Data and R computer code from: Summer elk calf survival in a partially migratory population

These data and computer code (written in R, https://www.r-project.org)
were created to statistically evaluate a suite of intrinsic and extrinsic
risk factors related to calf elk and their mothers' body condition
and age. Specifically, known-fate data were collected from 94 elk calves
monitored from 2013-2016 in a partially migratory elk (Cervus canadensis)
population in Alberta, Canada. Along with adult female data on pregnancy
status, age, and body condition, we created a time-to-event dataset that
allowed us to analyze calf mortality risk in a time-to-event approach. We
also estimated pooled survivorship and cause-specific mortality, as well
as stratifying these metrics by migration tactic (resident vs. eastern
migrant). Cox proportional hazards models were used to evaluate calf
mortality risk in terms of forage biomass (kg/ha), bear predation risk
(from an RSF), and other factors that varied between migration tactics. We
tested for differences in a number of maternal reproductive parameters
(e.g., pregnancy status) and for calf explanatory variables between
migrant and resident elk segments. We also use cumulative incidence
functions to estimate cause-specific mortality in this multiple carnivore
system. Ultimately, we hope that this work helps wildlife managers
anticipate how elk calf survival and partial migration dynamics are
affected by grizzly bear predation, and our study builds on a long-term
partial migration study at the Ya Ha Tinda Ranch in Alberta,
Canada.