Centre for Sustainable Tropical Fisheries and Aquaculture; College of Science and Engineering, James Cook University, Townsville, Queensland, Australia.
AIMS@JCU, DB17-063, James Cook University, Townsville, Queensland, Australia.
PLoS One. 2020 Dec 17;15(12):e0244154. doi: 10.1371/journal.pone.0244154. eCollection 2020.
Baited remote underwater video stations (BRUVS) are increasingly being used to evaluate and monitor reef communities. Many BRUVS studies compare multiple sites sampled at single time points that may differ from the sampling time of another site. As BRUVS use grows in its application to provide data relevant to sustainable management, marine protected area success, and overall reef health, understanding repeatability of sampling results is vital. We examined the repeatability of BRUVS results for the elasmobranch community both within and between seasons and years, and explored environmental factors affecting abundances at two sites in Indonesia. On 956 BRUVS, 1139 elasmobranchs (69% rays, 31% sharks) were observed. We found consistent results in species composition and abundances within a season and across years. However, elasmobranch abundances were significantly higher in the wet season. The elasmobranch community was significantly different between the two sites sampled, one site being more coastal and easily accessed by fishermen. Our results demonstrate that while BRUVS are a reliable and repeatable method for surveying elasmobranchs, care must be taken in the timing of sampling between different regions to ensure that any differences observed are due to inherent differences amongst sampling areas as opposed to seasonal dissimilarities.
带饵远程水下视频监测站（BRUVS）越来越多地被用于评估和监测珊瑚礁群落。许多 BRUVS 研究比较了在单个时间点采样的多个地点，这些地点可能与另一个地点的采样时间不同。随着 BRUVS 在提供与可持续管理、海洋保护区成功和整体珊瑚礁健康相关的数据方面的应用不断增加，了解采样结果的可重复性至关重要。我们研究了 BRUVS 在印度尼西亚两个地点的季节内和季节间对软骨鱼类群落的重复采样结果，并探讨了影响丰度的环境因素。在 956 个 BRUVS 中，观察到 1139 条软骨鱼类（69%为鳐鱼，31%为鲨鱼）。我们发现，在一个季节内和多年间，物种组成和丰度的结果一致。然而，软骨鱼类的丰度在雨季显著更高。两个采样点的软骨鱼类群落存在显著差异，一个采样点更靠近海岸，渔民更容易到达。我们的研究结果表明，虽然 BRUVS 是一种可靠且可重复的软骨鱼类调查方法，但在不同地区之间进行采样时必须谨慎，以确保观察到的任何差异是由于采样区域的固有差异，而不是季节性差异。
