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Waterbirds at Paarl Waste Water Treatment Works, South Africa, 1994-2004: seasonality, trends and conservation importance

机译：南非Paarl废水处理厂的水鸟，1994-2004年：季节性，趋势和保护重要性

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Numbers of waterbirds were counted monthly from May 1994 to April 2004 at Paarl Waste Water Treatment Works, South Africa. Seventy-two waterbird species were recorded, of which 33 species (46%) were recorded breeding. Mean summer and winter counts were 2822 plus or minus 504 and 1651 plus or minus 251 birds, respectively. Summer peaks were driven primarily by large numbers of White-winged Terns (mean summer count = 858 or 34% of total count). Resident species dominated from December to April, whereas Palaearctic migrants peaked from December to March. Ducks and geese had greatest numbers from December to April and resident waders and grebes peaked from April to July. Flamingos peaked in October and November with another small peak in June. Gulls and terns had two peaks, one in November-March, driven by migrant White-winged Terns, the other in July and August, driven by abundance of resident Benguelan (Hartlaub's) Gulls. White-winged Terns showed the greatest decline (82%) of all species. Influx of Little Grebe and Red-billed Teal during winter showed a positive correlation with rainfall, while Egyptian Goose, Yellow-billed Duck and Cape Shoveler numbers declined as winter and spring rainfall increased. Paarl Waste Water Treatment Works ranked as the second-most important wastewater treatment works for waterbirds in the Cape Town metropole. It supported globally and regionally important numbers of 11 species and qualifies as a global and/or subregional Important Bird Area and Ramsar Site.
机译：从1994年5月至2004年4月，在南非的Paarl废水处理厂每月对水鸟的数量进行计数。记录了72种水鸟物种，其中33种（46％）被记录为繁殖。夏季和冬季的平均数分别为2822只正负504只和1651只正负251只。夏季高峰主要是由大量白翅燕鸥造成的（夏季平均数量= 858或总数量的34％）。居民物种在12月至4月占主导地位，而古北移民在12月至3月达到顶峰。从12月至4月，鸭和鹅的数量最多，从4月至7月，居民涉禽和and的数量最多。火烈鸟在10月和11月达到顶峰，6月又出现一个小高峰。海鸥和燕鸥有两个高峰，一个在11月至3月，由移民白翅燕鸥带动，另一个在7月和8月，由居民本格拉兰（Hartlaub's Gulls）带动。白翅燕鸥的数量下降幅度最大（82％）。随着冬季和春季降雨增加，冬季小格里布河和红嘴小野鸭的涌入与降雨量呈正相关，而埃及鹅，黄嘴鸭和斯威勒角的数量减少。 Paarl废水处理厂被列为开普敦都会区水鸟的第二重要废水处理厂。它支持了全球和区域重要的11种物种，并具有全球和/或次区域重要鸟类保护区和拉姆萨尔遗址的资格。

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