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  • 1
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    Genotypes of Bathymodiolus vent mussels from the Mid-Atlantic Ridge using SNP and mitochondrial markers (2016)
    PANGAEA
    In:  Supplement to: Breusing, Corinna; Vrijenhoek, Robert C; Reusch, Thorsten B H (2017): Widespread introgression in deep-sea hydrothermal vent mussels. BMC Evolutionary Biology, 17(1), https://doi.org/10.1186/s12862-016-0862-2
    Details
    Publication Date: 2023-01-13
    Description: The provided file archive contains genotype data from mid-Atlantic hydrothermal vent mussels (genus Bathymodiolus) at 18 SNP loci and the mitochondrial ND4 gene (BMAR_Baz_Bpu_genotypes.txt). The subfolders denote statistical programs used in the multilocus genotyping study and contain input files and scripts that were used in the respective analyses. Our analyses indicate that B. azoricus and B. puteoserpentis hybridize introgressively across a large geographic area without evidence for general hybrid incompatibilities. While these findings shed new light onto the genetic structure of this hybrid zone, many aspects about its nature still remain obscure. Our study sets a baseline for further research that should primarily focus on the acquisition of additional mussel samples and environmental data, a detailed exploration of vent areas and hidden populations as well as genomic analyses in both mussel hosts and their bacterial symbionts.
    Type: Dataset
    Format: application/zip, 29.4 kBytes
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 2
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    (Table S1) Molecular analyses and morphological comparisons of deep-sea clams
    PANGAEA
    In:  Supplement to: Audzijonyte, Asta; Krylova, Elena M; Sahling, Heiko; Vrijenhoek, Robert C (2012): Molecular taxonomy reveals broad trans-oceanic distributions and high species diversity of deep-sea clams (Bivalvia: Vesicomydae: Pliocardiinae) in chemosynthetic environments. Systematics and Biodiversity, 10, 403-415, https://doi.org/10.1080/14772000.2012.744112
    Details
    Publication Date: 2023-05-12
    Description: Large vesicomyid clams are common inhabitants of sulphidic deep-sea habitats such as hydrothermal vents, hydrocarbon seeps and whale-falls. Yet, the species- and genus-level taxonomy of these diverse clams has been unstable due to insufficiencies in sampling and absence of detailed taxonomic studies that would consistently compare molecular and morphological characters. To clarify uncertainties about species-level assignments, we examined DNA sequences from mitochondrial cytochrome-c-oxidase subunit I (COI) in conjunction with morphological characters. New and published COI sequences were used to create a molecular database for 44 unique evolutionary lineages corresponding to species. Overall, the congruence between molecular and morphological characters was good. Several discrepancies due to synonymous species designations were recognized, and acceptable species names were rectified with published COI sequences in cases where morphological specimens were available. We identified seven species with trans-Pacific distributions, and two species with Indo-Pacific distributions. Presently, 27 species have only been documented from one region, which might reflect limited ranges, or insufficient geographical sampling. Vesicomyids exhibit the greatest species diversity along the northwest Pacific ridge systems and in the eastern Pacific, along the western America margin, where depth zonation typically results in segregation of closely related species. The broad distributions of several vesicomyid species suggest that their required chemosynthetic habitats might be more common than previously recognized and occur along most continental margins.
