Coexistence and interference in two submersed freshwater perennial plants

Interactions between two codominant submersed freshwater perennial plants, Eleocharis acicularis (L.) R. and S. and Juncus pelocarpus forma submersus Fassett, were studied in a softwater lake. Analysis of segregation indicated a nonrandom arrangement of individual rosettes of each species with respe...

Full description

Saved in:
Bibliographic Details
Published in:Oecologia 1983-09, Vol.59 (2/3), p.393-396
Main Authors: McCreary, N.J, Carpenter, S.R, Chaney, J.E
Format: Article
Language:English
Subjects:
Animal and plant ecology
Animal, plant and microbial ecology
Biological and medical sciences
Coastal ecology
Communities
Demecology
Ecological competition
Freshwater ecology
Fundamental and applied biological sciences. Psychology
Juncus pelocarpus
Macrophytes
Peat
Plant shading
Plants
Plants and fungi
Sediments
Species
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Interactions between two codominant submersed freshwater perennial plants, Eleocharis acicularis (L.) R. and S. and Juncus pelocarpus forma submersus Fassett, were studied in a softwater lake. Analysis of segregation indicated a nonrandom arrangement of individual rosettes of each species with respect to rosettes of the other species. Factors influencing growth of the species were examined using de Wit replacement series replicated four times at five ratios, under three environmental treatments: Sphagnum peat, double field density, and shading, and a control. Plants grown in pure culture showed no significant difference in yield between the two species. When plants were grown in mixture, there were significant differences between species. Yields of both species were significantly different among environmental treatments. A significant effect of Eleocharis: Juncus ratio in the double density treatment resulted from interference among conspecific neighbors. Relative Yield Totals ranged from 0.84 to 1.0 for all four treatments, and ratio diagrams indicate stable coexistence through the growing season under all four environmental regimes. Interspecific interference was less important than environmental factors and intraspecific interference in determining growth in these experiments. Eleocharis and Juncus are nonrandomly intermingled, and can coexist under a variety of environmental manipulations. This outcome is consistent with their reported distributions in nature. The mechanism that permits this stable coexistence awaits explanation.
ISSN:0029-8549
1432-1939
DOI:10.1007/BF00378867