Tab. 2 in Is coexistence between non-native and native Erythrinidae species mediated by niche differentiation or environmental filtering? A case study in the upper Paraná River floodplain
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Tab. 2. Pearson’s correlation coefficients (r) obtained among the ecomorphological indices for axes 1 and 3 of the principal components analysis (PCA) applied to the correlation matrix formed by 19 indices describing nonnative (H. mbigua and H. unitaeniatus) and native (Hoplias sp. B and H. cf. malabaricus) Erythrinidae species. At the lower level, the eigenvalues predicted by the broken-stick model and the proportions of the accumulated and explained variability are described. The indices with higher correlation values (in bold) were selected for interpretation. Ecomorphological indicesPCA axesr PC 1r PC 3Aspect ratio of anal fin-0.32-0.15Aspect ratio of caudal fin-0.32-0.06Aspect ratio of pectoral fin-0.27-0.20Aspect ratio of pelvic fin-0.31-0.05Compression index-0.080.26Compression index of caudal peduncle-0.250.31Depression index0.230.12Eye position0.28-0.14Relative area of dorsal fin0.320.23Relative area of eye0.300.22Relative height of anal fin0.12-0.34Relative height of body-0.020.38Relative height of caudal peduncle-0.25-0.14Relative height of dorsal fin0.16-0.25Relative height of head-0.250.07Relative length of caudal peduncle-0.070.25Relative length of head-0.010.34Relative width of caudal peduncle0.17-0.29Relative width of head-0.170.14Predicted eigenvalue: broken-stick3.552.05Eigenvalue5.322.20Explained variability (%)28.0111.56Accumulated variability (%)28.0139.56
表2 主成分分析（PCA，Principal Components Analysis）应用于由19项指标构建的相关矩阵，该矩阵用于描述外来物种（mbigua狼牙脂鲤*H. mbigua*与单带狼牙脂鲤*H. unitaeniatus*）及本土物种（狼牙脂鲤属*Hoplias* sp. B与疑似马拉巴狼牙脂鲤*H. cf. malabaricus*）所属的虎脂鲤科（Erythrinidae）物种的生态形态学指标（ecomorphological indices），表中列出了该分析轴1与轴3对应的生态形态学指标间的皮尔逊相关系数（Pearson’s correlation coefficients，r）。表格下方同时列出了折断棍模型（broken-stick model）预测的特征值，以及累积变异与解释变异的占比。其中相关系数较高的指标（以粗体标注）被选作后续解读之用。 生态形态学指标 r PC1 r PC3 臀鳍长宽比 -0.32 -0.15 尾鳍长宽比 -0.32 -0.06 胸鳍长宽比 -0.27 -0.20 腹鳍长宽比 -0.31 -0.05 体压缩指数 -0.08 0.26 尾柄压缩指数 -0.25 0.31 体扁平指数 0.23 0.12 眼位 0.28 -0.14 背鳍相对面积 0.32 0.23 眼相对面积 0.30 0.22 臀鳍相对高度 0.12 -0.34 体相对高度 -0.02 0.38 尾柄相对高度 -0.25 -0.14 背鳍相对高度 0.16 -0.25 头相对高度 -0.25 0.07 尾柄相对长度 -0.07 0.25 头相对长度 -0.01 0.34 尾柄相对宽度 0.17 -0.29 头相对宽度 -0.17 0.14 折断棍模型预测特征值 3.55 2.05 特征值 5.32 2.20 解释变异占比（%） 28.01 11.56 累积变异占比（%） 28.01 39.56
