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n2:266317

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bibo:Document schema:CreativeWork

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Couteyen (2006)

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2006-01-01

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Couteyen (2006)

dct:abstract

The effect of predation by rainbow trout (Oncorhynchus mykiss Walbaum, 1792) on the larval populations of two damselflies species of the island, Coenagriocnemis reuniensis (Fraser, 1957) and Enallagma glaucum (Burmeister, 1839) has been studied. Faced with the predator, the two species react differently : a local extinction of C. reuniensis has been observed as the larval density has shifted from over 4 larvae per square metre to 0, while no significant impact of the predator on the E. glaucum has been recorded. The fact that 7 larvae of C. reuniensis were discovered in the analysis of 30 trout stomachs' contents whereas no larva of E. glaucum was found, confirms the greater susceptibility of C. reuniensis to the predation. These two types of response can be explained by the different larval ways of life. The larvae of C. reuniensis, an endemic species, are epibenthic and usually colonise vegetationless habitats. On the contrary, the larvae of E. glaucum, which can also be found in Africa, hide in underwater grass-banks. This makes them difficult to reach for a predator moving in free water.

bibo:abstract

The effect of predation by rainbow trout (Oncorhynchus mykiss Walbaum, 1792) on the larval populations of two damselflies species of the island, Coenagriocnemis reuniensis (Fraser, 1957) and Enallagma glaucum (Burmeister, 1839) has been studied. Faced with the predator, the two species react differently : a local extinction of C. reuniensis has been observed as the larval density has shifted from over 4 larvae per square metre to 0, while no significant impact of the predator on the E. glaucum has been recorded. The fact that 7 larvae of C. reuniensis were discovered in the analysis of 30 trout stomachs' contents whereas no larva of E. glaucum was found, confirms the greater susceptibility of C. reuniensis to the predation. These two types of response can be explained by the different larval ways of life. The larvae of C. reuniensis, an endemic species, are epibenthic and usually colonise vegetationless habitats. On the contrary, the larvae of E. glaucum, which can also be found in Africa, hide in underwater grass-banks. This makes them difficult to reach for a predator moving in free water.

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2006-01-01

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Couteyen, S. 2006. Effets de l'introduction de la truite arc-en-ciel (Oncorhynchus mykiss Walbaum, 1792) sur les populations larvaires de deux espèces de Zygoptères de l'Ile de la Réunion. <em>Martinia</em>, 22(2): 55-63.