predator-energy-density: Predator Energy Density Functions for FB4 Model

In fb4package: 'Fish Bioenergetics 4.0' Model Implementation with High-Performance 'TMB' Backend

Predator Energy Density Functions for FB4 Model

Description

Functions implementing three predator energy density models (PREDEDEQ 1–3) and the corresponding weight-solving routines used in the FB4 energy balance.

PREDEDEQ 1 — interpolated daily data: energy density supplied as a vector of length n_{\text{days}} + 1 (one value per day boundary).

PREDEDEQ 2 — piecewise linear by weight: ED = \alpha_1 + \beta_1 W below the cutoff, ED = \alpha_2 + \beta_2 W above.

PREDEDEQ 3 — power function: ED = \alpha_1 \cdot W^{\beta_1}.

Value

No return value; this page documents the predator energy density functions module. See individual function documentation for return values.

References

Hanson, P.C., Johnson, T.B., Schindler, D.E. and Kitchell, J.F. (1997). Fish Bioenergetics 3.0. University of Wisconsin Sea Grant Institute, Madison, WI.

Deslauriers, D., Chipps, S.R., Breck, J.E., Rice, J.A. and Madenjian, C.P. (2017). Fish Bioenergetics 4.0: An R-based modeling application. Fisheries, 42(11), 586–596. \Sexpr[results=rd]{tools:::Rd_expr_doi("10.1080/03632415.2017.1377558")}

fb4package documentation built on May 8, 2026, 1:07 a.m.