Data from: Refuge or predation risk? Alternate ways to perceive hiker disturbance based on maternal state of female caribou
Lesmerises, Frederic, Center for Northern Studies
Johnson, Chris J., University of Northern British Columbia
St-Laurent, Martin-Hugues, Center for Northern Studies
Published Nov 22, 2017 on Dryad.
Cite this dataset
Lesmerises, Frederic; Johnson, Chris J.; St-Laurent, Martin-Hugues (2017). Data from: Refuge or predation risk? Alternate ways to perceive hiker disturbance based on maternal state of female caribou [Dataset]. Dryad. https://doi.org/10.5061/dryad.ff6d4
Human presence in natural environments is often a source of stress that is perceived by large ungulates as an increased risk of predation. Alternatively, disturbance induced by hikers creates a relatively predator-free space that may serve as a refuge. We measured the behavioral responses of female caribou to disturbance associated with the presence of hikers during summer in the Gaspésie National Park. We used those data to determine whether caribou responded negatively to human activity (i.e., the predation risk hypothesis) or whether human activity resulted in a decrease in the magnitude of perceived risk (i.e., the refuge hypothesis). Female caribou with a calf spent nearly half of their time feeding, regardless of the presence of a trail or the number of hikers. They also decreased their vigilance near trails when the number of hikers increased. Conversely, lone females fed less frequently and almost doubled the time invested in vigilance under the same circumstances. However, both groups of females moved away from trails during the day, especially in the presence of hikers. We demonstrated that risk avoidance was specific to the maternal state of the individual. Lactating females accommodated the presence of hikers to increase time spent foraging and nutritional intake, providing support for the refuge hypothesis. Alternatively, lone females with lower energetic requirements and no maternal investment in a vulnerable calf appeared less tolerant to risk, consistent with the predation risk hypothesis. Synthesis and applications: Hikers influenced the vigilance–feeding trade-off in caribou, underlining the importance of appropriate management of linear structures and human activities, especially across the critical habitat of endangered species. Even if some individuals seemed to benefit from human presence, this behavioral adaptation was not sufficient to reduce annual calf mortality associated with predation.
Focal observation for lone females
Number of seconds and proportion of time spent in a given behaviour during focal observations for lone females (without a calf).
Focal observation for females with a calf
Number of seconds and proportion of time spent in a given behaviour during focal observations for females accompanied by a calf.
Space use data for lone females
Data used in figure 2, i.e. frequency distribution of distances to a trail for telemetry locations for lone females (without a calf).
Space use data for females with a calf
Data used in figure 2, i.e. frequency distribution of distances to a trail for telemetry locations for suited females (accompanied by a calf).