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A comparison of two methods to estimate breeding productivity in a colonial ground-nesting gull Larus cachinnans

AutorMartínez-Abraín, Alejandro; Oro, Daniel ; Izquierdo, Juanjo; Ferrís, Vicente; Belenguer, Roque
Palabras claveComunidad Valencia
Columbretes
Benidorm Island
Yellow-legged Gulls
Mark-recapture estimates
Larus cachinnans
Census counts
Fecha de publicación2003
EditorAfrican Seabird Group
CitaciónMarine Ornithology 31(1): 71-74 (2003)
ResumenWe compared two methods commonly used to estimate breeding productivity of ground-nesting gulls: mark-recapture of ringed chicks and counts of flocks of fledglings resting at sea. Counts of the number of nests were also recorded to estimate productivity as average number of fledglings per breeding pair. Our field study was done at two locations at the western Mediterranean (Columbretes and Benidorm Islands) where small and isolated colonies of Yellow-legged Gulls (Larus cachinnans michahellis) occur. Estimates derived from direct counts were assumed to be relatively unbiased because of the small size of the study islands. We found that mark-recapture provided accurate results (similar to those obtained by counting flocks) only when mortality of chicks between capture and counts was low. Whenever both methods are applicable we recommend using flock counts to estimate productivity because it requires less input from the researcher and has little or no disturbance cost for the gulls.
Versión del editorhttp://www.marineornithology.org/PDF/31_1/31_1_10_martinez.pdf
URIhttp://hdl.handle.net/10261/98995
Identificadoresissn: 1018-3337
e-issn: 2074-1235
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