DOI: 10.5061/dryad.1m54f
title: Data from: Individual behaviour mediates effects of warming on movement across a fragmented landscape

description: Global warming and habitat fragmentation impose dramatic and potentially
 interactive impacts on ecosystems. Warming induces shifts in species'
 distributions as they track temperature changes, but this can be hindered
 in fragmented landscapes. Corridors connecting habitat patches might
 ameliorate the combined effects of fragmentation and global warming. Using
 novel automated tracking methods, the movement of woodlice (Oniscus
 asellus) ranging in body size from 15·3 to 108·6 mg was quantified across
 a temperature range from 15 to 25 °C as they moved around an experimental
 fragmented landscape. We used confirmatory path analysis to test causal
 effects of temperature and body size on individual movement and corridor
 crossing rates between two habitat patches. Results showed that woodlice
 behaved differently in corridors than patches by moving, on average,
 faster and more often. This is congruent with natural systems where
 corridors generally provide lower quality habitat than patches. Although
 metabolic theory suggests positive scaling of movement with body
 temperature (up to a peak) and body size, we found that corridor crossing
 rate was (i) not directly affected by body size and (ii) negatively
 influenced by temperature, possibly due to its indirect effects via
 humidity. Our path model revealed that metabolic scaling could only
 explain temperature effects on maximum body velocity, but decision-based
 behaviour explained most variation in corridor crossing rates. This led to
 direct and indirect effects of temperature and size on individual movement
 between habitat patches. Our findings suggest that increasing mean global
 temperatures, coupled with increasing habitat fragmentation, could have
 synergistic negative impacts on populations through a combination of
 physiological and behavioural factors that mediate individual responses to
 temperature and fragmentation.
description: Data used for
 constructing the path modelThis data set includes
 automatically tracked movement data from 45 recorded trials of woodlice in
 an experimental fragmented landscape at different temperatures. 'body
 size' is the body mass in milligrams of the animal;
 'temperature' gives the recorded temperature in degrees Celsius
 of the climate chamber where the trials were conducted and
 'humidity' is given as a percentage; 'corridor
 crossing' is the number of complete crossings into the adjacent patch
 by the woodlice during a trial and 'corridor encounter' gives
 the number of times the woodlice crossed one threshold but did not cross
 the other into the adjacent patch; 'mean velocity' is the
 average speed in mm/s, 'max velocity' is the maximum speed moved
 in mm/s, and 'prop time moving' is the proportion of time that
 the woodlice spent moving during the trial period.Barnes et al_data
 2.csvdata describing the use
 of the different habitats by woodlice within the experimental
 landscapeThis spreadsheet
 provides data collected from automated tracking of woodlice around an
 experimental fragmented landscape across different temperatures. Here, the
 data specifically provides the 'max velocity' (maximum speed
 moved in mm/s), 'mean velocity' (average speed moved in mm/s),
 'proportion time moving' (proportion of the total trial time
 that the woodlice spent moving), and 'time moving' (actual total
 time the the woodlice spent moving) within each of the three so-called
 "habitats" (i.e., the corridor and the two habitat patches).
 These three habitats are indicated in the column entitled
 'location'.Barnes et al_data
 1.csv