Results 151 to 160 of about 1,275 (185)
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Biological Invasions, 2017
Climate similarity favors biological invasion, but a match between seasonality in the novel range and the timing of life cycle events of the invader also influences the outcome of species introduction. Yet, phenology effects on invasion success have generally been neglected. Here we study whether a phenological mismatch limits the non-native range of a
Luna Alvaro +13 more
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Climate similarity favors biological invasion, but a match between seasonality in the novel range and the timing of life cycle events of the invader also influences the outcome of species introduction. Yet, phenology effects on invasion success have generally been neglected. Here we study whether a phenological mismatch limits the non-native range of a
Luna Alvaro +13 more
openaire +4 more sources
Islets of Langerhans in the parakeet, Psittacula krameri.
Anatomischer Anzeiger, 1980The pancreatic gland of Psittacula krameri is divisible into 4 lobes i.e. dorsal, ventral, third and splenic. The endocrine part is composed of alpha 1-, alpha 2- and beta-cells. The islets are of 4 kinds viz., alpha islets (having alpha 1- and alpha 2-cells), beta islets (having beta- and alpha 1-cells), pure beta islets (consisting of beta-cells ...
Y K, Gupta, S, Kumar
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Primary structure of the hemolglobin β-chain of Rose-ringed Parakeet (Psittacula krameri)
Journal of Protein Chemistry, 1989The primary structure of Rose-ringed Parakeet hemoglobin beta-chain was established, completing the analysis of this hemoglobin. Comparison with other avian beta-chains show variations smaller than those for the corresponding alpha-chains. There are 11 amino acid exchanges in relationship to the only other characterized psittaciform beta-chain, and a ...
A, Islam +3 more
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Primary structure of the hemoglobin α-chain of rose-ringed parakeet (Psittacula krameri)
Journal of Protein Chemistry, 1988The structure of the hemoglobin alpha-chain of Rose-ringed Parakeet was determined by sequence degradations of the intact subunit, the CNBr fragments, and peptides obtained by digestion with staphylococcal Glu-specific protease and trypsin. Using this analysis, the complete alpha-chain structure of 21 avian species is known, permitting comparisons of ...
A, Islam +4 more
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Invasion of Psittacula krameri in Gauteng, South Africa: are other birds impacted?
Biodiversity and Conservation, 2019Anthropogenic activities have resulted in the dispersal of many species beyond their natural range and there is ongoing concern over their impacts on native ecosystems. However, these interactions are hard to disentangle from the effect of human-driven habitat alterations.
Ielyzaveta M. Ivanova, Craig T. Symes
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Seasonal effects on the thermoregulation of invasive rose-ringed parakeets (Psittacula krameri)
Journal of Thermal Biology, 2013Abstract Invasive species are a major threat to global biodiversity. Rose-ringed parakeets Psittacula krameri are widely established outside their native range and are successful invaders in many countries, including South Africa. Physiological and behavioral responses to environmental conditions are considered to be major factors that influence ...
Vuyisile Thabethe +4 more
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Foot preferences in wild-living ring-necked parakeets (Psittacula krameri, Psittacidae)
Laterality: Asymmetries of Body, Brain and Cognition, 2011Evidence for foot preferences has been reported in parrots and the majority of parrot species uses the left foot to hold and process food objects. Here we assessed the footedness of ring-necked parakeets (Psittacula krameri) in a wild-living non-native population in Heidelberg, Baden-Wurttemberg, Germany.
Christoph, Randler +2 more
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A case report of vascular hamartoma in a rose-ringed parakeet (Psittacula krameri)
Journal of Poultry Sciences and Avian DiseasesVascular hamartomas, though rare, can manifest in avian species, presenting diagnostic intricacies for clinicians. A 12-year-old male rose-ringed parakeet presented with a mass between the upper and lower mandibular angles on the left side. The mass was surgically removed.
Reza Kheirandish +3 more
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Effects of the Recent World Invasion by Ring-Necked Parakeets Psittacula krameri
2015Over 60 out of 355 currently living parrot species have established at least one breeding population outside their natural distribution ranges. Among those, the ring-necked parakeet is one of the most successful invaders. This species is a gregarious Afro-Asian parakeet with an extremely large distribution range, recorded in over 35 countries outside ...
Mattia Menchetti +2 more
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