北极熊的出现后的时期:表象学和对幼生存的影响
Erik M Andersen1, Ryan R Wilson1, Karyn D Rode2
1U.S. Fish and Wildlife Service, Marine Mammals Management, 1011 E. Tudor Road, Anchorage, AK 99502, United States.
Journal of mammalogy
|May 30, 2024
概括
北极熊母亲在出现后留在巢穴中,以提高幼的生存率. 较长的出现后期显著增加了子生存率,有助于保护这一脆弱物种的保护工作.
科学领域:
- 北极生态学 北极生态学
- 野生动物保护 野生动物保护
- 哺乳动物繁殖 哺乳动物繁殖
背景情况:
- 繁殖的北极熊 (Ursus maritimus) 在化期间禁食超过8个月,耗尽能量储备.
- 从巢穴的出现与增加的猎物可用性相吻合,但熊延迟狩猎,这表明出现后的关键时期.
- 这种后出现期的时间和持续时间对幼生存的影响仍然未被评估.
研究的目的:
- 为了估计北极熊的出现后期的现象学.
- 评估影响出现后期持续时间的因素.
- 评估后出现时间对早春幼存活率的影响.
主要方法:
- 利用了来自南波福特海和楚克奇海的70只领型北极熊的温度和位置数据.
- 预计出现后期的现象学和持续时间.
- 与子生存率相关的出现后持续时间.
主要成果:
- 平均出现在3月16日,在3月24日左右离开;日期因地区和基板 (海冰与陆地) 而异.
- 春季晚些时候观察到的母婴的出现后持续时间明显更长 (7.9天),与没有 (1.9天) 的母婴相比.
- 子生存率从0.5增加到0.9,因为出现后的持续时间延长了大约4天.
结论:
- 出现后的时期对于北极熊的繁殖成功和幼的生存至关重要.
- 这些发现支持进一步研究的必要性,以证实后出现的持续时间和幼的存活率之间的关系.
- 结果可以为北极熊居住区的保护策略提供信息,因为北极人类活动不断扩大.
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