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首页> 外文期刊>Neotropical Ichthyology >Is coexistence between non-native and native Erythrinidae species mediated by niche differentiation or environmental filtering? A case study in the upper Paran?? River floodplain
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Is coexistence between non-native and native Erythrinidae species mediated by niche differentiation or environmental filtering? A case study in the upper Paran?? River floodplain

机译：生态位分化或环境过滤介导非本地和本地红藻物种之间的共存吗？上巴拉那州的一个案例研究？河漫滩

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The limiting similarity theory predicts that divergence in the functional traits of native and introduced species is an essential component in species establishment, as introduced species must occupy a niche that is unoccupied by resident species. On the other hand, the environmental filtering hypothesis predicts convergence between introduced and native species, as both possess traits that make them adapted to the local abiotic environment. Morphology, spatial co-occurrence, diet, feeding selectivity, and niche breadth and overlap of Erythrinidae were evaluated to detect possible mechanisms acting in the coexistence between non-native and native species. Native ( Hoplias sp. B and Hoplias cf. malabaricus ) and non-native ( Hoplerythrinus unitaeniatus and Hoplias mbigua ) species presented differences in morphological traits, spatial co-occurrence, diet, selectivity, and niche breadth and overlap. The mechanisms mediating species coexistence seem to vary according to species. The absence of spatial and feeding overlap suggests that non-native species H. unitaeniatus occupy a different niche than native species, supporting its successful establishment without eliminating the native species. However, low feeding overlap and similar morphologies between non-native and native species of Hoplias point to environmental filters; in this case, the non-native H. mbigua is able to establish due to similarities in functional traits.
机译：有限相似理论预测，本地物种和引进物种的功能性状差异是物种建立的重要组成部分，因为引进物种必须占据常住物种不占据的生态位。另一方面，环境过滤假说预测了引进物种和本地物种之间的趋同，因为它们都具有使它们适应当地非生物环境的特征。评估形态，空间共生，饮食，进食选择性以及赤藓科的生态位宽度和重叠，以检测可能作用于非本地物种与本地物种共存的机制。本地（霍普利亚斯菌B和霍普利亚斯比马拉巴里克斯）和非本地（霍普里斯菌单胞菌和霍普利亚斯mbigua）物种表现出形态特征，空间共生，饮食，选择性和利基广度和重叠的差异。介导物种共存的机制似乎因物种而异。空间和觅食重叠的缺乏表明，非本地物种单胞菌H. unitaeniatus与本地物种相比占有不同的生态位，支持其成功建立而没有消除本地物种。然而，霍普利亚斯非本地物种和本地物种之间的低进食重叠和相似的形态表明环境过滤器。在这种情况下，由于功能性状的相似性，非本地H. mbigua能够建立。

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