Ming-Tang Shiao, M. Chuang, Hsiao-Wei Yuan, Ying Wang
{"title":"亚热带山地云林的季节性降雨导致绿背山雀种群的人口波动","authors":"Ming-Tang Shiao, M. Chuang, Hsiao-Wei Yuan, Ying Wang","doi":"10.1093/condor/duaa043","DOIUrl":null,"url":null,"abstract":"ABSTRACT Montane birds are vulnerable to climate change. However, the mechanisms by which weather drives demographic processes in montane birds have seldom been investigated. We conducted a long-term study (2009–2019) on the Green-backed Tit (Parus monticolus), an insectivorous passerine, in the montane cloud forest of subtropical Taiwan. We explored the effects of weather variability on the productivity and survival of adult Green-backed Tits. Nest survival was negatively associated with seasonal rainfall during the breeding season (April–July) and was lower in early clutches than in late clutches. Higher typhoon-induced precipitation during the postbreeding period (July–September) was related to reduced adult survival, but neither summer temperature nor winter weather conditions were found to be related to adult bird survival. We developed a stochastic simulation model for Green-backed Tit population dynamics based on empirical data. We compared the simulated time-series and observed population growth rates (λ) and found that 80% (8/10 yr) of the observed λ fell within the 5th and 95th percentiles of the simulated data over the 10-yr period. Moreover, the simulated average (± standard deviation) of the geometric mean of λ over 10 yr (1.05 ± 0.07) was close to that observed from 2009 to 2019 (0.99), which provided confidence that the model effectively simulated the population growth rate of the Green-backed Tit. We conducted a sensitivity analysis for λ and found that juvenile and adult survival influenced by typhoon-induced rainfall were the greatest contributors to the variance in the growth rate of the Green-backed Tit population. With the onset of intensified seasonal precipitation associated with global warming, the population growth and density of Green-backed Tits will decline substantially. Our results suggest that under scenarios of high emissions of greenhouse gas, this local population of Green-backed Tits will not persist in the near future. LAY SUMMARY Although montane birds are vulnerable to climate change, the effect of weather on their demography has seldom been investigated. We examined the vital rates of the Green-backed Tit in a subtropical montane forest in Taiwan and constructed a model to simulate their population dynamics. We found seasonal precipitation to be the critical factor driving population fluctuations. High rainfall was related to decreased nest survival; typhoon-induced precipitation was associated with decreased adult survival. As seasonal precipitation is expected to intensify under high greenhouse gas emission scenarios, this local population is unlikely to persist in the future. Hence, the species may become a conservation concern.","PeriodicalId":50624,"journal":{"name":"Condor","volume":" ","pages":"1 - 15"},"PeriodicalIF":2.6000,"publicationDate":"2020-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1093/condor/duaa043","citationCount":"1","resultStr":"{\"title\":\"Seasonal rainfall in subtropical montane cloud forests drives demographic fluctuations in a Green-backed Tit population\",\"authors\":\"Ming-Tang Shiao, M. Chuang, Hsiao-Wei Yuan, Ying Wang\",\"doi\":\"10.1093/condor/duaa043\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"ABSTRACT Montane birds are vulnerable to climate change. However, the mechanisms by which weather drives demographic processes in montane birds have seldom been investigated. We conducted a long-term study (2009–2019) on the Green-backed Tit (Parus monticolus), an insectivorous passerine, in the montane cloud forest of subtropical Taiwan. We explored the effects of weather variability on the productivity and survival of adult Green-backed Tits. Nest survival was negatively associated with seasonal rainfall during the breeding season (April–July) and was lower in early clutches than in late clutches. Higher typhoon-induced precipitation during the postbreeding period (July–September) was related to reduced adult survival, but neither summer temperature nor winter weather conditions were found to be related to adult bird survival. We developed a stochastic simulation model for Green-backed Tit population dynamics based on empirical data. We compared the simulated time-series and observed population growth rates (λ) and found that 80% (8/10 yr) of the observed λ fell within the 5th and 95th percentiles of the simulated data over the 10-yr period. Moreover, the simulated average (± standard deviation) of the geometric mean of λ over 10 yr (1.05 ± 0.07) was close to that observed from 2009 to 2019 (0.99), which provided confidence that the model effectively simulated the population growth rate of the Green-backed Tit. We conducted a sensitivity analysis for λ and found that juvenile and adult survival influenced by typhoon-induced rainfall were the greatest contributors to the variance in the growth rate of the Green-backed Tit population. With the onset of intensified seasonal precipitation associated with global warming, the population growth and density of Green-backed