Anja Retzel

Bridging species boundaries: eDNA and genetic analysis reveal hybrid settlement at the very end of American eel distribution

Magnus Wulff Jacobsen, Rasmus Nygaard, Jens Frankowski, Aja Noersgaard Buur Tengstedt et autres

Abstract Documenting species distributions and hybridization patterns is paramount for elucidating biogeography and understanding speciation processes. Here we combined genetic specimen analysis and environmental DNA (eDNA) to investigate the presence of American eel ( Anguilla rotrata ) and American × European eel …

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Greenland Cod Stocks

Anja Retzel, Frank F. Rigét, Rasmus Hedeholm

There are three cod stocks in Greenland, with distinct spawning sites inshore and offshore in West Greenland, and in East Greenland. The stocks grow and mature differently but are morphologically inseparable. Through passive egg/larval drift and active migration in larger fish, there …

Validation of pop-up satellite archival tags (PSATs) on Atlantic cod (Gadus morhua) in a Greenland fjord

Julius Nielsen, D.A. García Estévez, Søren Post, Helle Torp Christensen et autres

Traditional tagging techniques are simple and cost-effective, but inferences require recaptures and data on movement/migration are limited to a start and end position at unpredictable intervals. Pop-up satellite archival tags (PSATs) offer other opportunities, as they provide positions at pre-programmed times and …

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Year-round genetic monitoring of mixed-stock fishery of Atlantic cod (Gadus morhua); implications for management

Helle Torp Christensen, Frank F. Rigét, Anja Retzel, Erik Haar Nielsen et autres

Abstract Mixed-stock fisheries pose a challenge for fisheries management recommendations and management, as mixed stocks can lead to unintentional over- or under-exploitation of stocks, with both short- and long-term biological and economic consequences. This study demonstrates practical application and implementation of year-round …

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Improving the age reading of East Greenland Atlantic cod (Gadus morhua) by determining otolith growth zone timing and annuli widths

Mette Svantemann Lyngby, Frank F. Rigét, Anja Retzel, Rasmus Hedeholm et autres

Abstract Accurate and consistent age readings are cornerstones of age‐based assessment and management of exploited fish stocks. Otoliths are the preferred structure for age determination, often performed by counting the number of completed 001 zones. Uncertainty regarding the identification of the first …

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Historical DNA documents long‐distance natal homing in marine fish

Sara Bonanomi, Nina Overgaard Therkildsen, Anja Retzel, Rasmus Hedeholm et autres

The occurrence of natal homing in marine fish remains a fundamental question in fish ecology as its unequivocal demonstration requires tracking of individuals from fertilization to reproduction. Here, we provide evidence of long-distance natal homing (>1000 km) over more than 60 years …

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Biologiske interesseområder i Vest- og Sydøstgrønland:Kortlægning af vigtige biologiske områder

Tom Christensen, Peter Aastrup, Tenna Kragh Boye, David Boertmann et autres

Rapporten præsenterer økosystemer og nøglehabitater samt vigtige arters udbredelse, populationsstørrelser og trækkorridorer i Vest- og Sydøstgrønland. Rapporten identificerer tre typer af områder: 1) Artsspecifikke kerneområder, 2) Vigtige områder for naturtyper og andre arealbaserede temaer/ økosystemkomponenter og 3) Økologiske og biologiske interesseområder. Rapporten …

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Archived DNA reveals fisheries and climate induced collapse of a major fishery

Sara Bonanomi, Loïc Pellissier, Nina Overgaard Therkildsen, Rasmus Hedeholm et autres

Fishing and climate change impact the demography of marine fishes, but it is generally ignored that many species are made up of genetically distinct locally adapted populations that may show idiosyncratic responses to environmental and anthropogenic pressures. Here, we track 80 years …

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The history of cod in Greenland: A major fishery collapse explained by archived DNA

Einar Eg Nielsen, Sara Bonanomi, Loïc Pellissier, Nina Overgaard Therkildsen et autres

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Report of the North-Western Working Group

Gudmundur Thórdarson, Pétur Steingrund, E. Hjörleigsson, Anne Karin Magnusson et autres

Spatiotemporal distribution and composition of mixed stock fishery of Atlantic cod (Gadus morhua) in West Greenlandic waters based on retrospective genetic analysis

Sara Bonanomi, Nina Overgaard Therkildsen, Rasmus Hedeholm, Anja Retzel et autres

No abstracts are to be cited without prior reference to the author. During the last century Atlantic cod Gadus morhua stocks have declined dramatically in West Greenlandic waters (Fig1). The depletion of stocks has been ascribed to failure of sustainable fishery management …

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Spatiotemporal SNP analysis reveals pronounced biocomplexity at the northern range margin of A tlantic cod G adus morhua

Nina Overgaard Therkildsen, Jakob Hemmer‐Hansen, Rasmus Hedeholm, Mary Susanne Wisz et autres

Accurate prediction of species distribution shifts in the face of climate change requires a sound understanding of population diversity and local adaptations. Previous modeling has suggested that global warming will lead to increased abundance of Atlantic cod (Gadus morhua) in the ocean …

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