Mating rock shrimp hedge their bets: old males take greater risk, but only after careful assessment of the investment scenario

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• 作者：Nicolas Christian Ory ; Thijs Christiaan van Son…
• 关键词：Age ; Mate ; guarding ; Mating behavior ; Predation risk ; Residual reproductive value ; Risk ; taking strategies
• 刊名：Behavioral Ecology and Sociobiology
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：69
• 期：12
• 页码：1975-1984
• 全文大小：488 KB
• 参考文献：Andersson MB (1994) Sexual selection. Princeton University Press, Princeton
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• 作者单位：Nicolas Christian Ory (1) (2)
  Thijs Christiaan van Son (1) (3)
  Martin Thiel (1) (2) (4)
  
  1. Facultad Ciencias del Mar, Universidad Católica del Norte, Larrondo 1281, Coquimbo, Chile
  2. Millennium Nucleus Ecology and Sustainable Management of Oceanic Island (ESMOI), Coquimbo, Chile
  3. Marine Geology, Geological Survey of Norway, Postboks 6315 Sluppen, 7491, Trondheim, Norway
  4. Centro de Estudios Avanzados en Zonas áridas (CEAZA), Coquimbo, Chile
  
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Behavioural Sciences
  Zoology
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-0762

文摘

Mature organisms often have to trade reproductive opportunities against the need to survive, especially in species with exaggerated, sexually selected traits. Life history theory predicts that old males with low residual reproductive value (RRV) would accept greater risk for current reproduction than their younger counterparts. Accordingly, we tested the prediction that, under predation risk, old males of the rock shrimp Rhynchocinetes typus pair with females faster and for a longer time than young males do. We exposed young and old dominant males (in the final ontogenetic stage, called “robustus- to a female in the absence and presence of a predator. As predicted, older robustus males modified their mating behavior when exposed to a predator. However, in contrast to the prediction, they delayed female seizure under predation risk, possibly to carefully assess the actual threat before initiating female guarding. Once they had established the mate-guarding position, old robustus males did not interrupt it until the end of female spawning and, in the presence of predators, even guarded the female significantly longer than in predator-free treatments. In contrast, younger robustus males did not delay female seizure but abandoned the female repeatedly when a predator was present, suggesting that they perceived and responded to the predation risk. Our results suggest that older robustus males have the experience to assess threats before engaging in risky behaviors that bolster their reproductive success. Although consistent with the theory that low RRV individuals should accept greater reproductive risk, we suggest that old individuals do not recklessly engage in risky behaviors but rather cautiously evaluate the threats before investing in a potentially terminal reproductive event. Keywords Age Mate-guarding Mating behavior Predation risk Residual reproductive value Risk-taking strategies