Integrated study of benthic foraging resources for Atlantic walrus (Odobenus rosmarus rosmarus) in the Pechora Sea, south‐eastern Barents Sea

Gebruk, A.; Mikhaylyukova, P.; Mardashova, M.; Semenova, V.; Henry, L.; Shabalin, N.; Narayanaswamy, B.E.; Mokievsky, V.

Авторы: Gebruk Anna, Mikhaylyukova Polina, Mardashova Maria, Semenova Varvara, Henry Lea‐Anne, Shabalin Nikolay, Narayanaswamy Bhavani E., Mokievsky Vadim
Журнал: Aquatic Conservation: Marine and Freshwater Ecosystems
Год издания: 2020
Издательство: John Wiley & Sons Inc.
Местоположение издательства: United States
Номер статьи: aqc.3418
DOI: 10.1002/aqc.3418
Аннотация: The Atlantic walrus, Odobenus rosmarus rosmarus, forms a herd of nearly 4,000heads in the Pechora Sea (south-eastern Barents Sea). The Near Threatened statusof O. rosmarus rosmarus and the relative isolation of the Pechora Sea population, aswell as the potential impacts of human activities in the area, make it important tocharacterize key habitats, including feeding grounds, in order to protect the species.The aim of the present study was to integrate multiple sources of environmentaland biological data collected by satellite telemetry, remotely operated vehicle(ROV), and benthic grab sampling to examine the distribution and diversity of benthicforaging resources used by walrus in the Pechora Sea.Analysis of satellite telemetry data from seven males tagged on Vaigach Islandhelped to identify areas of high use by walruses near haulout sites on Matveevand Vaigach islands, and in between. Field data were collected from those feedinggrounds in July 2016 using ROV video recordings and bottom grab sampling.Analysis of 19 grab stations revealed a heterogeneous macrobenthic communityof 133 taxa with a mean biomass of 147.11 ± 7.35 g/m2. Bivalve molluscs, particularlyAstarte borealis, Astarte montagui, and Ciliatocardium ciliatum, dominated theoverall macrobenthic biomass, making up two-thirds of the total.Analysis of 16 ROV video transects showed high occurrences of mobile benthicdecapods (3.03 ± 2.74 ind./min) and provided the first direct evidence that areasactively used by walrus in the Pechora Sea overlap with the distribution of thenon-native omnivorous snow crab, Chionoecetes opilio.Integrating multiple data sources provides an early foundation for the kinds ofecosystem-based approaches needed to improve Pechora Sea resource managementand to underpin Russia’s nascent marine spatial planning initiatives. Factorsthat need to be considered in marine spatial planning include impacts on benthicfeeding grounds from offshore oil and gas development and the spread of thesnow crab.
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Integrated study of benthic foraging resources for Atlantic walrus (Odobenus rosmarus rosmarus) in the Pechora Sea, south‐eastern Barents Seaстатья

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