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Related Experiment Video

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Foraging Path-length Protocol for Drosophila melanogaster Larvae

Foraging Path-length Protocol for Drosophila melanogaster Larvae

Published on: April 23, 2016

Size-mediated adaptive foraging: a host-selection strategy for insect parasitoids.

Lee Mason Henry¹, Brian O Ma, Bernard D Roitberg

¹Department of Biological Sciences, Simon Fraser University, Burnaby, British Columbia, Canada. lhenry@sfu.ca

|June 9, 2009

Summary

Parasitoid body size influences host selection. Optimal foraging benefits smaller parasitoids most by allowing them to focus on smaller, less defended hosts when available.

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Area of Science:

Ecology
Behavioral Ecology
Evolutionary Biology

Background:

Foraging models often assume uniform consumer and prey traits, neglecting individual variation.
Hymenopteran parasitoids offer a model system to study body size effects on host selection due to size variation and host defenses.

Purpose of the Study:

To investigate how parasitoid body size influences the range of acceptable host instars using an experimentally parameterized host selection model.
To compare the efficiency of optimal versus indiscriminate host selection strategies across different parasitoid body sizes.

Main Methods:

Applied an experimentally parameterized host selection model.
Utilized a demographic model to compare optimal and indiscriminate host selection strategies.
Assessed net fitness accrual and impact on aphid recruitment in stage-structured populations.

Main Results:

Larger parasitoids benefit from optimal host selection by utilizing a broader range of hosts.
Smaller parasitoids gain the most from optimal selection, focusing on smaller, less defended hosts when abundant.
Flexible host selection behavior correlates with adult body size in hymenopteran parasitoids.

Conclusions:

Body size is a key factor in shaping host selection strategies in hymenopteran parasitoids.
Optimal host selection provides significant fitness advantages, particularly for smaller individuals.
Behavioral interactions within a generation can influence population dynamics across generations.