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

W. John Roach, James B. Heffernan, Nancy B. Grimm, J. Ramón Arrowsmith, Chris Eisinger, Tyler Rychener

Research output: Contribution to journalArticlepeer-review

49 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)715-727
Number of pages13
Issue number8
StatePublished - Sep 2008


  • Biogeochemistry
  • CAP LTER (Central Arizona-Phoenix Long-Term Ecological Research)
  • Geomorphology
  • Hydrology
  • Urban stream

ASJC Scopus subject areas

  • Agricultural and Biological Sciences(all)


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