Hatching asynchrony, sibling hierarchies and brood reduction in the Chinstrap penguin Pygoscelis antarctica

Polar Biology ◽  
1994 ◽  
Vol 14 (1) ◽  
Author(s):  
J. Moreno ◽  
L.M. Carrascal ◽  
J.J. Sanz ◽  
J.A. Amat ◽  
J.J. Cuervo
Keyword(s):  
Chinstrap Penguin ◽  
Hatching Asynchrony ◽  
Brood Reduction ◽  
Pygoscelis Antarctica

Factors that affect hatching asynchrony in the chinstrap penguin ( Pygoscelis antarctica )

Polar Biology ◽  
2001 ◽  
Vol 24 (5) ◽  
pp. 338-342 ◽  
Author(s):  
Ana de León ◽  
Guillermo Soave ◽  
Vanina Ferretti ◽  
Juan Moreno
Keyword(s):  
Chinstrap Penguin ◽  
Hatching Asynchrony ◽  
Pygoscelis Antarctica

Lack's Brood Reduction Hypothesis and Avian Hatching Asynchrony: What's Next?

Oikos ◽  
1996 ◽  
Vol 76 (3) ◽  
pp. 613 ◽  
Author(s):  
Trond Amundsen ◽  
Tore Slagsvold
Keyword(s):  
Hatching Asynchrony ◽  
Brood Reduction

Experimental assessment of the effects of gastrointestinal parasites on offspring quality in chinstrap penguins (Pygoscelis antarctica)

Parasitology ◽  
2012 ◽  
Vol 139 (6) ◽  
pp. 819-824 ◽  
Author(s):  
M. J. PALACIOS ◽  
F. VALERA ◽  
A. BARBOSA
Keyword(s):  
Growth Rate ◽  
Body Mass ◽  
Strong Relationship ◽  
Chinstrap Penguin ◽  
Gastrointestinal Parasites ◽  
Helminth Parasites ◽  
Offspring Quality ◽  
Host Fitness ◽  
Pygoscelis Antarctica ◽  
Negative Effect

SUMMARYParasites reduce host fitness and consequently impose strong selection pressures on their hosts. It has been hypothesized that parasites are scarcer and their overall effect on hosts is weaker at higher latitudes. Although Antarctic birds have relatively low numbers of parasites, their effect on host fitness has rarely been investigated. The effect of helminth parasitism on growth rate was experimentally studied in chinstrap penguin (Pygoscelis antarctica) nestlings. In a total of 22 two-nestling broods, 1 nestling was treated with anthelminthics (for cestodes and nematodes) while its sibling was left as a control. Increased growth rate was predicted in de-wormed nestlings compared to their siblings. As expected, 15 days after treatment, the experimental nestlings had increased body mass more than their siblings. These results show a non-negligible negative effect of helminth parasites on nestling body condition that would presumably affect future survival and thus fitness, and it has been suggested there is a strong relationship between body mass and mortality in chinstrap penguins.

Avian Breeding Adaptations: Hatching Asynchrony, Brood Reduction, and Nest Failure

1981 ◽  
Vol 56 (3) ◽  
pp. 253-277 ◽  
Author(s):  
Anne Barrett Clark ◽  
David Sloan Wilson
Keyword(s):  
Hatching Asynchrony ◽  
Brood Reduction ◽  
Nest Failure
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