Life history variation in North American freshwater minnows: effects of latitude and phylogeny
Life history variation in North American freshwater minnows: effects of latitude and phylogeny
复制标题
北美淡水米诺鱼的生活史变异：纬度和系统发育的影响
作者：
N. Gotelli;M. Pyron
本文报道了21种具有明确亲缘关系的北美鱼的生活史特征。只有一个生活史特征与纬度显著相关：高纬度物种的产卵季节比低纬度物种短。两个措施的身体大小显示出证据的系统发育相关。雌性总体长在成熟期和最大雌性总体长更接近密切相关的物种对比远亲物种对。此外，总的女性身体长度在成熟时与每个物种的位置在Mayden的鲤科鱼类的分支图：物种接近的根的分支图有相对较小的身体尺寸相比，更远离分支图根的物种。这种模式让人想起科普的法则，即在一个谱系中，身体大小的谱系增长。尽管系统发育相关性在高分类学水平上最常见（佩格尔和哈维的“分类级效应”），但系统发育是这个密切相关的小鱼群体体型的重要预测因素。无论是历史因素，如系统发育关系，和生态因素，如纬度，可能有助于种间的生活史性状的变化？
tion in life history traits of 21 species of North American minnows with a wellresolved phylogeny. Only one life history trait was significantly correlated with latitude: species at higher latitudes had shorter spawning seasons than did species at lower latitudes. Two measures of body size showed evidence of a phylogenetic correlate. Total female body length at maturity and maximum total female body length were more similar for closely related species pairs than for distantly related species pairs. Moreover, total female body length at maturity was correlated with the position of each species in Mayden's cladogram of cyprinid fishes: species close to the root of the cladogram had relatively small body sizes compared with species that were more distant from the cladogram root. This pattern is reminiscent of Cope's Law of phyletic increase in body size within a lineage. Although phylogenetic correlates are most common at high taxonomic levels (the "taxon-level effect" of Pagel and Harvey), phylogeny was a significant predictor of body size in this closely related group of minnows. Both historical factors, such as phylogenetic relationships, and ecological factors, such as latitude, probably contribute to interspecific variation in life history traits of minnows.