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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of ornithology 140 (1999), S. 319-323 
    ISSN: 1439-0361
    Keywords: Ecological genetics ; genetic markers ; control region ; population allocation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung Im Wattenmeer zur Zugzeit auftretende Alpenstrandläufer gehören zu den beiden UnterartenCalidris alpina alpina undC. a. schnizii. In dieser Untersuchung wurde die wahrscheinliche Brutherkunft von Alpenstrandläufern ermittelt, die zur Hauptzugzeit im Frühjahr und Herbst im Sylt/Rømø-Wattenmeer gefangen wurden. Hierzu wurden genetische Variation und Haplotypenverteilung mittels DNA-Sequenzanalyse der mitochondrialen Kontrollregion untersucht. Ein Vergleich mit populationsgenetischen Maßzahlen der Brutpopulationen deutet an, daß es sich bei im Frühjahr (Mai) gefangenen Alpenstrandläufern vor allem um „alpina“, bei im Herbst (September) gefangenen zum großen Teil um „schinzii“ handelt. Die Untersuchung zeigt, daß die wahrscheinliche Herkunft migrierender Vögel mit Hilfe quantitativer genetischer Maßzahlen ermittelt werden kann, auch wenn exklusive genetische Marker für die Ursprungspopulationen fehlen.
    Notes: Summary In the North Sea Wadden Sea, Dunlins of the two subspeciesCalidris alpina alpina andC. a schinzii occur on migration. In this study, I investigate the putative breeding origin of Dunlins caught at the Sylt/Rømø Wadden Sea during peak migration in spring and autumn. Genetic variation and haplotype composition was assessed by sequence analysis of the mitochondrial Control Region. A comparison with population genetic measures of breeding populations suggests that Dunlins caught in spring (May) predominantly belong to “alpina” while a high percentage of specimens sampled in autumn (September) belong to “schinzii” This study demonstrates that the putative origin of migrating birds can be assessed by quantitative genetic measures, even in the absence of exclusive genetic markers.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of ornithology 138 (1997), S. 183-198 
    ISSN: 1439-0361
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Densities of feeding birds were estimated on tidal mud flats in relation to season and tide. Dunlin, Knot, Bar-tailed Godwit, Oystercatcher, Golden Plover, Common Gull, and Black-headed Gull were most abundant. Seasonal variation was significant in all species. In general, there was a correlation between bird numbers on study plots and total bird numbers in the area. Preferences for a particular sediment type and prominent occurrence at tideline in some species was explained as an adaption to differential food availability.
    Type of Medium: Electronic Resource
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  • 3
    Publication Date: 2020-01-02
    Description: The globally distributed sperm whale (Physeter macrocephalus) has a partly matrilineal social structure with predominant male dispersal. At the beginning of 2016, a total of 30 male sperm whales stranded in five different countries bordering the southern North Sea. It has been postulated that these individuals were on a migration route from the north to warmer temperate and tropical waters where females live in social groups. By including samples from four countries (n = 27), this event provided a unique chance to genetically investigate the maternal relatedness and the putative origin of these temporally and spatially co-occuring male sperm whales. To utilize existing genetic resources, we sequenced 422 bp of the mitochondrial control region, a molecular marker for which sperm whale data are readily available from the entire distribution range. Based on four single nucleotide polymorphisms (SNPs) within the mitochondrial control region, five matrilines could be distinguished within the stranded specimens, four of which matched published haplotypes previously described in the Atlantic. Among these male sperm whales, multiple matrilineal lineages co-occur. We analyzed the population differentiation and could show that the genetic diversity of these male sperm whales is comparable to the genetic diversity in sperm whales from the entire Atlantic Ocean. We confirm that within this stranding event, males do not comprise maternally related individuals and apparently include assemblages of individuals from different geographic regions.
