Conserved and convergent mechanisms underlying performance-life-history trade-offs

被引:16
作者
Husak, Jerry F. [1 ]
Lailvaux, Simon P. [2 ]
机构
[1] Univ St Thomas, Dept Biol, St Paul, MN 55105 USA
[2] Univ New Orleans, Dept Biol Sci, New Orleans, LA 70148 USA
关键词
Life history; Mitochondria; Muscle; Performance; Reactive oxygen species; Trade-offs; HYPOXIA-INDUCIBLE FACTOR; JUVENILE-HORMONE; OXIDATIVE STRESS; SKELETAL-MUSCLE; MITOCHONDRIAL BIOGENESIS; LOCOMOTOR PERFORMANCE; ADIPOKINETIC HORMONE; SEXUAL SELECTION; IMMUNE-SYSTEM; THYROID-HORMONE;
D O I
10.1242/jeb.243351
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
Phenotypic trade-offs are inevitable in nature, but the mechanisms driving them are poorly understood. Movement and oxygen are essential to all animals, and as such, the common ancestor to all living animals passed on mechanisms to acquire oxygen and contract muscle, sometimes at the expense of other activities or expression of traits. Nevertheless, convergent pathways have also evolved to deal with critical trade-offs that are necessary to survive ubiquitous environmental challenges. We discuss how whole-animal performance traits, such as locomotion, are important to fitness, yet costly, resulting in trade-offs with other aspects of the phenotype via specific conserved and convergent mechanistic pathways across all animals. Specifically, we discuss conserved pathways involved in muscle structure and signaling, insulin/insulin-like signaling, sirtuins, mitochondria and hypoxia-inducible factors, as well as convergent pathways involved in energy regulation, development, reproductive investment and energy storage. The details of these mechanisms are only known from a few model systems, and more comparative studies are needed. We make two main recommendations as a framework for future studies of animal form and function. First, studies of performance should consider the broader life-history context of the organism, and vice versa, as performance expression can require a large portion of acquired resources. Second, studies of life histories or mechanistic pathways that measure performance should do so in meaningful and standardized ways. Understanding proximate mechanisms of phenotypic trade-offs will not only better explain the phenotypes of the organisms we study, but also allow predictions about phenotypic variation at the evolutionary scale.
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页数:12
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