Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.1/4052
Título: Algal cover and sea urchin spatial distribution at Madeira Island (NE Atlantic)
Autor: Alves, F.
Chícharo, Luís
Serrão, Ester
Abreu, A. D.
Palavras-chave: Sea urchins
Madeira Island
Algae
Diadema antillarum
Distribution
Data: 2001
Editora: Consejo Superior de Investigaciones Científicas
Citação: Alves, F.M.A.; Chicharo, L.M.; Serrão, E.A.; Abreu, A.D.Algal cover and sea urchin spatial distribution at Madeira Island (NE Atlantic), Scientia Marina, 65, 4, 383-392, 2001.
Resumo: This study describes sea urchin spatial distribution in relation to environmental factors, and the relationship between Diadema antillarum density and algal abundance. Twenty-three transects around Madeira Island were surveyed by scuba divers, and sea urchin density and algal cover were determined in situ. Sampling sites along these transects were characterised in terms of distance from the tide line, water depth, substratum type, bottom declivity and water turbulence. Diadema antillarum was the dominant sea urchin species. Paracentrotus lividus and Arbacia lixula occurred at shallower depths (2-6 m), contrasting with the distribution of Sphaerechinus granularis, which occurs among D. antillarum (4-20 m). Surveys found two alternative types of communities on rocky shores: 1) a community with high algal cover and low numbers of sea urchins, along the north and south-west coasts and; 2) a community with little algal cover and high densities of sea urchins, along the south-east coast. Macroalgal cover and D. antillarum densities were inversely correlated (adjusted R2=75.6%; n = 429; p< 0.05). The results showed that water turbulence was the most important factor limiting the distribution of D. antillarum on rocky substrates. We propose a multiple non-linear regression model (using backward stepwise analysis) to explain D. antillarum abundance on the rocky shores: D. antillarum/m2 (??)= 0.121 - 0.209 distance from shore (in m) (??) + 2.052 water depth (in m) (??) - 1.778 water turbulence level (??) - 0.007 water turbulence level4 (??); where ?? indicates data are square-root transformed (adjusted R2 = 60.99%; n = 454; p< 0.05).
Peer review: yes
URI: http://hdl.handle.net/10400.1/4052
DOI: http://dx.doi.org/ 10.3989/scimar.2001.65n4383
ISSN: 0214-8358
Versão do Editor: http://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/670/686
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CCM2-Artigos (em revistas ou actas indexadas)

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