Ecology of Arctic cod Boreogadus saida (Gadiformes, Gadidae) and its fishery potential in Kara Sea

Antonov, N. P.; Kuznetsov, V. V.; Kuznetsova, E. N.; Tatarnikov, V. A.; Belorustseva, Svetlana; Митенкова, Л. В.

doi:10.1134/s0032945217050022

Cited by 7 publications

(4 citation statements)

References 3 publications

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“…Differences in gonadal development may exist between populations inhabiting fjords of Svalbard under the influence of different water masses (Nahrgang et al, 2014). Furthermore, a wide range of age composition, size and growth rates between polar cod in the Barents and Kara Seas might indicate their origin from distinct populations (Antonov et al, 2017). In addition, various morphotypes of polar cod regarding body morphometry and coloration have been described in the Kara, Laptev and Pechora Seas (Chernova, 2018;Moskalenko, 1964).…”

Section: Discussionmentioning

confidence: 99%

“…So far, most research suggests that polar cod form genetic sub-populations at the basin scale at most (Fevolden et al, 1999;Pálsson et al, 2009;Wilson et al, 2017). Yet, some local retention and/or varying selection regimes between fjord and (different) oceanic habitats as indicated in (Antonov et al, 2017). In addition, various morphotypes of polar cod regarding body morphometry and coloration have been described in the Kara, Laptev and Pechora Seas (Chernova, 2018;Moskalenko, 1964).…”

Section: Discussionmentioning

confidence: 99%

“…Accordingly, polar cod in the Barents Sea likely belong to local populations also inhabiting the White and Kara Seas (Bergstad et al ., 1987; Ponomarenko, 1967). It is hypothesized that polar cod from the Kara Sea actively migrate to the Barents Sea for propagation (Antonov et al ., 2017), with major spawning grounds along the Novaya Zemlya archipelago (Ponomarenko, 2000). Yet, polar cod also seem to spawn locally in the Kara Sea (Moskalenko, 1964).…”

Section: Discussionmentioning

confidence: 99%

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High gene flow in polar cod (Boreogadus saida) from West‐Svalbard and the Eurasian Basin

Maes

Christiansen

Mark

et al. 2021

Journal of Fish Biology

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The current and projected environmental change of the Arctic Ocean contrasts sharply with the limited knowledge of its genetic biodiversity. Polar cod Boreogadus saida (Lepechin, 1774) is an abundant circumpolar marine fish and ecological key species. The central role of polar cod in the Arctic marine food web warrants a better understanding of its population structure and connectivity. In this study, the genetic population structure of 171 juveniles, collected from several fjords off West-Svalbard (Billefjorden, Hornsund and Kongsfjorden), the northern Sophia Basin and the Eurasian Basin of the Arctic Ocean, was analysed using nine DNA microsatellite loci.Genetic analyses indicated moderate to high genetic diversity, but absence of spatial population structure and isolation-by-distance, suggesting ongoing gene flow between the studied sampling regions. High levels of connectivity may be key for polar cod to maintain populations across wide spatial scales. The adaptive capacity of the species will be increasingly important to face challenges such as habitat fragmentation, ocean warming and changes in prey composition. In view of a limited understanding of the population dynamics and evolution of polar cod, a valuable next step to predict future developments should be an integrated biological evaluation, including population genomics, a life-history approach, and habitat and biophysical dispersal modelling.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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High gene flow in polar cod (Boreogadus saida) from West‐Svalbard and the Eurasian Basin

Maes

Christiansen

Mark

et al. 2021

Journal of Fish Biology

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“…Commercial fisheries for B. saida have since reduced considerably, though there is potential interest in expanding fisheries to new regions (e.g. Kara Sea; Antonov et al., 2017). Other countries ceased fishing for these species by the early 1980s, and there is currently a moratorium on large‐scale commercial fishing in the Central Arctic Ocean (Vylegzhanin et al., 2020) and the US‐Canadian Beaufort Sea due to insufficient data (Ayles et al., 2016), although small coastal subsistence harvest takes place for these species in some Arctic communities (Prokhorova, 2013; Snoeijs‐Leijonmalm et al., 2020; Wienerroither et al., 2011).…”

Section: Introductionmentioning

confidence: 99%

Cod movement ecology in a warming world: Circumpolar arctic gadids

et al. 2021

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Understanding fish movement in the Arctic is paramount during the current era of rapidly warming seas, receding sea ice and associated shifting species distributions and fishing effort. We synthesized the literature and identified key knowledge gaps on the movement ecology of Arctic cod (Boreogadus saida) and Polar/Ice cod (Arctogadus glacialis, both Gadidae) in the context of climate change. Standardized web-based English-language literature searches yielded 51 articles directly relevant and 122 indirectly relevant for the movement ecology of these species combined. Most articles were primarily relevant to B. saida (85% of total filtered articles), occurred during open water season (49/38%) with focus on distribution (32/22%), predators (30/22%), seasonal spawning/feeding movements (22/19%), sea ice association (22/26%), climate change (20/15%) and vertical movements (17/19%) with few focused on horizontal dynamics (3/0%; B. saida/A. glacialis, respectively). Disproportionate data resolution has resulted in greater predictive power of movement models for the European (29% of articles) and North American (86%) Arctic regions relative to the logistically challenging Central Arctic Ocean and Russian-Siberian Arctic shelves (both 7%). The movements of circumpolar Arctic gadids are dependent on complex dynamics that include regional currents, the longevity of ice-flows and polynyas, water stratification and coastal hydrology. Dependence on these interactive and often co-dependent processes highlights major pathways and barriers to movement and distribution at higher latitudes. Despite a recent increase in impactful research, there is a critical need for more direct research on circumpolar gadid movements to aid understanding of climate change impacts on Arctic ecosystems and fisheries.

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