humpback_params: Humpback whale parameters to use in ship-strike analysis

In ericmkeen/shipstrike: Utilities for spatially- and temporally-explicit predictions of whale-ship collisions

Humpback whale parameters to use in ship-strike analysis

Description

A list of parameters used for humpback whales in the analyses within Keen et al. (2023). These parameters include all the details needed to estimate close-encounter rates and predictions of whale-vessel interaction rates and collisions. You can use these same values to get started in setting up your analysis, then use this function to modify the values to fit your specific study.

Usage

humpback_params(
  length_min = 8.25,
  length_max = 15.5,
  length_mean = 11.85,
  length_sd = 1.32,
  width_factor = 0.33,
  speed_day_min = 0.13888,
  speed_day_max = 1.166,
  speed_day_mean = 0.7111,
  speed_day_sd = 0.20833,
  speed_night_min = 0.22035,
  speed_night_max = 1.85,
  speed_night_mean = 1.128,
  speed_night_sd = 0.2247,
  delta_day_mean = 0.8087532,
  delta_day_sd = 1.332026,
  delta_night_mean = 1.494988,
  delta_night_sd = 1.386166
)

Arguments

length_min	Minimum whale length (meters) used to define a truncated normal distribution.
length_max	Maximum whale length (meters) used to define a truncated normal distribution.
length_mean	Mean whale length (meters).
length_sd	Standard deviation in whale length (meters).
width_factor	The scaling factor used to estimate whale fluke width based on length. For exampl, a width_factor of 0.1 means a 20m whale has a fluke width of 2 meters.
speed_day_min	Minimum daytime whale speed (meters/second) used to define a truncated normal distribution.
speed_day_max	Maximum daytime whale speed (meters/second) used to define a truncated normal distribution.
speed_day_mean	Mean daytime whale speed (meters/second)
speed_day_sd	Standard deviation of daytime whale speed (meters/second)
speed_night_min	Minimum nighttime whale speed (meters/second) used to define a truncated normal distribution.
speed_night_max	Maximum nighttime whale speed (meters/second) used to define a truncated normal distribution.
speed_night_mean	Mean nighttime whale speed (meters/second)
speed_night_sd	Standard deviation of nighttime whale speed (meters/second)
delta_day_mean	Mean of daytime whale track variability, defined as the standard deviation of changes in whale course (log-transformed) every 60 seconds; values will be drawn from a normal distribution with mean 0, then reverse-log-transformed.
delta_day_sd	Standard deviation of track variability.
delta_night_mean	Mean of nighttime whale track variability.
delta_night_sd	Standard deviation of nighttime whale track variability.

Details

The sources and rationale for these values are explaiend in Keen et al. (2023).

Value

A named list of these inputs, without any changes at all. Pass this list to shipstrike::encounter_rate() or shipstrike::outcome_predict().

ericmkeen/shipstrike documentation built on May 21, 2023, 7:05 a.m.