Genetic Covariation Among Life-History Components: The Effect of Novel Environments

Service, Philip M.; Rose, Michael R.

doi:10.2307/2408694

Cited by 161 publications

(104 citation statements)

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“…However, a true trade-off between life-history traits can also produce the same result that senescence traits correlate with early-life traits along the life-history continuum. The correlation that we report can then be interpreted as the result of the species-specific trade-off between the early-life benefits and late deleterious effects of some genes (Williams 1957;Service & Rose 1985). In short, a first mechanism related to the mutation accumulation theory predicts that the observed correlation between the age at the onset of senescence and early-life performance is a consequence of the speed of life, which itself is driven by the rate of baseline mortality, while a second mechanism related to the antagonistic pleiotropy theory predicts that the observed correlation stems from a true trade-off between early-and late-life performance.…”

Section: Resultsmentioning

confidence: 74%

Age at the onset of senescence in birds and mammals is predicted by early-life performance

et al. 2010

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Life-history theory predicts that traits involved in maturity, reproduction and survival correlate along a fast-slow continuum of life histories. Evolutionary theories and empirical results indicate that senescence-related traits vary along this continuum, with slow species senescing later and at a slower pace than fast species. Because senescence patterns are typically difficult to estimate from studies in the wild, here we propose to predict the associated trait values in the frame of life-history theory. From a comparative analysis based on 81 free-ranging populations of 72 species of birds and mammals, we find that a nonlinear combination of fecundity, age at first reproduction and survival over the immature stage can account for ca two-thirds of the variance in the age at the onset of actuarial senescence. Our life-history model performs better than a model predicting the onset based on generation time, and it only includes life-history traits during early life as explanatory variables, i.e. parameters that are both theoretically expected to shape senescence and are measurable within relatively short studies. We discuss the goodfit of our life-history model to the available data in the light of current evolutionary theories of senescence. We further use it to evaluate whether studies that provided no evidence for senescence lasted long enough to include the onset of senescence.

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Section: Resultsmentioning

confidence: 74%

Age at the onset of senescence in birds and mammals is predicted by early-life performance

et al. 2010

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“…In most situations, negative correlations emerge, because a female cannot simultaneously optimize all life-history traits. However, null or positive correlations are also found, suggesting that constraints on life-history traits can potentially be released [3,4].…”

Section: Introductionmentioning

confidence: 99%

Warmer temperatures attenuate the classic offspring number and reproductive investment trade-off in the common lizard, Zootoca vivipara

et al. 2016

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Life-history traits involved in trade-offs are known to vary with environmental conditions. Here, we evaluate the response of the trade-off between 'offspring number' versus 'energy invested per offspring' to ambient temperature in 11 natural populations of the common lizard, Zootoca vivipara. We provide evidence at both the intra-and interpopulation levels that the trade-off is reduced with an increase in air temperature. If this effect enhances current individual fitness, it may lead to an accelerated pace of life in warmer environments and could ultimately increase adult mortality. In the context of global warming, our results advocate the need for more studies in natural populations to explore interactions between life-history traits' trade-offs and environmental conditions.

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“…It is expected that genetic variation will increase in plant populations challenged with novel environmental stressors (Service and Rose, 1985;Holloway et al, 1990).…”

Section: Discussionmentioning

confidence: 99%

Reassessment of Molecular Variation in Isolated Populations of <i>Deschampsia cespitosa</i> from Metal Contaminated Regions in Northern Ontario (Canada) after 17 Years of Potential Genetic Recombination

Rainville¹,

Beckett²,

Nkongolo³

2017

American Journal of Environmental Sciences

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Abstract:The effects of ore extraction and processing procedures in the Greater Sudbury and Cobalt regions have been long-lasting. The objective of this study is to determine the current level of genetic variation in Deschampsia cespitosa populations from metal contaminated and uncontaminated sites in samples collected in Northern Ontario in 2016 after 17 years of potential genetic recombination since the last study in 1999. D. cespitosa leaf samples collected from the City of Greater Sudbury (CGS), Cobalt and Little Current were analyzed using ISSR primers. The levels of genetic variation were moderate to high within targeted populations. There was no significant difference (p≤0.05) in the overall percent of polymorphic loci in metal-uncontaminated site of Little Current (from 70% in 1999 to 77% in 2016) and in a Cobalt Cart Lake site (from 48% in 1999 to 55% in 2016). But a significant decrease in genetic variation was observed in CGS Wahnapitae site (from 72% in 1999 to 54% in 2016). On the other hand, a significant increase was observed in Cobalt Nipissing (from 46% in 1999 to 64% in 2016). The Kelly Lake site in the CGS with the lowest level of polymorphic loci (42.5%) in 2016 was not surveyed in 1999. The degree of genetic relatedness among sites has increased since the populations are more genetically closely related than 17 years ago. No population-specific ISSR marker was identified. The clustering of Cobalt and Sudbury populations strengthens the earlier theory that Sudbury populations of D. cespitosa might be from the Cobalt region.

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Genetic Covariation Among Life-History Components: The Effect of Novel Environments

Cited by 161 publications

References 0 publications

Age at the onset of senescence in birds and mammals is predicted by early-life performance

Age at the onset of senescence in birds and mammals is predicted by early-life performance

Warmer temperatures attenuate the classic offspring number and reproductive investment trade-off in the common lizard, Zootoca vivipara

Reassessment of Molecular Variation in Isolated Populations of <i>Deschampsia cespitosa</i> from Metal Contaminated Regions in Northern Ontario (Canada) after 17 Years of Potential Genetic Recombination

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