TY - JOUR
T1 - Seasonal and predator-prey effects on circadian activity of free-ranging mammals revealed by camera traps
AU - Caravaggi, Anthony
AU - Gatta, Maria
AU - Vallely, Marie-Claire
AU - Hogg, Kayleigh
AU - Freeman, Marianne
AU - Fadaei, Erfan
AU - Dick, Jaime T. A.
AU - Montgomery, W. Ian
AU - Reid, Neil
AU - Tosh, David G.
PY - 2018/11/21
Y1 - 2018/11/21
N2 - Endogenous circadian and seasonal activity patterns are adapted to facilitate effective utilisation of environmental resources. Activity patterns are shaped by physiological constraints, evolutionary history, circadian and seasonal changes and may be influenced by other factors, including ecological competition and interspecific interactions. Remote sensing camera traps allow the collection of species presence data throughout the 24-hour period, and for almost indefinite periods. Here, we collate data from ten separate camera trap surveys in order to describe circadian and seasonal activity patterns of ten mammal species, and, in particular, to evaluate interspecific (dis)associations of five predator-prey pairs. We recorded 8,761 independent detections throughout Northern Ireland. Badgers, foxes, pine martens and wood mice were nocturnal; European and Irish hares and European rabbits were crepuscular; fallow deer and grey and red squirrels were diurnal. All species exhibited significant seasonal variation in activity relative to the timing of sunrise/sunset. Foxes in particular, were more crepuscular from spring to autumn and hares more diurnal. Lagged regression analyses of predator-prey activity patterns between foxes and prey (hares, rabbits and wood mice), and pine marten and prey (squirrel and wood mice) revealed significant annual and seasonal cross-correlations. We found synchronised activity patterns between foxes and hares, rabbits and wood mice and pine marten and wood mice, and asynchrony between squirrels and pine martens. Here, we provide fundamental ecological data on endemic, invasive, pest and commercially valuable species in Ireland, as well as those of conservation importance and those that could harbour diseases of economic and/or zoonotic relevance. Our data will be valuable in informing the development of appropriate species-specific methodologies and processes and associated policies.
AB - Endogenous circadian and seasonal activity patterns are adapted to facilitate effective utilisation of environmental resources. Activity patterns are shaped by physiological constraints, evolutionary history, circadian and seasonal changes and may be influenced by other factors, including ecological competition and interspecific interactions. Remote sensing camera traps allow the collection of species presence data throughout the 24-hour period, and for almost indefinite periods. Here, we collate data from ten separate camera trap surveys in order to describe circadian and seasonal activity patterns of ten mammal species, and, in particular, to evaluate interspecific (dis)associations of five predator-prey pairs. We recorded 8,761 independent detections throughout Northern Ireland. Badgers, foxes, pine martens and wood mice were nocturnal; European and Irish hares and European rabbits were crepuscular; fallow deer and grey and red squirrels were diurnal. All species exhibited significant seasonal variation in activity relative to the timing of sunrise/sunset. Foxes in particular, were more crepuscular from spring to autumn and hares more diurnal. Lagged regression analyses of predator-prey activity patterns between foxes and prey (hares, rabbits and wood mice), and pine marten and prey (squirrel and wood mice) revealed significant annual and seasonal cross-correlations. We found synchronised activity patterns between foxes and hares, rabbits and wood mice and pine marten and wood mice, and asynchrony between squirrels and pine martens. Here, we provide fundamental ecological data on endemic, invasive, pest and commercially valuable species in Ireland, as well as those of conservation importance and those that could harbour diseases of economic and/or zoonotic relevance. Our data will be valuable in informing the development of appropriate species-specific methodologies and processes and associated policies.
KW - Temporal co-occurrence
KW - Wildlife
KW - Seasonality
KW - Citizen science
KW - Camera traps
KW - Circadian activity
KW - Mammal species
U2 - 10.7717/peerj.5827
DO - 10.7717/peerj.5827
M3 - Article
C2 - 30498626
VL - 6
JO - PeerJ
JF - PeerJ
SN - 2167-8359
M1 - e5827
ER -