Longevity,calling effort,and metabolic rate in two populations of cricket |
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Authors: | Kensuke Okada William R Pitchers Manmohan D Sharma John Hunt David J Hosken |
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Institution: | (1) Centre for Ecology and Conservation, University of Exeter, Cornwall Campus, Tremough, Penryn, TR10 9EZ, UK; |
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Abstract: | Intraspecific variation in a resting metabolic rate (RMR) is likely to be an important determinant of energetic-resource use
and may influence the resources subsequently available for allocation to traits not directly associated with somatic maintenance.
The influence of RMR on resource availability could be especially important for condition-dependent sexual traits, such as
cricket calls, that are themselves energetically costly to produce. RMR may also be associated with longevity, either negatively
because individuals with a high RMR burn resources faster and die young, or positively as individuals with high RMR are more
able to accrue resources to fuel survival. Additionally, the associations between RMR and other characters may vary across
populations if differential selection or drift shapes these traits. Here we tested for differences in RMR, body mass, calling
effort, and longevity in two populations of cricket Gryllodes sigillatus and then evaluated the potential influence of RMR on calling and longevity. We find that RMR, calling effort, and longevity
varied across populations, but mass did not. Controlling for population and mass, RMR was not significantly associated with
calling effort, but was negatively associated with longevity. These findings suggest that male crickets that live fast die
young. |
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