La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Long-term trends in the breeding populations of waterbirds (1951-1985) at a sewage treatment plant
Auteurs :	S. Ashkenazi, Auteur
Type de document :	Article
Dans :	Ostrich (72(1-2) MAR 2001)
Article en page(s) :	10-19
Langues:	Anglais
Résumé :	Long-term (1951-1985) data on the breeding waterbird populations and habitat modifications at Cope Fiats sewage treatment works (Strandfontein) and Rondevlei Bird Sanctuary (Rondevlei) were assessed to establish the main factors affecting the breeding species richness and nest abundance. Fifty-two 'water-associated' breeding species were recorded in the Zeekoe River catchment waterbodies, 46 (88.5%) at Strandfontein, 38 (73.1%) at Rondevlei Bird Sanctuary (Rondevlei), 33 (63.5%) at Zeekoevlei and ten (19.2%) at Princess Vlei. Thirteen (25.5%) of the species were unique to Strandfontein and five (9.8%) to Rondevlei. Sorenson's similarity indices indicated high similarity (C(S) = 0.81) in species richness and low similarity in nest abundance pattern (C(N) = 0.10) for the paired sites Strandfontein-Rondevlei;. The lowest breeding species richness (11 species) was in winter (June) and the peak (42 species) was in spring (October). Twenty-four species joined the breeding population of Strandfontein during 1959-1976 (during which time pond wafer surface area increased 2372%). The mean breeding species richness increased significantly (chi (2)(2) = 14.42, P (2)(2), = 1472.2, P (2)(2) = 60.28, P

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