Hydrology-driven responses of herbivorous geese in relation to changes in food quantity and quality
Hydrology-driven responses of herbivorous geese in relation to changes in food quantity and quality
复制标题
草食鹅的水文驱动响应与食物数量和质量变化的关系
DOI：
10.1002/ece3.6272
复制
发表时间：
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影响因子：
2.6
通讯作者：
Wei Tu
中科院分区：
文献类型：
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作者：
Pingyang Zhang;Yeai Zou;Yonghong Xie;Siqi Zhang;Xinsheng Chen;Feng Li;Zhengmiao Deng;Hong Zhang;Wei Tu
东洞庭湖是拉姆萨尔湿地，也是东亚-澳大拉西亚迁徙路线上食草鹅特别重要的越冬地。三峡大坝的运行改变了水势，对下游湿地生态系统产生了重大影响。研究了2016/2017年和2017/2018年两种同域草食性鹅（Lesser white - fronseanser erythropuss和Bean goose）在早退期和晚退期的食物条件、栖息地选择和饮食组成，研究了它们对栖息地变化的响应。预计不同的水制度会导致不同的食物条件和鹅的反应。结果表明，不同冬季的食物质量和数量差异显著。在2016/2017年期间，作为对高数量/低质量食物的反应，更多的鹅转向以泥滩为食，并利用双子叶和苔藓等植物。carexspp的高大的草地。在第一生长季发育的优势植物会降低第二生长季的食物可得性，阻碍鹅对新梢的利用，我们的剪枝对照试验进一步证实了这一点。几乎所有的鹅都选择在草地和草地上觅食。在2017/2018年，当有更多的低数量/高质量的食物时，它们占了他们饮食的大部分。与全球脆弱的小白额鹅相比，体型较大的豆鹅似乎不太容易受到冬季食物短缺的影响，并表现出更稳定的反应。结果表明，食质-数量条件是影响鹅反应的外部因素，而形态和生理性状可能是造成两种鹅不同反应的内部因素。本研究加深了对三峡大坝运行背景下生境变化对草食性鹅越冬地影响的认识。本文认为，调节水文环境对湿地管理和物种保护具有重要意义。
East Dongting Lake is a Ramsar site and a particularly important wintering ground for herbivorous geese along the East Asian‐Australasian Flyway. The operation of the Three Gorges Dam has changed the water regime and has a significant impact on wetland ecosystems downstream. We studied the responses of two sympatric herbivorous goose species, the Lesser white‐fronted gooseAnser erythropusand Bean gooseAnser fabalis, to habitat change by investigating their food conditions, habitat selection, and diet composition in the wintering periods of 2016/2017 and 2017/2018, which had early and late water recession, respectively. It was expected that the contrasting water regimes would result in different food conditions and geese responses. The results showed that the food quality and quantity differed significantly between winters. As responses to the high‐quantity/low‐quality food during 2016/2017, more geese switched to feeding on mudflat and exploited plants such as dicotyledons and moss. The tall swards ofCarexspp. (dominant plants in the meadow) that developed during the first growing season decreased the food accessibility during the second growing season and hindered the exploitation of newly generated shoots by the geese, which was further confirmed by our clipping control experiment. Nearly all the geese chose to feed on meadow, andCarexspp. made up the majority of their diet in 2017/2018 when there was more low‐quantity/high‐quality food. Compared with the globally vulnerable Lesser white‐fronted geese, the larger‐sized Bean geese seemed to be less susceptible to winter food shortages and exhibited more stable responses. We concluded that the food quality–quantity condition was the external factor influencing the geese responses, while morphological and physiological traits could be the internal factors causing different responses between the two species. This study enhanced the understanding of the influence that habitat change exerts on herbivorous geese in their wintering site in the context of the Three Gorges Dam operation. We suggested that regulating hydrological regime was important in terms of wetland management and species conservation.