TITLE

Hybridization among foundation tree species influences the structure of associated understory plant communities

PUB. DATE
March 2011
SOURCE
Botany;Mar2011, Vol. 89 Issue 3, p165
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Understanding how genetic identity influences community structure is a major focus in evolutionary ecology, yet few studies examine interactions among organisms in the same trophic level within this context. In a common garden containing trees from a hybrid system ( Populus fremontii S. Wats. � Populus angustifolia James), we tested the hypothesis that the structure of establishing understory plant communities is influenced by genetic differences among trees and explored foliar condensed tannins (CTs) and photosynthetically active radiation (PAR) as mechanisms. Several findings support our hypothesis: ( i) Understory biomass and cover increase along the genetic gradient from P.�angustifolia to P.�fremontii. ( ii) Along the same hybridization gradient, species richness decreases and species composition shifts. ( iii) Populus foliar CT concentrations and PAR decrease from P.�angustifolia to P.�fremontii. ( iv) Understory species richness increases with foliar CTs; however, biomass, cover, and composition show no relationship with CTs, and no understory variables correlate with PAR. ( v) Structural equation modeling suggests that foliar CTs are a primary mechanism linking overstory tree genetics with understory richness. Using an experimental system dominated by naturally colonizing exotic species, this study demonstrates that a genetic gradient created by tree hybridization can influence understory plants.
ACCESSION #
65536816

 

Related Articles

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics