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Parental behavior during incubation is an important aspect of the breeding system, which varies greatly among shorebirds. There are, however, few studies of incubation sex roles in shorebirds during darkness. In Charadrius species, males are believed to perform most of the incubation during the night. In this study of night- and daytime incubation sex roles in the Common Ringed Plover (Charadrius hiaticula), males tended to do more of the nighttime incubation (58%) than did females; during the day the roles tended to be reversed (males 45%), but the differences were not statistically significant. The reasons why mates of the Common Ringed Plover seem to share nocturnal incubation more equally than do other Charadrius species are not clear but may involve differences in food levels and day length between areas.  Papel de los Sexos durante la Incubación en Charadrius hiaticula  Resumen. El comportamiento parental durante la incubación es un aspecto importante del sistema reproductivo, el cual varía considerablemente entre las aves playeras. Sin embargo, los estudios sobre el papel de los sexos en la incubación nocturna en las aves playeras son escasos. En las especies de Charadrius, se cree que los machos realizan la mayor parte de la incubación nocturna. En este estudio, sobre el papel de los sexos durante los periodos de incubación nocturnos y diurnos en Charadrius hiaticula, los machos tendieron a realizar una mayor parte de la incubación nocturna (58%) que las hembras; durante el día los papeles tendieron a revertirse (machos 45%), pero las diferencias no fueron significativas estadísticamente. Las razones por las cuales las parejas de C. hiaticula parecen compartir más equitativamente la incubación nocturna que otras especies de Charadrius no están claras pero pueden estar relacionadas con diferencias en los niveles de alimento y duración del día entre áreas.

Sex Roles During Incubation in the Common Ringed Plover