nature

当前位置: Nature » 动物学 » 正文

Nat Com:受气候异常影响的帝企鹅

摘要 : 自然出版集团旗下期刊《Nature Communications》上一项研究发现,大规模气候异常会对帝企鹅的觅食行为和种群动态产生直接影响。

 自然出版集团旗下期刊《Nature Communications》上一项研究发现,大规模气候异常会对帝企鹅的觅食行为和种群动态产生直接影响。了解海洋顶级捕食者种群怎样对气候突然改变做出反应,可帮助预测它们会怎样受未来全球变化的影响。

如厄尔尼诺-南方涛动等气候异常已知会影响生态食物链,而在南印度洋和大西洋,海洋表面温度的不规则波动会造成“偶极子事件”,在其中两个大规模的冷热水体会相遇。然而,我们不知道海洋表面温度的这种变化会怎样影响“南极极锋”(热水域和冷水域之间具有浮游生物和鱼类的大量生物质的一个主要环境边界)上的生态过程。

Charles André Bost及同事在为期16年的一段时间内对南印度洋中带有卫星转发器的帝企鹅的觅食行程进行了追踪。他们发现,海洋表面温度在异常气候驱动下每升高1°C,会将“南极极锋”的最南边移动大约130公里,从而实质性地增加企鹅远离它们在亚南极Crozet群岛的繁殖栖息地去觅食的迁徙距离。

在一个极端气候年份,“南极极锋”的强烈向南移动使得企鹅觅食行程的平均距离增加了一倍,这与该群岛上第二年的繁殖种群数量34%的下降巧合。根据未来气候情景可以预测,“南极极锋”可能会向南进一步移动,从而对该地区的潜水捕食者的持续存在构成潜在严重的威胁。

原文链接:

Large-scale climatic anomalies affect marine predator foraging behaviour and demography

原文摘要:

Determining the links between the behavioural and population responses of wild species to environmental variations is critical for understanding the impact of climate variability on ecosystems. Using long-term data sets, we show how large-scale climatic anomalies in the Southern Hemisphere affect the foraging behaviour and population dynamics of a key marine predator, the king penguin. When large-scale subtropical dipole events occur simultaneously in both subtropical Southern Indian and Atlantic Oceans, they generate tropical anomalies that shift the foraging zone southward. Consequently the distances that penguins foraged from the colony and their feeding depths increased and the population size decreased. This represents an example of a robust and fast impact of large-scale climatic anomalies affecting a marine predator through changes in its at-sea behaviour and demography, despite lack of information on prey availability. Our results highlight a possible behavioural mechanism through which climate variability may affect population processes.

来源: Nature Communications 浏览次数:0

热门文章TOP

RSS订阅 - 填写您的邮件地址,订阅我们的精彩内容: - 网站地图
网站联系电话:020-87540820 备案号:粤ICP备11050685号-8 增值电信业务经营许可证:粤B2-20120479
©2011-2015 生物帮 All rights reserved.