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Caulerpa racemosa var.cylindracea as a potential source of organic matter for benthic consumers: evidences from a stable isotope analysis
Casu, D.; Ceccherelli, G.; Sechi, N.; Rumolo, P.; Sarà, G. (2009). Caulerpa racemosa var.cylindracea as a potential source of organic matter for benthic consumers: evidences from a stable isotope analysis. Aquat. Ecol. 43(4): 1023-1029. https://hdl.handle.net/10.1007/s10452-008-9223-6
In: Aquatic Ecology. Springer: Dordrecht; London; Boston. ISSN 1386-2588, more
Peer reviewed article  

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Keyword
    Marine
Author keywords
    Caulerpa racemosa; Feeding habits; Food source; Stable isotope ratio;Zoobenthos

Authors  Top 
  • Casu, D.
  • Ceccherelli, G.
  • Sechi, N.
  • Rumolo, P.
  • Sarà, G.

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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