Comparative foraging behaviour of sympatric Humboldt and Magellanic Penguins reveals species-specific and sex-specific strategies

2013 ◽  
Vol 113 (2) ◽  
pp. 145-153 ◽  
Author(s):  
Andrea Raya Rey ◽  
Klemens Pütz ◽  
Alejandro Simeone ◽  
Luciano Hiriart-Bertrand ◽  
Ronnie Reyes-Arriagada ◽  
...  
Keyword(s):  
Foraging Behaviour ◽  
Magellanic Penguins ◽  
Species Specific

Sexual differences in the foraging behaviour of Magellanic Penguins related to stage of breeding

2012 ◽  
Vol 112 (2) ◽  
pp. 90-96 ◽  
Author(s):  
Andrea Raya Rey ◽  
Klemens Pütz ◽  
Gabriela Scioscia ◽  
Benno Lüthi ◽  
Adrián Schiavini
Keyword(s):  
Foraging Behaviour ◽  
Sexual Differences ◽  
Magellanic Penguins

scholarly journals Evidence of links between haematological condition and foraging behaviour in northern gannets ( Morus bassanus )

2020 ◽  
Vol 7 (5) ◽  
pp. 192164 ◽  
Author(s):  
Z. Malvat ◽  
S. A. Lynch ◽  
A. Bennison ◽  
M. Jessopp
Keyword(s):  
Blood Cell ◽  
Foraging Behaviour ◽  
Foraging Ecology ◽  
Isotope Analysis ◽  
Haematological Parameters ◽  
Free Living ◽  
Seabird Species ◽  
Cell Counts ◽  
Blood Cell Counts ◽  
Species Specific

Haematological analyses can reveal the physiological condition of birds, which are known to efficiently disguise symptoms of stress and disease. However, the interpretation of such analyses requires species-specific baseline data, which are lacking for most free-living seabird species. We provide baseline reference data for several haematological parameters in northern gannets ( Morus bassanus ) and combine this with telemetry and dietary data to understand the links between haematological condition and foraging behaviour. Blood samples were collected from breeding northern gannets in July 2017 ( n = 15) and 2018 ( n = 28), which were also equipped with GPS tags. Smears were prepared for performing blood cell counts, including immature erythrocyte and microcyte percentages, total and differential leucocyte counts, heterophil : lymphocyte (H : L) ratio and total thrombocyte count; the remaining blood was used for stable isotope analysis and foraging behaviours were inferred from the recovered tag data. Blood cell counts revealed that the sampled birds were highly stressed and some showed an immune response, evident from the abnormal leucocyte counts and the H : L ratio. There were no sex-related differences in haematological parameters or diet, in contrast to foraging parameters where females undertook longer trips than males and spent proportionately more time in search behaviours. The percentage time spent actively foraging was weakly negatively correlated with the percentage of eosinophils. While there was no direct link between haematological condition and diet, one bird feeding at a relatively low trophic level undertook exceptionally short foraging trips and showed abnormal blood cell counts. This suggests a link between haematological condition and foraging ecology that can be employed in assessing seabird health.

Foraging behaviour of Magellanic Penguins during the early chick-rearing period at Isla de los Estados, Argentina

Ibis ◽  
2017 ◽  
Vol 160 (2) ◽  
pp. 327-341 ◽  
Author(s):  
Natalia G. Rosciano ◽  
Klemens Pütz ◽  
Michael J. Polito ◽  
Andrea Raya Rey
Keyword(s):  
Foraging Behaviour ◽  
Magellanic Penguins

Electron Microscopy in the Study of Natural Phytoplankton Assemblages

1985 ◽  
Vol 43 ◽  
pp. 620-623
Author(s):  
Linda Sicko-Goad
Keyword(s):  
Electron Microscopy ◽  
Aquatic Environment ◽  
Size Range ◽  
Physical Parameters ◽  
Specific Information ◽  
Phytoplankton Assemblages ◽  
Phytoplankton Productivity ◽  
Ecosystem Effects ◽  
Time Of Year ◽  
Species Specific

Although the use of electron microscopy and its varied methodologies is not usually associated with ecological studies, the types of species specific information that can be generated by these techniques are often quite useful in predicting long-term ecosystem effects. The utility of these techniques is especially apparent when one considers both the size range of particles found in the aquatic environment and the complexity of the phytoplankton assemblages.The size range and character of organisms found in the aquatic environment are dependent upon a variety of physical parameters that include sampling depth, location, and time of year. In the winter months, all the Laurentian Great Lakes are uniformly mixed and homothermous in the range of 1.1 to 1.7°C. During this time phytoplankton productivity is quite low.

64: Rapid, Species-Specific Detection of Uropathogens from Clinical Urine Specimens Using an Electrochemical Microsensor Array

2005 ◽  
Vol 173 (4S) ◽  
pp. 18-18
Author(s):  
Joseph C. Liao ◽  
Mitra Mastali ◽  
David A. Haake ◽  
Bernard M. Churchill
Keyword(s):  
Specific Detection ◽  
Species Specific ◽  
Urine Specimens
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