Underwater behaviour of green turtles monitored with video-time-depth recorders: whats missing from dive profiles?
Underwater behaviour of green turtles monitored with video-time-depth recorders: whats missing from dive profiles?
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用视频时间深度记录仪监测绿海龟的水下行为：潜水资料中缺少什么？
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
GJ Marshall
中科院分区：
文献类型：
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作者：
JA Seminoff;T. Jones;GJ Marshall
在墨西哥加州湾的一个沿海觅食区，我们使用了一个安装在海龟上的视频和数据记录系统（Crittercam;美国国家地理学会）来研究绿色海龟（Chelonia mydas）的水下行为和潜水模式。在1997年8月至2002年6月期间，对34只绿色海龟进行了36次部署，这些海龟的直体长为64.1至96.7厘米，体重为38.6至120.5公斤。共记录了89.5小时的视频和相应的潜水数据（共1065次潜水）。觅食期间观察到8个部署（28个事件）在3.0至32.0米的深度和发生时，海龟游泳在中层水柱和固定在海底; 4海藻和5无脊椎动物的猎物物种进行了鉴定。在9次部署（33次潜水）中，海龟在7.0至26.5米深的海底设置时，观察到了休息行为。总的来说，观察到6种潜水类型，并标记为1型至6型潜水。绿色海龟在1型、3型和5型潜水中觅食，而它们只在1型潜水中休息。除了阐明特定栖息地和资源在浅海觅食区的重要性外，我们的研究结果还证实，一个特定的潜水剖面可以反映出各种各样的水下行为。这些数据表明，在仅根据潜水剖面的外观确定水中活动时应谨慎行事。
We used a turtle-mounted video and data-logging system (Crittercam; National Geo- graphic Society, USA) to study underwater behaviour and dive patterns of green turtles, Chelonia mydas, at a coastal foraging area in the Gulf of California, Mexico. Between August 1997 and June 2002, units were deployed 36 times on 34 green turtles ranging from 64.1 to 96.7 cm in straight cara- pace length and 38.6 to 120.5 kg in weight. A total of 89.5 h of video was recorded with correspond- ing dive data (1065 total dives). Foraging was observed during 8 deployments (28 events) at depths of 3.0 to 32.0 m and occurred while turtles were swimming in the midwater column and stationary on the seafloor; 4 marine algae and 5 invertebrate prey species were identified. Resting behaviour was seen during 9 deployments (33 dives) as turtles set on the seafloor at depths of 7.0 to 26.5 m. Overall, 6 dive types were observed and labeled Type 1 to Type 6 dives. Green turtles foraged during Type 1, Type 3, and Type 5 dives, whereas they rested only during Type 1 dives. In addition to elucidating the importance of specific habitats and resources in neritic foraging areas, our results confirm that a vari- ety of underwater behaviours can be reflected by 1 specific dive profile. These data indicate caution should be exercised when ascertaining in-water activity solely based on the appearance of dive profiles.