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Article << Previous     |     Next >>   Contents Vol 113(2)

Female-biased mortality of Magellanic Penguins (Spheniscus magellanicus) on the wintering grounds

Ralph Eric Thijl Vanstreels A E, Andréa Corrado Adornes B, Paula Lima Canabarro B, Valeria Ruoppolo A C, Marcos Amaku D, Rodolfo Pinho da Silva-Filho B and José Luiz Catão-Dias A

A Laboratório de Patologia Comparada de Animais Selvagens, Departamento de Patologia, Faculdade de Medicina Veterinária e Zootecnia, Universidade de São Paulo, Avenida Professor Orlando Marques de Paiva 87, 05088-000 São Paulo – SP, Brazil.
B Centro de Recuperação de Animais Marinhos, Museu Oceanográfico Professor Eliézer de Carvalho Rios, Universidade Federal do Rio Grande, Rua Capitão Heitor Perdigão 10, 92200-580 Rio Grande – RS, Brazil.
C Emergency Relief Team, International Fund for Animal Welfare, 290 Summer Street, Yarmouth Port, MA 02675, USA.
D Laboratório de Epidemiologia e Bioestatística, Departamento de Medicina Veterinária Preventiva e Saúde Animal, Faculdade de Medicina Veterinária e Zootecnia, Universidade de São Paulo, Avenida Professor Orlando Marques de Paiva 87, 05088-000 São Paulo – SP, Brazil.
E Corresponding author. Email: ralph_vanstreels@yahoo.com.br

Emu 113(2) 128-134 http://dx.doi.org/10.1071/MU12060
Submitted: 29 July 2012  Accepted: 20 December 2012   Published: 1 May 2013


 
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Abstract

Magellanic Penguins (Spheniscus magellanicus) migrate thousands of kilometres from their breeding colonies every winter. Despite the significance of this seasonal movement, aspects of its ecology and implications for conservation biology remain enigmatic. We examined the sex of 528 Magellanic Penguins either beachcast (found dead ashore) or stranded (found alive ashore) in wintering grounds of southern Brazil from 2002 to 2009. We found evidence that: (a) among beachcast Penguins, females significantly outnumbered males; (b) for stranded Penguins that had not been oiled, the sex-ratio was significantly female-biased, whereas among oiled Penguins the sex-ratio was even; (c) among stranded Penguins, females had a lower rate of survival through rehabilitation than males; and (d) for both sexes, juvenile Penguins surviving rehabilitation had greater body mass upon admission than those that died. Our findings suggest an increased mortality of juvenile and adult females might occur during migration, and emphasise that sex may play a significant role in the movement ecology and conservation of this species. Conservation efforts might thus benefit from incorporating sex-based strategies to ensure that biased sex mortality does not have a negative effect on the species, and researchers are encouraged to consider sex as a key component in the ecological research and conservation efforts of this, and other, species of penguin.

Additional keywords: seabird, South American birds, ecology, survival, sexual dimorphism.


References

Abdi, H. (2007). Bonferroni and Šidák corrections for multiple comparisons. In ‘Encyclopedia of Measurement and Statistics’. (Ed. N. J. Salkind.) pp. 1–9. (Sage: Thousand Oaks, CA.)

Baldassin, P., Santos, R. A., Cunha, J. M. M., Werneck, M. R., and Gallo, H. (2010). Cephalopods in the diet of Magellanic Penguins Spheniscus magellanicus found on the coast of Brazil. Marine Ornithology 38, 55–57.

Boersma, P. D. (1998). Population trends of the Galápagos Penguin: impacts of El Niño and La Niña. Condor 100, 245–253.
CrossRef |

Boersma, P. D. (2008). Penguins as marine sentinels. Bioscience 58, 597–607.
CrossRef |

Boersma, P. D., and Rebstock, G. A. (2009). Flipper bands do not affect foraging-trip duration of Magellanic Penguins. Journal of Field Ornithology 80, 408–418.
CrossRef |

Boersma, P. D., Stokes, D. L., and Yorio, P. M. (1990). Reproductive variability and historical change of Magellanic Penguins (Spheniscus magellanicus) at Punta Tombo, Argentina. In ‘Penguin Biology’. (Eds L. S. Davis and J. T. Darby.) pp. 15–43. (Academic Press: San Diego, CA.)

