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

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

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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.

asexual animalgenetic variationinvasion organismphenotypic plasticityphenotypic traitzooplankton

Xiao-Fei Tian、Maki Toyota、Hajime Ohtsuki、Jotaro Urabe

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Fishery College,Zhejiang Ocean University,Zhoushan 316022,China

Aquatic Ecology Laboratory,Graduate School of Life Sciences,Tohoku University,Senda 980-8578,Japan

Institute of Freshwater Biology,Nagano University,Ueda 386-0031,Japan

Province Key Research and Development Program of ZhejiangMEXT Scholarship by the Japanese GovernmentJapan Society for the Promotion of Science(JSPS)Grantin-Aid for Scientific Research(KAKENHI)Japan Society for the Promotion of Science(JSPS)Grantin-Aid for Scientific Research(KAKENHI)Japan Society for the Promotion of Science(JSPS)Grantin-Aid for Scientific Research(KAKENHI)Environment Research and Technology Development Fund by the Ministry of Environment,Japan

2021C0204715H0264216H0252220H033154-2103

2024

10.1111/jse.13015

植物分类学报
中国科学院植物研究所　中国植物学会

植物分类学报

CSTPCD
影响因子：0.322
ISSN：1674-4918
年,卷(期)：2024.62(4)