SciELO - Scientific Electronic Library Online

 
vol.24 número1Presencia y abundancia de aves acuáticas en la meseta Strobel, Patagonia, ArgentinaUna técnica para la estimación de la densidad y el monitoreo de poblaciones de Inambú Común (Nothura maculosa) en ambientes de pastizal índice de autoresíndice de materiabúsqueda de artículos
Home Pagelista alfabética de revistas  

Servicios Personalizados

Articulo

Indicadores

  • No hay articulos citadosCitado por SciELO

Links relacionados

  • En proceso de indezaciónCitado por Google
  • No hay articulos similaresSimilares en SciELO
  • En proceso de indezaciónSimilares en Google

Bookmark


El hornero

versión impresa ISSN 0073-3407

Resumen

SAPOZNIKOW, Alexandra  y  QUINTANA, Flavio. Asynchronous laying and renesting in the Rock Shag (Phalacrocorax magellanicus): an evidence of the characteristics of their food sources?. Hornero [online]. 2009, vol.24, n.1, pp. 21-30. ISSN 0073-3407.

We studied the breeding biology of the Rock Shag (Phalacrocorax magellanicus) at Punta Loma colony, Chubut, Argentina, during 2001 and 2002 breeding seasons. The egg laying period was long (3-4 months) and asynchronous, while fledging success was low (50%). During the first breeding season, the number of fledglings per nest was not related to laying date, while during the second breeding season there was a reduction in the fledging success of the pairs that laid their eggs late in the season. A high percentage of couples renested after loosing the first clutch (16-22%). In both seasons, the number of chicks fledged in replacement clutches was similar to that in first clutches. The extended and asynchronous egg-laying period, combined with a high rate of renesting (with a fledging success similar to that of single-laying couples), and the low relationship observed between breeding success and laying date, supports the idea of a highly stable and predictable food source for the Rock Shag.

Palabras llave : Argentina; Asynchrony; Breeding biology; Phalacrocorax magellanicus; Renesting; Rock Shag.

        · resumen en Español     · texto en Español     · pdf en Español