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Perennial Pepperweed (Lepidium latifolium): Properties of Invaded Tidal Marshes

Published online by Cambridge University Press:  20 January 2017

Laura K. Reynolds  and
Katharyn E. Boyer
Laura K. Reynolds*
Affiliation:
Romberg Tiburon Center for Environmental Studies, San Francisco State University, 3152 Paradise Drive, Tiburon, CA 94920
Katharyn E. Boyer
Affiliation:
Romberg Tiburon Center for Environmental Studies and Department of Biology, San Francisco State University, 3152 Paradise Drive, Tiburon, CA 94920
*
Corresponding author's E-mail: lkreynolds@virginia.edu
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Abstract

Lepidium latifolium (perennial pepperweed) is recognized as a threat to wetland habitats throughout much of the western United States, but its role in tidal marshes has not been explored. Over three seasons in three regions of San Francisco Estuary (Suisun, San Pablo, and South San Francisco bays), we characterized locations in tidal marshes where monotypic stands of L. latifolium are replacing the native Sarcocornia pacifica (pickleweed). Soils within L. latifolium stands had significantly lower moisture, salinity, organic matter, and carbon : nitrogen (C : N) and higher pH than in adjacent S. pacifica stands at similar elevation and distance from channels. In addition, L. latifolium canopies were 2 to 3 times taller, thus increasing light reaching soils, and tended to support different insect/spider assemblages (sampled only at the Suisun site). Patterns were generally consistent across the three sites, although less pronounced for some measures at the South Bay site. Overall, these data suggest that L. latifolium invasion of tidal marshes is leading to modification of both structural and functional properties, several of which might further facilitate spread of the invader; however, additional study is needed to determine cause vs. effect for several soil characteristics.

Keywords

Perennial pepperweed, Lepidium latifolium Linnaeus, Sarcocornia pacifica (Standl.) A. J. Scott.Invasive speciespickleweedSan Francisco BaySarcocorniasoilswetlands
Type
Research
Information
Invasive Plant Science and Management , Volume 3 , Issue 2 , August 2010 , pp. 130 - 138
Copyright
Copyright © Weed Science Society of America 

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Footnotes

Current address: Graduate Student, University of Virginia, Department of Environmental Sciences, Clark Hall, Room 350, 291 McCormick Road, Charlottesville, VA 22904

References

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