Effects of an invasive cattail species (Typha x glauca) on sediment nitrogen and microbial community composition in a freshwater wetland

TitleEffects of an invasive cattail species (Typha x glauca) on sediment nitrogen and microbial community composition in a freshwater wetland
Publication TypeJournal Article
Year of Publication2006
AuthorsAngeloni NL, Jankowski KJo, Tuchman NCrandall, Kelly JJ
JournalFEMS Microbiology Letters
Volume263
Issue1
Pagination86 - 92
Date Published10/2006
KeywordsWETLANDS VEGETATION
Abstract

Sediments from Cheboygan Marsh, a coastal freshwater wetland on Lake Huron that has been invaded by an emergent exotic plant, TyphaƗglauca, were examined to assess the effects of invasion on wetland nutrient levels and sediment microbial communities. Comparison of invaded and uninvaded zones of the marsh indicated that the invaded zone showed significantly lower plant diversity, as well as significantly higher aboveground plant biomass and soil organic matter. The sediments in the invaded zone also showed dramatically higher concentrations of soluble nutrients, including greater than 10-fold higher soluble ammonium, nitrate, and phosphate, which suggests that TyphaƗglauca invasion may be impacting the wetland's ability to remove nutrients. Terminal restriction fragment length polymorphism analyses revealed significant differences in the composition of total bacterial communities (based on 16S-rRNA genes) and denitrifier communities (based on nirS genes) between invaded and uninvaded zones. This shift in denitrifiers in the sediments may be ecologically significant due to the critical role that denitrifying bacteria play in removal of nitrogen by wetlands.

DOI10.1111/j.1574-6968.2006.00409.x