects in zooplankton consumers are not only mediated by direct but also by indirect effects of phosphorus limitation. OIKOS 2020. [DOI: 10.1111/oik.06898] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Libin Zhou
- Dept of Aquatic Ecology, Netherlands Inst. of Ecology (NIOO‐KNAW) Droevendaalsesteeg 10 NL‐6708 PB Wageningen the Netherlands
| | - Steven A. J. Declerck
- Dept of Aquatic Ecology, Netherlands Inst. of Ecology (NIOO‐KNAW) Droevendaalsesteeg 10 NL‐6708 PB Wageningen the Netherlands
- Laboratory of Aquatic Ecology, Evolution and Conservation, KULeuven Leuven Belgium
| |
Collapse
|
27
|
Neděla V, Tihlaříková E, Maxa J, Imrichová K, Bučko M, Gemeiner P. Simulation-based optimisation of thermodynamic conditions in the ESEM for dynamical in-situ study of spherical polyelectrolyte complex particles in their native state. Ultramicroscopy 2020; 211:112954. [PMID: 32018072 DOI: 10.1016/j.ultramic.2020.112954] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2019] [Revised: 01/23/2020] [Accepted: 01/26/2020] [Indexed: 11/18/2022]
Abstract
We present a complex analysis and optimisation of dynamic conditions in the environmental scanning electron microscope (ESEM) to allow in-situ observation of extremely delicate wet bio-polymeric spherical particles in their native state. According to the results of gas flow and heat transfer simulations, we were able to develop an improved procedure leading to thermodynamic equilibrium between the sample and chamber environment. To quantify and hence minimise the extent of any sample deformation during specimen chamber pumping, a strength-stress analysis is used. Monte Carlo simulations of beam-gas, -water, and -sample interactions describe beam scattering, absorbed energy, interaction volume and the emission of signal electrons in the ESEM. Finally, we discuss sample damage as a result of drying and the production of beam-induced free radicals. Based on all experimental and simulation results we introduce a Delicate Sample Observation Strategy for the ESEM. We show how this strategy can be applied to the characterization of polyelectrolyte complex spherical particles containing immobilized recombinant cells E. coli overexpressing cyclohexanone monooxygenase, used as a model biocatalyst. We present the first native-state electron microscopy images of the viscous core of a halved polyelectrolyte complex capsule containing living cells.
Collapse
Affiliation(s)
- Vilém Neděla
- Environmental electron microscopy group, Institute of Scientific Instruments of ASCR, Královopolská 147, 61264 Brno, Czech Republic.
| | - Eva Tihlaříková
- Environmental electron microscopy group, Institute of Scientific Instruments of ASCR, Královopolská 147, 61264 Brno, Czech Republic
| | - Jiří Maxa
- Environmental electron microscopy group, Institute of Scientific Instruments of ASCR, Královopolská 147, 61264 Brno, Czech Republic
| | - Kamila Imrichová
- Environmental electron microscopy group, Institute of Scientific Instruments of ASCR, Královopolská 147, 61264 Brno, Czech Republic
| | - Marek Bučko
- Institute of Chemistry, Centre for Glycomics, Slovak Academy of Sciences, Dúbravská cesta 9, 84538 Bratislava, Slovakia
| | - Peter Gemeiner
- Institute of Chemistry, Centre for Glycomics, Slovak Academy of Sciences, Dúbravská cesta 9, 84538 Bratislava, Slovakia
| |
Collapse
|
28
|
Schälicke S, Teubner J, Martin-Creuzburg D, Wacker A. Fitness response variation within and among consumer species can be co-mediated by food quantity and biochemical quality. Sci Rep 2019; 9:16126. [PMID: 31695099 PMCID: PMC6834596 DOI: 10.1038/s41598-019-52538-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2019] [Accepted: 10/18/2019] [Indexed: 12/02/2022] Open
Abstract
In natural heterogeneous environments, the fitness of animals is strongly influenced by the availability and composition of food. Food quantity and biochemical quality constraints may affect individual traits of consumers differently, mediating fitness response variation within and among species. Using a multifactorial experimental approach, we assessed population growth rate, fecundity, and survival of six strains of the two closely related freshwater rotifer species Brachionus calyciflorus sensu stricto and Brachionus fernandoi. Therefore, rotifers fed low and high concentrations of three algal species differing in their biochemical food quality. Additionally, we explored the potential of a single limiting biochemical nutrient to mediate variations in population growth response. Therefore, rotifers fed a sterol-free alga, which we supplemented with cholesterol-containing liposomes. Co-limitation by food quantity and biochemical food quality resulted in differences in population growth rates among strains, but not between species, although effects on fecundity and survival differed between species. The effect of cholesterol supplementation on population growth was strain-specific but not species-specific. We show that fitness response variations within and among species can be mediated by biochemical food quality. Dietary constraints thus may act as evolutionary drivers on physiological traits of consumers, which may have strong implications for various ecological interactions.
