• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>ICES Journal of Marine Science >Surfacing and vertical behaviour of Atlantic bluefin tuna (Thunnus thynnus) in the Mediterranean Sea: implications for aerial surveys
【24h】

Surfacing and vertical behaviour of Atlantic bluefin tuna (Thunnus thynnus) in the Mediterranean Sea: implications for aerial surveys

机译：地中海大西洋蓝鳍金枪鱼（Thunnus Thynnus）的表面和垂直行为：空中调查的影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Atlantic bluefin tuna (Thunnus thynnus) (ABFT) frequently engage in surface basking and foraging behaviour that makes them detectable from afar. This behaviour is utilized for the development of fisheries-independent abundance indices based on aerial surveys, although changes in the surface-feeding dynamics of ABFT are not yet accounted for. We investigated the daytime surfacing behaviour of ABFT at different temporal and vertical resolutions based on 24 individuals (117-158 cm fork length), tagged with pop-up archival tags in the Gulf of Lion, NW-Mediterranean Sea between 2015 and 2016. The results suggest that ABFT remain usually 2 min continuously within the visible surface (0-1 m) during daytime. ABFT presence in the 0-1 and 0-20 m layers varied over time and between individuals but showed a seasonal decline towards autumn with the breakdown of thermal stratification. Furthermore, the rate of surfacing events was highly correlated with the time spent in the 0-20 m layer. Geolocation estimates confirm a strong site fidelity of ABFT during the aerial survey period (August-October) in the Gulf of Lion. Our results support the choice of the survey region and period, but related indices should account for the seasonality of ABFT surface behaviour [i.e. the time spent in the 0-20 m layer.
机译：大西洋蓝鳍金枪鱼（Thunnus Thynnus）（ABFT）经常从事表面晒太阳，觅食行为，使其能够从远处检测到。这种行为用于基于空中调查的渔业独立丰富指数的开发，尽管ABFT的表面喂养动态的变化尚未计算。我们根据24个个人（117-158厘米的叉长）在不同的时间和垂直分辨率下调查了ABFT的白天浮出水行为，标记在2015年和2016年之间的狮子湾的弹出档案标记标记。该结果表明，白天在可见表面（0-1M）内仍然在持续<2分钟。 Abft在0-1和0-20米的层中随着时间的推移和个人之间的变化而变化，但在秋季显示出季节性下降，随着热分层的分解。此外，表面事件的速率与0-20米层中花费的时间高度相关。地理位置估计在狮子湾（八月至十月）在狮子湾的空中调查期间，确认了ABFT的强大网站保真度。我们的业绩支持调查区域和期间的选择，但相关指标应占ABFT表面行为的季节性[即在0-20米层中花费的时间。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号