Journal
BULLETIN OF ENTOMOLOGICAL RESEARCH
Volume 99, Issue 3, Pages 229-243Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S0007485308006251
Keywords
community structure; environmental impact; exotic plant; herbivore; Lepidoptera; moth; non-indigenous species; introduced alien plant; per-capita impact; weed
Categories
Funding
- Oregon Department of Agriculture: Noxious Weed Board
- USDI-FWS
- Port of Portland
- Portland Metro Parks and Greenspaces
- Bonneville Power Administration
- Columbia Slough Watershed Council
Ask authors/readers for more resources
Invasive plants have been shown to negatively affect the diversity of plant communities. However, little is known about the effect of invasive plants on the diversity at other trophic levels. In this study, we examine the per capita effects of two invasive plants, purple loosestrife (Lythrum salicaria) and reed canary grass (Phalaris arundinacea), on moth diversity in wetland communities at 20 sites in the Pacific Northwest, USA. Prior studies document that increasing abundance of these two plant species decreases the diversity of plant communities. We predicted that this reduction in plant diversity would result in reduced herbivore diversity. Four measurements were used to quantify diversity: species richness (S), community evenness (J), Brillouin's index (H) and Simpson's index (D). We identified 162 plant species and 156 moth species across the 20 wetland sites. The number of moth species was positively correlated with the number of plant species. In addition, invasive plant abundance was negatively correlated with species richness of the moth community (linear relationship), and the effect was similar for both invasive plant species. However, no relationship was found between invasive plant abundance and the three other measures of moth diversity (J, H, D) which included moth abundance in their calculation. We conclude that species richness within, and among, trophic levels is adversely affected by these two invasive wetland plant species.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available