SciELO - Scientific Electronic Library Online

 
vol.24 issue1Waterbird occurrence and abundance in the Strobel Plateau, Patagonia, ArgentinaA technique to estimate density and monitor populations of the Spotted Nothura (Nothura maculosa) in grasslands habitats author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand

Journal

Article

Indicators

  • Have no cited articlesCited by SciELO

Related links

Share


El hornero

Print version ISSN 0073-3407

Abstract

SAPOZNIKOW, Alexandra  and  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.

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

        · abstract in Spanish     · text in Spanish     · Spanish ( pdf )

 

Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License