Late Holocene colonisation of snow petrels (Pagodroma nivea) of the Prince Charles Mountains, Antarctica
Late Holocene colonisation of snow petrels (Pagodroma nivea) of the Prince Charles Mountains, Antarctica
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DOI：
10.1007/s00300-019-02509-0
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发表时间：
2019-06-01
期刊：
影响因子：
1.7
通讯作者：
Emmerson, Louise
中科院分区：
文献类型：
--
作者：
Berg, Sonja;White, Duanne A.;Emmerson, Louise
由于缺乏直接观测数据以外的记录，很难评估长期环境变化对海鸟种群繁殖和觅食栖息地变化的影响。有关雪燕Pagodroma nivea(Forster)繁殖群体过去分布的信息可以从它们的腺胃油沉积中获得，即所谓的南极mumiyo。在我们的研究中，我们给出了南极东部查尔斯王子山脉北部和南部的Mumiyo沉积的C-14年龄，以重建这些内陆繁殖地雪燕的占领时间。C-14年龄表明，雪燕的最小占领年龄为3680calyear BP。这种殖民活动比当地和地区性冰盖消融早了几千年。这要么表明内陆地点的可及性有限，要么表明在中全新世之前缺乏合适的筑巢地点和/或海洋栖息地的变化影响了进入觅食地的机会。普里兹湾以东的维斯特福尔德和拉斯曼丘陵中的木米尤沉积的C-14年龄表明，从中全新世开始，雪燕的扩散是区域性的。这表明，觅食栖息地的环境变化最有可能是将雪燕的繁殖地点扩展到普里兹湾地区更内陆的无冰地区的最有可能的驱动因素。
The effect of long-term environmental changes on sea bird populations with respect to changes in their breeding and foraging habitats is difficult to assess due to the scarcity of records that go beyond direct observational data. Information on the past distribution of snow petrel Pagodroma nivea (Forster) breeding colonies can be obtained from deposits of their proventricular stomach oil, so-called Antarctic mumiyo. In our study, we present C-14 ages of mumiyo deposits from northern and southern Prince Charles Mountains, East Antarctica, to reconstruct the timing of snow petrel occupation at these inland breeding localities. C-14 ages indicate a minimum age of snow petrel occupation of 3680calyear bp. The colonisation post-dates the de-glacial local and regional ice sheet retreat by several thousand years. This either suggests limited accessibility of the inland sites or a lack of suitable nesting locations prior to the Mid-Holocene and/or changes in the marine habitat affecting access to the foraging grounds. C-14 ages of mumiyo deposits from Vestfold and Larsemann Hills to the east of Prydz Bay point to a regional pattern of snow petrel dispersal starting in the Mid-Holocene. This suggests environmental changes in the foraging habitat to be the most likely drivers for extending breeding site locations of snow petrels to more inland ice-free areas in the Prydz Bay Region.