We used sequences of mitochondrial control region （807bp） in 75 samples from three breeding colonies and one wintering population to investigate the genetic diversity and population structure of Marsh Grassbird （Lo...We used sequences of mitochondrial control region （807bp） in 75 samples from three breeding colonies and one wintering population to investigate the genetic diversity and population structure of Marsh Grassbird （Locustella pryeri sinensis） in different regions of China. Marsh Grassbird retained a moderate amount of haplotype （0.759 ± 0.056） and nucleotide diversity （0.002）. The results of FST among 3 phy-logeographic units and ФST between breeding and wintering sites revealed little evidence of genetic distinction between different colonies. Neither UPGMA tree structure analysis nor Network picture analysis showed obvious divergence between populations at different locations. Analysis of molecular variance also showed a lack of regional subdivision within Locustella pryeri sinesis, 98.5% of source of variation within populations and only 1.5% among populations. The neutrality test showed negative Fu’s FS value, which, in combination with detection of the mismatch distribution, suggested that population expansion occurred in the evolu-tionary history of this species. This hypothesis was further supported by Tajima’s D test and Fu’s test （D = -1.80, p = 0.02; Fs = -22.11, p = 0.001）, this expansion was estimated to occur about 28,700 years ago.展开更多
Endemic to eastern Asia, the Japanese marsh warbler Megalurus pryeri is classified as “vulnerable” in the IUCN Red Data List. Very little information is available concerning the breeding biology of this species. Fro...Endemic to eastern Asia, the Japanese marsh warbler Megalurus pryeri is classified as “vulnerable” in the IUCN Red Data List. Very little information is available concerning the breeding biology of this species. From April to July 2004, we studied the breeding ecology of M.pryeri sinensis in Zhalong Nature Reserve, in northeastern China. The breeding season extended from late May until early August, with a peak in mid-June. Nest building and care of the young was undertaken primarily by females. Males defended their nesting territories, and drove away male intruders. The eggs of the Japanese marsh warbler are white, with tiny fawn spots (greatest diameter=16.88±0.86 mm,n=14); shortest diameter=12.76±0.51 mm,n=14). Clutch size averaged 5.4±1.2 (range 4-7 eggs, n=38 clutches). Incubation lasted for 10-13 days (Mean=11.9±0.8 days, n=18), with a hatching success of 59.9%. The nestling period (range 9-12 days, Mean 10.1±0.9 days, n=15) resulting in a fledgling success rate of 67.5%. Total breeding success was 41.4%. The main cause of nesting failure include human disturbance (cutting reeds), predation, and effects of grazing and flooding.展开更多
基金supported by National Natural Science Foundation of China (No. 130370221 and No. 30770309)
文摘We used sequences of mitochondrial control region （807bp） in 75 samples from three breeding colonies and one wintering population to investigate the genetic diversity and population structure of Marsh Grassbird （Locustella pryeri sinensis） in different regions of China. Marsh Grassbird retained a moderate amount of haplotype （0.759 ± 0.056） and nucleotide diversity （0.002）. The results of FST among 3 phy-logeographic units and ФST between breeding and wintering sites revealed little evidence of genetic distinction between different colonies. Neither UPGMA tree structure analysis nor Network picture analysis showed obvious divergence between populations at different locations. Analysis of molecular variance also showed a lack of regional subdivision within Locustella pryeri sinesis, 98.5% of source of variation within populations and only 1.5% among populations. The neutrality test showed negative Fu’s FS value, which, in combination with detection of the mismatch distribution, suggested that population expansion occurred in the evolu-tionary history of this species. This hypothesis was further supported by Tajima’s D test and Fu’s test （D = -1.80, p = 0.02; Fs = -22.11, p = 0.001）, this expansion was estimated to occur about 28,700 years ago.
文摘Endemic to eastern Asia, the Japanese marsh warbler Megalurus pryeri is classified as “vulnerable” in the IUCN Red Data List. Very little information is available concerning the breeding biology of this species. From April to July 2004, we studied the breeding ecology of M.pryeri sinensis in Zhalong Nature Reserve, in northeastern China. The breeding season extended from late May until early August, with a peak in mid-June. Nest building and care of the young was undertaken primarily by females. Males defended their nesting territories, and drove away male intruders. The eggs of the Japanese marsh warbler are white, with tiny fawn spots (greatest diameter=16.88±0.86 mm,n=14); shortest diameter=12.76±0.51 mm,n=14). Clutch size averaged 5.4±1.2 (range 4-7 eggs, n=38 clutches). Incubation lasted for 10-13 days (Mean=11.9±0.8 days, n=18), with a hatching success of 59.9%. The nestling period (range 9-12 days, Mean 10.1±0.9 days, n=15) resulting in a fledgling success rate of 67.5%. Total breeding success was 41.4%. The main cause of nesting failure include human disturbance (cutting reeds), predation, and effects of grazing and flooding.
