Ecopath

Ecopath
Name	Ecopath
Title	Ecopath
Developer	Ecopath Research Group
Released	1980s
Programming language	Fortran, MATLAB, C++, R, Python
Operating system	Cross-platform
Genre	Ecosystem modeling software

Contents

Ecopath is a quantitative ecosystem modeling framework originally developed to represent trophic flows and mass-balance relationships in marine and freshwater food webs. It provides a snapshot approach for estimating production, consumption, and diet composition among functional groups and is widely used by marine scientists, fisheries managers, and conservation organizations. Ecopath has been applied in studies involving the International Union for Conservation of Nature, Food and Agriculture Organization, National Oceanic and Atmospheric Administration, United Nations Environment Programme, and regional research institutes.

Introduction

Ecopath offers a mass-balance model that links biomasses, production rates, consumption rates, diet composition, and fisheries catches for defined groups within an ecosystem. The framework interfaces with influential institutions such as Woods Hole Oceanographic Institution, Scripps Institution of Oceanography, Smithsonian Institution, University of Washington, and University of British Columbia, and has been used in assessments associated with Convention on Biological Diversity meetings and Ramsar Convention consultations. Practitioners from NOAA Fisheries, European Commission, Australian Institute of Marine Science, Fisheries and Oceans Canada, and Pew Charitable Trusts have employed Ecopath outputs to inform policy discussions at forums like United Nations Conference on Sustainable Development.

Ecopath traces conceptual roots to early trophic ecology and energy flow studies influenced by scientists at Woods Hole Oceanographic Institution, Scripps Institution of Oceanography, University of Miami, and Florida State University. Foundational development occurred during collaborations among researchers affiliated with National Marine Fisheries Service, International Council for the Exploration of the Sea, and academic groups at University of British Columbia and University of Washington. Major milestones include incorporation into initiatives led by Food and Agriculture Organization, integration with programs at World Wildlife Fund, and adoption by regional centers such as Centro de Investigaciones del Mar y la Atmósfera and Institut Français de Recherche pour l'Exploitation de la Mer. The model evolved through contributions from scientists associated with awards and institutions like the National Academy of Sciences, Royal Society, and research funding from National Science Foundation and European Research Council.

Ecopath employs mass-balance equations linking biomasses (B), production per biomass (P/B), consumption per biomass (Q/B), diet composition matrices, and catches. The approach builds on quantitative work by ecologists from Colorado State University, University of California, Santa Barbara, University of British Columbia, and University of Tokyo. Inputs and outputs often feed into management frameworks used by International Maritime Organization and Convention on International Trade in Endangered Species of Wild Fauna and Flora deliberations. Methodological components include parameter estimation techniques informed by literature from Journal of Marine Research, Nature, Science, and specialist compilations edited at Smithsonian Institution and British Museum. Statistical and computational methods draw on algorithms and routines developed at Massachusetts Institute of Technology, Stanford University, Princeton University, and University of Cambridge.

Validation efforts compare Ecopath results with empirical data from monitoring programs run by NOAA, Fisheries Research Services, Marine Biological Association, Australian Institute of Marine Science, and long-term observatories like Bermuda Institute of Ocean Sciences and Station M. Criticisms addressed in literature from Proceedings of the Royal Society B, Ecology Letters, ICES Journal of Marine Science, and Fish and Fisheries concern assumptions of equilibrium, aggregation of species into functional groups, parameter uncertainty, and temporal dynamics. Debates have involved researchers at University of California, Santa Barbara, University of Washington, University of British Columbia, Woods Hole Oceanographic Institution, and policy analysts at Food and Agriculture Organization and World Bank.

Software implementations span original Fortran code, graphical interfaces developed at research centers including University of British Columbia and Woods Hole Oceanographic Institution, and modern ports integrating tools from Matlab, R (programming language), and Python (programming language). Versions have been distributed and discussed at conferences hosted by International Symposium on Fisheries Ecology, ICES, American Fisheries Society, European Marine Biology Symposium, and workshops at Scripps Institution of Oceanography and Woods Hole Oceanographic Institution. Computational performance improvements incorporated libraries and frameworks from GNU Project, Linear Algebra PACKage, and high-performance computing facilities at Lawrence Berkeley National Laboratory and National Center for Supercomputing Applications.

Ecosystem modeling tools and extensions that interoperate with Ecopath workflows include network analysis packages developed at Santa Fe Institute, spatial ecosystem simulators used by Regional Ocean Modeling System teams, decision-support systems maintained by FAO, and multi-model platforms from EU Copernicus Programme. Other related software and methodologies arise from collaborations with Marxan conservation planning, agent-based models from University of Chicago, and ecological forecasting research at National Center for Atmospheric Research, Potsdam Institute for Climate Impact Research, and International Institute for Applied Systems Analysis.

Category:Ecosystem models