ADAPTIVE RADIATION ALONG GENETIC LINES OF LEAST RESISTANCE

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ID: 297782
1996
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Abstract
Are measurements of quantitative genetic variation useful for predicting long-term adaptive evolution? To answer this question, I focus on gmax , the multivariate direction of greatest additive genetic variance within populations. Original data on threespine sticklebacks, together with published genetic measurements from other vertebrates, show that morphological differentiation between species has been biased in the direction of gmax for at least four million years, despite evidence that natural selection is the cause of differentiation. This bias toward the direction of evolution tends to decay with time. Rate of morphological divergence between species is inversely proportional to θ, the angle between the direction of divergence and the direction of greatest genetic variation. The direction of greatest phenotypic variance is not identical with gmax , but for these data is nearly as successful at predicting the direction of species divergence. I interpret the findings to mean that genetic variances and covariances constrain adaptive change in quantitative traits for reasonably long spans of time. An alternative hypothesis, however, cannot be ruled out: that morphological differentiation is biased in the direction gmax because divergence and gmax are both shaped by the same natural selection pressures. Either way, the results reveal that adaptive differentiation occurs principally along "genetic lines of least resistance."
Reference Key
openalex_W1963703713 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Dolph Schluter
Journal international journal of systematic and evolutionary microbiology
Year 1996
DOI
10.1111/j.1558-5646.1996.tb03563.x
URL
https://academic.oup.com/evolut/article-pdf/50/5/1766/48064319/evolut1766.pdf
Keywords Keywords not found

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