Diet and physiological responses of Spondyliosoma cantharus (Linnaeus, 1758) to the Caulerpa racemosa var. cylindracea invasion

作者：Box Antonio^*; Deudero Salud; Sureda Antoni; Blanco Andreu; Alos Josep; Terrados Jorge; Maria Grau Antoni; Riera Francisco

来源：Journal of Experimental Marine Biology and Ecology, 2009, 380(1-2): 11-19.

DOI：10.1016/j.jembe.2009.08.010

• Antioxidant enzymes
• Balearic Islands
• Caulerpa racemosa
• Spondyliosoma cantharus
• Stable isotopes

Marine invasions are a worldwide problem that involves changes in communities and the acclimation of organisms to them. The invasive Chlorophyte Caulerpa racemosa var. cylindracea is widespread in the Mediterranean and colonises large areas from 0 to 70 m in depth. The omnivorous fish Spondyliosoma cantharus presents a high frequency of occurrence of C. racemosa in the stomach contents at invaded areas (76.3%) while no presence of C racemosa was detected in control areas. The isotopic composition of muscle differed significantly between invaded and non-invaded sites for delta(13)C (-16.67 parts per thousand +/- 0.09 and -17.67 parts per thousand +/- 0.08, respectively), delta(15)N (10.22 parts per thousand +/- 0.22 and 9.32 parts per thousand +/- 0.18, respectively) and the C:N ratio (2.01 +/- 0.0002 and 1.96 +/- 0.009, respectively). Despite the high frequency of occurrence of C racemosa in the stomach contents of S. cantharus and its important contribution to the delta(13)C source (20.7% +/- 16.2), the contribution of C. racemosa to the delta(15)N in S. cantharus food sources was very low (6.6% +/- 5.8). Other invertebrate prey such as decapods and polychaetes were more important contributors to the delta(15)N source at both invaded and non-invaded sites. Activation of enzymatic pathways (catalase, superoxide dismutase, glutathione-s-tranferase, 7-ethoxy resorufin O-de-ethylase) but not a significant increase in lipid peroxidation MDA (0.49 +/- 0.01 nmol/mg prot at non-invaded and 0.53 +/- 0.01 nmol/mg prot at invaded sites) was observed in S. cantharus individuals living in C. racemosa-invaded sites compared with control specimens. The low delta(15)N contribution values of C racemosa by S. cantharus together with the toxicity demonstrated by the activation of the antioxidant defences and the important contribution of invertebrate prey to the delta(15)N could mean that the ingestion of C racemosa by S. cantharus might be unintentional during the predation of invertebrate preys living underneath the entanglement of the C racemosa fronds and stolons mats.

• 出版日期2009-11-15