Fitness benefits of multiple mating versus female mate choice in the cellar spider (Pholcus phalangioides) |
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Authors: | Gabriele Uhl Sandra Schmitt Martin A. Schäfer |
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Affiliation: | (1) Department of Neuroethology, Institute of Zoology, University of Bonn, Endenicher Allee 11-13, 53115 Bonn, Germany;(2) Institut für Tierzucht und Genetik, Veterinärmedizinische Universität Wien, University of Veterinary Medicine Vienna, Veterinärplatz 1, A-1210 Wien, Austria |
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Abstract: | Recent studies have demonstrated that mating with multiple males can be beneficial for females and her offspring even if males contribute nothing but sperm. This was mainly established for species in which sperm from several males mix in the reproductive tract of the female, thus allowing sperm competition and/or female sperm choice. However, in species with last male sperm precedence, female re-mating decides against the previous male by strongly limiting his reproductive success. We tested the effect of female re-mating behaviour using the cellar spider Pholcus phalangioides, which shows strong last males sperm precedence and moderate levels of polyandry under natural situations. We predicted that females prevented from remating even though they are receptive would show reduced reproductive success compared to females that accept two copulations and females that reject a second male, since the latter two treatments were allowed to behave according to their decisions. However, if the number of matings per se had an effect on oviposition or on offspring performance, double-mated females should perform better compared to both treatments of once-mated females. We measured female fecundity and fertility over a period of 140 days, comparable to the species' natural reproductive peak season. Two thousand one hundred and fifty-two offspring from 67 first egg sacs were reared under two feeding levels. We registered development time and survival, and measured offspring adult size and mass. We found a positive effect of double mating, as in this treatment, oviposition probability was higher compared to the other treatments. Interestingly, adult female offspring of the DM treatment that were raised under low food level had a higher condition index compared to those from FS and RM, but development time, size and mass at adulthood were not affected by mating treatment. Female choice only seemed to affect hatching latency of the offspring. Overall, the main predictor of female reproductive output and success was female body size. |
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Keywords: | Sexual selection Multiple mating Fertility Offspring phenotype Growth Survival Araneae |
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