Reproduction under predation risk and the trade-off between current and future reproduction in the threespine stickleback

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http://hdl.handle.net/1975/152

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Proceedings of the Royal Society of London Series B 265 (1402) 1171-1175

Title: Reproduction under predation risk and the trade-off between current and future reproduction in the threespine stickleback
Author: Candolin, Ulrika
Publisher: Royal Society of London
Date: 1998
Language: en
Number of pages: 182401 bytes
ISSN: 0962-8452
URI: http://hdl.handle.net/1975/152
Abstract: An increasing number of studies show that animals adjust their reproductive e¡ort to the risk of predation. However, to maximize lifetime reproductive success this adjustment should depend on the animals' current and future reproductive potential. Here I tested this hypothesis by allowing threespine stickleback males (Gasterosteus aculeatus), differing in current and future mating probabilities, to reproduce in pools in both the presence and absence of predators. As expected, males adjusted their reproductive effort to the risk of predation. Fewer males bred, and all males developed less nuptial coloration in the presence of predators. However, males with a low current mating probability took less risk than males with a higher mating probability, whereas all males increased risk taking when future reproductive opportunities decreased. The results thus support the hypothesis that males are able to assess both the risk of predation and their current versus future mating probability, and adjust their reproductive decisions accordingly. The study further suggests that predation risk may have less effect on sexual selection than previously assumed, as the males which refrained from reproducing in the presence of predators were mainly males with a low mating probability.
Subject: reproduction
predation risk
mating probability
nuptial coloration
threespine stickleback


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