EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)
5/23/2019 | 11:45 AM - 12:00 PM | TOWARDS EXPERIMENTALLY-BASED ENVIRONMENTAL FLOWS FOR INFRASTRUCTURE MANAGEMENT IN HIGH-ALTITUDE TROPICAL STREAMS | 250 CF
TOWARDS EXPERIMENTALLY-BASED ENVIRONMENTAL FLOWS FOR INFRASTRUCTURE MANAGEMENT IN HIGH-ALTITUDE TROPICAL STREAMS
Thresholds from flow–benthic fauna relationships in the light of data-scarce hydrosystems constitute an advance in implementing sustainable principles for water infrastructure management. To quantify the limits to the amount of water that can be withdrawn from Andean river networks before their natural functioning, biodiversity and ecosystem services become degraded, we conducted a whole-ecosystem experimental flow alteration. We reduced flow in the reach of a stream above a water intake from the supply system for the city of Quito, Ecuador. During the low-flow season, we diverted water using a system of weirs to accommodate streamflow in complementary percents (i.e., 90% flow deviation and 10% flow left in the stream). We performed seven reductions and kept them for seven days, during that time we sampled benthic algae chlorophyll concentration, bottom-velocity, temperature, conductivity, light, and measured stream morphology. Our preliminary results indicate a high variability of ecological and physical responses to hydrological alterations in high-altitude tropical streams. A reduction to minimum flow similar to conditions observed in for the low-flow season caused significant changes in stream morphology and reductions above this thresholds evidence changes in the relative presence of major benthic algae groups.
- Fragmentation
- Hydrology
- Modeling
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Presenters/Authors
Daniela Rosero-López
(), Universidad San Francisco de Quito, droserol@usfq.edu.ec;
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Todd Walter
(), Department of Biological and Environmental Engineering, Cornell University, Ithaca, NY, USA, mtw5@cornell.edu;
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Alexander Flecker
(), Cornell University, Ithaca, NY, USA, asf3@cornell.edu;
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Bert De Brieve
(), Fondo para la Proteccion de Cuencas FONAG, bert.debievre@fonag.org.ec;
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Dunia González-Zeas
(), Insititute for Research and Development IRD, duniapgz@yahoo.com.mx;
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Pablo Lloret
(), Empresa de Agua Potable de Quito, pablo.lloret@aguaquito.gob.ec;
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Olivier Dangles
(), Institut de Recherche pour le Développement (IRD), Centre d'Ecologie Fonctionnelle et Evolutive, UMR 5175, CNRS, Université de Montpellier, Université Paul Valéry Montpellier, EPHE, IRD, Montpellier, France., olivier.dangles@ird.fr;
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