Changes and consistencies in marine and coastal bird numbers on Kidney Island (Falkland Islands) over half a century
Changes and consistencies in marine and coastal bird numbers on Kidney Island (Falkland Islands) over half a century
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半个世纪以来肾岛(福克兰群岛)海洋和沿海鸟类数量的变化和一致性
DOI:
10.1007/s00300-019-02587-0
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发表时间:
2019
期刊:
影响因子:
1.7
通讯作者:
Catry P
中科院分区:
文献类型:
--
作者:
Catry P
Detecting change is necessary for effective ecosystem management, yet temporal data on key ecosystem components are lacking for many polar and subpolar regions. For example, although the Falkland Islands hosts internationally important marine and coastal bird populations, few of these were surveyed until the late twentieth century. The avifauna of one small island, Kidney Island, was surveyed between 1958 and 1963, however. This typical tussac-covered island has remained free of non-native predators, so changes in its avifauna may reflect variation in the wider marine environment. In order to obtain a rare snapshot of such changes, we re-surveyed Kidney Island’s avifauna between 2017 and 2019, counting either individuals, breeding pairs or nest sites of marine and coastal waterbirds. Waterfowl, waders and cormorant populations were broadly stable, but several populations showed profound differences over the six decades between surveys. In particular, Southern Rockhopper penguinsEudyptes chrysocomecollapsed from > 3000 to 200 pairs, while Sooty ShearwatersArdenna griseaexpanded by two orders of magnitude. Due to its isolation and tight fisheries management, the Falklands marine environment is assumed to be relatively pristine. Our limited results suggest that sufficient changes may nevertheless have occurred in the region’s marine ecosystem to have detectable impacts on breeding seabirds.
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