منابع مشابه
Patterns of Stopover by Warblers during Spring and Fall Migration on Appledore Island, Maine
-Migrant warblers mist netted on Appledore Island, Maine, during spring and fall migration in 1990 and 199 1 allowed analysis of seasonal differences in stopover patterns, including recapture rates, stopover lengths, and changes in mass and fat during stopover. Northern Waterthrushes (Seiurus noveborucensis) and American Redstarts (Serophaga ruticilla) had higher recapture rates in the fall tha...
متن کاملinvestigating outdate spring migration among nomads of fars province
nomadâs livelihood is based on continuous migration between summer and winter pastures to obtain forage for their animals and access to contented weather. this living way has long history in iran which formed in accord with climate. in recent century, modernization has been caused many changes in traditional living way of nomads. therefore, nomads have no more their role and function as in th...
متن کاملInvestigating the Evolution of Spatial Structure Patterns of Migration in West-Azerbaijan Province
Migration and quality of redistribution of population across country is one of the main factors that planners take into account to control population and guide its movements to economic poles. Scientific recognition of migration phenomenon is important for managing and policy making in the country. These movements change migration pattern, in a way that along with increase in population and the...
متن کاملDeterminants of spring migration departure decision in a bat
Migratory decisions in birds are closely tied to environmental cues and fat stores, but it remains unknown if the same variables trigger bat migration. To learn more about the rare phenomenon of bat migration, we studied departure decisions of female common noctules (Nyctalus noctula) in southern Germany. We did not find the fattening period that modulates departure decisions in birds. Female n...
متن کاملSpring-migration Ecology of Northern Pintails in South-central Nebraska
—Spring-migration ecology of staging Northern Pintails, Anas acuta, was investigated in south-central Nebraska, USA. Habitat associations, local movements, settling patterns, arrival dates, residency times and survival were estimated from 71 radiomarked pintails during spring 2001, 2003 and 2004, and diet determined from 130 females collected during spring 1998 and 1999. Seventy-two percent of ...
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ژورنال
عنوان ژورنال: Nature
سال: 1953
ISSN: 0028-0836,1476-4687
DOI: 10.1038/171025a0