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首页> 外文期刊>Aquatic Sciences >Interspecific associations between Hydrilla verticillata and three dominant native genera of submerged macrophytes are taxa dependent
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Interspecific associations between Hydrilla verticillata and three dominant native genera of submerged macrophytes are taxa dependent

机译：疣丝菌和淹没植物的三个优势原生属之间的种间关联是类群依赖的

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摘要

Hydrilla verticillata is a submerged macrophyte that has invaded every continent except Antarctica. In this study, we tested the predictions that (i) H. verticillata invades sites with a higher prevalence of native species; (ii) co-occurrences between the invasive and natives depend on their degree of similarity in morphology and resource use and that (iii) native species morphologically similar to H. verticillata decreases in sites colonized by H. verticillata overtime, while occurrences of morphologically dissimilar species increase post-invasion. The incidences of H. verticillata and three taxa of dominant natives were inspected across 87 sites in a reservoir in South Brazil before and after invasion by H. verticillata. The predictions were tested through co-occurrence metrics and logistic regression analyses. The logistic regression indicated that H. verticillata invaded sites independently of the occurrence of dominant natives, but it co-occurred more than expected by chance with the morphologically dissimilar native Characeae species, Nitella sp. and Chara cf. guairensis. On the other hand, Egeria spp. (morphologically similar to H. verticillata) occurrences were not correlated with the presence of H. verticillata. Moreover, the probability of occurrence of Characeae increased significantly overtime in sites invaded by H. verticillata. These results indicate that H. verticillata invaded sites independently of environmental suitability and likely facilitated more dissimilar taxa, such as Characeae, but there was no evidence that it influenced Egeria spp. occurrences. The patches of H. verticillata probably provide favorable habitats for the establishment of Characeae.
机译：疣丝藻（Hydrilla verticillata）是一种浸没的大型植物，已入侵除南极洲以外的所有大陆。在这项研究中，我们测试了以下预测：（i）轮虫侵染具有较高本地物种流行率的站点； （ii）入侵者与本地人之间的共生取决于它们在形态和资源利用上的相似程度，以及（iii）形态上与黄麻线虫相似的本地物种随着时间的流逝在黄麻线虫定居的地点减少，而形态上的发生却不同入侵后物种增加。在巴西南方水母入侵之前和之后，在巴西南部一个水库的87个站点中检查了主要的本地人的垂直葡萄和三个分类单元的发生率。通过共现度量和逻辑回归分析测试了预测。 Logistic回归分析表明，黄褐斑病菌侵染位点与显性原生种的发生无关，但与形态学不同的原生Characeae物种Nitella sp。相比，共发发生的机会多于预期。和Chara cf.瓜伊尔松。另一方面，Egeria spp。 （在形态上类似于verticalillata）的发生与verticalillata的存在无关。此外，在被轮状线虫侵袭的部位，木犀科发生的可能性随着时间的推移显着增加。这些结果表明，轮虫H. verticillata入侵的地点不受环境适宜性的影响，并可能促进了更多不同的类群，例如Characeae，但没有证据表明它影响了Egeria spp。发生。 verticalillata的斑块可能为Characeae的建立提供了有利的栖息地。

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