%0 Journal Article
%T Macrofauna assemblages in a XVIIth century shipwreck: comparison with those on natural reefs and sandy bottoms
%A Rui Coelho
%A Pedro Monteiro
%A David Abecasis
%A Jean Yves Blot
%J Brazilian Journal of Oceanography
%D 2012
%I Universidade de S?o Paulo
%X The macrofauna assemblages of a XVIIth century shipwreck off southern Portugal were studied and compared with those of nearby natural reefs and sandy bottoms, by underwater visual census. A total of 11 173 specimens of 224 different fauna taxa and 12 phyla were recorded. Natural reefs had the highest density of specimens (35 122 / 1000 m2) followed by the shipwreck (21 392 / 1000 m2) and the sandy bottoms (3771 / 1000 m2). Three biodiversity indices were estimated (Margalef, Shannon-Wiener and Pielou), with the natural reefs showing the highest values. However, the shipwreck presented values relatively similar to those of the natural reefs for the Shannon-Wiener and Pielou indices. The three habitats were clearly distinguishable by multivariate statistical analysis, with the average dissimilarity between sand and shipwreck, and between sand and natural reefs being much higher than that between the shipwreck and the natural reefs. The shipwreck had higher abundances of some commercially important species, such as the pouting Trisopterus luscus, European conger Conger conger, and common spider crab Maja squinado, as well as some vulnerable and threatened species such as the pink seafan Eunicella verrucosa. The results presented emphasize the importance of this habitat on the southern Portuguese coast. As comunidades de macrofauna de um naufr¨¢gio do s¨¦culo XVII ocorrido ao largo da costa Sul de Portugal, foram estudadas e comparadas com recifes naturais e fundos de areia atrav¨¦s de census visuais subaqu¨¢ticos. Foram registados 11 173 esp¨¦cimes pertencentes a 224 taxa faun¨ªsticos e 12 phyla. Os recifes naturais apresentaram a maior densidade de esp¨¦cimes (35 122 / 1000 m2) seguidos do naufr¨¢gio (21 392 / 1000 m2) e dos fundos de areia (3771 / 1000 m2). Foram calculados tr¨ºs ¨ªndices de biodiversidade (Margalef, Shannon-Wiener e Pielou), com os recifes naturais que apresentarem os valores mais elevados. No entanto, o naufr¨¢gio mostrou valores relativamente semelhantes aos fundos rochosos nos ¨ªndices de Shannon-Wiener e Pielou. Os tr¨ºs habitats foram separados por estat¨ªstica multivariada, com a dissimilaridade m¨¦dia entre areia e naufr¨¢gio, e entre areia e recifes naturais sendo muito superior ¨¤ dissimilaridade entre os recifes naturais e o naufr¨¢gio. O naufr¨¢gio apresentou elevada abundancia de algumas esp¨¦cies comercialmente importantes, como a faneca Trisopterus luscus, o safio Conger conger e a santola Maja squinado, assim como de esp¨¦cies vulner¨¢veis e amea adas como a gorgonia rosa Eunicella verrucosa. Os resultados apresentados real am a importancia de
%K Recifes artificiais
%K Biodiversidade
%K Monitoriza  o visual subaqu¨¢tica
%K An¨¢lise multivariada
%K Nordeste Atlantico
%K Artificial reefs
%K Biodiversity
%K Underwater visual survey
%K Multivariate analyses
%K NE Atlantic
%U http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-87592012000400004