<Emphasis Type="Italic">Caulerpa racemosa</Emphasis> var. <Emphasis Type="Italic">cylindracea</Emphasis> as a potential source of organic matter for benthic consumers: evidences from a stable isotope analysis |
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Authors: | Daniela Casu Giulia Ceccherelli Nicola Sechi Paola Rumolo Gianluca Sarà |
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Institution: | (1) Dipartimento di Botanica ed Ecologia Vegetale, University of Sassari, via Muroni 25, 07100 Sassari, Italy;(2) AMC-CNR, Calata Porta di Massa, Porto di Napoli, 80133 Naples, Italy;(3) Dipartimento di Ecologia, University of Palermo, Viale delle Scienze Ed. 16, 90128 Palermo, Italy |
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Abstract: | Caulerpa racemosa var. cylindracea has been invading various types of substrates in wide areas throughout the Mediterranean Sea. However, the effects of the
distribution of this alga on zoobenthos are scanty. The aim of this study was to evaluate the effects of C. racemosa invasion on the feeding habits of some zoobenthic taxa inhabiting the upper infralittoral rocky shores. This was done by identifying the isotopic N and C ratios of several potential food sources and testing differences in isotope
composition among the taxa collected from areas invaded and not-invaded areas by C. racemosa. Results suggest that C. racemosa detritus was a significant food source for the polychaete Syllis prolifera, the gammarid Corophium sextonae and the gastropods Cerithium rupestre and Pisinna glabrata. They would also suggest that stable carbon and nitrogen isotope ratios deserve further attention as a possible valuable
approach to understand the overall effect of C. racemosa spread on the trophic interactions among the species. |
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