    Type: Article , PeerReviewed
    Format: text
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  • 4
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    Unknown
    NATURE PUBLISHING GROUP
    In:  EPIC3SCIENTIFIC REPORTS, NATURE PUBLISHING GROUP, 5, pp. 1-11, ISSN: 2045-2322
    Publication Date: 2019-08-23
    Description: Genetic investigations on eukaryotic plankton confirmed the existence of modern biogeographic patterns, but analyses of palaeoecological data exploring the temporal variability of these patterns have rarely been presented. Ancient sedimentary DNA proved suitable for investigations of past assemblage turnover in the course of environmental change, but genetic relatedness of the identified lineages has not yet been undertaken. Here, we investigate the relatedness of diatom lineages in Siberian lakes along environmental gradients (i.e. across treeline transects), over geographic distance and through time (i.e. the last 7000 years) using modern and ancient sedimentary DNA. Our results indicate that closely-related Staurosira lineages occur in similar environments and lessrelated lineages in dissimilar environments, in our case different vegetation and co-varying climatic and limnic variables across treeline transects. Thus our study reveals that environmental conditions rather than geographic distance is reflected by diatom-relatedness patterns in space and time. We tentatively speculate that the detected relatedness pattern in Staurosira across the treeline could be a result of adaptation to diverse environmental conditions across the arctic boreal treeline, however, a geographically-driven divergence and subsequent repopulation of ecologically different habitats might also be a potential explanation for the observed pattern.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 5
    Publication Date: 2019-08-23
    Description: Diatom diversity in lakes of northwest Yakutia (Siberia) was investigated by microscopic and genetic analysis of surface and cored lake sediments, to evaluate the use of sedimentary DNA for paleolimnological diatom studies and to identify obscure genetic diversity that cannot be detected by microscopic methods. Two short (76 and 73 bp) and one longer (577 bp) fragments of the ribulose 1,5- bisphosphate carboxylase/oxygenase (rbcL) gene, encoding the large subunit of the rbcL, were used as genetic markers. Diverse morphological assemblages of diatoms, dominated by small benthic fragilarioid taxa, were retrieved from the sediments of each lake. These minute fragilarioid taxa were examined by scanning electron microscopy, revealing diverse morphotypes in Staurosira and Staurosirella from the different lakes. Genetic analyses indicated a dominance of haplotypes that were assigned to fragilarioid taxa and less genetic diversity in other diatom taxa. The long rbcL_577 amplicon identified considerable diversification among haplotypes clustering within the Staurosira/Staurosirella genera, revealing 19 different haplotypes whose spatial distribution appears to be primarily related to the latitude of the lakes, which corresponds to a vegetation and climate gradient. Our rbcL markers are valuable tools for tracking differences between diatom lineages that are not visible in their morphologies. These markers revealed putatively high genetic diversity within the Staurosira/Staurosirella species complex, at a finer scale than is possible to resolve by microscopic determination. The rbcL markers may provide additional reliable information on the diversity of barely distinguishable minute benthic fragilarioids. Environmental sequencing may thus allow the tracking of spatial and temporal diversification in Siberian lakes, especially in the context of diatom responses to recent environmental changes, which remains a matter of controversy.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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  • 6
    Publication Date: 2022-06-28
    Description: Changes in species’ distributions are classically projected based on their climate envelopes. For Siberian forests, which have a tremendous significance for vegetation-climate feedbacks, this implies future shifts of each of the forest-forming larch (Larix) species to the north-east. However, in addition to abiotic factors, reliable projections must assess the role of historical biogeography and biotic interactions. Here, we use sedimentary ancient DNA and individual-based modelling to investigate the distribution of larch species and mitochondrial haplotypes through space and time across the treeline ecotone on the southern Taymyr peninsula, which at the same time presents a boundary area of two larch species. We find spatial and temporal patterns, which suggest that forest density is the most influential driver determining the precise distribution of species and mitochondrial haplotypes. This suggests a strong influence of competition on the species’ range shifts. These findings imply possible climate change outcomes that are directly opposed to projections based purely on climate envelopes. Investigations of such fine-scale processes of biodiversity change through time are possible using paleoenvironmental DNA, which is available much more readily than visible fossils and can provide information at a level of resolution that is not reached in classical palaeoecology.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , NonPeerReviewed , info:eu-repo/semantics/article
    Format: application/pdf
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  • 7
    Publication Date: 2024-04-10
