منابع مشابه
Fitness-related parameters improve presence-only distribution modelling for conservation practice: The case of the red-backed shrike
The red-backed shrike (Lanius collurio L.) is a bird living in human-altered agricultural areas that are managed by extensive farming techniques. This passerine species has declined significantly in Western Europe over the last 30–40 years. The development of efficient species-specific conservation strategies relies on fine-grained information about the ecological resources and environmental co...
متن کاملImpact of Nesting Mortality on Avian Breeding Phenology: A Case Study on the Red-Backed Shrike (Lanius collurio)
The seasonal timing of avian reproduction is supposed primarily to coincide with favourable feeding conditions. Long-term changes in avian breeding phenology are thus mostly scrutinized in relation to climatic factors and matching of the food supplies, while the role of nesting mortality is largely unexplored. Here we show that higher seasonal mean daily mortality rate leads to a shift in the d...
متن کاملSettling Decisions and Heterospecific Social Information Use in Shrikes
Animals often settle near competitors, a behavior known as social attraction, which belies standard habitat selection theory. Two hypotheses account for these observations: individuals obtain Allee benefits mediated by the physical presence of a competitor, or they use successfully settled individual as a source of information indicating the location of high quality habitat. We evaluated these ...
متن کاملHistological Study of the Oesophagus and Stomach in Grey-Backed Shrike (Lanius tephronotus)
The microstructure of oesophagus and stomach in grey-backed shrike were examined by means of light microscopy. The results showed that the oesophagus glands were mucous glands, the shedding glandular cells and the mucin from the oesophagus glands secreted to the lumen. The number of the glands in the thoracic part was less than that of in the cervical part. The lumens of the glands showed an in...
متن کاملSeasonal variation of myoglobin in the northern red-backed vole.
MORRISON, PETER, MARIO ROSENMANN, AND JOHN A. SEALANDER. Seasonal variation of myoglobin in the northern redbacked vole. Am. J. Physiol. 2 I I (6) : 1305-1308. 1966.-A marked increase in myoglobin concentration was observed in thigh muscle (I. 3 -+ 3.2 mg/g) and masseter (4.7 -+ 10.1 mg/g) from northern red-backed voles (Clethrionomys rutilus dawsoni) during winter (Jan.-Feb.) as compared with ...
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ژورنال
عنوان ژورنال: Nature
سال: 1948
ISSN: 0028-0836,1476-4687
DOI: 10.1038/162504a0