Paul Vincent Debes, Sabine Brigitte Céline Lobligeois, Einar Svavarsson
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引用次数: 0
Abstract
Egg size and fecundity are both positively associated with maternal reproductive success, yet maternal resource limitations result in a trade-off between these two traits. Exploring this trade-off, the extent of genetic and environmental influences on egg size and fecundity and of correlations between these and other traits, and thus, the effects acting within vs. among generations is therefore a central goal in both evolutionary ecology and selective breeding. Using multi-generational captive Arctic charr (Salvelinus alpinus) records, we quantified genetic and environmental effects on and correlations between egg size and fecundity, body size (a proxy for growth) and condition prior to maturation, and body size at maturation. We estimated that genetic contributions to variation in egg size and fecundity are moderate to high. Egg size and fecundity do not significantly correlate at the genetic level but do correlate negatively at the environmental level. Growth prior to maturation and size at maturation are positively correlated with fecundity and egg size at the phenotypic level. Genetic correlations with growth are positive for both egg size and fecundity but weaker for egg size. Contrarily, the environmental correlations with growth are of the opposite sign, also weaker for egg size, and increasing growth leads to decreasing egg size but increasing fecundity. Consequently, reproductive success can be optimized across generations via independent selection responses of egg size or fecundity and by correlated selection responses with body size. Ultimately, the egg size-fecundity resource trade-off in Arctic charr is resolved via growth-controlled phenotypic plasticity acting within generations.
期刊介绍:
Evolutionary Applications is a fully peer reviewed open access journal. It publishes papers that utilize concepts from evolutionary biology to address biological questions of health, social and economic relevance. Papers are expected to employ evolutionary concepts or methods to make contributions to areas such as (but not limited to): medicine, agriculture, forestry, exploitation and management (fisheries and wildlife), aquaculture, conservation biology, environmental sciences (including climate change and invasion biology), microbiology, and toxicology. All taxonomic groups are covered from microbes, fungi, plants and animals. In order to better serve the community, we also now strongly encourage submissions of papers making use of modern molecular and genetic methods (population and functional genomics, transcriptomics, proteomics, epigenetics, quantitative genetics, association and linkage mapping) to address important questions in any of these disciplines and in an applied evolutionary framework. Theoretical, empirical, synthesis or perspective papers are welcome.