Resource-driven colonization by cod in a high Arctic food web.

Autor: Johannesen E; Institute of Marine Research Nordnes Norway., Yoccoz NG; Department of Arctic and Marine Biology UiT The Arctic University of Norway Tromsø Norway.; Norwegian Institute for Nature Research (NINA) Fram Centre Langnes Norway., Tveraa T; Norwegian Institute for Nature Research (NINA) Fram Centre Langnes Norway., Shackell NL; Ocean Sciences Division Bedford Institute of Oceanography Darthmouth Canada., Ellingsen KE; Norwegian Institute for Nature Research (NINA) Fram Centre Langnes Norway., Dolgov AV; Polar Branch of the Federal Russian Research Institute of Fisheries and Oceanography (PINRO) Murmansk Russia.; Murmansk State Technical University branch of Federal State Educational Institution of Higher Education Murmansk Russia.; Tomsk State University Tomsk Russia., Frank KT; Ocean Sciences Division Bedford Institute of Oceanography Darthmouth Canada.
Jazyk: angličtina
Zdroj: Ecology and evolution [Ecol Evol] 2020 Nov 23; Vol. 10 (24), pp. 14272-14281. Date of Electronic Publication: 2020 Nov 23 (Print Publication: 2020).
DOI: 10.1002/ece3.7025
Abstrakt: Climate change is commonly associated with many species redistributions and the influence of other factors may be marginalized, especially in the rapidly warming Arctic.The Barents Sea, a high latitude large marine ecosystem in the Northeast Atlantic has experienced above-average temperatures since the mid-2000s with divergent bottom temperature trends at subregional scales.Concurrently, the Barents Sea stock of Atlantic cod Gadus morhua, one of the most important commercial fish stocks in the world, increased following a large reduction in fishing pressure and expanded north of 80°N.We examined the influence of food availability and temperature on cod expansion using a comprehensive data set on cod stomach fullness stratified by subregions characterized by divergent temperature trends. We then tested whether food availability, as indexed by cod stomach fullness, played a role in cod expansion in subregions that were warming, cooling, or showed no trend.The greatest increase in cod occupancy occurred in three northern subregions with contrasting temperature trends. Cod apparently benefited from initial high food availability in these regions that previously had few large-bodied fish predators.The stomach fullness in the northern subregions declined rapidly after a few years of high cod abundance, suggesting that the arrival of cod caused a top-down effect on the prey base. Prolonged cod residency in the northern Barents Sea is, therefore, not a certainty.
Competing Interests: The authors declare no conflict of interest.
(© 2020 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd.)
Databáze: MEDLINE
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