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Digestion of Spruce Budworm Larvae and Pupae in the Olive-backed Thrush, Hylochichla ustulata swainsoni (Tschudi)

Published online by Cambridge University Press:  31 May 2012

L. J. Mook  and
H. G. W. Marshall
L. J. Mook
Affiliation:
Department of Forestry of Canada, Regional Laboratory, Fredericton, New Brunswick
H. G. W. Marshall
Affiliation:
Department of Forestry of Canada, Regional Laboratory, Fredericton, New Brunswick
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Abstract

To use gizzard analysis quantitatively, in the assessment of bird predation on insect populations, information is needed on the time that identifiable remains of the prey can be found in the gizzard and on the rate at which these remains disappear. The digestion rate, measured by the disappearance of mandibles or cremasters, has been studied for larvae and pupae of the spruce budworm, Choristoneura fumiferana (Clem.), when eaten by the olive-backed thrush, Hylocichla ustulata swainsoni (Tschudi).

Type
Articles
Information
The Canadian Entomologist , Volume 97 , Issue 11 , November 1965 , pp. 1144 - 1149
Copyright
Copyright © Entomological Society of Canada 1965

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