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Structure and dynamics of the northern Adriatic Sea soft-bottom echinoderms fauna (Echinodermata)

Qualitative and quantitative composition of echinoderms was studied during 2003 in the northern Adriatic offshore area at stations SJ 005, SJ 007 and SJ 107. Sediment samples for echinoderms analysis were collected seasonally in February, May, August and October by a Van Veen grab (surface area 0, 1 m2). Examinations involved the main population (density, dominance, frequency, spatial and temporal distribution) and coenological parameters (composition, abundance, species richness, eveness, diversity and similarity).The results were subjected to univariate, multivariate and distributional analyses. In total, 17 species, 12 genera and 10 families were found. At all stations ophiurids dominated and the most abundant species was Amphiura filiformis. Stations compared were characterised by similar environmental features and belonged to the same community Schizaster chiajei. A very close pattern was found out related to the spatial and temporal dynamics of echinoderms fauna. Notable differences were found in comparison to the results of previous investigation that concerned postanoxic period (1989-1991). The results pointed out the stability of echinoderms fauna and the prevalence of favourable environmental conditions.

echiniderms; qualitative and quantitative composition; structure; dynamics; northern Adriatic

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