Archived DNA reveals fisheries and climate induced collapse of a major fishery.
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 of Atlantic cod (Gadus morhua) population dynamics in West Greenland using DNA from archived otoliths in combination with fish population and niche based modeling. We document how the interacting effects of climate change and high fishing pressure lead to dramatic spatiotemporal changes in the proportions and abundance of different genetic populations, and eventually drove the cod fishery to a collapse in the early 1970s. Our results highlight the relevance of fisheries management at the level of genetic populations under future scenarios of climate change.
Section for Marine Living Resources, National Institute of Aquatic Resources, Technical University of Denmark, Vejlsøvej 39, 8600 Silkeborg, Denmark.|Greenland Climate Research Centre, Greenland Institute of Natural Resources, Kivioq 2, PO Box 570, 3900, Nuuk, Greenland.
Sara
S
Bonanomi
Landscape Ecology, Institute of Terrestrial Ecosystems, ETH Zürich, Zürich, Switzerland.|Swiss Federal Research Institute WSL, 8903, Birmensdorf, Switzerland.
Loïc
L
Pellissier
Greenland Climate Research Centre, Greenland Institute of Natural Resources, Kivioq 2, PO Box 570, 3900, Nuuk, Greenland.|Hopkins Marine Station, Department of Biology, Stanford University, 120 Oceanview Blvd, Pacific Grove, CA 93950, USA.
Nina Overgaard
NO
Therkildsen
Greenland Climate Research Centre, Greenland Institute of Natural Resources, Kivioq 2, PO Box 570, 3900, Nuuk, Greenland.|Greenland Institute of Natural Resources, Kivioq 2, PO Box 570, 3900, Nuuk, Greenland.
Rasmus Berg
RB
Hedeholm
Greenland Climate Research Centre, Greenland Institute of Natural Resources, Kivioq 2, PO Box 570, 3900, Nuuk, Greenland.|Greenland Institute of Natural Resources, Kivioq 2, PO Box 570, 3900, Nuuk, Greenland.
Anja
A
Retzel
Section for Marine Living Resources, National Institute of Aquatic Resources, Technical University of Denmark, Vejlsøvej 39, 8600 Silkeborg, Denmark.
Dorte
D
Meldrup
Research and Development, Danish Meteorological Institute, Lyngbyvej 100, 2100 Copenhagen, Denmark.
Steffen Malskær
SM
Olsen
Section for Marine Living Resources, Technical University of Denmark, Jægersborg Allé 1, 2920 Charlottenlund, Denmark.
Anders
A
Nielsen
Marine Research Institute, Reykjavık, Iceland.
Christophe
C
Pampoulie
Section for Marine Living Resources, National Institute of Aquatic Resources, Technical University of Denmark, Vejlsøvej 39, 8600 Silkeborg, Denmark.
Jakob
J
Hemmer-Hansen
Section for Ecosystem Based Marine Management National Institute of Aquatic Resources Technical University of Denmark Jægersborg, Allé 1, 2920 Charlottenlund, Denmark.
Mary Susanne
MS
Wisz
Greenland Climate Research Centre, Greenland Institute of Natural Resources, Kivioq 2, PO Box 570, 3900, Nuuk, Greenland.|Department of Bioscience - Aquatic Biology, Ole Worms Allé 1, 8000 Aarhus, Denmark.
Peter
P
Grønkjær
Section for Marine Living Resources, National Institute of Aquatic Resources, Technical University of Denmark, Vejlsøvej 39, 8600 Silkeborg, Denmark.|Greenland Climate Research Centre, Greenland Institute of Natural Resources, Kivioq 2, PO Box 570, 3900, Nuuk, Greenland.
Einar Eg
EE
Nielsen
D000818:Animals; D057231:Climate Change; D004247:DNA / Q000235:genetics*; D017753:Ecosystem; D005398:Fisheries; D048389:Gadus morhua / Q000235:genetics*; D005828:Genetics, Population; D011157:Population Dynamics
D004247:DNA