Development of G: a test in an amphibious fish

Styga, Joseph M.; Houslay, Thomas M.; Wilson, Alastair J.; Earley, Ryan L.

doi:10.1038/s41437-018-0152-4

Cited by 7 publications

(8 citation statements)

References 98 publications

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“…Genetic variance for life history and fitness traits is often low (e.g., McFarlane et al 2014), and often 505 decreases with ontogeny (e.g., Aguirre et al 2014). In contrast, our results suggested increases in genetic 506 variance with development, which has been found previously in laboratory conditions (Styga et al 2018). 507…”

supporting

confidence: 54%

Local adaptation and hybrid failure share a common genetic basis

Walter

Aguirre

Wilkinson

et al. 2019

Preprint

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Testing whether local adaptation and intrinsic reproductive isolation share a genetic basis can reveal important connections between adaptation and speciation. Local adaptation arises as advantageous alleles spread through a population, but whether these same advantageous alleles fail on the genetic backgrounds of other populations remains largely unknown. We used a quantitative genetic breeding design to produce a late generation (F4) recombinant hybrid population by equally mating amongst four contrasting ecotypes of a native Australian daisy for four generations. We tracked fitness across generations and measured morphological traits in the glasshouse, and used a reciprocal transplant to quantify fitness in all four parental habitats. In the glasshouse, plants in the second generation showed a reduction in fitness as a loss of fertility, but this was fully recovered in the following generation. The F4 hybrid lacked extreme phenotypes present in the parental ecotypes, suggesting that genes reducing hybrid fitness were linked to traits specific to each ecotype. In the natural habitats, additive genetic variance for fitness was greatest for habitats that showed stronger native-ecotype advantage, suggesting that a loss of genetic variation present in the parental ecotypes were adaptive in the natural habitats. Reductions in genetic variance for fitness were associated with a loss of ecological trade-offs previously described in the parental ecotypes. Furthermore, natural selection on morphological traits differed amongst the parental habitats, but was not predicted to occur towards the morphology of the parental ecotypes. Together, these results suggest that intrinsic reproductive isolation removed adaptive genetic variation present in the parental ecotypes. The evolution of these distinct ecotypes was likely governed by genetic variation that resulted in both ecological trade-offs and intrinsic reproductive isolation among populations adapted to contrasting environments.

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supporting

confidence: 54%

Local adaptation and hybrid failure share a common genetic basis

Walter

Aguirre

Wilkinson

et al. 2019

Preprint

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“…2018; Styga et al. 2019). To calculate phenotypic correlations, we extracted fitted means for each variable and calculated Pearson's correlation coefficients using the car package, with sequential Bonferroni corrections to account for compounding Type I error.…”

Section: Methodsmentioning

confidence: 99%

Distinct cold tolerance traits independently vary across genotypes inDrosophila melanogaster

et al. 2020

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Cold tolerance, the ability to cope with low temperature stress, is a critical adaptation in thermally variable environments. An individual's cold tolerance comprises several traits including minimum temperatures for growth and activity, ability to survive severe cold, and ability to resume normal function after cold subsides. Across species, these traits are correlated, suggesting they were shaped by shared evolutionary processes or possibly share physiological mechanisms. However, the extent to which cold tolerance traits and their associated mechanisms covary within populations has not been assessed. We measured five cold tolerance traits—critical thermal minimum, chill coma recovery, short‐ and long‐term cold tolerance, and cold‐induced changes in locomotor behavior—along with cold‐induced expression of two genes with possible roles in cold tolerance (heat shock protein 70 and frost)—across 12 lines of Drosophila melanogaster derived from a single population. We observed significant genetic variation in all traits, but few were correlated across genotypes, and these correlations were sex‐specific. Further, cold‐induced gene expression varied by genotype, but there was no evidence supporting our hypothesis that cold‐hardy lines would have either higher baseline expression or induction of stress genes. These results suggest cold tolerance traits possess unique mechanisms and have the capacity to evolve independently.

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“…Moreover, Cheverud's conjecture has shown that well estimated G‐matrices tend to resemble P‐matrices (Cheverud, 1988), especially for morphological traits with generally high heritabilities (i.e., high contribution of genetic factors to overall variance), which is the case for lizard limb traits. Moreover, empirical examples of similarity between G and P are mounting in the literature (e.g., Marroig & Cheverud, 2001; Phillips & Arnold, 1999; Roff, 1996; Sodini et al, 2019; Styga et al, 2019). Finally, we compared A. scriptus P‐matrices with a G‐matrix of the closest relative, A. cristatellus , extracted from McGlothlin et al (2018), and matrices are substantially similar (see Supporting Information, Tables S2 and S3).…”

Section: Methodsmentioning

confidence: 99%

Can extreme climatic events induce shifts in adaptive potential? A conceptual framework and empirical test with Anolis lizards

Simon

Rothier

Donihue

et al. 2023

Journal of Evolutionary Biology

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Multivariate adaptation to climatic shifts may be limited by trait integration that causes genetic variation to be low in the direction of selection. However, strong episodes of selection induced by extreme climatic pressures may facilitate future populationwide responses if selection reduces trait integration and increases adaptive potential (i.e., evolvability). We explain this counter-intuitive framework for extreme climatic events in which directional selection leads to increased evolvability and exemplify its use in a case study. We tested this hypothesis in two populations of the lizard Anolis scriptus that experienced hurricane-induced selection on limb traits. We surveyed populations immediately before and after the hurricane as well as the offspring of post-hurricane survivors, allowing us to estimate both selection and response to selection on key functional traits: forelimb length, hindlimb length, and toepad area.The direct selection was parallel in both islands and strong in several limb traits. Even though overall limb integration did not change after the hurricane, both populations showed a non-significant tendency toward increased evolvability after the hurricane despite the direction of selection not being aligned with the axis of most variance (i.e., body size). The population with comparably lower between-limb integration showed a less constrained response to selection. Hurricane-induced selection, not aligned with the pattern of high trait correlations, likely conflicts with selection occurring during normal ecological conditions that favours functional coordination between limb traits, and would likely need to be very strong and more persistent to elicit a greater change in trait integration and evolvability. Future tests of this hypothesis should use G-matrices in a variety of wild organisms experiencing selection due to extreme climatic events.

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Development of G: a test in an amphibious fish

Cited by 7 publications

References 98 publications

Local adaptation and hybrid failure share a common genetic basis

Local adaptation and hybrid failure share a common genetic basis

Distinct cold tolerance traits independently vary across genotypes inDrosophila melanogaster

Can extreme climatic events induce shifts in adaptive potential? A conceptual framework and empirical test with Anolis lizards

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