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海洋鸟在气候变化热点地区的空间,环境和食物区分

Yuri Niella¹, Dustin O'Hara¹, Ian Jonsen¹

¹School of Natural Sciences, Faculty of Science and Engineering, Macquarie University, Sydney, New South Wales, Australia.

The Journal of animal ecology

|January 27, 2025

概括

气候变化加剧了海鸟之间的竞争. 资源分区策略因物种而异,影响食范围和热带水平,尤其是小企.

科学领域:

海洋生态海洋生态学
气候变化生物学
鸟类生态学鸟类生态学

背景情况:

相似物种需要资源分割,以尽量减少在有限的环境中的竞争.
了解气候变化对海洋掠食者资源分割的影响至关重要,但有限.
海鸟的食动态是复杂的,受到环境变化的影响.

研究的目的:

在三种同情的海鸟之间调查空间和食物资源的分割.
检查与环境变化相关的资源分割的年度间变化.
评估东澳大利亚电流 (EAC) 对海鸟食行为和利基重叠的影响.

主要方法:

海鸟移动的GPS跟踪和羽毛组织的稳定同位素分析 (δ15N, δ13C).
应用通用线性混合模型,将海洋学条件与海鸟空间使用联系起来.
利用斯科纳的D和贝叶斯混合模型来量化跨种类的利基重叠.

主要成果:

大和小企避免了温暖的,盐的EAC水域;和银的食面积减少,EAC的影响力增加.
所有海鸟物种都喜欢海面温度变化较低的地区.
小企在高EAC统治期间表现出更大的同位素位空间,而银则保持了广泛,稳定的位.

结论:

在气候变化下,加剧EAC可能会增加物种间的竞争,不成比例地影响像小企这样的受限食范围的物种.
特定物种的生物特征和行为可塑性是预测气候变化对海洋物种影响的关键因素.
有效的保护战略必须考虑个体物种对环境变化的反应和资源的可用性.

关键词:

东澳大利亚电流 (EAC)气候变化气候变化气候变化环境利基环境利基资源划分资源的划分卫星遥测卫星遥测技术海洋鸟类海鸟稳定的同位素分析.这是一个巨额的利基.

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