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Efficiency of vibrational sounding in the parasitoid Pimpla turionellae is affected by female size

Otten, H. and Wäckers, F.L. and Battini, M. and Dorn, S. (2001) Efficiency of vibrational sounding in the parasitoid Pimpla turionellae is affected by female size. Animal Behaviour, 61, 671-677. ISSN 0003-3472.

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The pupal parasitoid Pimpla (=Coccygomimus) turionellae L. (Hymenoptera: Ichneumonidae) attacks a broad range of lepidopteran pupae. The variation in host size translates into substantial differences in size among adult parasitoids. Pimpla turionellae shows a strong host size-dependent sex allocation, which indicates that parasitoid body size influences sex- specific effects on fitness costs. We tested whether the body size of females affects their capacity to locate hosts by vibrational sounding. We investigated parasitoids from three size categories with respect to their ability to find artificial hosts (cigarette filters) in cylinders made of thin or thick paper (20 or 65 g/m(2), respectively). Using laser Doppler vibrometry, we measured vibration signals produced by large and medium-sized females during vibrational sounding. Large females produced vibrations of a higher intensity than, but a similar frequency to, their smaller conspecifics. The parasitoid's ability to locate a hidden host model by vibrational sounding also improved with size. This indicates that parasitoid size is an important factor in determining the female's host-searching success. We discuss the results in relation to the parasitoid's behavioural ecology. (C) 2001 The Association for the Study of Animal Behaviour. [KEYWORDS: Reliability-detectability problem; coccygomimus-turionellae; host location; hymenoptera; ichneumonidae; behavior; fitness; braconidae; leafminer; crickets]

Item Type:Article
Institutes:Nederlands Instituut voor Ecologie (NIOO)
ID Code:11046
Deposited On:24 Nov 2011 01:00
Last Modified:31 Mar 2014 10:49

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