Polar cod (Boreogadus saida) of the Siberian Arctic: Distribution and biology

Мазникова, О. А.; Emelin, Pavel O.; Baitalyuk, Alexey A.; Vedishcheva, E. V.; Trofimova, A. O.; Орлов, А. М.

doi:10.1016/j.dsr2.2022.105242

Cited by 5 publications

(2 citation statements)

References 52 publications

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“…), and chaetognaths (Parasagitta elegans) (Fortier et al, 2001;Pinchuk and Eisner, 2017;Grigor et al, 2020). Juvenile Arctic cod, as a visual predator, is mainly distributed in water temperatures between 1 and 6°C (Vestfals et al, 2019;Maznikova et al, 2023). However, the water temperature environment in our study region was less than 0 °C (Figure 5A), indicating a significant difference from the typical temperature range where they are known to be abundant.…”

Section: Vertical Distribution Of Arctic Copepodsmentioning

confidence: 70%

Distinct vertical behavior of key Arctic copepods following the midnight sun period in the East Siberian continental margin region, Arctic Ocean

et al. 2023

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Diel vertical migration (DVM) of zooplankton plays a vital role in biological carbon pump and food web interactions. However, there is considerable debate about the DVM of zooplankton in response to environmental changes in the Arctic Ocean. We investigated DVM behavior in the key Arctic copepods Calanus glacialis, Calanus hyperboreus, and Metridia longa following the midnight sun period in the East Siberian continental margin region. The two Calanus species showed non-DVM behaviors, whereas M. longa showed a typical DVM pattern consistent with the solar radiation cycle. Additionally, these species showed different vertical distributions. Calanus glacialis was distributed at depths above 20 m in the warm fresh water, where the highest density gradient was observed. Calanus hyperboreus was distributed at depths between 30 and 55 m in the cold salty water, where a high contribution of micro phytoplankton and the subsurface chlorophyll maximum (SCM) layer were observed. M. longa was found across a broader range of temperature and salinity than both Calanus species, and it was distributed in the upper water column, where the SCM layer was observed at night and at depths between 100 and 135 m in the daytime. These results imply that M. longa can be well adapted to the changing Arctic Ocean environment, where sea ice loss and ocean warming are ongoing, whereas C. hyperboreus can be the most vulnerable to these changes. These findings provide important information for understanding variations in the vertical distributions of key copepod species in the rapidly changing Arctic marine environment.

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Section: Vertical Distribution Of Arctic Copepodsmentioning

confidence: 70%

Distinct vertical behavior of key Arctic copepods following the midnight sun period in the East Siberian continental margin region, Arctic Ocean

et al. 2023

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“…While the last NMFS beam trawl survey in the Chukchi Sea occurred in 2019, the most recent Chukchi Sea NMFS otter trawl survey occurred in 2012. Within the same range of time (i.e., the last ten years), there have been significant poleward shifts in the distributions of many subarctic taxa common to the Bering Sea (Kotwicki and Lauth, 2013 2019; Maznikova et al, 2023a) but previously seldom observed in the Chukchi Sea, including many Bering Sea gadids like walleye pollock (Datsky et al, 2022;Wildes et al, 2022). With continued sampling of the region, the design of a STRS survey could be easily modified to reflect the species distributions observed in more recent years.…”

Section: Discussionmentioning

confidence: 99%

Evaluating potential changes to the US Chukchi Sea bottom trawl survey design via simulation testing

et al. 2023

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The US Chukchi Sea consists of the waters off the northwest of Alaska and is a naturally dynamic ice-driven ecosystem. The impacts from climate change are affecting the Arctic marine ecosystem as well as the coastal communities that rely on healthy marine ecosystems. In anticipation of increased ecosystem monitoring in the area, there is an opportunity to evaluate improved sampling designs for future ecological monitoring of the Chukchi Sea, an area that is sampled less comprehensively compared to other regions in Alaska. This analysis focused on standardized NOAA-NMFS-AFSC bottom trawl surveys (otter and beam trawls) and three types of survey designs: simple random, stratified random, and systematic. First, spatiotemporal distributions for 18 representative demersal fish and invertebrate taxa were fitted using standardized catch and effort data. We then simulated spatiotemporal taxon densities to replicate the three survey design types to evaluate design-based estimates of abundance and precision across a range of sampling effort. Modest increases in precision were gained from stratifying the design when compared to a simple random design with either similar or lower uncertainty and bias of the precision estimates. There were often strong tradeoffs between the precision and bias of the systematic estimates of abundance (and associated variance) across species and gear type. The stratified random design provided the most consistent, reliable, and precise estimates of abundance indices and is likely to be the most robust to changes in the survey design. This analysis provides a template for changing bottom trawl survey designs in the Chukchi Sea and potentially other survey regions in Alaska going forward and will be important when integrating new survey objectives that are more ecosystem-focused.

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Armored fish in cold polar waters: New information on the Arctic alligatorfish Aspidophoroides olrikii (Agonidae, Perciformes, Teleostei) from the Kara Sea (Siberian Arctic)

Tokranov,

Emelin,

Orlov

2024

Polar Biol

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Polar cod (Boreogadus saida) of the Siberian Arctic: Distribution and biology

Cited by 5 publications

References 52 publications

Distinct vertical behavior of key Arctic copepods following the midnight sun period in the East Siberian continental margin region, Arctic Ocean

Distinct vertical behavior of key Arctic copepods following the midnight sun period in the East Siberian continental margin region, Arctic Ocean

Evaluating potential changes to the US Chukchi Sea bottom trawl survey design via simulation testing

Armored fish in cold polar waters: New information on the Arctic alligatorfish Aspidophoroides olrikii (Agonidae, Perciformes, Teleostei) from the Kara Sea (Siberian Arctic)

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