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首页> 外文期刊>Estuarine Coastal and Shelf Science >Idiosyncratic responses of meiofaunal assemblages to hippo dung inputs in an estuarine lake
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Idiosyncratic responses of meiofaunal assemblages to hippo dung inputs in an estuarine lake

机译：Meiofaunal组装到河马湖北河马进入的特质回应

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Animal-mediated trophic resource transfers are important determinants of ecosystem functioning but are influenced by anthropogenic activities. In Africa, hippo defecation can influence aquatic processes at multiple scales, yet little is known about this phenomenon, with repercussions for estuarine benthic ecosystems being a particularly important knowledge gap. Here, we use in situ experiments to test responses of benthic meiofauna to dung loading in the St Lucia Estuary, which is Africa's largest estuarine ecosystem and home to one of South Africa's largest hippo populations. Findings indicate that high dung-loading levels negligibly affect meiofaunal community structure, with few community and individual metrics responding significantly. Richness and diversity displayed differential responses at the two experimental sites, with increasing trends occurring at the first site following dung addition but with a reversal at the second site. Similar findings were recorded for abundances of juvenile Assiminea cf. capensis (gastropod) and sizes of Nemata. In relation to prior findings for macrofauna from the same experiment, meiofaunal responses appeared weak and spatially idiosyncratic. We conclude that meiofauna are more robust and opportunistic than macrofauna in responding to dung-loading and suggest that high input rates may shift benthic communities from larger macrofaunal groups to smaller meiofaunal assemblages. We advocate that understanding traits of recipient assemblages that determine their susceptibility to hippo dung is necessary to develop a predictive understanding of this phenomenon. This would be especially important in protected areas that experience freshwater deprivation and support large and expanding hippo populations.
机译：动物介导的营养性资源转移是生态系统功能的重要决定因素，但受到人类活性的影响。在非洲，河马排便可以影响多种尺度的水生过程，但对这种现象知之甚少，对雌曲线的反应是嗜酸盐的生态系统是一个特别重要的知识差距。在这里，我们使用原位实验来测试宾果Meiofauna在圣卢西亚河口的粪便装载的反应，这是非洲最大的河马生态系统和南非最大的河马人口之一。调查结果表明，高粪堆水平可忽略贫富群落结构，很少有社区和个人指标显着响应。丰富和多样性在两个实验部位显示差异响应，随着第一个站点发生的趋势越来越多，但在第二个地点逆转。对于丰富的少年同析酶的丰富，记录了类似的结果。 Capensis（Gastropod）和Nemata的尺寸。关于来自同一实验的宏指令的先前发现，Meiofaunal反应出现了弱和空间的特质。我们得出结论，Meiofauna比致粪装载的宏指令更强大，机会主义，并表明高投入率可能将底栖社区从较大的大型宏观组转移到较小的Meiofaunal组装中。我们倡导理解可获得对河马粪便敏感性的受援人员的特征是制定对这种现象的预测理解。这在受到淡水剥夺和支持大型和扩大河马人口的保护区中尤为重要。

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