    Keywords: Accession number; Area/locality; Cruise/expedition; ELEVATION; Elevation 2; Group; Habitat; LATITUDE; LONGITUDE; Morphology; Number of mitochondrial cytochrome-c-oxidase subunit I sequences; Sample code/label; Sampling date; Species; Taxon/taxa
    Type: Dataset
    Format: text/tab-separated-values, 2463 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 3
    Electronic Resource
    Electronic Resource
    Electrophoretic identification and genetic analysis of bivalve larvae (1992)
    Springer
    Marine biology 113 (1992), S. 227-230 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Taxonomic identification and genetic analysis of larval marine invertebrates have been vexing problems. We describe a polyacrylamide mini-gel electrophoresis technique for resolving proteins from individual larval bivalves (shell length 250 to 350 μm) and apply this technique to three species of laboratory-cultured larval oysters [Ostrea edulis L., 1758, Crassostrea gigas (Thunberg, 1793) and c. virginica (Gmelin, 1791)] reared during summer 1989. Electrophoretic patterns of proteins clearly discriminate among the three species and allow genetic analysis of a polymorphic allozyme locus (Pgi) in field-collected larvae and juveniles of C. virginica. This technique provides an economical tool for largescale taxonomic, ecologic, and genetic studies of meroplanktonic stages of various species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00347275
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    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Neutral and Nonneutral Mitochondrial Genetic Variation in Deep-Sea Clams from the Family Vesicomyidae (2000)
    Springer
    Journal of molecular evolution 50 (2000), S. 141-153 
    Details
    ISSN: 1432-1432
    Keywords: Key words: Nearly neutral variation — Synonymous — Nonsynonymous — Ribosomal RNA — Neutrality tests — Deep-sea chemoautotrophic bivalves
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract. Nucleotide sequences at two mitochondrial genes from 57 individuals representing eight species of deep-sea clams (Vesicomyidae) were examined for variation consistent with the neutral model of molecular evolution. One gene, cytochrome oxidase subunit I (COI), deviated from the expectations of neutrality by containing an excess of intraspecific nonsynonymous polymorphism. Additionally, one species, Calyptogena kilmeri, showed a significant excess of rare polymorphism specifically at the COI locus. In contrast, a second mitochondrial gene, the large-subunit 16S ribosomal RNA gene (16S), showed little deviation from neutrality either between or within species. Together, COI and 16S show no deviation from neutral expectations by the HKA test, produce congruent phylogenetic relationships between species, and show correlated numbers of fixed differences between species and polymorphism within species. These patterns of both neutral and nonneutral evolution within the mitochondrial genome are most consistent with a model where intraspecific nonsynonymous polymorphism at COI is near neutrality. In addition to examining the forces of molecular evolution, we extend hypotheses about interspecific relationships within this family for geographical locations previously unexamined by molecular methods including habitats near the Middle Atlantic, the Aleutian Trench, and Costa Rica.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002399910016
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    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Red Queen hypothesis supported by parasitism in sexual and clonal fish (1990)
    [s.l.] : Nature Publishing Group
    Nature 344 (1990), S. 864-866 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/344864a0
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    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Genetic variation among laboratory strains of the planorbid snail Biomphalaria glabrata (1981)
    Springer
    Biochemical genetics 19 (1981), S. 1169-1182 
    Details
    ISSN: 1573-4927
    Keywords: Biomphalaria glabrata ; polymorphism ; genetics ; snails
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Isozymes of laboratory strains of Biomphalaria glabrata have been studied by starch gel electrophoresis. Methods are outlined for adaptation of this technique to the genetic study of these snails. Twenty-eight presumptive gene loci have been identified. Twelve invariant enzymes were observed. Sixteen loci displayed some polymorphism within or among the strains. These polymorphisms were generally widespread among strains from Brazil, Puerto Rico, St. Lucia, and the Dominican Republic. A high degree of intrastrain polymorphism was noted even in some presumably inbred laboratory strains. Crosses between strains were used to demonstrate the genetic basis for the patterns observed at 9 of the 16 polymorphic loci.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00484572
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Feeding behavior in sexual and clonal strains of Poeciliopsis (1992)
    Springer
    Behavioral ecology and sociobiology 30 (1992), S. 1-6 
    Details
    ISSN: 1432-0762
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Sexual and clonal fish of the genus Poeciliopsis occur together in desert streams of Sonora, Mexico. Their coexistence has been explained in terms of niche partitioning for food and space. We examined predatory behavior that might influence niche relationships, and found significant differences among two coexisting sperm-dependent clonal strains and their two sexual progenitors. Handling time and prey manipulation of free-swimming (Artemia) and benthic (chironomid larvae) prey differed significantly among sexual and clonal strains. Analyses of gut contents from field-collected fish revealed that the laboratory estimates of predatory efficiency were related to their feeding behavior in nature. Behavior differences, such as those described herein, contribute to our understanding of the mechanisms of unisexual/bisexual coexistence in Poeciliopsis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00168589
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    Paper (German National Licenses)
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  • 8
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    Widespread introgression in deep-sea hydrothermal vent mussels (2017)
    BioMed Central
    In:  BMC Evolutionary Biology, 17 (1).
