Artículo
Egg temperature and initial brood patch area determine hatching asynchrony in Magellanic Penguin Spheniscus magellanicus
Fecha de publicación:
01/2016
Editorial:
Wiley Blackwell Publishing, Inc
Revista:
Journal Of Avian Biology
ISSN:
0908-8857
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
In birds, the adaptive significance of hatching asynchrony has been under debate for many years and the parental effects on hatching asynchrony have been largely assumed but not often tested. Some authors suggest that hatching asynchrony depends on the incubation onset and many factors have been shown to influence hatching asynchrony in different species. Our objective was to analyze the exact timing of the onset of incubation and if this affects hatching asynchrony; and, in addition, which other factors (brood patch development, incubation position, adult body condition, intra-clutch egg dimorphism, laying date and year) affect hatching asynchrony in Magellanic penguins Spheniscus magellanicus. We first estimated the eggshell temperature at which embryo development starts, with a non-destructive and novel method. We then recorded individual egg temperatures in 61 nests during incubation, and related them, and other breeding parameters, to hatching asynchrony. We also observed incubation positions in 307 nests. We found a significant positive relationship between hatching asynchrony and the temperature that the first-laid egg experienced during egg laying and between hatching asynchrony and the initial brood patch area. We also found a negative relationship between hatching asynchrony and the difference in temperature between second and first-laid eggs within a clutch, measured after the egg-laying period was finished. We ruled out position of the eggs during incubation, adult body condition, egg volume, laying date, and study year as factors influencing hatching asynchrony. The egg temperature during laying and the difference in temperature between eggs of a clutch are determinants of hatching asynchrony in Magellanic penguins.
Palabras clave:
EGG TEMPERATURE
,
BROOD PATCH
,
HATCHING ASYNCHRONY
,
SPHENISCUS MAGELLANICUS
Archivos asociados
Licencia
Identificadores
Colecciones
Articulos(CCT - PATAGONIA NORTE)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - PATAGONIA NORTE
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - PATAGONIA NORTE
Articulos(SEDE CENTRAL)
Articulos de SEDE CENTRAL
Articulos de SEDE CENTRAL
Citación
Barrionuevo, Melina; Frere, Esteban; Egg temperature and initial brood patch area determine hatching asynchrony in Magellanic Penguin Spheniscus magellanicus; Wiley Blackwell Publishing, Inc; Journal Of Avian Biology; 47; 1; 1-2016; 16-25
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