College of Education, Abha, Saudi Arabia.
THE BIOLOGY OF AMBROSIA TRIFIDA L. IV. DEMOGRAPHY OF PLANTS AND LEAVES
Article first published online: 2 MAY 2006
Volume 84, Issue 1, pages 107–111, January 1980
How to Cite
ABUL-FATIH, H. A. and BAZZAZ, F.A. (1980), THE BIOLOGY OF AMBROSIA TRIFIDA L. IV. DEMOGRAPHY OF PLANTS AND LEAVES. New Phytologist, 84: 107–111. doi: 10.1111/j.1469-8137.1980.tb00753.x
- Issue published online: 2 MAY 2006
- Article first published online: 2 MAY 2006
- ((Accepted 2 April 1979))
In low-density populations of Ambrosia trifida plants grown in monoculture in the field all individuals survived to maturity. The plants had high rates of leaf birth and death. However, under high densities there was death of whole plants and a decline in leaf birth - and death-rates. Furthermore, under high densities leaves lived longer than did leaves under low density. Thus, regulation of populations in response to density occurs at two levels: whole plants and individual leaves.