CSIRO Publishing blank image blank image blank image blank imageBooksblank image blank image blank image blank imageJournalsblank image blank image blank image blank imageAbout Usblank image blank image blank image blank imageShopping Cartblank image blank image blank image You are here: Journals > Emu   
Emu
http://www.birdlife.org.au
  A Journal of BirdLife Australia
 
blank image Search
 
blank image blank image
blank image
 
  Advanced Search
   

Journal Home
About the Journal
Editorial Structure
Contacts
Content
Online Early
Current Issue
Just Accepted
All Issues
Special Issues
Research Fronts
Rowley Reviews
Virtual Issues
Sample Issue
For Authors
General Information
Scope
Submit Article
Author Instructions
Awards and Prizes
For Referees
Referee Guidelines
Review an Article
Annual Referee Index
For Subscribers
Subscription Prices
Customer Service
Print Publication Dates

red arrow Complete Archive
blank image
With the complete digital archive of Emu now online, we have selected some of the most interesting and significant papers for readers to access freely.

blue arrow e-Alerts
blank image
Subscribe to our Email Alert or RSS feeds for the latest journal papers.

red arrow Connect with BirdLife
blank image
facebook TwitterIcon LinkedIn

red arrow Connect with CP
blank image
facebook twitter LinkedIn

 

Article << Previous     |     Next >>   Contents Vol 111(2)

Breeding performance of the Imperial Shag (Phalacrocorax atriceps) in relation to year, laying date and nest location

Walter S. Svagelj A C and Flavio Quintana A B

A Biología y Manejo de Recursos Acuáticos, Centro Nacional Patagónico – CONICET, Boulevard Brown 2915, Puerto Madryn (U9120ACD), Chubut, Argentina.
B Wildlife Conservation Society, Amenabar 1595, Ciudad de Buenos Aires (C1426AKC), Argentina.
C Corresponding author. Email: tito@cenpat.edu.ar

Emu 111(2) 162-165 http://dx.doi.org/10.1071/MU10062
Submitted: 23 July 2010  Accepted: 26 November 2010   Published: 27 May 2011


 
PDF (165 KB) $25
 Export Citation
 Print
  
Abstract

The breeding productivity of seabirds usually declines over the course of a breeding season. Breeding productivity in colonial birds has also been found to be affected by the distance from a nest to the edge of a colony, with peripheral nests usually having lower productivity than centrally located nests. We evaluated the influence of laying date and nest location (distance from the edge of the colony) on clutch-size and breeding success of the Imperial Shag (Phalacrocorax atriceps) during three breeding seasons (2004–06) at Punta León, Argentina. There was no relationship between year, laying date or nest location and variation in clutch-size. Further, whereas breeding success did not differ between years, breeding success consistently decreased with laying date. We also found an interactive effect between laying date and nest location. Distance from the edge of the colony was not related to breeding success of Shags that laid either early or at the peak of the season, but the breeding success of late breeders increased with distance from the edge of the colony. Our findings of a seasonal decline in breeding success are consistent with the typical pattern exhibited by seabirds. Our results suggest that low-quality (young or less-capable) pairs that breed late in the season may benefit from nesting away from the edge of the colony, reducing levels of disturbance and risk of nest-predation.

Additional keywords:central–peripherial distribution, distance from the edge, parental quality, seabirds, seasonal decline.


References

Acha, E. M., Mianzan, H. W., Guerrero, R. A., Favero, M., and Bava, J. (2004). Marine fronts at the continental shelves of austral South America. Physical and ecological processes. Journal of Marine Systems 44, 83–105.
CrossRef |

Burnham, K. P., and Anderson, D. R. (2002). ‘Model Selection and Multimodel Inference: A Practical Information–Theoretic Approach.’ (Springer–Verlag: New York.)

Coulson, J. C. (1968). Differences in the quality of birds nesting in the centre and on the edge of a colony. Nature 217, 478–479.
CrossRef |

Coulson, J. C., and White, E. (1956). A study of colonies of the Kittiwake Rissa tridactyla (L.). Ibis 98, 63–79.
CrossRef |

Coulson, J. C., and White, E. (1958). The effect of age on the breeding biology of the Kittiwake Rissa tridactyla. Ibis 100, 40–51.
CrossRef |

Crawley, M. J. (2007). ‘The R Book.’ (Wiley: West Sussex, UK.)

