• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Marine ecology progress series >Environmental correlates of relative abundance of potentially dangerous sharks in nearshore areas, southeastern Australia
【24h】

Environmental correlates of relative abundance of potentially dangerous sharks in nearshore areas, southeastern Australia

机译：澳大利亚东南部近岸地区相对危险鲨鱼相对丰富的环境相关因素

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

Human-shark encounters garner a disproportionate amount of public attention. Long-term datasets from shark mitigation programs can help determine the environmental conditions that influence abundance of potentially dangerous sharks. We used 25 yr (1992-2016) of shark catches from the New South Wales (NSW) Shark Meshing Program (SMP) to model the abundance of all potentially dangerous shark species (tiger Galeocerdo cuvier, white Carcharodon carcharias and whaler sharks [genus Carcharhinus]) and individual species/genus to determine: (1) the temporal/spatial variability in catches and (2) the oceanographic and physical variables that could influence abundance. Too few tiger sharks were caught to individually model their abundance. Generalised additive mixed models revealed seasonal and inter-annual abundance trends that differ between white and whaler sharks. Overall, sea surface temperatures (SSTs), years with SSTs colder or warmer than the long-term average, El Nino events, moon illumination, and beach length influenced the abundance of shark groups tested. White shark abundance was highest during water temperatures of similar to 17-18 degrees C and declined when SST increased above 19 degrees C. Whaler abundance increased with higher SSTs. Shark abundance was higher during El Nino events than during La Nina, although the number of whalers caught was highest during neutral phases. All groups showed a decrease in the number of catches with increasing moon illumination and higher abundance on longer beaches. These results may aid public safety methods aimed at reducing human-shark encounters by highlighting when higher numbers of sharks may occur.
机译：鲨鱼遭遇的鲨鱼引起了公众极大的关注。来自鲨鱼缓解计划的长期数据集可以帮助确定影响大量潜在危险鲨鱼的环境条件。我们使用了来自新南威尔士州（NSW）鲨鱼网格划分程序（SMP）的25年（1992-2016）鲨鱼捕捞量来模拟所有潜在危险鲨鱼物种（虎Galeocerdo cuvier，白色Carcharodon carcharias和捕鲸鲨[Carcharhinus属]）和单个物种/属来确定：（1）渔获物的时空变化和（2）可能影响丰度的海洋和物理变量。捕获到的虎鲨数量很少，无法单独模拟它们的数量。广义加性混合模型揭示了白鲨和捕鲸鲨的季节性和年际丰度趋势。总体而言，海表温度（SST），SST比长期平均温度低或高的年份，厄尔尼诺事件，月亮照度和海滩长度影响了所测试鲨鱼种群的数量。在接近17-18摄氏度的水温下，白鲨的丰度最高，而当SST升高到19摄氏度以上时，白鲨的丰度下降。随着SST的升高，捕鲸者的丰度增加。厄尔尼诺事件期间鲨鱼的丰度高于拉尼娜事件期间的鲨鱼数量，尽管在中立阶段捕鲸者的数量最高。所有组均显示，随着月亮照度的增加和较长海滩上丰度的提高，渔获物数量减少。这些结果可能会突出显示何时可能出现更多数量的鲨鱼，从而有助于减少人鲨的公共安全方法。

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