Unintended consequences of urbanization for aquatic ecosystems: A case study from the Arizona desert


Journal Article

Many changes wrought during the construction of "designer ecosystems" are intended to ensure - and often succeed in ensuring - that a city can provide ecosystem goods and services; but other changes have unintended impacts on the ecology of the city, impairing its ability to provide these critical functions. Indian Bend Wash, an urbanizing watershed in the Central Arizona-Phoenix (CAP) ecosystem, provides an excellent case study of how human alteration of land cover, stream channel structure, and hydrology affect ecosystem processes, both intentionally and unintentionally. The construction of canals created new flowpaths that cut across historic stream channels, and the creation of artificial lakes produced sinks for fine sediments and hotspots for nitrogen processing. Further hydrologic manipulations, such as groundwater pumping, linked surface flows to the aquifer and replaced ephemeral washes with perennial waters. These alterations of hydrologic structure are typical by-products of urban growth in arid and semiarid regions and create distinct spatial and temporal patterns of nitrogen availability. © 2008 American Institute of Biological Sciences.

Full Text

Duke Authors

Cited Authors

  • Roach, WJ; Heffernan, JB; Grimm, NB; Arrowsmith, JR; Eisinger, C; Rychener, T

Published Date

  • September 1, 2008

Published In

Volume / Issue

  • 58 / 8

Start / End Page

  • 715 - 727

International Standard Serial Number (ISSN)

  • 0006-3568

Digital Object Identifier (DOI)

  • 10.1641/B580808

Citation Source

  • Scopus