eCite Digital Repository

Warming and free-air CO2 enrichment alter demographics in four co-occurring grassland species


Williams, AL and Wills, KE and Janes, J and Vanderschoor, JK and Newton, PCD and Hovenden, MJ, Warming and free-air CO2 enrichment alter demographics in four co-occurring grassland species, New Phytologist, 176, (2) pp. 365-374. ISSN 0028-646X (2007) [Refereed Article]

DOI: doi:10.1111/j.1469-8137.2007.02170.x


• Species differ in their responses to global changes such as rising CO 2 and temperature, meaning that global changes are likely to change the structure of plant communities. Such alterations in community composition must be underlain by changes in the population dynamics of component species. • Here, the impact of elevated CO 2 (550 μmol mol -1) and warming (+2°C) on the population growth of four plant species important in Australian temperate grasslands is reported. Data collected from the Tasmanian free-air CO 2 enrichment (TasFACE) experiment between 2003 and 2006 were analysed using population matrix models. • Population growth of Themeda triandra, a perennial C 4 grass, was largely unaffected by either factor but population growth of Austrodanthonia caespitosa, a perennial C 3 grass, was reduced substantially in elevated CO 2 plots. Warming and elevated CO 2 had antagonistic effects on population growth of two invasive weeds, Hypochaeris radicata and Leontodon taraxacoides, with warming causing population decline. Analysis of life cycle stages showed that seed production, seedling emergence and establishment were important factors in the responses of the species to global changes. • These results show that the demographic approach is very useful in understanding the variable responses of plants to global changes and in elucidating the life cycle stages that are most responsive. © The Authors (2007).

Item Details

Item Type:Refereed Article
Research Division:Biological Sciences
Research Group:Other biological sciences
Research Field:Global change biology
Objective Division:Animal Production and Animal Primary Products
Objective Group:Pasture, browse and fodder crops
Objective Field:Pasture, browse and fodder crops not elsewhere classified
UTAS Author:Williams, AL (Miss Amity Williams)
UTAS Author:Wills, KE (Dr Karen Wills)
UTAS Author:Janes, J (Ms Jaz Janes)
UTAS Author:Vanderschoor, JK (Mrs Jacqueline Vanderschoor)
UTAS Author:Hovenden, MJ (Professor Mark Hovenden)
ID Code:50238
Year Published:2007
Web of Science® Times Cited:93
Deposited By:Plant Science
Deposited On:2007-08-01
Last Modified:2008-05-26

Repository Staff Only: item control page