Longitudinal connectivity loss in a riverine network: accounting for the likelihood of upstream and downstream movement across dams

Rincón Sanz, Gonzalo and Solana Gutierrez, Joaquin and Alonso González, Carlos and Saura Martínez de Toda, Santiago Fulgencio and García de Jalón Lastra, Diego (2017). Longitudinal connectivity loss in a riverine network: accounting for the likelihood of upstream and downstream movement across dams. "Aquatic Sciences", v. 79 (n. 3); pp. 573-585. ISSN 1015-1621. https://doi.org/10.1007/s00027-017-0518-3.

Description

Title: Longitudinal connectivity loss in a riverine network: accounting for the likelihood of upstream and downstream movement across dams
Author/s:
  • Rincón Sanz, Gonzalo
  • Solana Gutierrez, Joaquin
  • Alonso González, Carlos
  • Saura Martínez de Toda, Santiago Fulgencio
  • García de Jalón Lastra, Diego
Item Type: Article
Título de Revista/Publicación: Aquatic Sciences
Date: July 2017
Volume: 79
Subjects:
Freetext Keywords: conectividad longitudinal, ríos.
Faculty: E.T.S.I. Montes, Forestal y del Medio Natural (UPM)
Department: Sistemas y Recursos Naturales
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

Disruption of longitudinal connectivity is a major concern in most of the world¿s rivers. Approaches based on graph theory have proven to be a suitable tool for analysing functional connectivity. However, previous applications of graph-based connectivity methods to river systems have been oversimplified in that they have treated potential barriers as binary features and rivers as symmetric networks. We here apply a network analytical approach in which (a) upstream and downstream connectivity are considered so that fish passability values across dams are asymmetrical, and (b) it is possible to consider a continuous range of passability values for every dam. We build on previous and widely used connectivity metrics (Probability of Connectivity, PC), which here are generalised and adapted toward that end. We compare the results of our approach with those that would be obtained under the more simplified assumptions of symmetric movement and of barriers as binary features. We want to prove if there are substantial differences between considering or not the asymmetry in river networks. The application of symmetrical and asymmetrical PC highlights major differences between the upstream connectivity versus the downstream connectivity. We provide our methods in a free software package so that they can be used in any other application to riverscapes. We expect to provide a better graph-based approach for the prioritisation of the removal or permeabilization of artificial obstacles as well as for the preservation of target river segments for connectivity conservation and restoration.

More information

Item ID: 50173
DC Identifier: http://oa.upm.es/50173/
OAI Identifier: oai:oa.upm.es:50173
DOI: 10.1007/s00027-017-0518-3
Deposited by: Memoria Investigacion
Deposited on: 16 Apr 2018 15:54
Last Modified: 25 Mar 2019 14:18
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