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Census, distribution and conservation status of roseate spoonbill Platalea ajaja in the Guayaquil Gulf Estuary, Ecuador Censo, distribucion y estado de conservacion de la espatula rosada Platalea ajaja en el estuario del Golfo de Guayaquil, Ecuador


Ornitologia Neotropical, 162: 175-185
Census, distribution and conservation status of roseate spoonbill Platalea ajaja in the Guayaquil Gulf Estuary, Ecuador Censo, distribucion y estado de conservacion de la espatula rosada Platalea ajaja en el estuario del Golfo de Guayaquil, Ecuador
In this study, we examine the current status of the Roseate Spoonbill (Platalea ajaja) population in different mangrove areas of the Gulf of Guayaquil. The field study was conducted from December 1998 to January 2002. A total of 22 field trips were realized, including observations from a boat and an over-flight surveillance trip in an aircraft through mangrove conservation monitoring routes. Boat trips also followed line transects (n = 9) of 25 and 4 km established in three different areas (northwest, northeast and southeast) of the Gulf of Guayaquil to conduct the censuses. The mean number of recorded birds was 40.5 birds (95% CI: 16.0-64.8), ranging from 1 to 100 individuals. Censusing of birds based on the Hayne model yield a number of 662 individuals in an area of 48,000 ha. The absolute and relative abundances were 0.7 birds/km and 0.014 birds/ha, respectively. Individuals were mainly aggregated in the northwestern and northeastern areas of the Guayaquil Gulf Estuary, and followed by the southeastern part. Wetlands destruction such as mangrove areas, agriculture, urbanization and non-controlled hunting have negative impacts on aquatic bird populations, including Roseate spoonbills. Field research is necessary for studying the relationship between the abundance of this species and disturbed and undisturbed mangrove areas. On the short term, the Roseate Spoonbill population may become threatened because of habitat loss.


Accession: 038056929



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