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首页> 外文期刊>Estuarine Coastal and Shelf Science >Alien reef-building polychaete drives long-term changes in invertebrate biomass and diversity in a small, urban estuary
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Alien reef-building polychaete drives long-term changes in invertebrate biomass and diversity in a small, urban estuary

机译：外来珊瑚礁建造的多毛类动物在一个较小的城市河口中驱动无脊椎动物生物量和多样性的长期变化

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摘要

Two of the greatest threats to native biodiversity are the construction of artificial structures in natural environments and the introduction of invasive species. As the development and urbanisation of estuaries continues at an increasing rate worldwide, these environments are being simultaneously affected by these threats. This study quantifies the spread of an invasive reef-building polychaete, Ficopomatus enigmaticus, in a small, highly manipulated urban estuary in South Africa and investigates its role as an ecosystem engineer. Anthropogenic changes to the Zandvlei Estuary, including construction of a rubble weir and canalisation near the estuary mouth, construction of an extensive marina development and hardening of the banks with concrete, have facilitated the expansion of F. enigmaticus. The standing stock of F. enigmaticus increased from 13.69 t, as measured in 1986, to 50.03 t in 2012, due both to increase in the total area colonised and standing stock per m~2. Since F. enigmaticus reefs support a greater biomass of infauna than adjacent sandy areas, total invertebrate biomass in the estuary is estimated to have increased from less than 0.30 t in 1942, to over 56.80 t in 2012, due mainly to hardening of banks in parts of the main estuary with concrete and construction of a marina system. A positive correlation between reef mass and infaunal biomass, density and diversity was also found.
机译：对本地生物多样性的两个最大威胁是在自然环境中建造人工结构和引入入侵物种。随着世界范围内河口的发展和城市化的持续增长，这些环境同时受到这些威胁的影响。这项研究量化了在南非一个小型，高度人为操纵的城市河口中，一个侵入性珊瑚礁建造的多毛鱼类（Ficopomatus enigmaticus）的扩散，并调查了其作为生态系统工程师的作用。赞德弗莱河口的人为变化，包括在河口附近修建碎石堰和渠化，广泛的码头开发建设以及混凝土硬化堤岸，都促进了莫氏金龟（F. enigmaticus）的扩张。由于殖民化的总面积和每m〜2的立木蓄积量的增加，F。enigmaticus的立木蓄积量从1986年的13.69 t增加到2012年的50.03 t。由于莫尼卡莫尼卡斯礁支持的动物内生物量要多于邻近的沙地，因此河口中无脊椎动物的总生物量估计从1942年的不到0.30吨增加到2012年的56.80吨，这主要是由于部分河岸的硬化主要河口的混凝土和码头系统的建设。还发现珊瑚礁质量与主要生物量，密度和多样性之间呈正相关。

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