Defining individual quality over lifetimes and selective contexts

Lailvaux, Simon P.; Kasumovic, Michael M.

doi:10.1098/rspb.2010.1591

Cited by 66 publications

(58 citation statements)

References 85 publications

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“…[21,23]), it may also result in decrease in fitness in other selective contexts (but see [66]). The fitness costs to expressing a poor bite force in terms of total selection (see [67,68] for discussion) might therefore outweigh the energetic costs of bite force development. Since our results show that bite force does not appear to be 'protected' from resource allocation in this way, a more likely possibility is that honesty may be maintained in nature via receiver-dependent costs if deceptive signallers are exposed through escalated combat with 'honest' individuals (cf.…”

Section: Discussionmentioning

confidence: 99%

A performance-based cost to honest signalling in male green anole lizards (Anolis carolinensis)

2012

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Sexual signals are considered costly to produce and maintain under the handicap paradigm, and the reliability of signals is in turn thought to be maintained by these costs. Although previous studies have investigated the costly nature of signal production, few have considered whether honesty might be maintained not by the costliness of the signal itself, but by the costs involved in producing the signalled trait. If such a trait is itself costly to produce, then the burden of energetic investment may fall disproportionately on that trait, in addition to any costs of signal maintenance that may also be operating. Under limited resource conditions, these costs may therefore be great enough to disrupt an otherwise reliable signal-to-trait relationship. We present experimental evidence showing that dietary restriction decouples the otherwise honest relationship between a signal (dewlap size) and a whole-organism performance trait (bite force) in young adult male Anolis carolinensis lizards. Specifically, while investment in dewlap size is sustained under low-resource condition relative to the high-resource treatment, investment in bite force is substantially lower. Disruption of the otherwise honest dewlap size to bite force relationship is therefore driven by costs associated with the expression of performance rather than the costs of signal production in A. carolinensis .

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Section: Discussionmentioning

confidence: 99%

A performance-based cost to honest signalling in male green anole lizards (Anolis carolinensis)

2012

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“…bite force and head size; Cameron et al, 2013). In fact, many studies have found that certain individuals outperform others in all tasks, a phenomenon that has invoked a recent surge in research on the concept of 'individual quality' (Van Damme et al, 2002;Wilson and Nussey, 2010;Lailvaux and Kasumovic, 2011;Wilson et al, 2014). However, few studies have been carried out examining similar performance traits in mammals and no study to our knowledge has examined the relationship between resource holding potential (e.g.…”

Section: Introductionmentioning

confidence: 99%

A disparity between locomotor economy and territory holding ability in male house mice

Morris

Ruff

Potts

et al. 2017

Journal of Experimental Biology

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Both economical locomotion and physical fighting are important performance traits to many species because of their direct influence on components of Darwinian fitness. Locomotion represents a substantial portion of the total daily energy budget of many animals. Fighting performance often determines individual reproductive fitness through the means of resource control, social dominance and access to mates. However, phenotypic traits that improve either locomotor economy or fighting ability may diminish performance in the other. Here, we tested for a predicted disparity between locomotor economy and competitive ability in wild-derived house mice (Mus musculus). We used 8 week social competition trials in semi-natural enclosures to directly measure male competitive ability through territorial control and female occupancy within territories. We also measured oxygen consumption during locomotion for each mouse using running trials in an enclosed treadmill and open-flow respirometry. Our results show that territory-holding males have higher absolute and mass-specific oxygen consumption when running (i.e. reduced locomotor economy) compared with males that do not control territories. This relationship was present both before and after 8 week competition trials in seminatural enclosures. This disparity between physical competitive ability and economical locomotion may impose viability costs on males in species for which competition over mates is common and may constrain the evolution of behavioral and phenotypic diversity, particularly in natural settings with environmental and resource variability.

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“…Total fitness is most clearly defined as the number of descendants produced by an individual relative to the average produced by other individuals in a population (Hunt et al 2004), and is affected by overall selection summed over several selective contexts (Hunt et al 2009;Lailvaux and Kasumovic 2011). As such, understanding the effects of a selective factor such as a pathogen on a given trait or traits in each of these broad contexts (e.g., natural selection versus sexual selection) is necessary if we are to understand how that factor ultimately affects total fitness.…”

Section: Introductionmentioning

confidence: 99%

Fitness Consequences of Infection by Batrachochytrium dendrobatidis in Northern Leopard Frogs (Lithobates pipiens)

et al. 2013

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The amphibian chytrid fungus, Batrachochytrium dendrobatidis (Bd), has been linked to amphibian declines and extinctions worldwide. The pathogen has been found on amphibians throughout eastern North America, but has not been associated with mass die-offs in this region. In this study, we conducted laboratory experiments on the effects of Bd infection in a putative carrier species, Lithobates pipiens, using two estimators of fitness: jumping performance and testes morphology. Over the 8-week study period, peak acceleration during jumping was not significantly different between infected and uninfected animals. Peak velocity, however, was significantly lower for infected animals after 8 weeks. Two measures of sperm production, germinal epithelium depth, and maximum spermatic cyst diameter, showed no difference between infected and uninfected animals. The width, but not length, of testes of infected animals was significantly greater than in uninfected animals. This study is the first to show effects on whole-organism performance of Bd infection in post-metamorphic amphibians, and may have important long-term, evolutionary implications for amphibian populations co-existing with Bd infection.

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Defining individual quality over lifetimes and selective contexts

Cited by 66 publications

References 85 publications

A performance-based cost to honest signalling in male green anole lizards (Anolis carolinensis)

A performance-based cost to honest signalling in male green anole lizards (Anolis carolinensis)

A disparity between locomotor economy and territory holding ability in male house mice

Fitness Consequences of Infection by Batrachochytrium dendrobatidis in Northern Leopard Frogs (Lithobates pipiens)

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