骚扰对南方白幼生存的影响:长期捕获-重新捕获分析

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Macarena Agrelo^1,2, Carina F Marón^2,3, Fábio G Daura-Jorge¹

¹Laboratório de Mamíferos Aquáticos, Departamento de Ecologia e Zoologia, Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil.

Biology letters

|June 7, 2023

概括

在瓦尔德斯半岛,海藻对南方白 (SRW) 幼的攻击正在增加. 伤的恶化显著降低了SRW小牛的存活率,影响了种群动态.

科学领域:

海洋生物学海洋生物学
野生动物保护野生动物保护
动物行为动物行为

背景情况:

海藻 (Larus dominicanus) 在阿根廷瓦尔德斯半岛的南方公 (SRW,Eubalaena australis) 上表现出食行为.
母和幼对海袭击的反应改变了行为,自20世纪90年代中期以来,伤害的发生率不断增加.
2003年以后小牛死亡率上升表明,海的骚扰可能是其中的一个因素.

研究的目的:

调查海造成的伤害对南方公幼第一年生存的影响.
分析随着时间的推移,伤口严重程度和小牛生存率之间的关系.

主要方法:

利用了1974年至2017年间44次观测的捕获-重新捕获数据.
包括597头南方公,出生年份从1974年到2011年,照片识别.
与第一年生存概率相关的伤害严重程度.

主要成果:

观察到小牛头一年生存率显著下降.
这种生存率的下降与海造成的伤口的严重性随着时间的推移而增加密切相关.
这些发现支持这样一个假设:海骚扰会对SRW小牛产生负面影响.

结论:

瓦尔德斯半岛的海骚扰对南方白幼的生存构成重大威胁.
伤口越来越严重与小牛的生存率下降相关,影响SRW种群动态.
迫切需要采取保护战略,以减轻海捕食对这种脆弱的鱼物种的影响.

关键词:

澳大利亚 (Eubalaena australis) 是一个在海造成的病变.死亡率死亡率人口动态人口动态

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