Additive genetic variance for lifetime fitness and the capacity for adaptation in an annual plant
| Autor: | Ruth G. Shaw, Rachel E. Pain, Seema N. Sheth, Mason W. Kulbaba, Vincent M. Eckhart |
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| Rok vydání: | 2019 |
| Předmět: |
0301 basic medicine
0106 biological sciences Time Factors Genotype Direct assessment Population 010603 evolutionary biology 01 natural sciences 03 medical and health sciences Genetic variation Statistics Genetics Chamaecrista Selection Genetic education Ecology Evolution Behavior and Systematics Selection (genetic algorithm) 030304 developmental biology Local adaptation 2. Zero hunger education.field_of_study 0303 health sciences Natural selection Geography Models Genetic biology Fisher's fundamental theorem of natural selection Genetic Variation biology.organism_classification Adaptation Physiological Biological Evolution Pedigree Chamaecrista fasciculata 030104 developmental biology Genetics Population Seeds Genetic Fitness Seasons Annual plant Adaptation General Agricultural and Biological Sciences Demography |
| DOI: | 10.1101/601682 |
| Popis: | The immediate capacity for adaptation under current environmental conditions is directly proportional to the additive genetic variance for fitness, VA(W). Mean absolute fitness,, is predicted to change at the rate, according to Fisher’s Fundamental Theorem of Natural Selection. Despite ample research evaluating degree of local adaptation, direct assessment of VA(W) and the capacity for ongoing adaptation is exceedingly rare. We estimated VA(W) andin three pedigreed populations of annualChamaecrista fasciculata,over three years in the wild. Contrasting with common expectations, we found significant VA(W) in all populations and years, predicting increased mean fitness in subsequent generations (0.83 to 6.12 seeds per individual). Further, we detected two cases predicting “evolutionary rescue”, where selection on standing VA(W) was expected to increase fitness of declining populations (< 1.0) to levels consistent with population sustainability and growth. Within populations, interannual differences in genetic expression of fitness were striking. Significant genotype-by-year interactions reflected modest correlations between breeding values across years (allr< 0.490), indicating temporally variable selection at the genotypic level; that could contribute to maintaining VA(W). By directly estimating VA(W) and total lifetime, our study presents an experimental approach for studies of adaptive capacity in the wild. |
| Databáze: | OpenAIRE |
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