    Description: Sedimentary ancient DNA (sedaDNA) has proven to be a useful tool for palaeoenvironmental studies, but only a handful of studies exist so far for tropical regions. In this study we used sedaDNA to study the temporal succession of Brachionus spp. rotifer mitochondrial DNA haplotypes using two sediment cores from two climatically different alkaline-saline crater lakes from the Kenyan Rift Valley. Data were retrieved from a sediment core (dating back to AD 1800) from Lake Kageinya, located in the remote, hot and hyper-arid Suguta Valley. sedaDNA was used to study the temporal succession of mitochondrial DNA haplotypes of Brachionus spp. rotifers. The results were compared to previously published data from Lake Sonachi, a well-studied lake in the humid and colder mountainous region of Kenya near the town of Naivasha, now supported by a 210Pb age chronology. Both records extend back before the onset of substantial anthropogenic impact in these regions. The results revealed that climate—rather than anthropogenic impact—was most strongly correlated with haplotype changes in both lakes. During prolonged dry periods (such as from AD 1910 to the late AD 1960s), certain haplotypes persisted. Sudden changes and the emergence of alter native haplotypes were observed when climate became more humid or during episodes of highly variable climate (before AD 1910 and from AD 1960s onwards). Progressive changes in prevailing haplotypes during periods with variable climate could reflect local adaptation and/or be the result of immigration of new haplotypes after the eradication of previous populations during extreme environmental conditions (high temperatures, UV irradiation, pH and salinity). The results indicate that, despite adverse chemical conditions, sedaDNA in tropical lake sediments is preserved for at least a few hundred years. Therefore, its analysis provides a useful complementary palaeoenvironmental proxy for palaeolimnological reconstructions and novel insights on changes in rotifer populations through time.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 8
    Publication Date: 2023-06-27
    Keywords: 20170553; ANT-Land_2018_Sub-EIS-Obs; Area/locality; ATKA-b; Atka Bight; AWI_Paleo; Benthic fauna; Comment; DATE/TIME; Depth, relative; Digital Camera, GoPro; Distance; EIS-2a; EIS-2b; EIS-2c; EIS-2d; EIS-2e; EIS-2f; EIS-2g; EIS-3c; EIS-3e; EIS-3f; EIS-3h; EIS-4c; Ekstroem Ice Shelf; Ekstroem Ice Shelf, Antarctic - 17500m SE from Neumayer III; Ekstroem Ice Shelf, Antarctic - 3500m NW of Neumayer III; GC; GOPRO; Grab; GRAB; Gravity corer; Ice hole percussion corer, UWITEC; Ice thickness; IPUWI; LATITUDE; LONGITUDE; NEUMAYER III; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Pelagic fauna; Site; Sub-EIS-Obs; Sub-EIS-Obs2017/2018; Substrate type; Uniform resource locator/link to movie; VC; Vibro corer; Water column thickness
    Type: Dataset
    Format: text/tab-separated-values, 41 data points
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  • 9
    Publication Date: 2023-06-27
    Keywords: AGE; Alkenone per unit sediment mass; AWI_Paleo; Calculated from UK'37 (Müller et al, 1998); Calculated from UK'37 (Prahl et al., 1988); Calculated from UK'37 (Sikes and Sicre, 2002); DEPTH, sediment/rock; KALMAR II; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; PC; Piston corer; Sea surface temperature, annual mean; Shirshov Ridge; SO201/2; SO201-2-77; Sonne
    Type: Dataset
    Format: text/tab-separated-values, 112 data points
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  • 10
    Publication Date: 2023-07-10
    Keywords: 20170553; Acanthophragma polaris; Aimulosia spp.; Arachnopusia aviculifera; Arachnopusia decipiens; Aspidostoma cf. coronatum; AWI_Paleo; Buffonellaria frigida; Cellaria clavata; Cellaria coronata; Cellaria diversa; Cellaria incula; Cellaria malvinensis; Cellaria moniliorata; Cellarinella edita; Cellarinella foveolata; Cellarinella latilaminata; Cellarinella laytoni; Cellarinella margueritae; Cellarinella njegovanae; Cellarinella nodulata; Cellarinella nutti; Cellarinella rogickae; Cellarinella watersi; Chaperiopsis orbiculata; Chondriovelum adeliense; Dakariella concinna; Dendroperistoma projecta; Disporella; EIS-2a; EIS-2b; EIS-2e; EIS-2f; EIS-2g; EIS-3c; EIS-3e; EIS-3f; EIS-3g; EIS-3h; Ekstroem Ice Shelf, Antarctic - 17500m SE from Neumayer III; Ekstroem Ice Shelf, Antarctic - 3500m NW of Neumayer III; Eminooecia carsonae; Escharella mamillata; Escharoides praestita; Escharoides tridens; Event label; Fenestrulina parvipora; Filaguria spatulata; GC; Grab; GRAB; Gravity corer; Helicosiphon biscoeensis; Hippothoa flagellum; Ice hole percussion corer, UWITEC; Icelozoon lepralioides; Idmidronea sp.; IPUWI; Isoschizoporella secunda; Klugerella antarctica; Kymella polaris; Lacerna hosteensis; Lacerna watersi; Lageneschara lyrulata; Larvapora mawsoni; Melicerita obliqua; Micropora brevissima; Micropora notialis; Microporella stenoporta; NEUMAYER III; Notoplites elongatus; Osthimosia curtioscula; Osthimosia fusticula; Osthimosia malingae; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Paracellaria wandeli; Paralaeospira cavata; Paralaeospira levinseni; Paralaeospira sicula; Polirhabdotos inclusum; Protolaeospira stalagmia; Ralepria conforma; Reteporella frigida; Serpula narconensis; Smittina anecdota; Smittina antarctica; Smittina directa; Smittina incernicula; Smittina obicullata; Smittoidea albula; Spigaleos horneroides; Stomhypselosaria watersi; Sub-EIS-Obs; Sub-EIS-Obs2017/2018; Swanomia brevimandibulata; Swanomia membranacea; Systenopora contracta; Thrypticocirrus contortuplicata; Toretocheilum turbinatum; Tubulipora sp.; Turritigera cribrata; VC; Vibro corer
    Type: Dataset
    Format: text/tab-separated-values, 770 data points
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