Underwater towed video: A useful tool to rapidly assess elasmobranch populations in large marine protected areas

被引：17
作者：
Assis J. [1 ]
Narváez K. [1 ]
Haroun R. [1 ]
机构：
[1] Bioges-Centre for Biodiversity and Environmental Management, University of Las Palmas de Gran Canaria, 35017 Las Palmas, Canary Islands
来源：
Journal of Coastal Conservation | 2007年 / 11卷 / 3期
关键词：
Abundance estimation; Elasmobranch; Monitoring methods; Underwater video;
D O I：
10.1007/s11852-008-0015-x
中图分类号：
学科分类号：
摘要：
Elasmobranch stock assessment studies are usually made through fisheries surveys data. However, in large marine protected areas (MPAs) the use of destructive techniques must be dismissed in order to avoid population impacts. In 2005, while conducting a marine habitat survey in two marine Special Areas of Conservation (Sebadales de Playa de Inglés and Franja Marina de Mogán) in south Gran Canary Island (Canary Islands, Spain) with underwater towed video (UTV) and underwater visual census (UVC) transects, we recognized the opportunity rose to assess elasmobranch populations through UTV. Number of observed species and specimens, overall field work effort and total surveyed area were determined and compared between methods. Mean observations per day per unit of time (MOPUT) and mean observations per day per unit of surveyed area (MOPUA) were also compared through Mann-Whitney rank sum statistical test (α=0.05). Data analysis demonstrated that UTV is a very useful tool to rapidly assess elasmobranch populations in large MPAs in good visibility underwater environments. It can assess larger areas than UVC with the same effort (statistically significant difference found for the MOPUT; p=<0.001), leading to more observed species (5 vs 2) and specimens (46 vs 3) per day of work, with no loss in resolution power (MOPUA values were not significantly different between UTV and UVC; p=0.104). © Springer Science + Business Media B.V. 2008.
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收藏
页码：153 / 157
页数：4
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