Wetlands

, Volume 30, Issue 3, pp 589–601 | Cite as

Historical Ecology as a Tool for Assessing Landscape Change and Informing Wetland Restoration Priorities

  • Eric D. Stein
  • Shawna Dark
  • Travis Longcore
  • Robin Grossinger
  • Nicholas Hall
  • Michael Beland
Original Paper

Abstract

Vast resources are devoted annually to watershed management and wetland restoration. Historical wetland losses are often cited as a motivation for prioritizing ambitious wetland restoration efforts. However, analysis of historical conditions is often underutilized in the planning process. In this paper we demonstrate historical ecological analysis of the San Gabriel River watershed in southern California. We integrate multiple disparate data sources collected at different spatial and temporal scales to describe historical wetland extent and distribution. We compare historic wetlands to contemporary conditions to calculate wetland losses. From the results of this analysis, we conclude that the widely held view of southern California as naturally dry and desert-like with mainly ephemeral and intermittent streams may be an over generalization. Historically, the San Gabriel watershed has supported complex expanses of channels, ponds, sloughs, seeps, marshes, and seasonal wetlands that alternated between wet and dry conditions on multi-year to decadal cycles. We estimate that >86% of historical wetlands have been lost since ca. 1870, with the greatest losses occurring to palustrine alkali meadows in the lower floodplain. Despite the extensive losses, the analysis reveals areas of the watershed conducive to wetland re-establishment and provides insight into the most appropriate wetland types to prioritize for specific watershed settings.

Keywords

Reference conditions Riparian Status and trends Watershed analysis Wetland change assessment 

Supplementary material

13157_2010_50_MOESM1_ESM.doc (54 kb)
ESM 1(DOC 54 kb)

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Copyright information

© Society of Wetland Scientists 2010

Authors and Affiliations

  • Eric D. Stein
    • 1
  • Shawna Dark
    • 2
  • Travis Longcore
    • 3
  • Robin Grossinger
    • 4
  • Nicholas Hall
    • 5
  • Michael Beland
    • 2
  1. 1.Southern California Coastal Water Research ProjectCosta MesaUSA
  2. 2.Geography DepartmentCalifornia State University NorthridgeNorthridgeUSA
  3. 3.Department of GeographyUniversity of Southern CaliforniaLos AngelesUSA
  4. 4.San Francisco Estuary InstituteOaklandUSA
  5. 5.Department of HistoryUniversity of Southern CaliforniaLos AngelesUSA

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