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Behavioral Ecology Advance Access published online on June 1, 2009
Behavioral Ecology, doi:10.1093/beheco/arp044
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© The Author 2009. Published by Oxford University Press on behalf of the International Society for Behavioral Ecology. All rights reserved. For permissions, please e-mail: journals.permissions@oxfordjournals.org

Nutritional enrichment increases courtship intensity and improves mating success in male spiders

Johannes Peter Lomborg and Søren Toft

Department of Biological Sciences, Genetics and Ecology, Aarhus University, Building 1540, DK-8000 Århus C, Denmark

Address correspondence to S. Toft. E-mail: soeren.toft{at}biology.au.dk.


  Abstract

The development of male sexual ornaments and the intensity of male courtship behavior are often used by females as criteria for mate choice and by other males to evaluate the strength of a rival. We tested the hypotheses that courtship intensity and mating success depend on the males' nutritional status (enriched or deficient) and that courtship intensity predicts mating success in males of the same nutritional status. We used wolf spiders, Pardosa prativaga, which have an elaborate display of courtship behaviors, including encircling, palp vibrations, abdomen vibrations, hopping, etc. Viability parameters indicated enhanced condition of enriched males. Mating success was higher for nutrient-enriched males in direct competition with deficient males. Enriched males had higher courtship intensity and were also larger (carapace width) but not heavier than deficient males. The statistical analysis indicated that diet effects on courtship intensity were indirect, through its effect on size. In competition tests between males of equal mass and the same diet treatment, the previously most active male (high levels of palp vibrating, abdomen vibrating, and hopping) had the highest mating success, though this result depended on male nutrient status. The widely used residual condition index (RCI) did not distinguish the treatments. It is suggested that the index is unsuitable in a situation of nutritional stress caused by nutrient imbalance. The results underscore the importance of nutrient balancing to all aspects of performance also in predatory animals.

Key words: Araneae, condition dependence, courtship, Lycosidae, nutrient balance, nutrition, Pardosa prativaga, sexual selection, wolf spider.

Received 14 May 2008; revised 13 November 2008; accepted 4 February 2009.


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