SUMMARY: One of the main threats to Audouin's gull (Larus audouinii) at Chafarinas Islands is predation on eggs and chicks by the yellow-legged gull (Larus cachinnans). During the 1999 and 2000 breeding seasons we tested the effects of supplementary refuge availability on chick survival. Well before the laying period, nine adjacent enclosures were erected inside Audouin's gull's breeding grounds and some of them were supplied with artificial refuges. Our results showed significantly greater chick survival in the enclosures with artificial refuges than in control ones. In 2000, an overall lower breeding success of Audouin's gull and a dilution of the refuge effect were observed. These results were probably related to foodshortage that year. We suggest that, along with other factors, an increase in refuge availability may significantly enhance Audouin's gull chick survival.

No abstract

Introducción: el virus respiratorio sincitial (VRS) es una de las principales causas de infección respiratoria en niños, con una importante morbimortalidad en menores de cinco años, siendo la segunda causa global de muerte entre las infecciones de vías respiratorias inferiores. El VRS se clasifica en dos subtipos según las diferencias antigénicas y suelen circular de forma concurrente. Tradicionalmente, se creía que el subtipo A causaba una infección más grave, aunque trabajos recientes han demostrado resultados contradictorios. Es un virus estacionario cuya temporada epidémica se produce en España entre diciembre y marzo. Objetivo: el objetivo del estudio es describir y comparar las temporadas