Lineage‐specific trait variations and plasticity of obligate parthenogenetic animals following the expansion of distribution range to a continental archipelago

生物 谱系(遗传) 非同义代换 进化生物学 表型可塑性 适应(眼睛) 航程(航空) 性状 水蚤 动物 遗传学 表型 基因 水蚤 基因组 材料科学 甲壳动物 神经科学 复合材料
作者
Xiaofei Tian,Masahiro Toyota,Hajime Ohtsuki,Jotaro Urabe
出处
期刊:Journal of Systematics and Evolution [Wiley]
卷期号:62 (4): 775-784 被引量:1
标识
DOI:10.1111/jse.13015
摘要

Abstract Evolutionary theory suggests the hypothesis that among genetically isolated populations, phenotypic variation should be smaller in populations with smaller ratios of nonsynonymous to synonymous substitutions (dN/dS) because smaller dN/dS ratios occur under greater purification selections. Two distinct lineages (JPN1 and JPN2) of panarctic Daphnia cf. pulex sensu Hebert (1995), invaded independently into Japan from North America, provide an excellent opportunity to test this hypothesis because the earlier invader JPN1 has a lower dN/dS ratio than JPN2. Therefore, we examined phenotypic variations in fitness‐related traits, including digestive, life‐history, and morphological traits, among several genotypes within these two lineages. We found that phenotypic variations were smaller within the JPN1 lineage than within the JPN2 lineage. Furthermore, within‐lineage variation of the phenotypic plasticity to changing food levels was smaller in the JPN1 lineage than in the JPN2 lineage. These results support the hypothesis that the JPN1 lineage has been more efficiently subjected to negative selection. However, the magnitude of the phenotypic plasticity of these traits was, on average, at the same level between the JPN1 and JPN2 lineages and its direction differed among genotypes of these lineages, suggesting that the JPN2 genotypes might have exploited niches that were different from those of the JPN1 genotypes.
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