• 主题
高级搜索  >
历史搜索 清空历史
首页> 美国卫生研究院文献>PLoS Clinical Trials >Patchiness and Co-Existence of Indigenous and Invasive Mussels at Small Spatial Scales: The Interaction of Facilitation and Competition
【2h】

Patchiness and Co-Existence of Indigenous and Invasive Mussels at Small Spatial Scales: The Interaction of Facilitation and Competition

机译：小空间尺度上的土著贻贝和入侵贻贝的斑块与并存：促进与竞争的相互作用

代理获取
本网站仅为用户提供外文OA文献查询和代理获取服务，本网站没有原文。下单后我们将采用程序或人工为您竭诚获取高质量的原文，但由于OA文献来源多样且变更频繁，仍可能出现获取不到、文献不完整或与标题不符等情况，如果获取不到我们将提供退款服务。请知悉。
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Ecological theory predicts that two species with similar requirements will fail to show long-term co-existence in situations where shared resources are limiting, especially at spatial scales that are small relative to the size of the organisms. Two species of intertidal mussels, the indigenous Perna perna and the invasive Mytilus galloprovincialis, form mixed beds on the south coast of South Africa in a situation that has been stable for several generations of these species, even though these populations are often limited by the availability of space. We examined the spatial structure of these species where they co-exist at small spatial scales in the absence of apparent environmental heterogeneity at two sites, testing: whether conspecific aggregation of mussels can occur (using spatial Monte-Carlo tests); the degree of patchiness (using Korcak B patchiness exponent), and whether there was a relationship between percent cover and patchiness. We found that under certain circumstances there is non-random conspecific aggregation, but that in other circumstances there may be random distribution (i.e. the two species are mixed), so that spatial patterns are context-dependent. The relative cover of the species differed between sites, and within each site, the species with higher cover showed low Korcak B values (indicating low patchiness, i.e. the existence of fewer, larger patches), while the less abundant species showed the reverse, i.e. high patchiness. This relationship did not hold for either species within sites. We conclude that co-existence between these mussels is possible, even at small spatial scales because each species is an ecological engineer and, while they have been shown to compete for space, this is preceded by initial facilitation. We suggest that a patchy pattern of co-existence is possible because of a balance between direct (competitive) and indirect (facilitative) interactions.
机译：生态学理论预测，在共享资源有限的情况下，尤其是在相对于生物体规模较小的空间尺度上，具有相似要求的两个物种将无法长期共存。两种潮间贻贝，本土的Perna perna和侵入性的Mytilus galloprovincialis，在南非南部海岸形成了混合床，这种情况在几代人中一直保持稳定，尽管这些种群通常受到供应的限制。空间。我们研究了这些物种的空间结构，它们在较小的空间尺度上共存，并且在两个地点都没有明显的环境异质性，测试：是否会发生贻贝的同种聚集（使用空间蒙特卡洛测试）；斑块程度（使用Korcak B斑块指数），以及覆盖率和斑块之间是否存在关系。我们发现，在某些情况下存在非随机的特定聚集，但在其他情况下可能存在随机分布（即两种物种混合在一起），因此空间模式取决于上下文。物种的相对覆盖度在站点之间有所不同，并且在每个站点内，具有较高覆盖率的物种显示出较低的Korcak B值（表明斑驳性较低，即存在较少，较大的斑块），而物种较少的物种则呈现相反的方向，即高斑点。对于站点内的任何一个物种，这种关系均不成立。我们得出的结论是，即使在较小的空间范围内，这些贻贝之间也可以共存，因为每种物种都是生态工程师，并且尽管它们被证明可以竞争太空，但在此之前需要进行初步的促进。我们建议，由于直接（竞争性）和间接（促进性）交互之间的平衡，因此可能会出现一种修补的共存模式。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
代理获取

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号