Universidade Federal do Paraná, Caixa Postal 19020, CEP 81531-980 Curitiba, PR, Brazil; GPIc - Grupo de Pesquisas em Ictiofauna, Museu de História Natural Capão da Imbuia, Rua Prof. Benedito Conceição, 407, 82810-080, Curitiba, PR, Brazil.
J Fish Biol. 2014 Aug;85(2):246-63. doi: 10.1111/jfb.12417. Epub 2014 Jun 12.
The diets of six shark species, Sphyrna lewini, Sphyrna zygaena, Carcharhinus obscurus, Carcharhinus limbatus, Rhizoprionodon lalandii and Galeocerdo cuvier, were investigated in a subtropical coastal ecosystem of southern Brazil. Stomach content data were obtained to assess foraging niche segregation and ontogenetic shifts in the diets of these sharks. Five of the shark species off the Paraná coast were ichthyophagous, with the exception of S. zygaena, which was teutophagous. With the exception of G. cuvier, which had a generalist diet, the other five species displayed specialization in their feeding. Ontogenetic shifts were observed in C. obscurus and S. lewini with large individuals consuming elasmobranchs. Owing to the diet overlap between C. obscurus and S. lewini, C. obscurus and C. limbatus and R. lalandii and C. limbatus, future studies on the spatial and temporal distributions of these species are needed to understand the extent of competitive interactions.
对巴西南部亚热带沿海生态系统中的六种鲨鱼物种（包括 Sphyrna lewini、Sphyrna zygaena、Carcharhinus obscurus、Carcharhinus limbatus、Rhizoprionodon lalandii 和 Galeocerdo cuvier）的饮食进行了调查。通过胃内容物数据来评估这些鲨鱼的觅食生态位分离和食性随个体发育的变化。在巴拉那海岸发现，五种鲨鱼是食鱼的，除了 Sphyrna zygaena 是食草的。除了食性广泛的 Galeocerdo cuvier 外，其他五种鲨鱼的摄食行为具有专门性。在 Carcharhinus obscurus 和 Sphyrna lewini 中观察到了个体发育的变化，较大的个体捕食软骨鱼。由于 Carcharhinus obscurus 和 Sphyrna lewini、Carcharhinus obscurus 和 Carcharhinus limbatus 以及 Rhizoprionodon lalandii 和 Carcharhinus limbatus 之间存在饮食重叠，因此需要对这些物种的时空分布进行进一步研究，以了解竞争相互作用的程度。
