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S trath E2E2: An r package for modelling the dynamics of marine food webs and fisheries
Author(s) -
Heath Michael R.,
Speirs Douglas C.,
Thurlbeck Ian,
Wilson Robert J.
Publication year - 2021
Publication title -
methods in ecology and evolution
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.425
H-Index - 105
ISSN - 2041-210X
DOI - 10.1111/2041-210x.13510
Subject(s) - environmental science , ecology , detritus , marine ecosystem , fishing , food chain , advection , oceanography , ecosystem , biomass (ecology) , range (aeronautics) , ecosystem model , food web , biology , fishery , physics , materials science , composite material , geology , thermodynamics
We present S trath E2E2, an r package for modelling the whole ecosystem, or ‘big‐picture’ effects of hydrodynamics, temperature, nutrient additions and fishing on continental shelf marine food webs. S trath E2E2 has two linked parts—a fishing fleet model and an ecology model. The fishing model combines harvesting, discarding and seabed disturbance rates across a range of gears and passes the results into the ecology model. The ecology model is a network of coupled ordinary differential equations representing the rates of change in nitrogen mass of organic detritus, dissolved inorganic nutrient and coarse guilds of living biomass spanning microbes to megafauna. The equations include representations of feeding, metabolism, reproduction, active migrations, advection and mixing. Environmental driving data include temperature, irradiance, hydrodynamics and nutrient inputs from rivers, atmosphere and ocean boundaries. The package includes functions for parameter optimization, global sensitivity analysis and Monte Carlo estimation of credible intervals for model outputs. A fully developed and documented implementation for the North Sea is included with the package.