贵州高原6种掌突蟾形态特征差异分析

本文通过形态指标测量,比较了分布于贵州高原的6种掌突蟾属(Leptobrachella)物种的形态特征差异。结果显示,头体长比较,6种掌突蟾的头体长从大到小依次为赤水掌突蟾(L.chishiensis).绥阳掌突蟾(L.suiyangensis)、金沙掌突蟾(L.jinshaensis)、毕节掌突蟾(L.biie)、武陵掌突蟾(L.wulingensis)、紫腹掌突蟾(L.purpuraventra);聚类分析显示,在6个物种中,紫腹掌突蟾与毕节掌突蟾差异最大,与赤水掌突蟾差异最小:6种掌突蟾的差异主要表现在吻长/头体长、鼻间距/头体长、上眼睑宽/头体长、胫宽/头体长、后肢长/头体长和第4指长/头体长这6项比值性状上,形态特征判别准确率为75.0%~100.0%,综合判别准确率为90.0%。此外,本研究还对6种掌突蟾的质量特征进行了比较。综合形态测量特征,本研究初步揭示了贵州高原这6种掌突蟾的形态特征差异,为后续掌突蟾属的分类学及谱系地理学研究提供了一定基础。

Analysis on Morphological Characteristics of Six Species of Leptobrachella in Guizhou Plateau

Objectives]In order to reveal the differences in the main morphological characteristics of the Leptobrachella,it is hoped to provide a reference for the subsequent taxonomy and pedigree geography of Leptobrachella.Methods]Apply morphological analysis methods,use the shortest distance method of Euclidean distance for cluster analysis,construct a cluster tree to show the grouping relationship of six species.The stepwise discriminant method is used for discriminant analysis,the trait parameters that contribute greatly to the discrimination are selected,and the discriminant formulas of six species of Leptobrachella are established.The morphological characteristic values of the individuals to be determined are respectively substituted into the discriminant formulas,and the formula values are calculated and compared.The largest is the population to which the individual of Leptobrachella belongs,so as to verify the ability of each main deformation contribution trait to distinguish species.Results]The results indicated that:Morphological character Snout-vent length comparison:From large to small,the snout-vent length of the six species of Leptobrachella are L.chishuiensis,L.suiyangensis,L.jinshaensis,L.bijie,L.wulingensis and L.purpuraventra(Table 3);Cluster analysis showed that among the 6 species,the difference between the L.purpuraventra and the L.bijie was the largest,and the L.purpuraventra and the L.chishuiensis had the smallest difference(Fig.2);The difference of six species of Leptobrachella mainly focused on the ratio of snout length/snout-vent length,intemasal distance/snout-vent length,upper eyelid width/snout-vent length,maximal tibia width/snout-vent length,hindlimb length/snout-vent length,fourth finger length/snout-vent length(Fig.4).The accuracy rate of morphological feature discrimination was 75.0%-100.0%,and the comprehensive discrimination accuracy rate was 90.0%.In addition,we also compared the quality characteristics of six species of Leptobrachella(Table 4),and found that they can also be distinguished by quality characteristics.Conclusion]This study initially revealed the morphological differences of these six species of Leptobrachella in the Guizhou Plateau.It is believed that the Leptobrachella in the Guizhou Plateau can be well distinguished by measurable and qualitative traits.