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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Spatial distribution of small benthic invertebrates in rocky upper infralittoral at the Asinara Island (NW Mediterranean): A pilot study (2004)
Auteurs :	D. Casu, Auteur ; G. Ceccherelli, Auteur ; A. Castelli, Auteur
Type de document :	Article
Dans :	Vie et Milieu - Life and Environment (54(4) décembre 2004)
Article en page(s) :	239-245
Langues:	Anglais
Résumé :	A pilot study was carried out in the Asinara Island National Park (NW Mediterranean) at Giordano Bay to investigate the spatial variation in abundance of small invertebrates inhabiting upper infralittoral hard bottoms covered by algae. Six experimental areas were randomly chosen within a mixed assemblage of erect algae at the bay. Samples of benthic fauna were collected by cutting through the algae to the rock surface with open-ended plastic cylinders of 40, 60 and 80 mm in diameter (small, medium and large size, respectively). The abundance of the most common taxa, for both macrofaunal and meiofaunal components, was found unaffected by the size of the sampling unit, suggesting that the distribution of organisms is spatially heterogeneous and that the average distance among aggregation of benthic assemblages is larger than the sampling unit sizes considered. Further, taxonomic resolution used is discussed as a possible cause for the results obtained. Cost-benefit analyses have determined the optimal allocation of resources to use in future sampling of small benthic invertebrates at the site.
En ligne :	https://wwwphp.obs-banyuls.fr/Viemilieu/index.php/volume-54-2004/54-issue-4.html

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