性二态性不转化为在秘鲁的乳头 (Sula variegata) 中寻找食物或食用区分
Sara Y Wang1, Carlos Zavalaga2, Diego Gonzales-DelCarpio2
1Department of Oceanography and Coastal Sciences, Louisiana State University, Baton Rouge, Louisiana, United States of America.
PloS one
|March 18, 2025
概括
秘鲁乳头没有表现出基于性别的食差异,即使在具有挑战性的海洋条件下. 它们的饮食保持一致,这表明它们在种内竞争较弱,并且适应于洪堡流系统.
科学领域:
- 生态生态学 生态生态学
- 动物行为 动物行为
- 保护生物学 保护生物学
背景情况:
- 种内竞争可以推动海鸟饮食和食行为中的性隔离.
- 性二态可能促进利基划分,但环境的变化可能会改变这种动态.
- 秘鲁 (Sula variegata) 是一个在变量洪堡电流系统 (HCS) 中的两性两形海鸟.
研究的目的:
- 为了调查秘鲁鱼的食和饮食中的性利基分区.
- 评估环境条件对基于性别的资源使用的影响.
- 了解在可变海洋生态系统中的适应策略.
主要方法:
- 收集了形态测量数据,GPS追踪食旅行,通过吐物进行饮食分析,以及稳定同位素分析.
- 两性之间和两年间不同海洋条件下进行了食和食物的比较.
- 分析了在秘鲁北部瓜纳佩岛繁殖的秘鲁乳头的数据.
主要成果:
- 雌性比雄性更大,状况更好,但没有观察到显著的性别特异性食或同位素区分.
- 安乔维塔 (Engraulis ringens) 是两性的主导猎物,突出了饮食依赖.
- 尽管2016年海洋条件不利,减少了化,但在繁殖个体中没有发生基于性别的利基分区的定性转变.
结论:
- 在研究期间,秘鲁毛表现出弱的物种内部竞争和有限的基于性别的利基分割.
- 秘鲁巨的食策略适应了HCS的环境变化.
- 在研究的条件下,这种物种的性二态性似乎没有推动显著的利基分区.
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