California sea lion pup survey, San Miguel Island, California.

Source: R/datasets_erddap.R

California sea lion pups are counted at San Miguel Island, California. Live pups are counted at the end of July each year, after all pups have been born. Pups are weighed in September or October each year and weights are adjusted using a mixed effects model to a 1 October weighing date. Growth rates are predicted from a longitudinal sample of uniquely marked pups that are captured in October and again the following February. Growth rates are modeled using a mixed effects model and standard errors are estimated using bootstrap

cciea_MM_pup_count

Format

A data frame with 137 rows and 5 variables:

time

Time (seconds since 1970-01-01T00:00:00Z) [8.520768E8, 1.5778368E9]

live_pup_count

Sea lion pup count, San Miguel Isl. (count) [9428.0, 27148.0]

live_pup_count_se

Sea lion pup count standard error, San Miguel Isl. (count) [51.99038, 719.5551]

mean_weight

Female sea lion pup weight index (kg) [11.95362, 20.63407]

mean_weight_se

Female sea lion pup weight index standard error (kg) [0.1044493, 0.1937013]

mean_growth_rate

Female sea lion pup growth rate (kg/day) [0.01268848, 0.09503055]

mean_growth_rate_se

Female sea lion pup growth rate standard error (kg/day) [0.001847422, 0.01116279]