Code from: Spatial heterogeneity modulates dispersal effects on metapopulation abundance: insights from a graphical approach

This Dryad package contains source code for generating schematic figures
that illustrate equilibrium geometry in a family of
ecological/population-dynamics models. The scripts focus on (i) a logistic
growth model and (ii) consumer–resource / predator–prey extensions with
Type I and Type II (Holling) functional responses. Across alternative
assumptions about the relationship between intrinsic growth rate (r) and
carrying capacity (K) (i.e., different r–K relationships or trade-offs),
the code computes equilibrium conditions and visualizes how equilibrium
solutions lie on, or are constrained by, characteristic ellipses in
parameter/state space. The archive is code-only and does not include
empirical datasets; no simulated datasets are required for reuse. Running
the scripts reproduces the conceptual diagrams by deterministically
evaluating equilibrium expressions and/or numerical solutions on
user-specified parameter grids, and outputs publication-ready figures
(e.g., PDF/PNG) along with intermediate objects (e.g., coordinates of
ellipses and equilibrium points) when enabled. Reuse potential includes
(a) reproducing or adapting schematic figures for manuscripts, theses, and
teaching materials, (b) extending to alternative functional responses or
additional biological processes, and (c) sensitivity exploration of how
assumed r–K relationships reshape equilibrium structure. The package
contains no personal, sensitive, or confidential information and raises no
human- or animal-subject ethical concerns. Files are intended for open
reuse consistent with Dryad’s licensing requirements.