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Mollusca

Spatial and temporal aspects of the lagoon cockle and its commensal amphipod in the southwestern Caspian Sea

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Pages 63-72 | Published online: 28 Feb 2013
 

Abstract

Bivalves and amphipods represent the two most species-rich groups of the Caspian Sea invertebrate fauna. This diversification has led to adaptations of which the commensalism of the amphipod Cardiophilus baeri inside the lagoon cockle Cerastoderma glaucum is studied here. Animals were sampled at three depths: at 2, 5, and 10 metres, and in different seasons during 1999 and 2000. To study the influence of the amphipod upon the growth of the lagoon cockle,comparisons were made between shell size, biomass, and the number of individuals for eight different regions where the amphipod Cardiophilus was present and where it was absent.

Kurzfassung

Muscheln (Bivalvia) und Flohkrebse (Amphipoda) stellen im Kaspischen Meer die artenreichsten Gruppen von Invertebraten dar. Diese Diversifizierung hat zu einer Reihe von Anpassungen geführt, von denen hier der Kommensalismus des Flohkrebses Cardiophilus baeri im Inneren der Lagunen-Herzmuschel Cerastoderma glaucum untersucht wird. Tiere wurden in Tiefen von 2, 5 und 10 Metern sowie in zwei verschiedenen Jahren (1999 und 2000) gesammelt. Um den Einfluß des Flohkrebses auf das Wachstums der Muschel herauszufinden, wurden in acht verschiedenen Regionen, in denen Cardiophilus vorkommt bzw. fehlt, Vergleiche zwischen Schalengröße, Biomasse und der Bestandsdichte angestellt.

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