Does size matter most? The effect of growth history on probabilistic reaction norm for salmon maturation
Does size matter most? The effect of growth history on probabilistic reaction norm for salmon maturation
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DOI：
10.1111/j.0014-3820.2006.tb01230.x
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发表时间：
2006-07-01
期刊：
影响因子：
3.3
通讯作者：
Fukuwaka, Masa-Aki
中科院分区：
文献类型：
--
作者：
Morita, Kentaro;Fukuwaka, Masa-Aki
人们普遍认为，体型对性成熟的发生有影响。最近的研究使用了成熟概率为50%的特定年龄体型的变化，这是概率反应规范的一个特征，以量化所谓的生活史进化。然而，身体的大小是由连续发育阶段的生长速度组合而成的。因此，为了了解成熟进程的演变，有必要了解个体大小、生长历史和成熟进程之间的关系。我们研究了鲑鱼(Oncorhynchus Keta)的体型、既往生长历史和成熟率之间的关系。在这项研究中，以前的生长历史是通过提供描述身体大小的信息的年度特定生长增量来估计的。先前的生长史被发现与成熟概率的关系比身体大小更密切。最新的生长条件是影响一条鱼在随后的繁殖季节是否成熟的最重要因素。由于体型相似、年龄相同的个体具有不同的生长历史，体型与成熟率之间的关系可能会受到生长历史的可塑性修正。这可能违反了推断进化所需的假设，即概率反应规范中与大小相关的成熟趋势不受生长历史的影响。
Body size is widely believed to affect the occurrence of sexual maturation. Recent studies have used changes in the age-specific body size at which the probability of maturing is 50%, a feature of probabilistic reaction norms, to quantify purported evolution of life histories. However, body size results from a combination of growth rates during successive developmental stages. Therefore, to understand the evolution of the maturation schedule, it is necessary to comprehend the relationships among body size, growth history, and maturation schedule. We examined the relationships among body size, previous growth history, and maturation probability in chum salmon (Oncorhynchus keta). In this study, previous growth history was estimated from yearly specific growth increments that provide information describing body size. Previous growth history was found to be more closely linked to maturation probability than body size. The most recent growth condition was the most important factor affecting whether a fish matured during the subsequent breeding season. Because individuals of similar body size and same age can have different growth histories, the relationship between body size and maturation probability could be plastically modified by growth history. This may violate an assumption required to infer evolution, namely that size-related maturation trends in probabilistic reaction norms are immune to growth history.