文章基本信息

标题：Is the Hamerkop Scopus umbretta a neocolonist or an opportunist nester?
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作者：SH Kaweesa ; RJ Jonkvorst ; R Katebaka 等
期刊名称：Scopus: Journal of East African Ornithology
印刷版ISSN：2313-1799
出版年度：2012
卷号：32
页码：35-38
语种：English
出版社：African journals online
摘要：We report two cases of large aggregations of Hamerkop Scopus umbretta nests in relatively small areas; the first had a maximum of 639 nests in 2004, all within an area of about 8 km2 near to Entebbe, Uganda. However, in recent years there were far fewer nests, with less than a hundred in 2012. The reasons for this decline are unclear. The second site, in Queen Elizabeth National Park, had 56 nests in 2004. There are very few previous records of such gregarious behaviour in this species. Even though a pair may build more than one nest, it implies the presence of a large concentration of birds, which must therefore require rich food sources.