Rapid growth of the Bar-headed Goose Anser indicus wintering population in Tibet, China: 1991–2017
| Autor: | Fawen Qian, Le Yang, Guo-Gang Zhang, Fengshan Li, Mary Anne Bishop, Drolma Tsamchu, Dong-Ping Liu |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
0106 biological sciences
education.field_of_study 010504 meteorology & atmospheric sciences Ecology biology Population Zoology Anser indicus biology.organism_classification 010603 evolutionary biology 01 natural sciences Geography Goose biology.animal Animal Science and Zoology China education 0105 earth and related environmental sciences Nature and Landscape Conservation |
| Zdroj: | Bird Conservation International. :1-16 |
| ISSN: | 1474-0001 0959-2709 |
| DOI: | 10.1017/s0959270921000265 |
| Popis: | Summary Four of China’s six wintering populations of “grey” geese Anser spp. declined during the last decade. In contrast, the Bar-headed Goose A. indicus wintering population in China’s Tibet Autonomous Region more than doubled. During six surveys in Tibet over a 27-year period (1991/92 to 2017/18 winters) we documented an annual growth rate of 6.8% in the Bar-headed Goose population – an increase from approximately 10,100 to 68,100 birds. We propose that in addition to the cessation of hunting, the population growth of Bar-headed Goose is being driven by changes in agricultural land use patterns in Tibet, the establishment of protected areas on the wintering and breeding grounds, and the impacts of climate change across the Tibetan Plateau. Consistent with this hypothesis, the sown area of winter wheat in Tibet has increased and geese have shifted from primarily feeding in crop stubble to planted winter wheat fields. We also found that the most rapid population growth coincided with a 1998 climate regime shift across the Tibetan Plateau resulting in warmer temperatures, an increase in net precipitation, the appearance of new lakes and changes in the water levels and surface area of historical lakes. We suggest that warmer temperatures and high-quality forage on the south-central Tibet wintering grounds may be enhancing over-winter survival, while on the breeding grounds the expansion of lakes and wet meadows is augmenting breeding and brood-rearing habitat. |
| Databáze: | OpenAIRE |
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