Selection on insect immunity in the wild.
The strength of selection on immune function in wild populations has only been examined in a few vertebrate species. We report the results from a study measuring selection on a key insect immune enzyme, phenoloxidase (PO), in a wild population of the damselfly Calopteryx xanthostoma. We followed individually marked males from the pre-reproductive adult phase and recorded their lifetime mating success. We found positive selection on PO activity in response to an immune insult, but no selection on wing-spot quality, a trait actively displayed to females during courtship. We suggest that positive selection on PO activity in the year of study may be explained by annual fluctuations in parasite loads.
Department of Animal and Plant Sciences, University of Sheffield, Sheffield S10 2TN, UK. jor@sheffield.ac.uk
Jens
J
Rolff
Michael T
MT
Siva-Jothy
D000818:Animals; D005602:France; D007313:Insecta / Q000276:immunology* / Q000378:metabolism / Q000502:physiology; D008297:Male; D014442:Monophenol Monooxygenase / Q000276:immunology / Q000378:metabolism*; D019370:Observation; D010858:Pigmentation / Q000502:physiology; D012098:Reproduction / Q000502:physiology; D045483:Rivers; D012641:Selection, Genetic; D014921:Wings, Animal / Q000502:physiology
D014442:Monophenol Monooxygenase