engleski

Pycnogonida (Arthropoda) from Northern Adriatic Corallina officinalis Linnaeus, 1758 belts

This study examines Pycnogonida, sea spiders, collected from 54 Corallina officinalis belts in the vicinity of Pula and the Brijuni National Park. The areas include both exposed and sheltered localities as well as regions with various levels of human impact. Seven species were identified, namely Achelia echinata, A. langi, Tanystylum conirostre, Anoplodactylus angulatus, A. pygmaeus, Trygaeus communis, and Callipallene tiberi. As we used a quantifiable standard sample size of 5 cm2, we could perform a statistical analysis of species richness and abundance. The exposed low human impact sites showed a significantly higher amount of both, specimens and species than the sheltered high impact sites. C. tiberi and A. echinata showed a marked preference for exposed low impact sites while T. conirostre was equally distributed among the habitat subtypes.

Sea spider ; species distribution ; exposition ; human impact ; statistical analysis

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