Population Fluctuation of Pygoscelis Papua and Pygoscelis Antarctica, Elephant Island, South Shetlands, Antarctica
نویسندگان
چکیده
منابع مشابه
A Novel Adenovirus in Chinstrap Penguins (Pygoscelis antarctica) in Antarctica
Adenoviruses (family Adenoviridae) infect various organ systems and cause diseases in a wide range of host species. In this study, we examined multiple tissues from Chinstrap penguins (Pygoscelis antarctica), collected in Antarctica during 2009 and 2010, for the presence of novel adenoviruses by PCR. Analysis of a 855-bp region of the hexon gene of a newly identified adenovirus, designated Chin...
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The West Antarctic Peninsula (WAP) has been suffering an increase in its atmospheric temperature during the last 50 years, mainly associated with global warming. This increment of temperature trend associated with changes in sea-ice dynamics has an impact on organisms, affecting their phenology, physiology and distribution range. For instance, rapid demographic changes in Pygoscelis penguins ha...
متن کاملDeterminants of Feeding Chases in the Chinstrap Penguin Pygoscelis antarctica
Feeding interactions between parents and chicks in pygoscelid penguins are frequently associated with chases. We tested alternative predictions derived trom two functional hypotheses proposed to explain feeding chases: (1) the harassment of the parent by two begging, competing chicks is stressful and makes the parent run away to avoid stress (‘harassment avoidance hypothesis’) and (2) chases ar...
متن کاملShort Note: Cryptosporidium spp. oocysts detected using acid-fast stain in faeces of gentoo penguins ( Pygoscelis papua) in Antarctica
Cryptosporidium is considered to be one of the indicators of environmental contamination and water quality (Garcia 2001, Fayer 2004, Ramirez & Sreevatsan 2006). At the present time the presence of this parasite has been recorded on all the continents, including Antarctica (Fredes et al. 2007a). Since the first description of Cryptosporidium by Tyzzer in 1912, 14 new species of this parasite hav...
متن کاملEffects of variability in prey abundance on reproduction and foraging in chinstrap penguins (Pygoscelis antarctica)
Life-history theory predicts that adults of long-lived species such as seabirds should optimally balance investment in current and future offspring. However, when trying to optimize investment in offspring provisioning, the most energetically costly component of seabird parental care, adults need to contend with large interannual fluctuations in prey availability and hence the cost of chick pro...
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ژورنال
عنوان ژورنال: INCT-APA Annual Activity Report
سال: 2012
ISSN: 2177-918X
DOI: 10.4322/apa.2014.068