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Temporal patterns of three sympatric pheasant species in the nanling mountains: N-mixture modeling applied to detect abundance

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Avian Research 2019年第4期10卷 405-414页

作者： Fasheng Zou Qiang Zhang Min Zhang Myung‑Bok Lee Xincai Wang Yuening Gong Changteng Yang Guangdong Key Laboratory of Animal Conservation and Resource Utilization Guangdong Public Laboratory of Wild Animal Conservation and UtilizationGuangdong Institute of Applied Biological ResourcesGuangzhou 510260China Guangdong nanling National Nature Reserve Ruyuan 512727China

Background:The reliability of long-term population estimates is crucial for conservation and management *** previous studies assume that count indices are proportionally related to abundance;however,this assumption may not hold when detection varies spatially and *** examined seasonal variations in abundance of three bird species(Cabot’s Tragopan Tragopan caboti,Silver Pheasant Lophura nycthemera,and Whitenecklaced Partridge Arborophila gingica) along an elevational gradient,using N-mixture models that take into account imperfect detection in our bird ***:Camera-trapping was used to monitor temporal activity patterns of these species at Guangdong nanling National Nature Reserve from December 2013 to November 2017(4 seasons per year).For abundance analysis(N-mixture modeling),we divided a year into 4 seasons,i.e.3 months per season,and performed the analysis by *** was incorporated into the N-mixture model as a covariate that may affect *** compared the N-mixture model with a null model(no covariate model) and selected the better model based on AIC values to make an ***:From 24 sampling sites,we obtained 6786 photographs of 8482 individuals of 44 bird species and 26 mammal *** Pheasant was photographed much more frequently and showed higher temporal activity frequency than White-necklaced Partridge or Cabot’s *** Pheasant was camera-captured most frequently in summer,and other two species in *** three species had two daytime activity peaks:between 6:00 *** 10:00 a.m.,and between 5:00 *** 7:00 p.m.,*** estimated abundance and detection probability from the N-mixture model were variable by *** particular,all three species showed greater abundance in summer than in winter,and estimated abundance patterns of all three species were more similar with observed cameratrapping counts in ***,in winter,elevation had a positive impact on abundan

关键词： Abundance estimation Camera-trapping Imperfect detectability nanling mountains Spatio-temporal distribution Sympatric distribution

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Variation in δ^(15)N of a lacustrine sedimentary sequence in the nanling mountains and its potential implication for climatic conditions over the past ~16000 years

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Chinese Journal of Oceanology and Limnology 2013年第5期31卷 1098-1106页

作者：钟巍曹家元薛积彬欧阳军 School of Geographic Sciences South China Normal University

Although extensive studies have been performed on nitrogen isotopes in lake sediments, understanding the complexity of the δ15N variation related to past environmental and climatic conditions still remains unclear. Supported by multi-proxy records including litho-units, organic carbon isotopes, ration of total organic carbon and total nitrogen, organic matter content, bulk dry density, the accumulation rate of organic matter, median grain size, magnetic susceptibility, and Rb/Sr and Ca/Mg ratios obtained from a sedimentary sequence in a small lake （i.e., Dahu Swamp） in the eastern nanling mountains in South China, we deduce that variation in the δ15N values results primarily from the sources of organic matter, which are significantly influenced by climatic conditions over the past -16 000 years. A low （or high） lake level resulting from dry （or wet） conditions would lead to more （or fewer） vascular plant remains in the sediments and stronger （or weaker） denitrification associated with hypolimnetic anoxia, resulting in lower （or higher） 615N values. In addition, dry （or wet） conditions would favor weakened （or strengthened） biogeochemical activity in the catchment, which could result in less （or more） external input of δ15N-enriched OM, thus leading to decreased （or increased） δ15N values. Our results indicate that the lake sediment δ15N record in the nanling mountains has the potential to provide valuable insight into past East Asian monsoon climate- driven environmental changes.

关键词： nitrogen isotopes lacustrine sediments climate changes nanling mountains

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