Характеристика кормовой базы и питание краба-стригуна опилио в Баренцевом море = Diet of the snow crab in the Barents Sea and macrozoobenthic communities in the area of its distribution
Zakharov, D.V.; Manushin, I.E.; Strelkova, N.A.; Pavlov, V.A.; Nosova, T.B. (2018). Характеристика кормовой базы и питание краба-стригуна опилио в Баренцевом море = Diet of the snow crab in the Barents Sea and macrozoobenthic communities in the area of its distribution. Труды Латвийского отделения ВНИРО = Trudy Latvijskogo Otdeleniya VNIRO 172: 70-90
In: Труды Латвийского отделения ВНИРО = Trudy Latvijskogo Otdeleniya VNIRO. VNIRO: Riga. , more
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| Keywords |
Communities
Consumption
Distribution
Feeding
Species composition
Chionoecetes opilio (Fabricius, 1788) [WoRMS]
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| Author keywords |
crab Chionoecetes opilio; Barents Sea; macrozoobenthos; invasion. |
| Authors | | Top |
- Zakharov, D.V.
- Manushin, I.E.
- Strelkova, N.A.
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- Pavlov, V.A.
- Nosova, T.B.
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| Abstract |
In recent decades the snow crab (Chionoecetes opilio) has been spreading in the eastern part of the Barents Sea and the adjacent areas of the Kara Sea. Hydrological conditions for most of the Barents Sea are very close to optimum for the snow crab, there are large areas of suitable habitat and abundant sources of food. Therefore, better understanding of trophic interactions between the snow crab and native benthic fauna is important to assess any potential impacts on the ecosystem and to enable the rational management of fisheries resources in the eastern Barents Sea. This paper investigates the snow crab diet and its feeding intensity in the Barents Sea. Data shows that the snow crab has very wide ration that includes almost all kinds of benthic invertebrates in the Barents Sea. There is a difference in the diet of females and males, juveniles and adults. Juveniles and females prefer shallow areas with communities of bivalve mollusks, males live deeper on slopes and depressions where polychaetes and crustaceans are the most abundant group. Stomach contents are analyzed to determine the species composition and the frequency of occurrence for various benthic taxa. Consumption of food was estimated and compared with data from the Russian seas of Pacific region. Total annual grazing of macrozoobenthos by the snow crab is calculated for its current distribution in the Barents Sea. Snow crab consumes at least 30 thousand tons of benthos annually, which amounts to 0.1–0.2% of the total macrozoobenthos biomass of the investigated area. Population of the snow crab provides the largest impact on the benthic communities in the north-eastern part of the Barents Sea and near the south side of the Novaya Zemlya Archipelago. |
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