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No change in Atlantic Yellow-nosed Albatross (Thalassarche chlororhynchos) egg size over 160 years
Emu - Austral Ornithology ( IF 1.3 ) Pub Date : 2020-04-02 , DOI: 10.1080/01584197.2020.1752733
Alexander L. Bond 1, 2 , Gregory T.W. McClelland 2, 3 , Richard J. Cuthbert 2, 4 , Trevor Glass 3 , Julian Repetto 3 , Peter G. Ryan 5
Affiliation  

ABSTRACT Biotic and abiotic conditions in the world’s oceans have changed considerably in the last two centuries as a result of anthropogenic factors, including whaling, sealing, fishing, and climate change. For species that have limited variation in life-history traits, life-history characteristics may impede the ability to adapt to changing environmental conditions. Albatrosses are one such group, where breeding investment is limited to a single egg every one or two years. At a coarse level, individuals may decide whether to breed or not, or whether to incubate an egg or not, but one of the only finer-scale adjustment in parental investment involves altering egg size, along with parental foraging and chick provisioning. We investigated changes in egg size in Atlantic Yellow-nosed Albatrosses (Thalassarche chlororhynchos) breeding at Tristan da Cunha, South Atlantic Ocean, from 1856 to 2015. We found no change in egg length, or breadth, which may suggest that with regards to this life-history parameter, Atlantic Yellow-nosed Albatrosses appear to have been able to buffer the effects of the trophic, climatic and oceanographic changes in the South Atlantic Ocean.

中文翻译:

大西洋黄鼻信天翁(Thalassarche chlororhynchos)蛋大小在 160 年中没有变化

摘要 在过去的两个世纪里,由于捕鲸、捕海豹、捕鱼和气候变化等人为因素,世界海洋中的生物和非生物条件发生了很大变化。对于生活史特征变化有限的物种,生活史特征可能会阻碍适应不断变化的环境条件的能力。信天翁就是这样一个群体,育种投资仅限于每一两年一个鸡蛋。在粗略的层面上,个人可以决定是否繁殖,或者是否孵化一个鸡蛋,但父母投资的唯一更精细的调整之一涉及改变鸡蛋大小,以及父母觅食和雏鸡供应。
更新日期:2020-04-02
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