...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Wildlife Biology >Abundance, survival and population growth of killer whales Orcinus orca at subantarctic Marion Island
【24h】

Abundance, survival and population growth of killer whales Orcinus orca at subantarctic Marion Island

机译：杀手鲸鱼鲸属Orcinus Orca在小提治国岛的丰富，存活率和人口生长

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Killer whales, Orcinus orca, are a cosmopolitan species with large ecological and demographic variation across populations. Population-specific demographic studies are, therefore, crucial in accurately assessing the status and trends of local killer whale populations. Such studies require long-term datasets and remain scarce, particularly in the Southern Ocean where detailed population specific studies have only been conducted at a single archipelago – ?les Crozet. Here, we analysed 12 years of capture–recapture data (comprising nearly 90 000 identification photographs taken from 2006 to 2018) of killer whales at subantarctic Marion Island (46°54′S, 37°45′E) to estimate the abundance, survival and growth rate of this population. Demographic parameters were estimated using multistate capture recapture models, and Pradel Survival-Lambda and POPAN single-state models implemented in the program MARK. Annual survival probability (0.98 [95% CI: 0.96–0.99]) was constant over time, and no important differences between sexes and age-classes (calves, juveniles, adults) were found. This estimate of survival suggests a life expectancy of approximately 48 years. Realised mean population growth rate (λ) was 1.012 (0.987–1.037) with an estimated population size of 54 (54–60) individuals and a mean calving rate of 0.13 (0.06–0.20) calves born per year per reproductive female. The survival and reproduction rates of killer whales at Marion Island are similar to those of killer whale populations in the eastern North Pacific, Norway and ?les Crozet. However, subtle differences in survival and reproduction rates are present. These are likely the result of local differences in resource abundances, historical impacts on social structure and/or stressors. Also, the presence and scale of fisheries (legal and illegal) in the area may provide opportunities for direct interactions with fishing activities impacting survival and reproduction rates.
机译：杀手鲸鱼，Orcinus Orca是一种在群体中具有大量生态和人口统计变异的大都会物种。因此，特定于人口的人口统计学研究是至关重要的，准确评估当地杀伤鲸鲸种群的地位和趋势。这些研究需要长期的数据集，并且仍然稀缺，特别是在南洋海洋中，详细种群特异性研究只在单一的群岛 - ？les rozet中进行。在这里，我们分析了12年的捕获重新捕获数据（包括从下肢马里昂岛（46°54,37°45'e）的杀手鲸，从2006年到2018年拍摄了近90 000张识别照片），以估算丰度，生存和这个人口的增长率。使用多态捕获重新捕获模型估计人口统计参数，以及在程序标记中实现的Pradel Survival-Lambda和Popan单态模型。每年存活概率（0.98 [95％CI：0.96-0.99]随着时间的推移是恒定的，并且发现性别和年龄课程（犊牛，青少年，成人）之间没有重要差异。这种生存的估计表明预期寿命约为48年。实现平均种群生长速率（λ）为1.012（0.987-1.037），估计人口大小为54（54-60）个体，平均产犊率为0.13（0.06-0.20）犊牛，每年每年生育女性出生。 Marion岛的杀手鲸的存活率和繁殖率类似于北北太平洋，挪威的杀手鲸群人和？Les Crozet。然而，存在生存和繁殖率的微妙差异。这些可能是资源丰富的局部差异，对社会结构和/或压力源的历史影响的结果。此外，该地区的渔业（法律和非法）的存在和规模可能为影响生存和繁殖率的捕捞活动进行直接相互作用的机会。

著录项

相似文献

  • 外文文献
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