A comparison of color-, shape- and pattern-learning by the hymenopteran parasitoid Microplitis croceipes |
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Authors: | F L Wäckers W J Lewis |
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Institution: | (1) Department of Entomology, Wageningen Agricultural University, PO Box 8031, 6700 EH Wageningen, The Netherlands, NL;(2) Insect Biology and Population Management Research Laboratory, Agricultural Research Service, USDA. P.O. Box 748, Tifton, GA 31793, USA, US |
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Abstract: | Visual learning by the larval parasitoid, Microplitis croceipes Cresson (Hymenoptera: Braconidae) was investigated in flight chamber studies. During conditioning, free-ranging parasitoids
were given a choice between two visual alternatives, only one of which offered a host larva. By using alternatives that differed
in either color, shape or pattern, parasitoids could be conditioned to distinguish host sites on the basis of each of these
visual cues. Tests during which no reward was offered were conducted following six rewards (ovipositions) at one of the two
alternative stimuli. The test results reveal that M. croceipes learned to distinguish between shapes more readily than between colors or patterns. This high rate of shape learning in this
parasitoid is in strong contrast to the learning capacity of honey bees, which have been shown to learn color better than
pattern and pattern better than shapes. It is argued that the difference in learning capacities between M. croceipes and the honey bee may reflect the different selection pressures imposed on these two species by their natural ecological
needs. The high rate of shape learning in M. croceipes may be adaptive in dealing with the homochromatic but multishaped environment in which parasitoids have to locate their herbivorous
hosts.
Accepted: 30 January 1999 |
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Keywords: | Visual discrimination Hymenopteran parasitoid Host finding Learning predisposition |
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