Boersma, P. D., Stokes, D. L., and Strange, I. J. (2002). Applying ecology to conservation: tracking breeding penguins at New Island South Reserve, Falkland Islands. Aquatic Conservation: Marine and Freshwater Ecossystems 12, 63–74.
CrossRef |

Borboroglu, P. G., Yorio, P., Boersma, P. D., Valle, H. D., and Bertellotti, M. (2002). Habitat use and breeding distribution of Magellanic Penguins in northern San Jorge Gulf, Patagonia, Argentina. Auk 119, 233–239.
CrossRef |

Brennan, L. A., Buchanan, J. B., Schick, C. T., and Herman, S. G. (1991). Estimating sex ratios with discriminant function analysis: the influence of probability cutpoints and sample size. Journal of Field Ornithology 62, 357–366.

Brook, B. W., Burgman, M. A., and Frankham, R. (2000). Differences and congruencies between PVA packages: the importance of sex ratio for predictions of extinction risk. Ecology and Society 4, 6.

Clausen, A. P., and Pütz, K. (2002). Recent trends in diet composition and productivity of Gentoo, Magellanic and Rockhopper Penguins in the Falkland Islands. Aquatic Conservation: Marine and Freshwater Ecosystems 12, 51–61.
CrossRef |

Costantini, V., Guaricci, A. C., Laricchiuta, P., Rausa, P., and Lacalandra, G. M. (2008). DNA sexing in Humboldt Penguins (Spheniscus humboldti) from feather samples. Animal Reproduction Science 106, 162–167.
CrossRef | CAS | PubMed |

Culik, B., Hennicke, J., and Martin, T. (2000). Humboldt Penguins outmanoeuvring El Niño. Journal of Experimental Biology 203, 2311–2322.
| CAS | PubMed |

da S. Fonseca, V. S., Petry, M. V., and Jost, A. H. (2001). Diet of the Magellanic Penguin on the Coast of Rio Grande do Sul, Brazil. Waterbirds 24, 290–293.
CrossRef |

Dale, S. (2001). Female-biased dispersal, low female recruitment, unpaired males, and the extinction of small and isolated bird populations. Oikos 92, 344–356.
CrossRef |

Davis, L. S., and Speirs, E. A. H. (1990). Mate choice in penguins. In ‘Penguin Biology’. (Eds L. S. Davis and J. T. Darby.) pp. 377–398. (Academic Press: San Diego, CA.)

Donald, P. F. (2007). Adult sex ratios in wild bird populations. Ibis 149, 671–692.
CrossRef |

Fargallo, J. A., Polo, V., Neve, L., Martín, J., Dávila, J. A., and Soler, M. (2006). Hatching order and size-dependent mortality in relation to brood sex ratio composition in Chinstrap Penguins. Behavioral Ecology 17, 772–778.
CrossRef |

Forero, M. G., Hobson, K. A., Bortolotti, G. R., Donázar, J. A., Bertellotti, M., and Blanco, G. (2002). Food resource utilisation by the Magellanic Penguin evaluated through stable-isotope analysis: segregation by sex and age and influence on offspring quality. Marine Ecology Progress Series 234, 289–299.
CrossRef |

Frere, E., Gandini, P., and Lichtschein, V. (1996). Variacion latitudinal en la dieta del pinguino de Magallanes (Spheniscus magellanicus) en la costa Patagonica, Argentina. Ornitologia Neotropical 7, 35–41.

