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Performance trade-offs in wild mice.

Ilias Berberi1, Vincent Careau2

  • 1Department of Biology, University of Ottawa, 30 Marie Curie, Ottawa, ON, K1N 6N5, Canada.

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Summary
This summary is machine-generated.

Animal performance trade-offs, like between strength and speed, are key for survival. This study found a negative correlation between grip strength and sprint speed in individual mice, highlighting crucial differences in how performance is measured.

Keywords:
ClimbingClingingIndividual qualityRunningStrength

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Area of Science:

  • Ecology and Evolutionary Biology
  • Animal Physiology
  • Behavioral Ecology

Background:

  • Performance traits (speed, strength, endurance) are vital for animal survival and reproduction.
  • Morphological adaptations for one performance trait can negatively impact another, creating trade-offs.
  • Performance trade-offs are well-documented between species, but evidence within individuals is less clear.

Purpose of the Study:

  • To investigate the presence and nature of performance trade-offs at the individual level in a wild population.
  • To determine if grip strength and sprint speed are negatively correlated within individual white-footed mice (Peromyscus leucopus).
  • To differentiate between among-individual and within-individual correlations in performance traits.

Main Methods:

  • Repeatedly captured and measured grip strength and sprint speed in 189 wild white-footed mice.
  • Analyzed performance data using maximum scores per individual across repeated trials.
  • Employed a bivariate mixed model to partition correlations into among- and within-individual components.

Main Results:

  • A significant negative correlation between grip strength and sprint speed was found at the among-individual level.
  • The phenotypic correlation appeared positive and significant due to aggregation bias.
  • The within-individual correlation was positive but not statistically significant.

Conclusions:

  • This study provides evidence for a performance trade-off between strength and speed at the among-individual level in a wild mammal.
  • Proper statistical partitioning is essential to detect true individual-level trade-offs, as phenotypic correlations can be misleading.
  • Observed trade-offs may stem from underlying differences in muscle physiology or morphology, influenced by genetics or environmental plasticity.