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Sélection de proies de tailles différentes en fonction de leur abondance absolue et relative par les larves d'Anax imperator

Abstract : Two groups of larvae ( r + F-l, F-2 + F-3) were presented 2 different sizes of Daphnia magna at various densities. F + F-l larvae chose preferentially the bigger prey when overall prey densities were high, independently of relative densities. Larvae from the 2 other instars chose bigger prey even when density was low, but were more selective when prey densities were high than when they were low. This preferential choice was not exclusive: Anax larvae never completely ignored smaller prey. The analysis of selectivity at different phases of feeding behaviour shows that selection generally occurs prior to the orientation towards a prey item.
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https://hal-univ-rennes1.archives-ouvertes.fr/hal-01320585
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Submitted on : Tuesday, May 24, 2016 - 10:35:51 AM
Last modification on : Thursday, January 9, 2020 - 4:08:05 PM

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  • HAL Id : hal-01320585, version 1

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Catherine Blois-Heulin. Sélection de proies de tailles différentes en fonction de leur abondance absolue et relative par les larves d'Anax imperator. Odonatologica, International Odonatological Foundation, 1982, 11 (3), pp.211-218. ⟨hal-01320585⟩

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