García-Borboroglu, P., Boersma, P. D., Ruoppolo, V., Pinho da Silva-Filho, R., Adornes, A. C., Conte-Sena, D., Velozo, R., Myaji-Kolesnikovas, C., Dutra, G., Maracini, P., Carvalho-do-Nascimento, C., Ramos-Júnior, V., Barbosa, L., and Serra, S. (2010). Magellanic Penguin mortality in 2008 along the SW Atlantic coast. Marine Pollution Bulletin 60, 1652–1657.
CrossRef | PubMed |

Hobson, K. A. (1999). Tracing origins and migration of wildlife using stable isotopes: a review. Oecologia 120, 314–326.
CrossRef |

Lasiewski, R. C., and Dawson, W. R. (1967). A re-examination of the relation between standard metabolic rate and body weight in birds. Condor 69, 13–23.
CrossRef |

Le Galliard, J. F., Fitze, P. S., Ferrière, R., and Clobert, J. (2005). Sex ratio bias, male aggression, and population collapse in lizards. Proceedings of the National Academy of Sciences of the United States of America 102, 18231–18236.
CrossRef | CAS | PubMed |

Luna-Jorquera, G., and Culik, B. M. (2000). Metabolic rates of swimming Humboldt Penguins. Marine Ecology Progress Series 203, 301–309.
CrossRef | CAS |

McCarthy, M. A., Burgman, M. A., and Ferson, S. (1995). Sensitivity analysis of models of population viability. Biological Conservation 73, 93–100.

Moreno, J., Potti, J., Yorio, P., and García-Borboroglu, P. (2001). Sex differences in cell-mediated immunity in the Magellanic Penguin Spheniscus magellanicus. Annales Zoologici Fennici 38, 111–116.

Olsson, O., and van der Jeugd, H. P. (2002). Survival in King Penguins Aptenodytes patagonicus: temporal and sex-specific effects of environmental variability. Oecologia 132, 509–516.
CrossRef |

Petry, M. V., and da S. Fonseca, V. S. (2002). Effects of human activities in the marine environment on seabirds along the coast of Rio Grande do Sul, Brazil. Ornitologia Neotropical 13, 137–142.

Pinto, M. B. L. C., Siciliano, S., and Beneditto, A. P. M. (2006). Stomach contents of the Magellanic Penguin Spheniscus magellanicus from the northern distribution limit on the Atlantic coast of Brazil. Marine Ornithology 35, 77–78.

Pütz, K., Ingham, R. J., and Smith, J. G. (2000). Satellite tracking of the winter migration of Magellanic Penguins Spheniscus magellanicus breeding in the Falkland Islands. Ibis 142, 614–622.
CrossRef |

Pütz, K., Ingham, R. J., and Smith, J. G. (2002). Foraging movements of Magellanic Penguins Spheniscus magellanicus during the breeding season in the Falkland Islands. Aquatic Conservation: Marine and Freshwater Ecosystems 12, 75–87.
CrossRef |

Pütz, K., Schiavini, A., Rey, A. R., and Lüthi, B. H. (2007). Winter migration of Magellanic Penguins (Spheniscus magellanicus) from the southernmost distributional range. Marine Biology 152, 1227–1235.
CrossRef |

Raya-Rey, A., Pütz, K., Scioscia, G., Lüthi, B., and Schiavini, A. (2012). Sexual differences in the foraging behaviour of Magellanic Penguins related to stage of breeding. Emu 112, 90–96.
CrossRef |

Rodrigues, S. C., Adornes, A. C., Santos-Filho, E. A., Pinho da Silva-Filho, R., and Colares, E. P. (2010). Surviving probability indicators of landing juvenile Magellanic Penguins arriving along the southern Brazilian coast. Brazilian Archives of Biology and Technology 53, 419–424.
CrossRef |

Scherer, J. F. M., Scherer, A. L., and Petry, M. V. (2011). A survey of beachcast seabirds along the coast of Rio Grande do Sul, southern Brazil. Revista Brasileira de Ornitologia 19, 505–513.

