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Related Experiment Video

Updated: Nov 29, 2025

Spatial Multiobjective Optimization of Agricultural Conservation Practices using a SWAT Model and an Evolutionary Algorithm
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An accessible optimisation method for barrier removal planning in stream networks.

Virgilio Hermoso1, Miguel Clavero2, Ana Filipa Filipe3

  • 1Centre de Ciència i Tecnologia Forestal de Catalunya (CTFC), Solsona, Lleida, Spain; Australian Rivers Institute, Griffith University, Nathan, Queensland, Australia.

The Science of the Total Environment
|November 19, 2020
PubMed
Summary
This summary is machine-generated.

Prioritizing barrier removal in rivers using Marxan software can restore freshwater connectivity efficiently. This accessible tool helps stakeholders make informed decisions for ecological restoration projects.

Keywords:
ConnectivityDamFishMarxanPrioritisationWeir

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Area of Science:

  • Freshwater ecology
  • Conservation science
  • Spatial planning

Background:

  • Human infrastructure barriers fragment river networks globally, impacting freshwater ecosystems.
  • River connectivity restoration is crucial, with barrier removal increasing, yet prioritization remains challenging.
  • Current spatial optimization methods require programming skills, limiting stakeholder accessibility.

Purpose of the Study:

  • To demonstrate Marxan, an accessible tool, for prioritizing barrier removal to maximize river connectivity.
  • To identify key barriers for removal to enhance freshwater fish population connectivity.
  • To inform stakeholders on cost-effective barrier removal strategies for river restoration.

Main Methods:

  • Mapped >900 barriers and 29 fish species in the Tagus River.
  • Assessed barrier passability for species and estimated removal costs.
  • Utilized Marxan software for spatial optimization of barrier removal priorities under different scenarios.

Main Results:

  • Connectivity targets can be met by removing a small fraction of barriers, avoiding large infrastructure.
  • Removing some large, high-cost barriers may be necessary for specific species' recovery targets.
  • Identified spatial variations in barrier value for improving upstream and downstream connectivity.

Conclusions:

  • Marxan offers a robust, accessible approach for prioritizing river barrier removal projects.
  • This method enhances decision-making for river connectivity restoration, offering transparency and reproducibility.
  • Improves upon traditional opportunistic or ranking-based approaches for ecological restoration investments.