Five different micro-habitats were checked for ostracod distribution in a brackish shallow water site in the mesohaline salinity range. Ostracods were counted semi-quantitatively and their speed of movement and behaviour were observed. ~he micro-habitats are sandy and muddy sediment (epifaunal and shallow infaunal) as well as filamentous green algae, Fucus vesiculosus (macro-algae) and Mytilus edulis (mussel) colonies. Within the nine documented ostracod species are five species dominating the different microhabitats: Leptocythere psammophila and Cyprideis rotosa clearly dominate the sediment (L. psammophila shallow infaunal and C. rotosa infaunal to epifaunal). In most sediment samples, Loxoconcha el@tica was found in small numbers, but it is frequent on all other substrates, especially the mussel colonies. Xestoleberis nitida is typical for mussel colonies and Semicytherura nigrescem for macro-algae.
KurzfassungFª unterschiedliche Mikrohabitate wurden in einem mesohalinen Flachwassergebiet an der sª Ostseekª vor der Insel Poel aufihre Ostrakodenfaunen untersucht. Die Ostrakoden wurden semiquantitativ in ihrer H~iufigkeit erfasst und ihr Verhalten sowie ihre Geschwindigkeit in den Mikrohabitaten beobachtet. Bei den fª untersuchten Mikrohabitaten handelt es sich um sandiges und schlickiges Oberfliichensediment (flach infaunal und epifaunal), f'~idige Grª Blasentang und Miesmuschelkolonien. Unter den neun nachgewiesenen Ostrakodenarten sind sechs Arten hiiufig und f'ª verschiedene
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