Scolaro, J. A. (1987). A model life table for Magellanic Penguins (Spheniscus magellanicus) at Punta Tombo, Argentina. Journal of Field Ornithology 58, 432–441.

Pinho da Silva-Filho, R., and Ruoppolo, V. (2007). Sphenisciformes (Pinguim). In ‘Tratado de Animais Selvagens: Medicina Veterinária’. (Eds Z. S. Cubas, J. C. R. Silva and J. L. Catão-Dias.) pp. 309–323. (Roca: São Paulo.)

Stephens, M. A. (1986). Tests Based on EDF Statistics. In ‘Goodness-of-Fit Techniques’. (Eds R. B. D’Agostino and M. A. Stephens.) pp. 1–15. (Marcel Dekker: New York.)

Stokes, D. L., and Boersma, P. D. (1999). Where breeding Magellanic Penguins Spheniscus magellanicus forage: satellite telemetry results and their implications for penguin conservation. Marine Ornithology 27, 59–65.

Stokes, D. L., and Boersma, P. D. (2000). Nesting density and reproductive success in a colonial seabird, the Magellanic Penguin. Ecology 81, 2878–2891.
CrossRef |

Stokes, D. L., Boersma, P. D., and Davis, L. S. (1998). Satellite tracking of Magellanic Penguin migration. Condor 100, 376–381.
CrossRef |

Taylor, S. S., Leonard, M. L., and Boness, D. J. (2001). Aggressive nest intrusions by male Humboldt Penguins. Condor 103, 162–165.
CrossRef |

Thompson, K. R. (1993). Variation in Magellanic Penguin Spheniscus magellanicus diet in the Falkland Islands. Marine Ornithology 21, 51–67.

van Toor, M. L., Jaberg, C., and Safi, K. (2011). Integrating sex-specific habitat use for conservation using habitat suitability models. Animal Conservation 14, 512–520.
CrossRef |

Vanstreels, R. E. T., Adornes, A. C., Ruoppolo, V., Canabarro, P. L., Pinho da Silva-Filho, R., and Catão-Dias, J. L. (2011). Gender determination from morphometrics in migrating Magellanic Penguins (Spheniscus magellanicus). Marine Ornithology 39, 215–220.

Vargas, F. H., Harrison, S., Rea, S., and Macdonald, D. W. (2006). Biological effects of El Niño on the Galápagos Penguin. Biological Conservation 127, 107–114.
CrossRef |

Walker, B. G., and Boersma, P. D. (2003). Diving behavior of Magellanic Penguins (Spheniscus magellanicus) at Punta Tombo, Argentina. Canadian Journal of Zoology 81, 1471–1483.
CrossRef |

Williams, T. D. (Ed.) (1995). ‘The Penguins: Spheniscidae.’ (Oxford University Press: Oxford, UK.)

Williams, T. D., and Boersma, P. D. (1995). Magellanic Penguin Spheniscus magellanicus. In ‘The Penguins: Spheniscidae’. (Ed. T. D. Williams.) pp. 249–258. (Oxford University Press: Oxford, UK.)

Wilson, R. P., Scolaro, J. A., Peters, G., Laurenti, S., Kierspel, M., Gallelli, H., and Upton, J. (1995). Foraging areas of Magellanic Penguins Spheniscus magellanicus breeding at San Lorenzo, Argentina, during the incubation period. Marine Ecology Progress Series 129, 1–6.
CrossRef |

Wilson, R. P., Scolaro, J. A., Grémillet, D., Kierspel, M. A. M., Laurenti, S., Upton, J., Gallelli, H., Quintana, F., Frere, E., Müller, G., Straten, M. T., and Zimmer, I. (2005). How do Magellanic Penguins cope with variability in their access to prey? Ecological Monographs 75, 379–401.
CrossRef |

Yorio, P., Frere, E., Gandini, P., and Conway, W. (1999). Status and conservation of seabirds breeding in Argentina. Bird Conservation International 9, 299–314.
CrossRef |


   
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