striper_calc: Numbers of Striped Bass in a Reach

In mrguyperson/predpackplus: Evaluate Piscivore Predation in the Sacramento River

Description

Calculate the numbers of striped bass in a reach based on field data

Usage

striper_calc(
  n_transects,
  agg_ratio = 1/3,
  mean_low = 60,
  sd_low = 43,
  mean_high = 870,
  sd_high = 491.5
)

Arguments

n_transects	integer of transects in the model
agg_ratio	the ratio of large aggregations to low numbers of fish in a reach; default is 1/3
mean_low	mean number of fish per transect when no aggregation is present; default is 60
sd_low	std dev of number of fish per transect when no aggregation is present; default is 43
mean_high	mean number of fish per transect when an aggregation is present; default is 870
sd_high	std dev of number of fish per transect when an aggregation is present; default is 491.5

Value

a vector of numbers of fish per transect

Source

defaults based on Michel et al. 2018. "Non-native fish predator density and molecular-based diet estimates suggest differing effects of predator species on Juvenile Salmon in the San Joaquin River, California"

Examples

striper_calc(n_transects = 10)

mrguyperson/predpackplus documentation built on Dec. 21, 2021, 10:08 p.m.