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Abstract Detail


Lichens as Bioindicators of Air Quality

Washburn, Stephen [1].

Ozone exposure indices correlated with lichen abundance data in greater Cincinnati metropolitan area, Ohio.

HOURLY ozone data for five years (1999 2003) in the greater Cincinnati metropolitan area are used to calculate average annual values for a suite of eight ozone exposure indices. These are then compared to local lichen abundance data to determine which index is best able to discern a relationship between ozone exposure and lichen community structure. It is demonstrated that the SUM00 and 12-hour AOT40 (restricted to daylight hours) ozone exposure indices have a significant correlation with lichen abundance, while the U.S. EPA 1-Hour and 8-Hour National Ambient Air Quality Standards and the N100, SUM06, 24-hour AOT-40, and W126 indices do not. This finding indicates that lichens are less responsive to peak ozone event exposure and are primarily sensitive to cumulative exposure, which provides a compelling reason to include some form of a cumulative index in the secondary National Ambient Air Quality Standard for ozone. The appropriateness of a flux-based ambient air quality standard for non-vascular plants is discussed. A model of ozone flux for generalized lichens is developed.[c.e.:srb]


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1 - 9015 Cherry Blossom Lane, Cincinnati, Ohio, 45231, USA

Keywords:
ozone regime
exposure index
dose-response.

Presentation Type: Symposium or Colloquium Presentation
Session: 32-2
Location: 277/Holt
Date: Tuesday, August 1st, 2006
Time: 8:45 AM
Abstract ID:420


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