Daunt, F., Wanless, S., Harris, M. P., and Monaghan, P. (1999). Experimental evidence that age-specific reproductive success is independent of environmental effects. Proceedings of the Royal Society of London. Series B. Biological Sciences 266, 1489–1493.
CrossRef |

Daunt, F., Wanless, S., Harris, M. P., Money, L., and Monaghan, P. (2007). Older and wiser: improvements in breeding success are linked to better foraging performance in European Shags. Functional Ecology 21, 561–567.
CrossRef |

Furness, R. W., and Monaghan, P. (1987). ‘Seabird Ecology.’ (Blackie: Glasgow.)

Lack, D. (1968). ‘Ecological Adaptations for Breeding in Birds.’ (Methuen: London.)

McCullagh, P., and Nelder, J. A. (1989). ‘Generalized Linear Models.’ (Chapman and Hall: New York.)

McNeil, R., and Léger, C. (1987). Nest-quality and reproductive success of early- and late-nesting Double-crested Cormorants. Wilson Bulletin 99, 262–267.

Moreno, J. (1998). The determination of seasonal declines in breeding success in seabirds. Etología 6, 17–31.

Nelson, J. B. (2005). ‘Pelicans, Cormorants and Their Relatives. The Pelecaniformes.’ (Oxford University Press: Oxford, UK.)

Perrins, C. M. (1970). The timing of birds’ breeding seasons. Ibis 112, 242–255.
CrossRef |

Quintana, F., and Yorio, P. (1998). Kelp Gull predation on an Imperial Cormorant colony in Patagonia. Marine Ornithology 26, 84–85.

Quintana, F., Wilson, R., Dell’Arciprete, P., Shepard, E., and Gómez Laich, A. (2011). Women from Venus, men from Mars: inter-sex foraging differences in the Imperial Cormorant Phalacrocorax atriceps a colonial seabird. Oikos 120, 350–358.
CrossRef |

R Development Core Team (2009). ‘R: A Language and Environment for Statistical Computing.’ (R Foundation for Statistical Computing: Vienna, Austria.) Available at http://www.R-project.org [Verified 14 May 2011].

Rivas, A. L., Dogliotti, A. I., and Gagliardini, D. A. (2006). Seasonal variability in satellite-measured surface chlorophyll in the Patagonian Shelf. Continental Shelf Research 26, 703–720.
CrossRef |

Saether, B. E. (1990). Age–specific variation in reproductive performance of birds. In ‘Current Ornithology. Vol. 7’. (Ed. D. M. Power.) pp. 251–283. (Plenum Press: New York.)

Schreiber, E. A., and Burger, J. (2002). ‘Biology of Marine Birds.’ (CRC Press: Boca Ratón, FL.)

Shaw, P. (1986). Factors affecting the breeding performance of Antarctic Blue-eyed Shag Phalacrocorax atriceps. Ornis Scandinavica 17, 141–150.
CrossRef |

Siegel-Causey, D., and Hunt, G. L. (1981). Colonial defense behavior in Double-crested and Pelagic Cormorants. Auk 98, 522–531.

Snow, B. K. (1960). The breeding biology of the Shag on the island of Lundy, Bristol Channel. Ibis 102, 554–575.
CrossRef |

Staverees, L., Crawford, R. J. M., and Underhill, L. G. (2008). Factors influencing the breeding success of Cape Gannets Morus capensis at Malgas Island in 2002/2003. Ostrich 79, 67–72.
CrossRef |

Svagelj, W. S. (2009). Breeding ecology of dimorphic seabirds in relation to parental investment and brood sex ratio theories. Ph.D. Thesis, University of Buenos Aires, Argentina. [In Spanish]

Sydeman, W. J., Penniman, J. F., Penniman, T. M., Pyle, P., and Ainley, D. G. (1991). Breeding performance in the Western Gull: effects of parental age, timing of breeding and year in relation to food availability. Journal of Animal Ecology 60, 135–149.
CrossRef |

Velando, A., and Freire, J. (2001). How general is the central–periphery distribution among seabird colonies? Nest spatial pattern in the European Shag. Condor 103, 544–554.
CrossRef |


   
Subscriber Login
Username:
Password:  

 
    
Legal & Privacy | Contact Us | Help

CSIRO

© CSIRO 1996-2015