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Direct versus indirect methods of quantifying herbivore grazing impact on a coral reef

机译：定量草食动物放牧对珊瑚礁影响的直接方法与间接方法

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摘要

Two methods were used to assess the grazing impact of roving herbivorous fishes across a coral reef depth gradient within Pioneer Bay, Orpheus Island, Great Barrier Reef. The first technique employed was a method traditionally used to quantify herbivory on coral reefs via the (indirect) inference of herbivore impact from biomass estimates and reported feeding rates. The second method (one of a range of direct approaches) used remote underwater video cameras to film the daily feeding activity of roving herbivores in the absence of divers. Both techniques recorded similar patterns and relative levels of herbivore biomass across five reef zones at the study site. Indirect estimates of the grazing impact across the reef depth gradient of the three predominant species of herbivore broadly coincided with levels quantified directly by remote underwater video, indicating that, to a large extent, presence does correspond to function. However, the video data suggested that, for individual species in particular reef zones, the absolute level of impact may be less than that inferred from presence. In the case of the parrotfish Scarus rivulatus, the video recordings suggested that, at the reef crest, an average of 52% (±18 SE) of each m~2 area of reef would be grazed each month, compared with an area of 109% (±41 SE) suggested by inferring grazing activity from presence alone. Potential biases associated with remote video recorders may explain some of the discrepancy between values. Overall, the results suggest that, for some fish groups, the indirect method of inferring function from presence can provide a good indication of relative levels of herbivore impact across a coral reef.
机译：在大堡礁奥菲斯岛先驱湾内，采用两种方法来评估草食性鱼类在珊瑚礁深度梯度上的放牧影响。所采用的第一种技术是传统上用于通过（间接）从生物量估计值和报告的进食率推断出草食动物影响的方法来量化珊瑚礁上的草食动物的方法。第二种方法（一系列直接方法中的一种）使用远程水下摄像机在没有潜水员的情况下拍摄草食动物的日常摄食活动。两种技术都记录了研究地点五个珊瑚礁区的食草动物生物量的相似模式和相对水平。食草动物的三种主要物种的跨礁深度梯度的放牧影响的间接估计与远程水下视频直接量化的水平大致相符，表明在很大程度上，存在确实与功能相对应。但是，视频数据表明，对于特定礁区中的单个物种，影响的绝对水平可能小于根据存在而推断的水平。对于鹦鹉鱼Scarus rivulatus，视频记录表明，在礁顶处，每个m〜2礁石区域平均每月放牧52％（±18 SE），相比之下，面积为109。 ％（±41 SE）的建议是通过单独存在来推断放牧活动。与远程录像机相关的潜在偏差可能解释了值之间的某些差异。总体而言，结果表明，对于某些鱼类而言，通过存在推断功能的间接方法可以很好地表明草食动物对整个珊瑚礁影响的相对水平。

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  • 来源
    《Marine biology》 |2008年第2期|p.325-334|共10页
  • 作者

    Rebecca J. Fox; David R. Bellwood;

  • 作者单位

    Australian Research Council Centre of Excellence for Coral Reef Studies, James Cook University, Townsville, QLD 4811, Australia;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境生物学;
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