Many species produce individually specific vocalizations and sociality is a hypothesized driver of such individuality. Previous studies of how social variation influenced individuality focused on colonial or non-colon...Many species produce individually specific vocalizations and sociality is a hypothesized driver of such individuality. Previous studies of how social variation influenced individuality focused on colonial or non-colonial avian species, and how so- cial group size influenced individuality in sciurid rodents. Since sociality is an important driver of individuality, we expected that bird species that defend nesting territories in higher density neighborhoods should have more individually-distinctive calls than those that defend nesting territories in lower-density neighborhoods. We used Beecher＇s information statistic to quantify individu- ality, and we examined the relationship between bird density （calculated with point-counts） and vocal individuality on seven spe- cies of passerines. We found non-significant relationships between breeding bird density and vocal individuality whether regres- sions were fitted on species values, or on phylogenetically-independent contrast values. From these results, we infer that while in- dividuality may be explained by social factors, breeding bird density is unlikely to be generally important in driving the evolution of individually-specific vocalizations [Current Zoology 58 （5）： 765-772, 2012].展开更多
Estimating bird abundance is key to assess threats,and to prioritize conservation actions.However,few studies focus on this topic,particularly in developing countries,which may hamper conservation efficiency.We used d...Estimating bird abundance is key to assess threats,and to prioritize conservation actions.However,few studies focus on this topic,particularly in developing countries,which may hamper conservation efficiency.We used data collected from Guangdong Province,China,between 2000 and 2020 to estimate bird abundance using MaxEnt modelling.In total,258 bird species were included,with an average density of 1485.2±489.3 ind./km^(2)(range:242.9-4502.2 ind./km^(2)).The highest density occurred in the Pearl River Estuary and on the Leizhou Peninsula.For forest birds,203 species were included with an average density of 1236.2±424.5 ind./km^(2)(143.7-2373.1 ind./km^(2)),and highest densities were found in the Pearl River Estuary and North River regions.For the 55 species of waterbirds,the average density was 249.0±351.8 ind./km^(2)(0.3-2336.1 ind./km^(2)).The total number of birds in Guangdong was estimated to be 2.58×108 ind.(2.24-3.06×10^(8)),with a total number of forest birds estimated to be 2.15×10^(8)ind.(1.90-2.49×10^(8)).The most abundant forest species(>107 individuals)were:Huet's Fulvetta(Alcippe hueti)with 2.84×10^(7)ind.,(range:2.73-2.95×10~7),Light-vented Bulbul(Pycnonotus sinensis)with 1.13×10^(7)ind.(1.07-1.20×10^(7)),Swinhoe's White-eye(Zosterops simplex)with 1.13×10^(7)ind.(1.09-1.17×10^(7)),and Red-whiskered Bulbul(Pycnonotus jocosus)with 1.01×10^(7)ind.(9.66-10.47×10^(6)),The total number of waterbirds in Guangdong was estimated to be 4.37×10^(7)ind.(3.38-5.75×10^(7)).The most abundant waterbirds(>106 individuals)were Black-headed Gull(Chroicocephalus ridibundus)with 6.35×10^(6)ind.(5.48-7.36×10^(6)),Pied Avocet(Recurvirostra avosetta)with 5.56×10^(6)ind.(3.75-8.24×10^(6)),and Little Egret(Egretta garzetta)with 5.01×10^(6)ind.(4.19-6.00×10^(6)).The densities and abundances of the 41 species listed as threatened in IUCN(higher than NT)or Chinese National Protected lists(higher thanⅡ)were evaluated,of which the population sizes of nine species were estimated for the first time in Guangdong.Moreover,all 41 species'average densities significantly declined from 2012 to 2017 in Nanling National Natural Reserve,Guangdong.展开更多
文摘Many species produce individually specific vocalizations and sociality is a hypothesized driver of such individuality. Previous studies of how social variation influenced individuality focused on colonial or non-colonial avian species, and how so- cial group size influenced individuality in sciurid rodents. Since sociality is an important driver of individuality, we expected that bird species that defend nesting territories in higher density neighborhoods should have more individually-distinctive calls than those that defend nesting territories in lower-density neighborhoods. We used Beecher＇s information statistic to quantify individu- ality, and we examined the relationship between bird density （calculated with point-counts） and vocal individuality on seven spe- cies of passerines. We found non-significant relationships between breeding bird density and vocal individuality whether regres- sions were fitted on species values, or on phylogenetically-independent contrast values. From these results, we infer that while in- dividuality may be explained by social factors, breeding bird density is unlikely to be generally important in driving the evolution of individually-specific vocalizations [Current Zoology 58 （5）： 765-772, 2012].
基金supported by the National Natural Science Foundation of China(31961123003,32001098,31672265)the DFGP project of fauna of Guangdong(202115)the GDAS Special Project of Science and Technology Development(2022GDASZH-2022010106)。
文摘Estimating bird abundance is key to assess threats,and to prioritize conservation actions.However,few studies focus on this topic,particularly in developing countries,which may hamper conservation efficiency.We used data collected from Guangdong Province,China,between 2000 and 2020 to estimate bird abundance using MaxEnt modelling.In total,258 bird species were included,with an average density of 1485.2±489.3 ind./km^(2)(range:242.9-4502.2 ind./km^(2)).The highest density occurred in the Pearl River Estuary and on the Leizhou Peninsula.For forest birds,203 species were included with an average density of 1236.2±424.5 ind./km^(2)(143.7-2373.1 ind./km^(2)),and highest densities were found in the Pearl River Estuary and North River regions.For the 55 species of waterbirds,the average density was 249.0±351.8 ind./km^(2)(0.3-2336.1 ind./km^(2)).The total number of birds in Guangdong was estimated to be 2.58×108 ind.(2.24-3.06×10^(8)),with a total number of forest birds estimated to be 2.15×10^(8)ind.(1.90-2.49×10^(8)).The most abundant forest species(>107 individuals)were:Huet's Fulvetta(Alcippe hueti)with 2.84×10^(7)ind.,(range:2.73-2.95×10~7),Light-vented Bulbul(Pycnonotus sinensis)with 1.13×10^(7)ind.(1.07-1.20×10^(7)),Swinhoe's White-eye(Zosterops simplex)with 1.13×10^(7)ind.(1.09-1.17×10^(7)),and Red-whiskered Bulbul(Pycnonotus jocosus)with 1.01×10^(7)ind.(9.66-10.47×10^(6)),The total number of waterbirds in Guangdong was estimated to be 4.37×10^(7)ind.(3.38-5.75×10^(7)).The most abundant waterbirds(>106 individuals)were Black-headed Gull(Chroicocephalus ridibundus)with 6.35×10^(6)ind.(5.48-7.36×10^(6)),Pied Avocet(Recurvirostra avosetta)with 5.56×10^(6)ind.(3.75-8.24×10^(6)),and Little Egret(Egretta garzetta)with 5.01×10^(6)ind.(4.19-6.00×10^(6)).The densities and abundances of the 41 species listed as threatened in IUCN(higher than NT)or Chinese National Protected lists(higher thanⅡ)were evaluated,of which the population sizes of nine species were estimated for the first time in Guangdong.Moreover,all 41 species'average densities significantly declined from 2012 to 2017 in Nanling National Natural Reserve,Guangdong.
