科研之友
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摘要
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.
- 出版日期2010-9
