Juvenile helping in the moorhen,Gallinula chloropus |
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| Affiliation: | 1. CEFS, Université de Toulouse, INRA, Castanet Tolosan, France;2. Université Lyon 1, CNRS, Laboratoire de Biométrie et Biologie Evolutive, F-69622 Villeurbanne, France;3. Université de Lyon, VetAgro Sup, 1 Avenue Bourgelat, 69280 Marcy l’étoile, France;4. Department of Biology, University of Saskatchewan, 112 Science Place, Saskatoon, SK S7N 5E2, Canada;1. Parc Zoològic de Barcelona, Parc de la Ciutadella s/n, 08003 Barcelona, Spain;2. Departament de Sanitat i Anatomia Animals, Universitat Autònoma de Barcelona, Bellaterra (Cerdanyola del Vallès), 08193 Barcelona, Spain;3. Institut de Recerca i Tecnologia Agroalimentàries (IRTA), Centre de Recerca en Sanitat Animal (CReSA), Campus de la Universitat Autònoma de Barcelona, Bellaterra (Cerdanyola del Vallès), 08193 Barcelona, Spain;4. Servicio de Virología, Laboratorio Central de Veterinaria, Ctra. Algete, km 8, Algete, 28110 Madrid, Spain |
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| Abstract: | In a 3-year study of the moorhen, Gallinula chloropus, some chicks from first broods stayed on their natal territory once they had reached independence, and helped to rear their younger, second brood, siblings. Juvenile dispersal was constrained by habitat saturation, and first brood young were forced to stay on their natal territory. Juveniles that hatched early in the year were forced to stay longer, and helped more than those that hatched late. The total feeding rates to broods with and without juvenile helpers were the same, but parents with helpers reduced their feeding rates relative to parents without helpers. Pairs with helpers (=pairs attempting second broods) reared more chicks per nesting, attempt than pairs rearing chicks at the same time of year without helpers (=pairs attempting first clutch renests). This was true both for all clutches, and for hatched clutches only, even when controlling for parental quality, territory size and scasonal effects. |
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