Reproductive biology of great cormorant (Phalacrocorax carbo sinensis) in the qinghai-tibet plateau

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	Reproductive biology of great cormorant (Phalacrocorax carbo sinensis) in the qinghai-tibet plateau
	Zhang, Tong-Zuo ; Li, Lai-Xing ; Lian, Xin-Ming ; Cai, Zhen-Yuan ; Su, Jian-Ping
	2007-06-01
发表期刊	WATERBIRDS ; Zhang TongZuo, Li LaiXing, Lian XinMing,Cai ZhenYuan,Su JianPing.Reproductive biology of great cormorant (Phalacrocorax carbo sinensis) in the qinghai-tibet plateau.WATERBIRDS,2007,30(2):305-309
摘要	There have been no detailed studies on reproductive biology of the Great Cormorant (Phalacrocorax carbo sinensis) in Qinghai-Tibet Plateau. We conducted such investigations during the breeding seasons of 1999 and 2000 in Qinghai-Lake Bird Isle, China. Great Cormorants began to migrate to Qinghai-Lake for reproduction from the middle of March and left from early October at the end of reproduction. Nesting periods were from early April to mid June and took 50 days. Egg-laying occurred during the three weeks from the end of April to 20 May. Females typically laid an egg every 1-2 days until clutch completion. Mean clutch size in the study area over two years was 3.3 (SE +/- 0.13, N = 68, range 1-5) and most (66.18%) fell within the range 3-4 eggs. Length of eggs averaged 61.01 mm and breadth averaged 34.13 mm. Fresh egg weight averaged 57.34 g (SE +/- 0.36, range 46.0-73.7 g, N = 179). Hatching success was 48.7% and fledging success was 64.9% over two years. Decline of available fish resources in Qinghai-Lake might be one of main causes of lower reproductive success. The causes of chick loss were possibly high altitude, high winds and prolonged rain.; There have been no detailed studies on reproductive biology of the Great Cormorant (Phalacrocorax carbo sinensis) in Qinghai-Tibet Plateau. We conducted such investigations during the breeding seasons of 1999 and 2000 in Qinghai-Lake Bird Isle, China. Great Cormorants began to migrate to Qinghai-Lake for reproduction from the middle of March and left from early October at the end of reproduction. Nesting periods were from early April to mid June and took 50 days. Egg-laying occurred during the three weeks from the end of April to 20 May. Females typically laid an egg every 1-2 days until clutch completion. Mean clutch size in the study area over two years was 3.3 (SE +/- 0.13, N = 68, range 1-5) and most (66.18%) fell within the range 3-4 eggs. Length of eggs averaged 61.01 mm and breadth averaged 34.13 mm. Fresh egg weight averaged 57.34 g (SE +/- 0.36, range 46.0-73.7 g, N = 179). Hatching success was 48.7% and fledging success was 64.9% over two years. Decline of available fish resources in Qinghai-Lake might be one of main causes of lower reproductive success. The causes of chick loss were possibly high altitude, high winds and prolonged rain.
文献类型	期刊论文
条目标识符	http://210.75.249.4/handle/363003/35479
专题	中国科学院西北高原生物研究所
推荐引用方式 GB/T 7714	Zhang, Tong-Zuo,Li, Lai-Xing,Lian, Xin-Ming,et al. Reproductive biology of great cormorant (Phalacrocorax carbo sinensis) in the qinghai-tibet plateau[J]. WATERBIRDS, Zhang TongZuo, Li LaiXing, Lian XinMing,Cai ZhenYuan,Su JianPing.Reproductive biology of great cormorant (Phalacrocorax carbo sinensis) in the qinghai-tibet plateau.WATERBIRDS,2007,30(2):305-309,2007.
APA	Zhang, Tong-Zuo,Li, Lai-Xing,Lian, Xin-Ming,Cai, Zhen-Yuan,&Su, Jian-Ping.(2007).Reproductive biology of great cormorant (Phalacrocorax carbo sinensis) in the qinghai-tibet plateau.WATERBIRDS.
MLA	Zhang, Tong-Zuo,et al."Reproductive biology of great cormorant (Phalacrocorax carbo sinensis) in the qinghai-tibet plateau".WATERBIRDS (2007).