Spring MIgration
نویسندگان
چکیده
منابع مشابه
investigating 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 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 ...
متن کاملSexual size dimorphism and timing of spring migration in birds.
Sexually selected traits are limited by selection against those traits in other fitness components, such as survival. Thus, sexual selection favouring large size in males should be balanced by higher mortality of larger males. However, evidence from red-winged blackbirds (Agelaius phoeniceus) indicates that large males survive better than small males. A survival advantage to large size could re...
متن کاملDiets of Lesser Scaup during Spring Migration throughout the Upper-Midwest are Consistent with the Spring Condition Hypothesis
— The spring condition hypothesis (SCH) states that the current decline of the North American scaup population (Lesser [ Aythya affinis ] and Greater Scaup [ A. marila ] combined) is due to a decline in quality or availability of scaup foods on wintering, spring migration, or breeding areas that has caused a reduction in female body condition and subsequent reproductive success. Our previous re...
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ژورنال
عنوان ژورنال: Blue Jay
سال: 1953
ISSN: 2562-5667,0006-5099
DOI: 10.29173/bluejay1418