Reproductive success and offspring survival decline for female elephant seals past prime age

IF 3.5 1区 环境科学与生态学 Q1 ECOLOGY Journal of Animal Ecology Pub Date : 2024-11-19 DOI:10.1111/1365-2656.14226
Allison R. Payne, Max F. Czapanskiy, A. Marm Kilpatrick, Patrick W. Robinson, Cara M. O. Munro, Kelli Ong, Adrien Bastidas, Alegra O. Negrete, Brecken Theders, Bryn Stillwell, Danissa Coffey, Elijah Schweitzer, Elise Baugh, Jasmine Salazar, Keenan Chau-Pech, Mason Rodrigues, Mimi Chavez, Savanna Wright, Sofia Rivas, Joanne Reiter, Daniel P. Costa, Roxanne S. Beltran
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过了壮年期的雌性海象的繁殖成功率和后代存活率都在下降。
母体年龄会影响繁殖成功率和后代的体质,但这些影响的时间、程度和方向还不十分清楚。进化理论预测,生育力衰老的选择强于母体效应衰老,因此母体效应衰老的速度将快于生育力衰老的速度。我们利用对北方象海豹(Mirounga angustirostris)长达 36 年的研究来调查生殖衰老。我们的数据集包括对 1203 只已知年龄雌性北象海豹的 103,746 次观察。我们假设,生育率(母体繁殖成功率)、后代存活率和繁殖种群招募率以及雄性后代产量将随着母体年龄的增长而下降。此外,我们还假设,年长的雌性海豹会缩短换羽时间,以便有更多的时间用于觅食。我们发现了生育能力和母性衰老的证据,但没有证据表明母性衰老会影响后代招募或性别比例。繁殖概率从11岁时的96.4%(95% CI:94.8%-97.5%)下降到19岁时的89.7%(81.9%-94.3%),后代存活概率从11岁时的30.3%(23.6%-38.0%)下降到19岁时的9.1%(3.2%-22.9%)。生育率和母体效应衰老的下降率没有差异。然而,与生育力衰老相比,母体效应衰老对存活到 1 岁的后代数量的影响要大得多。与假设的非衰老种群相比,母体效应衰老导致存活的幼崽数量减少了 5.3%,而繁殖力衰老导致每年生产的幼崽数量仅减少了 0.3%。这些结果与进化理论的预测一致,即母性效应衰老比繁殖力衰老的选择更弱。因此,在某些系统中,母性效应衰老可能比繁殖力衰老对种群动态的影响更大。
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来源期刊
Journal of Animal Ecology
Journal of Animal Ecology 环境科学-动物学
CiteScore
9.10
自引率
4.20%
发文量
188
审稿时长
3 months
期刊介绍: Journal of Animal Ecology publishes the best original research on all aspects of animal ecology, ranging from the molecular to the ecosystem level. These may be field, laboratory and theoretical studies utilising terrestrial, freshwater or marine systems.
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