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3 results for “Cotesia glomerata”
Effects of oviposition in a non-host species on foraging behaviour of the parasitoid Cotesia glomerata
<p><span>Parasitoids lay their eggs in or on a host, usually another insect. During foraging, parasitoids can encounter insects that differ in terms of host suitability and quality. At one extreme end of this spectrum are non-hosts that are unsuitable for offspring development.</span></p> <p><span>Non-hosts are generally ignored but parasitization does occur and occasionally also results in egg deposition. Here, we investigate how oviposition in a non-host influences subsequent foraging behaviour of a parasitoid and whether this is mediated by learning. Our study system consists of the endoparasitoid <em>Cotesia glomerata</em> and the presumed non-host caterpillar <em>Mamestra brassicae</em>.</span></p> <p><span>In the presence of Pieris brassicae hosts and/or their traces (frass), we observed that <em>C. glomerata</em> inserts its ovipositor into <em>M. brassicae</em> caterpillars. Eggs were deposited, but all eggs disappeared within 96h, confirming the non-host status of <em>M. brassicae</em>. In contrast to our expectation, there was no memory retention after oviposition in a non-host and parasitoids did not alter their behaviour with respect to non-host contacts and ovipositions. Instead, <em>C. glomerata</em> became more motivated to forage on a non-host infested leaf.</span></p> <p><span>We propose that egg deposition in non-hosts by <em>C. glomerata</em> might be due to their high egg load, which is thought to make parasitoids less selective on host quality, especially when they have few reproductive opportunities. In such cases, fitness costs to individual females are low. Egg deposition in non-hosts might ultimately lead to host range expansion if parasitoids overcome the defence response of non-hosts over evolutionary time.</span></p>
Effects of oviposition in a non-host species on foraging behaviour of the parasitoid Cotesia glomerata
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Data from: Spatial and temporal diversity in hyperparasitoid communities of Cotesia glomerata on garlic mustard, Alliaria petiolata
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