Keywords
Reserva Costanera Sur
Abundancia
gremios
cambios estacionales
Abstract
Changes in species composition and variation in the local abundance of guilds and populations of the waterbird community of Costanera Sur Reserve were analyzed from November 1988 to October 1989. An intense drought brought about a remarkable reduction of the flooding level of the ponds during summer, which produced an abrupt decline in the species richness and high qualitative dissimilarity between sampling occasions. The species returned to the Reserve as ponds became filled, influencing very little the community composition. Both guilds and populations showed important numeric fluctuations. All species were affected by drought, but they showed different trends of recovery. Diving and piscivorous guilds were the most strongly affected. Variations in the local abundance of guilds could be attributed to fluctuations in the availability of resources, but variations in the abundance of populations sometimes denied this hypothesis. Both the species-specific responses to differences in habitat structure and the nomadic behavior of species could be influencing the observed patterns.
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