    Details
    Publication Date: 2020-02-06
    Description: Background: The analysis of hybrid zones is crucial for gaining a mechanistic understanding of the process of speciation and the maintenance of species boundaries. Hybrid zones have been studied intensively in terrestrial and shallow-water ecosystems, but very little is known about their occurrence in deep-sea environments. Here we used diagnostic, single nucleotide polymorphisms in combination with one mitochondrial gene to re-examine prior hypotheses about a contact zone involving deep-sea hydrothermal vent mussels, Bathymodiolus azoricus and B. puteoserpentis, living along the Mid-Atlantic Ridge. Results: Admixture was found to be asymmetric with respect to the parental species, while introgression was more widespread geographically than previously recognized. Admixed individuals with a majority of alleles from one of the parental species were most frequent in habitats corresponding to that species. Mussels found at a geographically intermediate vent field constituted a genetically mixed population that showed no evidence for hybrid incompatibilities, a finding that does not support a previously inferred tension zone model. Conclusions: Our analyses indicate that B. azoricus and B. puteoserpentis hybridize introgressively across a large geographic area without evidence for general hybrid incompatibilities. While these findings shed new light onto the genetic structure of this hybrid zone, many aspects about its nature still remain obscure. Our study sets a baseline for further research that should primarily focus on the acquisition of additional mussel samples and environmental data, a detailed exploration of vent areas and hidden populations as well as genomic analyses in both mussel hosts and their bacterial symbionts.
    Type: Article , PeerReviewed
    Format: text
    Format: archive
    DOI: 10.1186/s12862-016-0862-2
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 9
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    Biophysical and Population Genetic Models Predict the Presence of "Phantom" Stepping Stones Connecting Mid-Atlantic Ridge Vent Ecosystems (2016)
    Elsevier
    In:  Current Biology, 26 (17). pp. 2257-2267.
    Details
    Publication Date: 2021-05-07
    Description: Highlights: • Mid-Atlantic vent mussel populations are contemporarily isolated • Population connectivity can only be maintained in a stepwise manner • Four mussel lineages exist on the Mid-Atlantic Ridge • Recolonization of perturbed vent localities is uncertain Summary: Deep-sea hydrothermal vents are patchily distributed ecosystems inhabited by specialized animal populations that are textbook meta-populations. Many vent-associated species have free-swimming, dispersive larvae that can establish connections between remote populations. However, connectivity patterns among hydrothermal vents are still poorly understood because the deep sea is undersampled, the molecular tools used to date are of limited resolution, and larval dispersal is difficult to measure directly. A better knowledge of connectivity is urgently needed to develop sound environmental management plans for deep-sea mining. Here, we investigated larval dispersal and contemporary connectivity of ecologically important vent mussels (Bathymodiolus spp.) from the Mid-Atlantic Ridge by using high-resolution ocean modeling and population genetic methods. Even when assuming a long pelagic larval duration, our physical model of larval drift suggested that arrival at localities more than 150 km from the source site is unlikely and that dispersal between populations requires intermediate habitats (“phantom” stepping stones). Dispersal patterns showed strong spatiotemporal variability, making predictions of population connectivity challenging. The assumption that mussel populations are only connected via additional stepping stones was supported by contemporary migration rates based on neutral genetic markers. Analyses of population structure confirmed the presence of two southern and two hybridizing northern mussel lineages that exhibited a substantial, though incomplete, genetic differentiation. Our study provides insights into how vent animals can disperse between widely separated vent habitats and shows that recolonization of perturbed vent sites will be subject to chance events, unless connectivity is explicitly considered in the selection of conservation areas.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/j.cub.2016.06.062
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 10
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    Population structure and connectivity in Indo-Pacific deep-sea mussels of the Bathymodiolus septemdierum complex (2015)
    Springer
    In:  Conservation Genetics, 16 (6). pp. 1415-1430.
    Details
    Publication Date: 2017-04-12
    Description: Current pressures to mine polymetallic sulfide deposits pose threats to the animal communities found at deep-sea hydrothermal vents. Management plans aimed at preserving these unusual communities require knowledge of historical and contemporary forces that shaped the distributions and connectivity of associated species. As most vent research has focused on the eastern Pacific and mid-Atlantic ridge systems less is known about Indo-Pacific vents, where mineral extraction activities are imminent. Deep-sea mussels (Bivalvia: Mytilidae) of the genus Bathymodiolus include the morphotypic species B. septemdierum, B. brevior, B. marisindicus, and B. elongatus which are among the dominant vent taxa in western Pacific back-arc basins and the Central Indian Ridge. To assess their interpopulational relationships, we examined multilocus genotypes based on DNA sequences from four nuclear and four mitochondrial genes, and allozyme variation encoded by eleven genes. Bayesian assignment methods grouped mussels from seven widespread western Pacific localities into a single cluster, whereas the Indian Ocean mussels were clearly divergent. Thus, we designate two regional metapopulations. Notably, contemporary migration rates among all sites appeared to be low despite limited population differentiation, which highlights the necessity of obtaining realistic data on recovery times and fine-scale population structure to develop and manage conservation units effectively. Future studies using population genomic methods to address these issues in a range of species will help to inform management plans aimed at mitigating potential impacts of deep-sea mining in the Indo-Pacific region.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1007/s10592-015-0750-0
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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