Territory acquisition mediates the influence of predators and climate on juvenile red squirrel survival ...

• Main Authors: Hendrix, Jack G, Fisher, David, Martinig, April, Boutin, Stan, Dantzer, Ben, Lane, Jeffrey, McAdam, Andrew
• Format: Dataset
• Language: English
• Published: Dryad 2020
• Subjects: juvenile survival; life history timing; Lynx; mustelid; red squirrel; Tamiasciurus; territory; overwinter survival; Yukon
• Online Access: https://dx.doi.org/10.5061/dryad.q2bvq83g0; https://datadryad.org/stash/dataset/doi:10.5061/dryad.q2bvq83g0

1) Juvenile survival to first breeding is a key life history stage for all taxa. Survival through this period can be particularly challenging when it can coincide with harsh environmental conditions such as a winter climate or food scarcity, leading to highly variable cohort survival. However, the small size and dispersive nature of juveniles generally makes studying their survival more difficult. 2) In territorial species, a key life history event is the acquisition of a territory. A territory is expected to enhance survival, but how it does so is not often identified. We tested how the timing of territory acquisition influenced the winter survival of juvenile North American red squirrels Tamiasciurus hudsonicus, hereafter red squirrels, and how the timing of this event mediated sources of mortality. We hypothesized that securing a territory prior to when food resources become available would reduce juvenile susceptibility to predation and climatic factors over winter. 3) Using 27 years of data on the ... : A population of red squirrels in the southwest Yukon has been monitored since 1989. We used reproductive and survival data from this population, along with data on predator abundance and weather conditions, to measure survival of juveniles that were alive at the end of the summer in the year of their birth. ...