When offered prey of 2 sizes, larvae of E. cyathigerum exhibited typical Type-11 functional-response curves. When offered equal proportions of the two prey types, larvae preferred the larger type, regardless of hunger level. When offered different relative proportions of the two prey types, larvae markedly preferred the large type, except when the latter were least numerous. We interpret our findings in the light of classical optimal diet theory.


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Societas Internationalis Odonatologica

S.H. Chowdhury, Philip S. Corbet, & I.F. Harvey. (1989). Feeding and prey selection by larvae of Enallagma cyathigerum (Charpentier) in relation to size and density of prey (Zygoptera: Coenagrionidae). Odonatologica, 18(1), 1–11.