Tits will decline substantially. Our results suggest that under scenarios of high emissions of greenhouse gas, this local population of Green-backed Tits will not persist in the near future. LAY SUMMARY Although montane birds are vulnerable to climate change, the effect of weather on their demography has seldom been investigated. We examined the vital rates of the Green-backed Tit in a subtropical montane forest in Taiwan and constructed a model to simulate their population dynamics. We found seasonal precipitation to be the critical factor driving population fluctuations. High rainfall was related to decreased nest survival; typhoon-induced precipitation was associated with decreased adult survival. As seasonal precipitation is expected to intensify under high greenhouse gas emission scenarios, this local population is unlikely to persist in the future. Hence, the species may become a conservation concern.\",\"PeriodicalId\":50624,\"journal\":{\"name\":\"Condor\",\"volume\":\" \",\"pages\":\"1 - 15\"},\"PeriodicalIF\":2.6000,\"publicationDate\":\"2020-09-04\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://sci-hub-pdf.com/10.1093/condor/duaa043\",\"citationCount\":\"1\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Condor\",\"FirstCategoryId\":\"99\",\"ListUrlMain\":\"https://doi.org/10.1093/condor/duaa043\",\"RegionNum\":2,\"RegionCategory\":\"生物学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"ORNITHOLOGY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Condor","FirstCategoryId":"99","ListUrlMain":"https://doi.org/10.1093/condor/duaa043","RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ORNITHOLOGY","Score":null,"Total":0}
Seasonal rainfall in subtropical montane cloud forests drives demographic fluctuations in a Green-backed Tit population
ABSTRACT Montane birds are vulnerable to climate change. However, the mechanisms by which weather drives demographic processes in montane birds have seldom been investigated. We conducted a long-term study (2009–2019) on the Green-backed Tit (Parus monticolus), an insectivorous passerine, in the montane cloud forest of subtropical Taiwan. We explored the effects of weather variability on the productivity and survival of adult Green-backed Tits. Nest survival was negatively associated with seasonal rainfall during the breeding season (April–July) and was lower in early clutches than in late clutches. Higher typhoon-induced precipitation during the postbreeding period (July–September) was related to reduced adult survival, but neither summer temperature nor winter weather conditions were found to be related to adult bird survival. We developed a stochastic simulation model for Green-backed Tit population dynamics based on empirical data. We compared the simulated time-series and observed population growth rates (λ) and found that 80% (8/10 yr) of the observed λ fell within the 5th and 95th percentiles of the simulated data over the 10-yr period. Moreover, the simulated average (± standard deviation) of the geometric mean of λ over 10 yr (1.05 ± 0.07) was close to that observed from 2009 to 2019 (0.99), which provided confidence that the model effectively simulated the population growth rate of the Green-backed Tit. We conducted a sensitivity analysis for λ and found that juvenile and adult survival influenced by typhoon-induced rainfall were the greatest contributors to the variance in the growth rate of the Green-backed Tit population. With the onset of intensified seasonal precipitation associated with global warming, the population growth and density of Green-backed Tits will decline substantially. Our results suggest that under scenarios of high emissions of greenhouse gas, this local population of Green-backed Tits will not persist in the near future. LAY SUMMARY Although montane birds are vulnerable to climate change, the effect of weather on their demography has seldom been investigated. We examined the vital rates of the Green-backed Tit in a subtropical montane forest in Taiwan and constructed a model to simulate their population dynamics. We found seasonal precipitation to be the critical factor driving population fluctuations. High rainfall was related to decreased nest survival; typhoon-induced precipitation was associated with decreased adult survival. As seasonal precipitation is expected to intensify under high greenhouse gas emission scenarios, this local population is unlikely to persist in the future. Hence, the species may become a conservation concern.
期刊介绍:
The Condor is the official publication of the Cooper Ornithological Society, a non-profit organization of over 2,000 professional and amateur ornithologists and one of the largest ornithological societies in the world. A quarterly international journal that publishes original research from all fields of avian biology, The Condor has been a highly respected forum in ornithology for more than 100 years. The journal is one of the top ranked ornithology publications. Types of paper published include feature articles (longer manuscripts) Short Communications (generally shorter papers or papers that deal with one primary finding), Commentaries (brief papers that comment on articles published previously in The Condor), and Book Reviews.