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The importance of quantifying propagule pressure to understand invasion: an examination of riparian forest invasibility.
MedLine Citation:
PMID:  21797159     Owner:  NLM     Status:  In-Process    
Abstract/OtherAbstract:
The widely held belief that riparian communities are highly invasible to exotic plants is based primarily on comparisons of the extent of invasion in riparian and upland communities. However, because differences in the extent of invasion may simply result from variation in propagule supply among recipient environments, true comparisons of invasibility require that both invasion success and propagule pressure are quantified. In this study, we quantified propagule pressure in order to compare the invasibility of riparian and upland forests and assess the accuracy of using a community's level of invasion as a surrogate for its invasibility. We found the extent of invasion to be a poor proxy for invasibility. The higher level of invasion in the studied riparian forests resulted from greater propagule availability rather than higher invasibility. Furthermore, failure to account for propagule pressure may confound our understanding of general invasion theories. Ecological theory suggests that species-rich communities should be less invasible. However, we found significant relationships between species diversity and invasion extent, but no diversity-invasibility relationship was detected for any species. Our results demonstrate that using a community's level of invasion as a surrogate for its invasibility can confound our understanding of invasibility and its determinants.
Authors:
Anne K Eschtruth; John J Battles
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Ecology     Volume:  92     ISSN:  0012-9658     ISO Abbreviation:  Ecology     Publication Date:  2011 Jun 
Date Detail:
Created Date:  2011-07-29     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0043541     Medline TA:  Ecology     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1314-22     Citation Subset:  IM    
Affiliation:
University of California, Environmental Science, Policy, and Management, 137 Mulford Hall, Berkeley, California 94720-3114, USA. eschtruth@berkeley.edu
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