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Hare disturbance GPS data

Citation

Mayer, Martin; Haugaard, Lars; Sunde, Peter (2021), Hare disturbance GPS data, Dryad, Dataset, https://doi.org/10.5061/dryad.j0zpc86fb

Abstract

Capture and handling of wildlife is an important component of wildlife studies, and hunting can be a central tool for wildlife management. However, human-caused disturbance of animals can cause various negative effects on individuals. Thus, an increased understanding of different disturbances on animals will allow improved mitigation of human stressors for wildlife, and provides the basis for data‐censoring when using information obtained from captured individuals. Here, we investigated the effects of capture and handling, as well as experimental disturbance, on the movement behavior of GPS-collared European hares (Lepus europaeus). Of 28 hares captured in box traps, 3 died during handling to fit GPS collars, likely due to acute stress. Apart from an 11% decrease in activity in both sexes the first 4 days post-capture compared to later, capture events had no significant effects on subsequent movement behavior. Hares that were disturbed experimentally, i.e. flushed with or without a shotgun shot fired, moved on average (± SD) 422 ± 206 m directly subsequent to the disturbance, leading to a spatial displacement of their short-term home range and an increased daily home range size on the disturbance day. Home range sizes returned to their pre-disturbance size on the following days, but hares remained further from field edges and spent more time in short vegetation in the days after simulated hunting, though this effect was comparatively small. Overall, our findings indicate that hares only marginally changed their movement behavior in response to short-term disturbances. Therefore, capture and hunting disturbance should not have severe negative effects on the movement behavior of individuals, but future studies should aim to reduce acute capture-related stress to avoid mortalities. We recommend that researchers should censor the first 4 days post-capture from their analyses to avoid using potentially biased data.

Methods

We captured 28 hares (10 females and 18 males) in spring and summer 2014, 2018 and 2019, using box traps, and collared these hares with GPS units. GPSs recorded one-hourly GPS positions throughout the day in 2014 and 2018, and one position every 15 min in 2019.

Disturbance experiments were conducted in 2018 and 2019, using 12 GPS-collared hares, 6 in 2018 and 6 in 2019. We distinguished between 4 disturbance types (Table 1): (1) ‘control’, which we arbitrarily assigned to days without any known disturbance, (2) ‘data download’, in which one or two observers downloaded GPS data from the hares’ GPS collar using a UHF beacon. (3) ‘Flushed without shot’: two observers approached a hare using the UHF beacon of the GPS collar, homing in on the hare until it fled. (4) ‘Flushed and shot fired’: two observers approached a hare using the UHF beacon, homing in on the hare and fired a shotgun shot in the air when the hare escaped, simulating a hunting situation.

Usage Notes

The data 'Hare_capture_effects_data' shows the identifier of each hare ('hare'), the date and local time, the latitude and longitude, day of the year (DOY), sex, the number of days after capture, distance moved between consecutive GPS positions ('dist_moved'), and the distance of each GPS poisition from the closest field edge ('dist_to_field_edge').

The data 'Hare_disturbance_experiment_data' shows the same columns as described above, but addtionally shows the distubance experiment ID ('Exp_ID'), the fix rate, the period (pre, experiment day, post), the time when the hare was disturbed ('time_disturbed') and whether the hare fled ('fled'), the disturbance type ('Distrurbance'), and the vegetation height ('Veg_height').

Both files show raw GPS data.