Shifts in distribution of herbivorous geese relative to hydrological variation in East Dongting Lake wetland, China.
Shifts in distribution of herbivorous geese relative to hydrological variation in East Dongting Lake wetland, China.
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DOI：
10.1016/j.scitotenv.2018.04.247
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发表时间：
2018-09
期刊：
影响因子：
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通讯作者：
Pingyang Zhang;Y. Zou;Yonghong Xie;Hong Zhang;Xiang-Kui Liu;Dali Gao;Feiyue Yi
中科院分区：
文献类型：
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作者：
Pingyang Zhang;Y. Zou;Yonghong Xie;Hong Zhang;Xiang-Kui Liu;Dali Gao;Feiyue Yi
水鸟的分布动态及其与水文变化的关系研究是生态学研究的重要组成部分。东洞庭湖是拉姆萨尔湿地，是沿着东亚-澳大拉西亚迁徙路线上食草鹅类重要的越冬地。本文以年度（2008/09-2016/17）水鸟普查数据，我们调查了三种草食性鹅的时空分布（小白额雁、豆雁和大白额雁）的分布动态进行了分析（以百分比相似性指数PSI表示）。结果表明，全球易危小白额鹅的分布年际间变化明显，而豆雁的分布较为稳定。在研究期间，大白额鹅的分布发生了剧烈的变化。小白额鹅的PSI与退水时间和10月平均水位的年际差异呈显著负相关，而豆鹅的PSI与退水时间和10月平均水位的年际差异无明显趋势。应用归一化植被指数（NDVI）对鹅食物资源的变化进行了检测，并与水文因子进行了相关分析。由此推断，水文情势的变化通过改变食物条件影响了小白额鹅的年内分布动态，而对豆鹅的影响未在本研究中得到体现。物种特征可以解释三种鹅种群分布动态的差异。据推测，小白额鹅可能对栖息地的变化更敏感，而豆鹅更有弹性。提出了水文情势调控是管理工作的关键。本研究可为东洞庭湖湿地生境变化背景下的物种保护提供科学依据，并为该地区的生境管理提供潜在的见解。
Studies on distribution dynamics of waterbirds and the relation with hydrological changes are essential components of ecological researches. East Dongting Lake is a Ramsar site and especially important wintering ground for herbivorous geese along the East Asian-Australasian Flyway. In this paper, based on annual (2008/09–2016/17) waterbird census data, we investigated the spatial-temporal distributions of three herbivorous goose species (Lesser White-fronted GooseAnser erythropus, Bean GooseAnser fabalis, and Greater White-fronted GooseAnser albifrons) within East Dongting Lake, and analyzed their distribution dynamics (denoted by percentage similarity index, PSI) relative to variations in hydrological regime. The results demonstrated that the distribution of the globally vulnerable Lesser White-fronted Geese changed obviously between years, whereas that of Bean Geese was more stable. Greater White-fronted Geese suffered drastic distribution variation during the study period. The PSI of Lesser White-fronted Geese was negatively correlated with between-year difference in water recession time and mean water level in October, whereas no obvious trend was found in Bean Geese. The Normalized Difference Vegetation Index (NDVI) was applied to detect changes in food resources of the geese, and significant correlations were also found between NDVI and hydrological factors. It was inferred that the variations in hydrological regime affected the annual distribution dynamics of Lesser White-fronted Geese by changing food conditions; whereas the effect on Bean Geese were not reflected in this study. Species traits may explain the differences in distribution dynamics among the three goose species. It was speculated that Lesser White-fronted Geese might be more sensitive to habitat change, whereas Bean Geese were more resilient. We suggested that regulating hydrological regime was crucial in management works. Our study could offer scientific information for species conservation in the context of habitat changes in East Dongting Lake wetland and provide potential insights into habitat management in this area.