Skip Navigation

This Article
Right arrow FREE Full Text (PDF) Freely available
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in ISI Web of Science
Right arrow Alert me to new issues of the journal
Right arrow Add to My Personal Archive
Right arrow Download to citation manager
Right arrow Search for citing articles in:
ISI Web of Science (13)
Right arrowRequest Permissions
Google Scholar
Right arrow Articles by Umeki, K.
Right arrow Search for Related Content
PubMed
Right arrow Articles by Umeki, K.
Agricola
Right arrow Articles by Umeki, K.
Social Bookmarking
Add to CiteULike   Add to Connotea   Add to Del.icio.us  
What's this?

Annals of Botany 75: 259-265, 1995
© 1995 Annals of Botany Company

Importance of Crown Position and Morphological Plasticity in Competitive Interaction in a Population of Xanthium canadense

Kiyoshi Umeki

Center for Ecological Research, Kyoto University, Kyoto, 606-01 Japan

Interactions between individuals in terms of asymmetrical display of crowns and reduction of growth were followed in an experimental population of Xanthium canadense .

Competitive interaction was analysed using a neighbourhood interference model. For the analysis of morphological interaction, crown-vector, a two-dimensional vector that joins the stem base position of a plant with the centroid of its projected crown area, was used to express the direction and magnitude of the asymmetry in crown display. A model was developed in which the change in crown-vector during a growth period was expressed as a function of both the size of the focal plant and the size and location of its neighbours.

There was strong morphological interaction between crowns; they repelled each other. The competitive interaction was detectable by the competition model with crown-centres used as plant locations, but not detectable with stem bases used as plant locations.

It was concluded that the position of neighbours' crowns were important in determining the growth and crown asymmetry, which in turn determine the crown location; and morphological plasticity in crown shape works to reduce interference between individuals.Copyright 1995, 1999 Academic Press

Crown asymmetry, Xanthium canadense, cocklebur, neighbourhood effect, morphological plasticity


Add to CiteULike CiteULike   Add to Connotea Connotea   Add to Del.icio.us Del.icio.us    What's this?


This article has been cited by other articles:


Home page
 Biol. Bull.Home page
D. H. Van Winkle and N. W. Blackstone
Variation in Growth and Competitive Ability Between Sexually and Clonally Produced Hydroids
Biol. Bull., April 1, 2002; 202(2): 156 - 165.
[Abstract] [Full Text] [PDF]


Disclaimer: Please note that abstracts for content published before 1996 were created through digital scanning and may therefore not exactly replicate the text of the original print issues. All efforts have been made to ensure accuracy, but the Publisher will not be held responsible for any remaining inaccuracies. If you require any further clarification, please contact our Customer Services Department.