A methodology to evaluate the implementation of ecohydrology solutions at the Ecohydrology demonstration sites: The Guadiana case study

Abstract

The Ecohydrology program of UNESCO established demonstration sites around the world where the ecohydrologic techniques are demonstrated to disseminate the concept and by learning from visualization of real in situ experiments and examples. To analyse the impact of applying ecohydrological solutions at the demonstration sites (eg. use of bivalves as filter feeders, phytoremediation or managing freshwater pulses), we propose to use ecosystem service indicators selected by expert judgment and literature. The ecosystem services (ES) concept provides a recognizable and easy way to evaluate the changes on the ecosystem, by measuring the improvement or degradation of the services that are provided. The proposed ES indicators table allows the evaluation of relevant ecosystem services, for all demosites by comparing the following three temporal situations: 1- before the impact occurred, 2 - after it occurred but without any restoration measure being implemented and; 3- after applying ecohydrology restoration solutions. The proposed Ecosystem services matrix was applied to the Guadiana estuary and adjacent coastal area demosite, in the south east of Portugal, based on extensive research on applying ecohydrology solutions at the site and expert judgement. Results show that the application of the Ecosystem Services (ES) matrix allows to understand the benefits of applying the ecohydrology approach, as it helps defining services and areas where more effort in recuperation is needed.