Abstract：
:Natural cycles of light and darkness shift the balance of risks and gains for animals across space and time. Entrainment to photic cycles allows animals to spatiotemporally adapt their behavioural and physiological processes in line with interplaying ecological factors, such as temperature, foraging efficiency and predation risk. Until recently, our understanding of these chronobiological processes was limited by the difficulties of 24 h observations. Technological advances in GPS biotelemetry however are now allowing us unprecedented access to long-term, fine-scale activity data. Here we use data derived from frontline technology to present the first large-scale investigation into the effects of natural fluctuations of light and darkness on the locomotor activity patterns of a threatened African mega-herbivore, the giraffe (Giraffa spp.). Using data from a remote population of Angolan giraffe (G. g. angolensis) in the northern Namib Desert, Namibia, we reveal the first full picture of giraffe chronobiology in a landscape of fear. Furthermore, we present clear evidence of the effect of moonlight on the nocturnal activity patterns of large ungulates. Our results are in line with recent research demonstrating that, rather than a fixed internal representation of time (circadian clock), many surface-dwelling ungulates have plastic activity patterns that are vulnerable to modification by external factors including light and temperature. Relatedly, we highlight important conservation management implications of rising temperatures and increasing light pollution on the chronobiology of surface-dwelling mammals.
journal_name
Behav Processesjournal_title
Behavioural processesauthors
Hart EE,Fennessy J,Hauenstein S,Ciuti Sdoi
10.1016/j.beproc.2020.104178subject
Has Abstractpub_date
2020-09-01 00:00:00pages
104178eissn
0376-6357issn
1872-8308pii
S0376-6357(20)30088-7journal_volume
178pub_type
杂志文章abstract：:Short-term (within-session) and long-term (between-session) habituation of exploratory behavior was studied in rats, hamsters and gerbils. Subjects were observed in an open field containing four different objects during three 15-min sessions with an 8-14 h interval between each session. Their exploratory activity was ...
journal_title：Behavioural processes
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journal_title：Behavioural processes
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journal_title：Behavioural processes
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journal_title：Behavioural processes
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journal_title：Behavioural processes
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更新日期：2017-09-01 00:00:00
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journal_title：Behavioural processes
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journal_title：Behavioural processes
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