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首页> 外文期刊>Estuarine Coastal and Shelf Science >Spatial patterns in fish herbivory in a temperate Australian seagrass meadow
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Spatial patterns in fish herbivory in a temperate Australian seagrass meadow

机译：温带澳大利亚海草草甸鱼类食草的空间格局

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Seagrass grazing by fish was measured in a large seagrass-dominated temperate bay (Geographe Bay, Western Australia) to examine whether: (1) seagrass herbivory occurs; (2) the level of herbivory is influenced by nitrogen in seagrass leaves; and (3) how herbivory and herbivorous fish communities vary with water depth and seagrass species. Species and abundance of fish and herbivore bite marks on seagrass leaves were recorded from diver surveys of 23 sites of varying depth ranging from 1 m to 18 m. Posidonia sinuosa, Posidonia coriacea, Amphibolis griffithii, and Amphibolis antarctica seagrass leaves were collected, dried and analysed for total nitrogen. Evidence for low levels of seagrass grazing was found at over half the sites surveyed, though high levels of grazing were recorded at only one site. An east-west pattern was observed in the location of grazed sites and of herbivorous fish species that corresponded with the general prevalence of patch reefs, indicating that reef associated fish assemblages may be responsible for the observed grazing. Total nitrogen was elevated in seagrass leaves associated with drains, although increased nitrogen was not associated with increased grazing. While grazing was recorded in this temperate seagrass meadow, the abundance of herbivorous fish was low and the amount of biomass removed by them was small compared to the balance of the meadow remaining, and to seagrass grazing studies elsewhere.
机译：在一个以海草为主的温带海湾（西澳大利亚州的Geographe海湾）中测量了鱼类放牧的海草，以检查是否：（1）发生了海草草食性； （2）食草水平受海草叶片中氮的影响； （3）食草和食草鱼类群落如何随水深和海草种类而变化。通过对23个深度在1 m至18 m之间的地点进行的潜水员调查，记录了海草叶上鱼类和草食动物叮咬痕迹的种类和数量。收集中国马铃薯波塞冬，波斯尼亚波塞冬，格里菲两栖类和南极洲两栖类海草叶片，干燥并分析总氮。在超过一半的调查地点发现了低水平的海草放牧证据，尽管只有一个地点记录了高水平的放牧。在放牧的地点和草食性鱼类的位置观察到了一种东西向格局，与斑块礁的普遍流行相对应，这表明与礁石有关的鱼群可能是所观察到的放牧的原因。与排水沟相关的海草叶中总氮升高，尽管氮的增加与放牧的增加无关。尽管在这个温带的海草草地上有放牧记录，但是草食性鱼类的丰度很低，与草场剩余的草地相比，以及其他地方的海草吃草研究，草食性鱼类的生物量少。

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