Organising a juvenile ratio monitoring programme for 10 key waterbird species in the Yangtze River floodplain:analysis and proposals  

作　　者：Yuxi Wang Iderbat Damba Qingshan Zhao Yanbo Xie Xueqing Deng Rdi Ga Guanhua Liu Zhiwen Xu Yue Li Dali Gao Wenbin Xu Guoxun Chen Lei Cao 

机构地区：[1]School of Life Science,University of Science and Technology of China,Hefei 230026,China [2]State Key Laboratory of Urban and Regional Ecology,Research Center for Eco Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China [3]University of Chinese Academy of Sciences,Beijing 100049,China [4]Institute of Biology,Mongolian Academy of Sciences,Ulaanbaatar 13330,Mongolia [5]Department of Modern Physics,University of Science and Technology of China,Hefei 230026,China [6]College of Life Sci-ence and Technology,Inner Mongolia Normal University,Huhehaote 010000,China [7]Jiangxi Poyang Lake National Reserve Authority,Nan Chang 330038,China [8]Authority of Jiangxi Duchang Provincial Natural Reserve,Duchang 332600,China [9]Authority of East Dongting Lake National Nature Reserve,Yueyang 414000,China [10]Anhui Shengjin Lake National Reserve Author-ity,Dongzhi 247000,China [11]Authority of Longgang Lake National Nature Reserve,Huanggang 435500,China

出　　处：《Avian Research》2021年第4期645-657,共13页鸟类学研究（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.31870369,31970433);China Biodiversity Observation Networks(Sino BON);Innovative Research Group Project of the National Natural Science Foundation of China(CN);No.31670424。

摘　　要：Background:In the face of continued degradation and loss of wetlands in the Yangtze River floodplain(YRF),there is an urgent need to monitor the abundance and distribution of wintering waterbirds.To understand fully observed annual changes,we need to monitor demographic rates to understand factors affecting global population size.Annual reproduction success contributes to dynamic changes in population size and age structure,so an assessment of the juvenile ratio(i.e.first winter birds as a proportion of total number aged)of overwintering waterbirds can be an important indicator of the reproductive success in the preceding breeding season.Methods:During 2016-2019,we sampled juvenile ratios among 10 key waterbird species from the wetlands in the YRF.Based on these data,we here attempt to establish a simple,efficient,focused and reliable juvenile ratio monitoring scheme,to assess consistently and accurately relative annual breeding success and its contribution to the age structure among these waterbird species.Results:We compared juvenile ratio data collected throughout the winter and found that the optimal time for undertaking these samples was in the early stages of arrival for migratory waterbirds reaching their wintering area(early to mid-December).We recommend counting consistently at key points(i.e.those where>1%biogeographical flyway population were counted)at sites of major flyway importance(Poyang Lake,East Dongting Lake,Shengjin Lake,Caizi Lake,Longgan Lake and Chen Lake).Based on this,the error rate of the programme(155 planned points,the count of 10 waterbird species is 826-8955)is less than 5%.Conclusions:We established a juvenile ratio monitoring programme for 10 key waterbird species in the wetlands of the YRF,and discuss the feasibility and necessity of implementing such a future programme,and how to use these data in our monitoring and understanding of the population dynamics of these waterbird populations.

关 键 词：Juvenile ratio Monitoring scheme The Yangtze River floodplain Statistical independence 

分 类 号：Q958.8[生物学—动物学]