Present address: Department of Biological Sciences, Macquarie University, North Ryde, NSW 2109, Australia.
Patterns and consequences of differential vascular sectoriality in 18 temperate tree and shrub species
Article first published online: 19 APR 2006
Volume 20, Issue 2, pages 200–206, April 2006
How to Cite
ZANNE, A. E., SWEENEY, K., SHARMA, M. and ORIANS, C. M. (2006), Patterns and consequences of differential vascular sectoriality in 18 temperate tree and shrub species. Functional Ecology, 20: 200–206. doi: 10.1111/j.1365-2435.2006.01101.x
- Issue published online: 19 APR 2006
- Article first published online: 19 APR 2006
- Received 30 October 2005; revised 10 January 2006; accepted 12 January 2006 Editor: K. Thompson
- ecological tolerance;
- environmental heterogeneity;
- vascular anatomy
- 1Resource delivery within plants depends on supply pathways. Some species have relatively constrained (sectored) vascular connections, while others have relatively unconstrained (integrated) vascular connections.
- 2In this study, patterns of vascular hydraulic sectoriality, anatomy and ecological tolerance were examined for 18 Northern Hemisphere temperate woody species growing at Arnold Arboretum, Jamaica Plain, MA, USA. A hydraulic technique was used to measure axial and tangential conductivity on branch segments. From a ratio of these values, a sectoriality index was calculated.
- 3Species that were more hydraulically sectored had greater vessel size, variation in vessel area and tangential nearest-neighbour distance, as well as lower vessel density, than did integrated species.
- 4Ecologically, higher tolerance to drought and wind was correlated with being sectored, while higher tolerance to flood and shade was correlated with being integrated.
- 5These results suggest that sectored species should be especially prominent in xeric environments where sectoriality may reduce embolism spread by minimizing vessel-to-vessel contact and pitting, and integrated species should be especially prominent when resources are spatially patchy or heterogeneous.