INVESTIGADORES
SOMOZA Gustavo Manuel
artículos
Título:
Field Sexing Olrog´s Gull (Larus atlanticus) Using Morphometry
Autor/es:
PABLO F. PETRACCI; JULIÁN M. BURGOS; GABRIELA C. LÓPEZ; KASPAR DELHEY; MARTÍN CARRIZO; RODOLFO SARRIA; MARTÍN SOTELO; GUSTAVO M. SOMOZA; LUCIANO F. LA SALA
Revista:
WATERBIRDS (DE LEON SPRINGS, FLA.)
Editorial:
WATERBIRD SOC
Referencias:
Año: 2018 p. 411 - 416
ISSN:
1524-4695
Resumen:
Sex identification of birds is a key component of field studies on the biology and ecology of wild birds. Orog?s Gull (Larus atlanticus) is a vulnerable species; however, no study had addressed the relationship between body measurements and sex in this species. Several external body measurements and mass were taken from adult Olrog?s Gull at Isla del Puerto in the Bahía Blanca Estuary, Argentina. Blood samples were collected for molecular sexing. All measurements showed significant differences between sexes, with males being significantly larger (range: 4-15.1%) in all measurements. Predictive modeling included different combinations of measurements. The combination of head-bill length, bill depth, wing length and body mass resulted in the best fitting model, closely followed by one that included the same variables with the exception of wing length. Cross-validation analysis shows that these two models performed equally well and correctly assigned the sex in 95.5% of all birds, in 96.0% of males, and 95.1% of females. Therefore, we suggest using the second best model. Results show the validity of these measurements and provide simple logistic functions to readily and reliably determine the sex of Olrog?s Gulls in the field.