scholarly journals The Effects of Hatching Date and Parental Quality on Chick Growth and Creching Age in the Chinstrap Penguin (Pygoscelis antarctica): A Field Experiment

The Auk ◽  
1997 ◽  
Vol 114 (1) ◽  
pp. 47-54 ◽  
Author(s):  
Juan Moreno ◽  
Jaime Potti ◽  
Santiago Merino
1996 ◽  
Vol 240 (1) ◽  
pp. 51-58 ◽  
Author(s):  
J. Vinuela ◽  
J. Moreno ◽  
L. M. Carrascal ◽  
J. J. Sanz ◽  
J. A. Amat ◽  
...  

Polar Biology ◽  
1999 ◽  
Vol 21 (2) ◽  
pp. 80-83 ◽  
Author(s):  
J. Belliure ◽  
L. M. Carrascal ◽  
E. Minguez ◽  
M. Ferrer

Parasitology ◽  
2012 ◽  
Vol 139 (6) ◽  
pp. 819-824 ◽  
Author(s):  
M. J. PALACIOS ◽  
F. VALERA ◽  
A. BARBOSA

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.


2015 ◽  
Vol 7 (2) ◽  
pp. 561-563 ◽  
Author(s):  
Seunghyun Kang ◽  
Jin-Woo Jung ◽  
Do Hwan Ahn ◽  
Jong Eun Lee ◽  
Jeong-Hoon Kim ◽  
...  

2015 ◽  
Vol 27 (4) ◽  
pp. 373-381 ◽  
Author(s):  
S. Jara-Carrasco ◽  
M. González ◽  
D. González-Acuña ◽  
G. Chiang ◽  
J. Celis ◽  
...  

AbstractIt has been demonstrated that persistent organic pollutants (POPs) can affect the immune system of mammals and birds. In this study, the concentration of different POPs and leukocytes in blood samples from three chinstrap penguin (Pygoscelis antarctica) populations was analysed in order to assess the impact on haematological parameters. Using blood sample smears, basophils, eosinophils, heterophils, lymphocytes and monocytes were quantified. Mature and immature red blood cells were counted and cell alterations in both white and red blood cells were analysed. At the same time, whole blood was analysed for POPs. The results showed that contaminants, such as dichlorodiphenyltrichloroethane and its metabolites (ΣDDT), as well as polychlorinated biphenyls (ΣPCB), had significant correlations to eosinophils, lymphocytes and heterophils. This indicates possible immunohaematological alterations derived from exposure to such contaminants. Cytological alterations were also observed, such as cytotoxic granules, toxic heterophils, and atypical and granulated lymphocytes, which would demonstrate that these seabirds are being exposed to stress agents that could be producing some alterations at a leukocytary cellular level.


Polar Biology ◽  
2003 ◽  
Vol 26 (8) ◽  
pp. 538-544 ◽  
Author(s):  
Vincenzo Penteriani ◽  
Javier Vi�uela ◽  
Josabel Belliure ◽  
Javier Bustamante ◽  
Miguel Ferrer

Polar Biology ◽  
1994 ◽  
Vol 14 (1) ◽  
Author(s):  
J. Moreno ◽  
L.M. Carrascal ◽  
J.J. Sanz ◽  
J.A. Amat ◽  
J.J. Cuervo

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