Bait attraction affects the performance of remote underwater video stations in assessment of demersal fish community structure
Bait attraction affects the performance of remote underwater video stations in assessment of demersal fish community structure
复制标题
DOI：
10.3354/meps07192
复制
发表时间：
2007-01-01
影响因子：
2.5
通讯作者：
Kendrick, Gary A.
中科院分区：
文献类型：
--
作者：
Harvey, Euan S.;Cappo, Mike;Kendrick, Gary A.
由于生境内的异质性、行为模式的可变性和生境间鱼类的丰富性，以及在一系列生境中使用捕捞技术时的抽样偏差，在大范围内区分海洋鱼类组合可能很困难。最近开发了远程水下视频站来帮助克服这些问题，但是使用诱饵作为引诱剂引起了对鱼类群落样本中食腐动物和捕食者的偏见的问题。我们比较了在澳大利亚温带和热带大陆架水域中，有饵和无饵的水下视频站区分栖息在不同底栖动物栖息地的鱼类组合的能力，以帮助测试与其他营养类群（如食草动物）相比，诱饵是否吸引了过多的掠食性和食腐性物种到视频中。来自带饵摄像机的数据显示，在热带和温带环境的海洋栖息地之间鱼类组合主坐标的约束典型分析中，有更清晰的区别。关键营养类群分析表明，饵料在不减少草食性和杂食性鱼类丰度的情况下，吸引了更多的掠食性和食腐性鱼类。在生境内，饵料录像的重复样本之间具有更大的相似性，这意味着饵料的使用将提供更好的统计能力，以检测鱼类组合结构的时空变化以及其中单个物种的相对丰度。
Discriminating marine fish assemblages at broad scales can be difficult because of heterogeneity within their habitats, variability in patterns of behaviour and abundance of fish between habitats, and sampling biases in extractive fishing techniques when used across a range of habitats. Remote underwater video stations have recently been developed to help overcome these problems, but the use of bait as an attractant raises questions about bias towards scavengers and predators in samples of fish communities. We compared the ability of baited and unbaited underwater video stations to discriminate between fish assemblages inhabiting distinct benthic habitats in temperate and tropical continental shelf waters in Australia, to help test whether the bait attracted predatory and scavenging species to the video in disproportionate numbers in comparison to other trophic groups, such as herbivores. Data from baited video cameras displayed a clearer discrimination in constrained canonical analysis of principal coordinates of fish assemblages between marine habitats in both tropical and temperate environments. Analysis of the key trophic groups indicated that bait attracted greater numbers of predatory and scavenging species without decreasing the abundances of herbivorous or omnivorous fishes. There was greater similarity between replicate samples from baited video within habitats, implying that the use of bait will provide better statistical power to detect spatial and temporal changes in the structure of fish assemblages and the relative abundances of individual species within them.