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Evolutionary change in parasitoid resistance under crowded conditions in Drosophila melanogaster

Evolutionary change in parasitoid resistance under crowded conditions in Drosophila melanogaster
Evolutionary change in parasitoid resistance under crowded conditions in Drosophila melanogaster
Patterns of investment of limiting resources in such processes as competing for food and defense against natural enemies are shaped by trade-offs and constraints. In Drosophila melanogaster artificial selection for increased resistance to parasitoids results in a correlated decrease in larval competitive ability. Here we ask whether selection for competitive ability leads to a correlated reduction in parasitoid resistance. Replicated lines of D. melanogaster were maintained under crowded or uncrowded conditions for eight generations. As expected, the crowded lines evolved higher competitive ability (when tested against a common strain of fly).
But instead of parasitoid resistance decreasing, we found a significant increase, and that this was associated with elevated densities of haemocytes in second-instarlarvae. To understand these results we measured a variety of life-history traits in the two sets of lines. We find evidence that directly and indirectly selected changes in competitive ability are due to different mechanisms. We also ask why crowded conditions should select for increased resistance to parasitism, and conclude that it is unlikely to be due to correlated selection for resistance to other natural enemies, but might be due to correlated selection for better wound responses.
crowding, drosophila melanogaster, experimental evolution, haemocytes, immunity, parasitoid, tradeoff symmetry
0014-3820
1292-1299
Sanders, Amy E.
bd88244a-79cd-44f1-bc32-b1f145ac6712
Scarborough, Claire
230f514b-1176-4fc7-b487-5d380478401c
Layen, Sophie L.
b51bede2-a209-4e35-b8c8-e6263dd1fec3
Kraaijeveld, Alex R.
4af1791a-15cf-48b9-9fd8-b3a7fb450409
Godfray, H. Charles J.
69326e74-4061-42de-9cf4-540ed7563a01
Sanders, Amy E.
bd88244a-79cd-44f1-bc32-b1f145ac6712
Scarborough, Claire
230f514b-1176-4fc7-b487-5d380478401c
Layen, Sophie L.
b51bede2-a209-4e35-b8c8-e6263dd1fec3
Kraaijeveld, Alex R.
4af1791a-15cf-48b9-9fd8-b3a7fb450409
Godfray, H. Charles J.
69326e74-4061-42de-9cf4-540ed7563a01

Sanders, Amy E., Scarborough, Claire, Layen, Sophie L., Kraaijeveld, Alex R. and Godfray, H. Charles J. (2005) Evolutionary change in parasitoid resistance under crowded conditions in Drosophila melanogaster. Evolution, 59 (6), 1292-1299. (doi:10.1111/j.0014-3820.2005.tb01779.x).

Record type: Article

Abstract

Patterns of investment of limiting resources in such processes as competing for food and defense against natural enemies are shaped by trade-offs and constraints. In Drosophila melanogaster artificial selection for increased resistance to parasitoids results in a correlated decrease in larval competitive ability. Here we ask whether selection for competitive ability leads to a correlated reduction in parasitoid resistance. Replicated lines of D. melanogaster were maintained under crowded or uncrowded conditions for eight generations. As expected, the crowded lines evolved higher competitive ability (when tested against a common strain of fly).
But instead of parasitoid resistance decreasing, we found a significant increase, and that this was associated with elevated densities of haemocytes in second-instarlarvae. To understand these results we measured a variety of life-history traits in the two sets of lines. We find evidence that directly and indirectly selected changes in competitive ability are due to different mechanisms. We also ask why crowded conditions should select for increased resistance to parasitism, and conclude that it is unlikely to be due to correlated selection for resistance to other natural enemies, but might be due to correlated selection for better wound responses.

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More information

Published date: 2005
Additional Information: My contributions consisted of generating the ideas, supervising the performance of the experiments, being involved in the analyses and taking the lead in writing the paper
Keywords: crowding, drosophila melanogaster, experimental evolution, haemocytes, immunity, parasitoid, tradeoff symmetry

Identifiers

Local EPrints ID: 35410
URI: https://eprints.soton.ac.uk/id/eprint/35410
ISSN: 0014-3820
PURE UUID: 0ac3376a-8800-4e32-9343-2ef72ef8111b
ORCID for Alex R. Kraaijeveld: ORCID iD orcid.org/0000-0002-8543-2640

Catalogue record

Date deposited: 16 May 2006
Last modified: 06 Jun 2018 12:41

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Contributors

Author: Amy E. Sanders
Author: Claire Scarborough
Author: Sophie L. Layen
Author: H. Charles J. Godfray

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