3 results
Search Results
2. Autumn temperatures at African wintering grounds affect body condition of two passerine species during spring migration.
- Author
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Aloni, Irith, Markman, Shai, and Ziv, Yaron
- Subjects
MIGRATORY birds ,SPRING ,BIRD migration ,TEMPERATURE ,AUTUMN ,ANIMAL behavior ,SPECIES - Abstract
Most papers on the physical condition of birds during spring migration focused on food availability preceding migratory take-off. Only a few studies examined the effect of climate conditions at the wintering grounds upon autumn arrival on bird physical condition later on. Here, we hypothesized that environmental conditions upon arrival at the wintering grounds, and not necessarily upon departure, have a crucial carry-over effect on bird spring migration. Using 29,000 observations of the lesser whitethroat, Sylvia curruca, and the eastern Bonelli’s warbler, Phylloscopus orientalis, we found temperatures upon arrival at the African wintering grounds to be the only climatic variable correlated with birds’ body state upon spring stopover in Israel, six months later. Two different mechanisms could explain these results. One possibility is that high temperatures create favorable conditions for insect activity, which allows rapid recovery from autumn migration and hence successful winter survival and maintenance. Another possible scenario is that harsh conditions, due to the heat and dry environment, cause high mortality, permitting survival of larger individuals which, then, enjoy reduced inter- and intra-specific competition. Whatever the mechanism is, our findings suggest that conditions upon autumn arrival, and not necessarily at the end of winter as traditionally thought, may have a major impact on migrating birds. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
3. Let the sunshine in? The effects of luminance on economic preferences, choice consistency and dominance violations
- Author
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Agnieszka Tymula and Paul W. Glimcher
- Subjects
Male ,0301 basic medicine ,Atmospheric Science ,Financial Management ,Light ,Social Sciences ,lcsh:Medicine ,050109 social psychology ,Choice Behavior ,Luminance ,Cognition ,0302 clinical medicine ,Medicine and Health Sciences ,Econometrics ,Psychology ,050207 economics ,Duration (project management) ,lcsh:Science ,media_common ,Aged, 80 and over ,Multidisciplinary ,Physics ,Electromagnetic Radiation ,05 social sciences ,Brain ,Ambiguity ,Middle Aged ,Physical Sciences ,Sunlight ,Female ,Seasons ,Anatomy ,Research Article ,Adult ,Visible Light ,media_common.quotation_subject ,Decision Making ,Hypothalamus ,Affect (psychology) ,Age and gender ,Young Adult ,03 medical and health sciences ,Risk-Taking ,Meteorology ,Consistency (negotiation) ,Clouds ,0502 economics and business ,Autumn ,Humans ,0501 psychology and cognitive sciences ,Weather ,Aged ,Motivation ,Winter ,Financial market ,lcsh:R ,Cognitive Psychology ,Biology and Life Sciences ,030104 developmental biology ,13. Climate action ,Dominance (economics) ,Earth Sciences ,Cognitive Science ,lcsh:Q ,030217 neurology & neurosurgery ,Neuroscience - Abstract
Weather, in particular the intensity and duration of sunshine (luminance), has been shown to significantly affect financial markets. Yet, because of the complexity of market interactions we do not know how human behavior is affected by luminance in a way that could inform theoretical choice models. In this paper, we use data from a field study using an incentive-compatible, decision task conducted daily over a period of two years and from the US Earth System Research Laboratory luminance sensor to investigate the impact of luminance on risk preferences, ambiguity preferences, choice consistency and dominance violations. We find that luminance levels affect all of these. Age and gender influence the strength of some of these effects.
- Published
- 2017
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