COMPARISON STUDY OF THE MODERN OSTRACOD ASSOCIATIONS IN THE KARA AND LAPTEV SEAS: ECOLOGICAL ASPECTSстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Recent ostracod assemblages were investigated from coretop sediment samples collected in the eastern Kara Sea from water
depths down to 300 m. A total of 45 species were identified, 27 of them were reported for the Kara Sea for the first time. The Kara
Sea data were compared with our results on the distribution of ostracods in the eastern Laptev Sea. The spatial distribution of recent
taxa and the ecological groupings demonstrate a clear relation to dominant environmental factors which range from estuarine to
full-marine conditions. Four assemblages related to average summer bottom water salinities were established: (1) a freshwater
assemblage from the inner estuaries of the Ob' and Yenisei rivers with salinities less than 2 and from thermokarst lagoons of the
southern Laptev Sea coast with strong salinization in winter; (2) a brackishwater assemblage of the outer estuaries of the Ob' and
Yenisei rivers with salinities up to 26; (3) a mixed euryhaline–marine assemblage dominated by euryhaline species Paracyprideis
pseudopunctillata and Heterocyprideis sorbyana from the inner shelf river-affected zone of the Kara and Laptev seas, where
salinities range between 26 and 32; (4) a taxonomically diverse marine assemblage dominated by shallow-water marine taxa from
the northern parts of the Kara and Laptev shelves and upper continental slope with stable bottom environments and a salinity higher
than 32. Abundant euryhaline species found at greater water depths are identified as part of an ice-rafted assemblage. They are
possibly entrained into the newly formed fast ice during autumn storms and freeze-up period and then transported to the distal
open-sea areas during summer.