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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Visual censuses of tropical fish aggregations on artificial reefs: slate versus video recording techniques
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Visual censuses of tropical fish aggregations on artificial reefs: slate versus video recording techniques

机译：人工礁上热带鱼聚集的视觉普查：石板与录像技术

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Artificial coastal reefs were initially installed off Reunion Island (SW Indian Ocean) in order to attract and catch small pelagic fish of economic importance for the local fishery. These artificial reefs also attract a high density of juvenile coral reef fish, especially after recruitment. Because of high species richness and density, a suitable method of evaluating diversity and abundance in such assemblages is needed. An experiment was conducted in situ for 1 year in order to test which of the two visual techniques, slate or video recording, would be the most suitable for sampling artificial reefs. For the quantitative study, a rope framework (four belt transects each measuring 24x3 m) was used to ease the movement of the divers. To avoid bias due to time variations, the study was conducted under limited time in situ. The advantages and disadvantages of the two techniques regarding the accuracy of qualitative and quantitative results are discussed. The qualitative study results show that the slate technique is the most accurate one for determining species richness. In the quantitative study, factors such as species characteristics (ecological type), attractiveness (relationship between fish and diver) and abundance of fish communities around the artificial reefs appear to influence our results on the comparison of the two techniques. Of 13 'permanent' (observed in more than 75% of dives) species, 6 returned a similar frequency of detection by slate and video (Lutjanus kasmira, Lutjanus bengalensis, Priacanthus hamrur, Chaetodon kleinii, Heniochus diphreutes, Mulloides vanicolensis); these were then selected for comparison of the techniques using quantitative data. The correlation between video and slate census results is high, but, in comparison with the slate census, the Video census underestimates abundance, especially for low values. A corrected index is proposed to remedy this underestimation; it could be used for video surveys conducted on species responding well to video detection (as below).
机译：最初在留尼汪岛（印度洋西南部）附近安装了人工沿海礁石，以吸引和捕捞对当地渔业具有重要经济意义的小型中上层鱼类。这些人造礁石还吸引了高密度的幼年珊瑚礁鱼，特别是在招募后。由于物种丰富度和密度高，因此需要一种合适的方法来评估此类种群的多样性和丰度。为了测试两种视觉技术（板岩或视频记录）中的哪一种最适合采样人工鱼礁，进行了为期一年的原位实验。为了进行定量研究，使用了绳索框架（四个带状样带，每个样带尺寸为24x3 m）来减轻潜水员的活动。为避免因时间变化而产生偏差，该研究在有限的原位时间进行。讨论了这两种技术在定性和定量结果准确性方面的优缺点。定性研究结果表明，板岩技术是确定物种丰富度最准确的技术。在定量研究中，诸如人工鱼礁周围的物种特征（生态类型），吸引力（鱼类与潜水者之间的关系）和鱼类群落丰富度等因素似乎会影响我们对两种技术进行比较的结果。在13种``永久性''（在超过75％的潜水中观察到）的物种中，有6种通过板岩和视频（Lutjanus kasmira，Lutjanus bengalensis，Priacanthus hamrur，Chaetodon kleinii，Heniochus diphreutes，Mulloides vanicolensis）返回了相似的检测频率;然后选择这些样本，以使用定量数据进行技术比较。视频普查结果与板岩普查结果之间的相关性很高，但与普查结果相比，视频普查低估了丰度，尤其是对于低值普查而言。建议纠正指数以纠正这种低估；它可用于对视频检测反应良好的物种进行视频调查（如下所示）。

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