scholarly journals Vocal individuality cues in the African penguin (Spheniscus demersus): a source-filter theory approach

2015 ◽  
Vol 5 (1) ◽  
Author(s):  
Livio Favaro ◽  
Marco Gamba ◽  
Chiara Alfieri ◽  
Daniela Pessani ◽  
Alan G. McElligott
Keyword(s):  
Theory Approach ◽  
Filter Theory ◽  
Vocal Individuality ◽  
Spheniscus Demersus ◽  
African Penguin

scholarly journals Capillary Electrophoresis Assessment of Plasma Protein Changes in an African Penguin (Spheniscus demersus) With Aspergillosis

ACS Omega ◽  
2020 ◽  
Vol 5 (51) ◽  
pp. 33280-33289
Author(s):  
Anddre Osmar Valdivia ◽  
Kristen Jasmin Ortega ◽  
Sanjoy K. Bhattacharya ◽  
Carolyn Cray
Keyword(s):  
Capillary Electrophoresis ◽  
Plasma Protein ◽  
Spheniscus Demersus ◽  
African Penguin

Genetic monitoring of ex situ African Penguin (Spheniscus demersus) populations in South Africa

2016 ◽  
Vol 51 (2) ◽  
pp. 83-90 ◽  
Author(s):  
Christiaan Labuschagne ◽  
Lisa Nupen ◽  
Antoinette Kotzé ◽  
J Paul Grobler ◽  
Desiré L Dalton
Keyword(s):  
South Africa ◽  
Genetic Monitoring ◽  
Ex Situ ◽  
Spheniscus Demersus ◽  
African Penguin

scholarly journals Parasite diversity associated with African penguins (Spheniscus demersus) and the effect of host and environmental factors

Parasitology ◽  
2019 ◽  
Vol 146 (6) ◽  
pp. 791-804 ◽  
Author(s):  
Marcela P. A. Espinaze ◽  
Cang Hui ◽  
Lauren Waller ◽  
Francois Dreyer ◽  
Sonja Matthee
Keyword(s):  
Environmental Factors ◽  
Nest Density ◽  
Western Coast ◽  
Helminth Parasites ◽  
Limited Information ◽  
Parasite Diversity ◽  
Critically Endangered Species ◽  
Temperature And Precipitation ◽  
Spheniscus Demersus ◽  
African Penguin

AbstractThe African penguin (Spheniscus demersus) is a critically endangered species endemic to southern Africa. Limited information is available on the parasite diversity associated with the species in natural settings. This study explores the diversity and incidence of parasites associated with African penguins and their nests, and records the effect of host and environmental factors on parasite infestation. Ecto-, haemo- and helminth parasites were recorded from 210 adult birds, 583 chicks and 628 nests across five colonies (two mainland and three islands) along the south-western coast of South Africa, in 2016 and 2017. Mean nest density (total and active nests) and climate variables (temperature and precipitation) were obtained for each colony. Parapsyllus humboldti was the most abundant and prevalent ectoparasite on penguins and in nests (69.10 and 57.80%, respectively), while Piroplasmorida/Haemospororida (33.51%) and Cardiocephaloides spp. (56.17%) were the most prevalent haemo- and helminth parasites of penguins, respectively. In general parasite abundance and prevalence was significantly affected by penguin age (chicks vs adults), location (mainland vs islands), nest density (total and active nests) and season (spring vs autumn/winter). It is concluded that parasite infestations are structured and that penguin chicks at mainland colonies are more susceptible to parasite infestations during spring.

FACTORS AFFECTING ABNORMAL MOLTING IN THE MANAGED AFRICAN PENGUIN (SPHENISCUS DEMERSUS) POPULATION IN NORTH AMERICA

2020 ◽  
Vol 50 (4) ◽  
pp. 917
Author(s):  
Matthew Golembeski ◽  
Samantha J. Sander ◽  
Jennifer Kottyan ◽  
William E. Sander ◽  
Ellen Bronson
Keyword(s):  
North America ◽  
Factors Affecting ◽  
Spheniscus Demersus ◽  
African Penguin

The heterothermic loophole exploited by penguins

2007 ◽  
Vol 55 (5) ◽  
pp. 317 ◽  
Author(s):  
Daniel B. Thomas ◽  
R. Ewan Fordyce
Keyword(s):  
Body Size ◽  
Axillary Artery ◽  
Retention System ◽  
Spheniscus Demersus ◽  
African Penguin ◽  
Size Threshold ◽  
Counter Current ◽  
Lower Size ◽  
Insight Into ◽  
Current Heat

Penguins are generally smaller than the predicted minimum body size for marine endotherms. Anatomical observations of the little blue penguin (Eudyptula minor) suggest that extant penguins actively defeat the lower size threshold using regional heterothermy. The wing arteries in the little blue penguin form a humeral plexus, a series of three parallel arteries (including the marginal artery) that stem from the axillary artery, replacing a single brachial artery. Each artery of the plexus is associated with at least two veins to form a counter current heat-retention system. The humeral plexus thus restricts heat from entering distal areas of the wing and dissipating into seawater, ultimately reducing the bulk mass required for heat production and insulation. Humeral plexi are confirmed as a synapomorphic character of the Spheniscinae, with the humeral plexus of E. minor most similar to that of the African penguin Spheniscus demersus. The humeral plexus represents a loophole in body size minima of marine endotherms and offers insight into the ecology of living penguins.

Isolation and characterization of SNP markers for African Penguin (Spheniscus demersus)

2012 ◽  
Vol 4 (4) ◽  
pp. 1067-1069 ◽  
Author(s):  
Christiaan Labuschagne ◽  
Desiré L. Dalton ◽  
Antoinette Kotzé
Keyword(s):  
Snp Markers ◽  
Isolation And Characterization ◽  
Spheniscus Demersus ◽  
African Penguin
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