Diet of Octopus vulgaris in False Bay, South Africa

C. D. Smith

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Diet of Octopus vulgaris in False Bay, South Africa

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The diet of Octopus vulgaris was analysed using instantaneous daytime observations, midden counts, and stomach contents and a total of 39 prey species were identified. From stomach contents, the most important prey species were Plagusia chabrus (64.6 IRI, index of relative importance) and Haliotis midae (21.6 IRI). Crustaceans were the most frequently found prey group in octopus stomachs (63.6 frequency of occurrence), followed by molluscs (37.6), teleosts (11.2), and polychaetes (10.8). Prey size and diversity increased with increasing octopus size. From middens, the mean shell lengths of H. midae consumed by small, medium, and large O. vulgaris were 53.3, 72.6, and 86.0 mm, respectively. Compared with stomach contents, midden counts were 3 times higher for shelled molluscs, but 5 times lower for crustaceans and soft-bodied organisms. Similarly, instantaneous daytime observations were 3 times higher for shelled molluscs, but 5 times lower for crustaceans and 2 times lower for soft-bodied organisms.

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《Marine Biology: International Journal on Life in Oceans and Coastal Waters》 |2003年第6期|1127-1133|共7页
作者
C. D. Smith;
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Marine and Coastal Management, Private Bag X2, 8012 Rogge Bay, Cape Town, South Africa;

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正文语种英语
中图分类环境生物学;
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Diet of Octopus vulgaris in False Bay, South Africa

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