کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4496124 1623850 2014 25 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Evolutionary branching under slow directional evolution
ترجمه فارسی عنوان
انشعاب تکاملی تحت تکامل حرکت آهسته
کلمات کلیدی
انتخاب وابسته به فرکانس، خاصیت، پویایی سازگار، صفات دو بعدی، ویژگی های چند بعدی
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک علوم کشاورزی و بیولوژیک (عمومی)
چکیده انگلیسی


• We derive conditions for evolutionary branching in directionally evolving populations.
• The derived conditions extend those for univariate trait spaces to bivariate trait spaces.
• Numerical analyses demonstrate their robustness.
• Our conditions are further extended to multivariate trait spaces.

Evolutionary branching is the process by which ecological interactions induce evolutionary diversification. In asexual populations with sufficiently rare mutations, evolutionary branching occurs through trait-substitution sequences caused by the sequential invasion of successful mutants. A necessary and sufficient condition for evolutionary branching of univariate traits is the existence of a convergence stable trait value at which selection is locally disruptive. Real populations, however, undergo simultaneous evolution in multiple traits. Here we extend conditions for evolutionary branching to bivariate trait spaces in which the response to disruptive selection on one trait can be suppressed by directional selection on another trait. To obtain analytical results, we study trait-substitution sequences formed by invasions that possess maximum likelihood. By deriving a sufficient condition for evolutionary branching of bivariate traits along such maximum-likelihood-invasion paths (MLIPs), we demonstrate the existence of a threshold ratio specifying how much disruptive selection in one trait direction is needed to overcome the obstruction of evolutionary branching caused by directional selection in the other trait direction. Generalizing this finding, we show that evolutionary branching of bivariate traits can occur along evolutionary-branching lines on which residual directional selection is sufficiently weak. We then present numerical analyses showing that our generalized condition for evolutionary branching is a good indicator of branching likelihood even when trait-substitution sequences do not follow MLIPs and when mutations are not rare. Finally, we extend the derived conditions for evolutionary branching to multivariate trait spaces.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Theoretical Biology - Volume 360, 7 November 2014, Pages 290–314
نویسندگان
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