Sex ratio of the Kelp Gull Larus dominicanus (Charadriiformes: Laridae) on the Brazilian coast

Autor(es)

de Mendonca Dantas, Gisele Pires ^[1] ; Lima Rueda, Andre Veloso ^[1] ; Santos, Fernanda de Almeida ^[1] ; Morgante, Joao Stenghel ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Biociencias, BR-05508090 Sao Paulo, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: REVISTA BRASILEIRA DE ORNITOLOGIA; v. 18, n. 3, p. 152-156, SEP 2010.
• Citações Web of Science: 0

Resumo

The Kelp Gull Larus dominicanus is a widely distributed seabird in the Southern Hemisphere. This species has presented great population expansion over the last decades, provoking in the displacement of several other seabird and mammals species. The evaluation of population characteristics is essential for creating management guidelines and protection programs. In this study, we examined the sex ratio of L. dominicanus in ten colonies along the Brazilian coast using molecular markers. Additionally, we investigated whether male and female chicks showed different growth rates of the tarsus, wing and bill. L. dominicanus populations did not differ in sex ratio in the ten populations analyzed and did not show temporal differences in sex ratio at Guararitama and Moleques do Sul colonies. We did not observe differences in tarsus, wing and bill growth between male and female chicks. In conclusion, our results indicate that this species shows the expected sex ratio of 1:1. Chicks males and females of L. dominicanus did not show differences in growth, which can indicate that both sex show similar energetic cost to development. (AU)

• Processo FAPESP: 03/01599-1 - Biologia reprodutiva, estrutura populacional e variabilidade genética de Larus dominicanus
• Beneficiário: Gisele Pires de Mendonça Dantas
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 05/55438-4 - Filogeografia de vertebrados neotropicais: padrões de variação, inferências de processos evolutivos e implicações para a conservação biológica
• Beneficiário: João Stenghel Morgante
• Modalidade de apoio: Auxílio à Pesquisa - Regular