Collapse
Affiliation(s)
- Svenja Schälicke
- Institute of Biochemistry and Biology, University of Potsdam, Am Neuen Palais 10, D-14469, Potsdam, Germany.
| | - Johannes Teubner
- Institute of Biochemistry and Biology, University of Potsdam, Am Neuen Palais 10, D-14469, Potsdam, Germany
| | | | - Alexander Wacker
- Institute of Biochemistry and Biology, University of Potsdam, Am Neuen Palais 10, D-14469, Potsdam, Germany
- Animal Ecology group, Zoological Institute and Museum, University of Greifswald, Loitzer Str. 26, D-17489, Greifswald, Germany
| |
Collapse
|
29
|
Choi BS, Lee YH, Hagiwara A, Lee JS. Complete mitochondrial genome of the freshwater monogonont rotifer Brachionus calyciflorus (Rotifera, Brachionidae). Mitochondrial DNA B Resour 2019; 4:3593-3595. [PMID: 33366100 PMCID: PMC7707316 DOI: 10.1080/23802359.2019.1676679] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2019] [Accepted: 09/23/2019] [Indexed: 11/30/2022] Open
Abstract
The two complete mitochondrial genomes were sequenced from the Netherlands strain of the freshwater monogonont rotifer Brachionus calyciflorus. The mitochondrial genome sequences were 27,698 bp and 9,906 bp in size, respectively. The gene order and contents of the two B. calyciflorus strains were mostly identical to one another, except for the additional identification and translocation of several tRNAs in mitochondrial DNA I and II. Of 13 protein-coding genes (PCGs), three genes (ND1, ND5, and ND3) had incomplete stop codons. Furthermore, the start codon of ND2, CO2, and CO3 and ND4 genes was ATT, GTG, and ATA, respectively, while the start codon of other PCGs was ATG. The base composition of 13 PCGs of B. calyciflorus (the Netherlands strain) mitogenome showed 31.1% for A, 37.6% for T, 16.5% for C, and 14.8% for G, respectively.
Collapse
Affiliation(s)
| | - Young Hwan Lee
- Department of Biological Science, College of Science, Sungkyunkwan University, Suwon, South Korea
| | - Atsushi Hagiwara
- Institute of Integrated Science and Technology, Nagasaki University, Nagasaki, Japan
- Organization for Marine Science and Technology, Nagasaki University, Nagasaki, Japan
| | - Jae-Seong Lee
- Department of Biological Science, College of Science, Sungkyunkwan University, Suwon, South Korea
| |
Collapse
|
30
|
Guerrero-Jiménez G, Vannucchi PE, Silva-Briano M, Adabache-Ortiz A, Rico-Martínez R, Roberts D, Neilson R, Elías-Gutiérrez M. Brachionus paranguensis sp. nov. (Rotifera, Monogononta), a member of the L group of the Brachionus plicatilis complex. Zookeys 2019; 880:1-23. [PMID: 31649478 PMCID: PMC6803355 DOI: 10.3897/zookeys.880.28992] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2018] [Accepted: 08/19/2019] [Indexed: 12/02/2022] Open
Abstract
The Brachionus plicatilis complex represents the most studied group of rotifers, although the systematics of the species complex has not been completely clarified. Many studies have been conducted trying to explore the diversity within the complex, leading to the recognition of three major morphotypes: large (L), small-medium (SM), and small (SS). Currently six species have been described and classified under these types and another nine taxa have been identified but not formally described. Within the L group, three species have been officially described [B. plicatilis s.s. (L1), B. manjavacas (L2), and B. asplanchnoidis (L3)], while a formal description of L4, unofficially known as B. 'Nevada', is still lacking. In the present study, a new species, Brachionus paranguensis sp. nov., is formally described and presented as a representative of the L4 clade. The species has been named after a high altitude saline crater lake from Central Mexico, where the specimens were collected. An integrated approach using DNA taxonomy through COI and ITS1 markers, morphology, and ecology was used to confirm the identity of the new species.
