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4 - Operationalizing an ecosystem services-based approach for managing river biodiversity

from Part I - Addressing global challenges

Published online by Cambridge University Press:  05 May 2015

Catherine M. Febria
Affiliation:
University of Canterbury
Benjamin J. Koch
Affiliation:
Northern Arizona University
Margaret A. Palmer
Affiliation:
University of Maryland
Julia Martin-Ortega
Affiliation:
The James Hutton Institute, Scotland
Robert C. Ferrier
Affiliation:
The James Hutton Institute, Scotland
Iain J. Gordon
Affiliation:
The James Hutton Institute, Scotland
Shahbaz Khan
Affiliation:
United Nations Educational, Scientific and Cultural Organization (UNESCO), France
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Summary

4.1 INTRODUCTION

Covering less than 1% of the Earth's surface, freshwater – streams, rivers, ponds, wetlands, and lakes – supports as much as 10% of all animal species, including one-third of all vertebrates (Strayer & Dudgeon 2010; Figure 4.1). While being among the most biologically diverse, freshwater ecosystems are also among the most imperiled on the planet. In developed regions such as Europe and USA, more than 30% of freshwater species are now thought to be threatened or extinct. As with the majority of the world's ecosystems, accelerated rates of human population growth, industrialization, and agricultural intensification are driving these dramatic species losses, with invasive species introductions, over-harvesting, and loss of habitats being the primary causes (Dudgeon 2013).

Reducing freshwater biodiversity loss is at odds with managing many other ecosystem services. Much of the conflict lies in the fact that freshwaters are ‘hot spots’ for both human needs (i.e. drinking, irrigation, transportation) as well as biodiversity (i.e. the number or suite of species native to a given area; Strayer & Dudgeon 2010; Leisher, this book). Moreover, the majority of the world's population is facing, and will continue to face, increasing water scarcity (Vörösmarty et al. 2010). Humans rely heavily on freshwater, and in particular from large rivers for hydropower, transportation, and fisheries. Water abstraction further strains the integrity of a river's biophysical components, including biodiversity. While some aspects of freshwater ecosystem services are renewable (e.g. water supply), biodiversity is not.

This chapter seeks to clarify how ecosystem service-based approaches can be put into practice (‘operationalized’) for the purpose of prioritizing freshwater biodiversity alongside other river services. We propose a framework that is meant to serve as a way to explore trade-offs in ecosystem services delivery. We base this operationalization on three typical perspectives associated with freshwater biodiversity: inherent value as a final service, biodiversity–ecosystem function (an intermediate or provisioning service), and some combination of the two.

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