length_weight_plot: Example length-weight relationships for two species,...

In andrew-edwards/sizeSpectra: Fitting Size Spectra to Ecological Data Using Maximum Likelihood

Example length-weight relationships for two species, demonstrating consequences of length bins

Description

Reproduces Figure 2 of MEPS paper (for default values), showing how the same length bins translate to different body-mass bins for different species. Has not been fully tested with other input values (and some axis values etc are still hardwired).

Usage

length_weight_plot(
  sp1 = "Common Ling",
  sp2 = "Lemon Sole",
  LWa = c(0.001, 0.0255),
  LWb = c(3.4362, 2.7643),
  col1 = c("red", "pink"),
  col2 = c("blue", "lightblue"),
  thick = 7,
  curve_thick = 3,
  length = 10:50,
  lenBins = seq(10, 40, by = 5),
  xlim = c(-6, 50),
  ylim = c(-60, 800),
  inset = c(0.1, -0.02),
  xlab = "Length, cm",
  ylab = "Body mass, g",
  xaxs = "i",
  yaxs = "i",
  mgp = c(2, 0.5, 0),
  lend = "butt"
)

Arguments

sp1	Species 1 name (for legend)
sp2	Species 2 name (for legend)
LWa	Vector of two alpha values (see MEPS equation 1), for species 1 then species 2
LWb	Vector of two beta values (see MEPS equation 1), for species 1 then species 2
col1	Vector of two colours to alternate for species 1
col2	Vector of two colours to alternate for species 2
thick	Thickness of bin segments
curve_thick	Thickness for curves
length	Sequence of length values to plot the length-weight relationships
lenBins	Example length bin breaks to show as examples
xlim, ylim	Limits for x and y axes
inset	Inset for the legend
xlab, ylab	Labes for x and y axes
xaxs, yaxs, mgp, lend	standard options for par(), defaults are for Figure 2 of MEPS

Value

plots Figure, default is Figure 2 of MEPS

Author(s)

Andrew Edwards

andrew-edwards/sizeSpectra documentation built on June 28, 2023, 7:09 p.m.