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Quantifying herbivory across a coral reef depth gradient

机译：量化珊瑚礁深度梯度上的食草动物

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Despite the widely accepted importance of herbivory as a determinant of reef benthic community structure, few studies have examined the relative contributions of individual species to ecosystem processes at the whole reef scale. This study quantifies the grazing impact of individual species of roving herbivorous fishes across an inner shelf fringing reef at Orpheus Island, Great Barrier Reef, Australia. Estimates of roving herbivore impact based on dawn to dusk observations of feeding rates, measurement of bite sizes and relative abundance revealed that the Orpheus Island system was dominated by 3 species: Scarus rivulatus, Chlorurus microrhinos and Siganus doliatus. The estimated impact of all 3 species varied significantly across the reef depth gradient, with the rate of disturbance peaking at the crest and decreasing significantly down the slope and across the reef flat. The estimated species-specific disturbance levels suggested that during the course of a single month 104% of a square metre area of the reef crest is grazed by S. rivulatus while 40% is subject to grazing by C. microrhinos. A total of 26 cm~3 of algal material is removed from the same area by S. doliatus. Overall, there was a 240-fold decrease in grazing activity across the reef flat from that at the crest. The pattern of grazing impact of the numerically dominant siganid and scarid fishes was negatively correlated with the distribution of macroalgae across the same reef gradient. The results of the current study provide support for the hypothesis that algal community structure is shaped by levels of herbivory.
机译：尽管食草作为决定礁底栖生物群落结构的重要因素已广为接受，但很少有研究检查整个珊瑚礁范围内单个物种对生态系统过程的相对贡献。这项研究量化了在澳大利亚大堡礁奥菲斯岛的内层架礁上游动的草食性鱼类个体的放牧影响。根据从早到晚的喂食速度，叮咬大小和相对丰度的观测值对草食性草食动物的影响进行估算，结果表明，奥菲斯岛系统主要由以下三种物种组成：Scarus rivulatus，Chlorurus microrhinos和Siganus doliatus。在珊瑚礁深度梯度范围内，所有这三种物种的影响估计都发生了显着变化，扰动速率在波峰处达到峰值，并在斜坡下方和整个珊瑚礁平面上显着降低。估计的特定物种扰动水平表明，在一个月的时间内，小溪S就掠夺了礁顶的每平方米104％的面积，而小犀牛则掠过了40％的面积。用同样的方法，从同一地区去除了总计26 cm〜3的藻类材料。总体而言，整个礁滩的放牧活动比波峰处的放牧活动减少了240倍。在相同的珊瑚礁梯度上，数量占优势的硅藻类和甲壳类鱼类的放牧影响方式与大型藻类的分布呈负相关。当前研究的结果为藻类群落结构受草食动物水平影响的假说提供了支持。

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