Collapse
Affiliation(s)
- Gerardo Guerrero-Jiménez
- Instituto del Agua, Universidad de Granada, Ramón y Cajal 4, 18071, Granada, España. Departamento de Ecología, Facultad de ciencias, Universidad de Granada, Fuentenueva s/n, 18071Granada, Spain
| | - Patrizia Elena Vannucchi
- Centro de Investigación en Ciencias del Mar y Limnología (CIMAR), Universidad de Costa Rica, San Pedro, San José, 11501, Costa Rica
| | - Marcelo Silva-Briano
- Universidad Autónoma de Aguascalientes, Centro de Ciencias Básicas, Departamento de Biología. Avenida Universidad 940, C.P. 20131, Aguascalientes, Ags. México
| | - Araceli Adabache-Ortiz
- Universidad Autónoma de Aguascalientes, Centro de Ciencias Básicas, Departamento de Biología. Avenida Universidad 940, C.P. 20131, Aguascalientes, Ags. México
| | - Roberto Rico-Martínez
- Universidad Autónoma de Aguascalientes, Centro de Ciencias Básicas, Departamento de Química. Avenida Universidad 940, C.P. 20131, Aguascalientes, Ags., México
| | - David Roberts
- The James Hutton Institute, Craigiebuckler, Dundee DD2 5DA, Scotland, UK
| | - Roy Neilson
- The James Hutton Institute, Craigiebuckler, Dundee DD2 5DA, Scotland, UK
| | - Manuel Elías-Gutiérrez
- El Colegio de la Frontera Sur, Unidad Chetumal. Av. Centenario Km 5.5, C.P. 77014, Chetumal, Quintana Roo, México
| |
Collapse
|
31
|
Tihlaříková E, Neděla V, Đorđević B. In-situ preparation of plant samples in ESEM for energy dispersive x-ray microanalysis and repetitive observation in SEM and ESEM. Sci Rep 2019; 9:2300. [PMID: 30783188 PMCID: PMC6381206 DOI: 10.1038/s41598-019-38835-w] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2018] [Accepted: 01/07/2019] [Indexed: 11/25/2022] Open
Abstract
The Extended Low Temperature Method (ELTM) for the in-situ preparation of plant samples in an environmental scanning electron microscope enables carrying out repetitive topographical and material analysis at a higher resolution in the vacuum conditions of a scanning electron microscope or in the low gas pressure conditions of an environmental scanning electron microscope. The method does not require any chemical intervention and is thus suitable for imaging delicate structures rarely observable with common treatment methods. The method enables both sample stabilization as close to their native state as possible, as well as the transfer of the same sample from a low vacuum to an atmospheric condition for sample storage or later study. It is impossible for wet samples in the environmental scanning electron microscope. Our studies illustrate the high applicability of the ELTM for different types of plant tissue, from imaging of plant waxes at higher resolution, the morphological study of highly susceptible early somatic embryos to the elemental microanalysis of root cells. The method established here provides a very fast, universal and inexpensive solution for plant sample treatment usable in a commercial environmental scanning electron microscope equipped with a cooling Peltier stage.
Collapse
Affiliation(s)
- Eva Tihlaříková
- Institute of Scientific Instruments of the Czech Academy of Sciences, Brno, 612 00, Czech Republic.
| | - Vilém Neděla
- Institute of Scientific Instruments of the Czech Academy of Sciences, Brno, 612 00, Czech Republic
| | - Biljana Đorđević
- Department of Plant Biology, Mendel University in Brno, Brno, 613 00, Czech Republic
| |
Collapse
|
32
|
Rosenbaum B, Raatz M, Weithoff G, Fussmann GF, Gaedke U. Estimating Parameters From Multiple Time Series of Population Dynamics Using Bayesian Inference. Front Ecol Evol 2019. [DOI: 10.3389/fevo.2018.00234] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
|
33
|
Paraskevopoulou S, Tiedemann R, Weithoff G. Differential response to heat stress among evolutionary lineages of an aquatic invertebrate species complex. Biol Lett 2018; 14:rsbl.2018.0498. [PMID: 30487258 DOI: 10.1098/rsbl.2018.0498] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2018] [Accepted: 10/31/2018] [Indexed: 11/12/2022] Open
Abstract
Under global warming scenarios, rising temperatures can constitute heat stress to which species may respond differentially. Within a described species, knowledge on cryptic diversity is of further relevance, as different lineages/cryptic species may respond differentially to environmental change. The Brachionus calyciflorus species complex (Rotifera), which was recently described using integrative taxonomy, is an essential component of aquatic ecosystems. Here, we tested the hypothesis that these (formerly cryptic) species differ in their heat tolerance. We assigned 47 clones with nuclear ITS1 (nuITS1) and mitochondrial COI (mtCOI) markers to evolutionary lineages, now named B. calyciflorus sensu stricto (s.s.) and B. fernandoi We selected 15 representative clones and assessed their heat tolerance as a bi-dimensional phenotypic trait affected by both the intensity and duration of heat stress. We found two distinct groups, with B. calyciflorus s.s. clones having higher heat tolerance than the novel species B. fernandoi This apparent temperature specialization among former cryptic species underscores the necessity of a sound species delimitation and assignment, when organismal responses to environmental changes are investigated.
Collapse
Affiliation(s)
- Sofia Paraskevopoulou
- Institute of Biochemistry and Biology, Unit of Evolutionary Biology and Systematic Zoology, University of Potsdam, D-14476 Potsdam, Germany .,Institute of Biochemistry and Biology, Unit of Ecology and Ecosystem Modelling, University of Potsdam, D-14469 Potsdam, Germany
| | - Ralph Tiedemann
- Institute of Biochemistry and Biology, Unit of Evolutionary Biology and Systematic Zoology, University of Potsdam, D-14476 Potsdam, Germany
| | - Guntram Weithoff
- Institute of Biochemistry and Biology, Unit of Ecology and Ecosystem Modelling, University of Potsdam, D-14469 Potsdam, Germany.,Berlin-Brandenburg Institute of Advanced Biodiversity Research (BBIB), Altensteinstr. 6, 14195 Berlin, Germany
| |
Collapse
|