Ostracod assemblages from the upper part of the mini-core Ash-2009-08 that were retrieved from the inner shallow-water shelf of the northeastern Black Sea off the town of Gelendzhik were analyzed. The studied part of the core recovered sediments of the previous ∼70 years. A proposed new ecologo-ethological method for the analysis of fossil biotic assemblages takes behavioral features of animals, along with their ecological preferences, into account. Particular attention is paid to the juvenile/adult ratio of each species; ostracod species are grouped depending on the biotopes that they prefer. This allows one to distinguish autochthonous species, represented mainly by adult specimens, from the species that penetrate from nearby biotopes, which are represented mainly or exclusively by instars. Five groups were differentiated according to their preferred biotopes: pelobionts, aleurobionts, psammobionts, suprabionts, and stygobionts. The findings of stygobionts in marine sediments are discussed. Only aleurobionts characterize the environment in situ, whereas the other groups, being stochastic elements, reflect a general diversity of the local fauna. The ostracod assemblages (number of species and their ratio) remained stable during the period of studies. Only two intervals of an increase in the total ostracod abundance were recorded. The maximum abundance in the 1940s–1960s results from eutrophication, whereas the high abundance values in the 1990s are probably associated with high bottom-water dynamics.
Russian Journal of Marine Biology – Springer Journals
Published: Jan 7, 2015
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