Genetic and Environmental (Co)variation of Egg Size, Fecundity, and Growth Traits in Arctic Charr

IF 3.5 2区 生物学 Q1 EVOLUTIONARY BIOLOGY
Paul Vincent Debes, Sabine Brigitte Céline Lobligeois, Einar Svavarsson
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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.

Abstract Image

北极鲑卵大小、繁殖力和生长性状的遗传和环境变异
卵的大小和繁殖力都与母亲的繁殖成功呈正相关,然而母亲的资源限制导致这两个特征之间的权衡。因此,探索这种权衡,遗传和环境对卵的大小和繁殖力的影响程度,以及这些和其他性状之间的相关性,以及代内与代间的影响,是进化生态学和选择育种的中心目标。利用多代圈养北极鲑(Salvelinus alpinus)的记录,我们量化了遗传和环境对卵大小与繁殖力、体大小(生长的代表)和成熟前条件以及成熟时体大小之间的影响和相关性。我们估计遗传对卵的大小和繁殖力的影响是中等到高的。卵大小与繁殖力在遗传水平上无显著相关,但在环境水平上呈负相关。在表型水平上,成熟前的生长和成熟时的大小与繁殖力和卵的大小呈正相关。卵的大小和繁殖力与生长的遗传相关性均为正,而卵的大小与生长的遗传相关性较弱。相反,环境与生长的相关性呈相反的符号,对卵的大小也较弱,生长的增加导致卵的大小减少,但繁殖力增加。因此,生殖成功可以通过卵大小或繁殖力的独立选择反应和体型大小的相关选择反应来优化。最终,北极charr的卵大小-繁殖力资源权衡是通过在代内作用的生长控制表型可塑性来解决的。
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来源期刊
Evolutionary Applications
Evolutionary Applications 生物-进化生物学
CiteScore
8.50
自引率
7.30%
发文量
175
审稿时长
6 months
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.
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