Brisson2001

Référence

Brisson, J. (2001) Neighborhood competition and crown asymmetry in Acer saccharum. Canadian Journal of Forest Research, 31(12):2151-2159.

Résumé

A tree neighboring a new gap must show a certain degree of morphological plasticity in its lateral growth to take advantage of the available space, expanding branches preferentially on the side of the gap. I evaluated the morphological plasticity of sugar maple (Acer saccharum Marsh.) by measuring crown asymmetry with respect to four different neighborhood contexts. Isolated trees have the most symmetrical crown, while all trees at the edge of a field have the largest part of their crown growing away from the forest. Asymmetry of trees at the edge of a forest and a recently constructed right-of-way is intermediate. The crown of forest trees is more developed away from the main competitive pressure of neighboring trees, with a disproportionate influence of the strongest neighbor. This crown development minimizes the negative effects of the interference with neighbors when competition is asymmetrical around a tree. The simplest mechanism allowing morphological plasticity and the resulting crown asymmetry involves a certain degree of autonomy of individual branches. Yet, branch autonomy is less likely for deciduous trees with determinate, single-flush growth patterns such as sugar maple. Some aspects of plasticity in sugar maple need to be investigated, especially with regard to a process where trees could compensate for the negative effects of close neighbors.

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@ARTICLE { Brisson2001,
    AUTHOR = { Brisson, J. },
    TITLE = { Neighborhood competition and crown asymmetry in Acer saccharum },
    JOURNAL = { Canadian Journal of Forest Research },
    YEAR = { 2001 },
    VOLUME = { 31 },
    PAGES = { 2151-2159 },
    NUMBER = { 12 },
    NOTE = { 00455067 (ISSN) Cited By (since 1996): 5 Export Date: 27 April 2007 Source: Scopus CODEN: CJFRA doi: 10.1139/cjfr-31-12-2151 Language of Original Document: English Correspondence Address: Brisson, J.; Inst. de Rech. en Biologie Vegetale; 4101 Sherbrooke Street East Montreal, Que. H1X 2B2, Canada; email: brissoj@magellan.umontreal.ca References: Barden, L.S., Forest development in canopy gaps of a diverse hardwood forest of the southern Appalachians Mountains (1981) Oikos, 37, pp. 205-209; Batschelet, E., Recent statistical methods for orientation data (1972) Animal orientation and navigation, pp. 61-91. , Edited by S.R. Galler, K. Schmidt-Koenig, G.J. Jacobs, and R.E. Belleville. 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    ABSTRACT = { A tree neighboring a new gap must show a certain degree of morphological plasticity in its lateral growth to take advantage of the available space, expanding branches preferentially on the side of the gap. I evaluated the morphological plasticity of sugar maple (Acer saccharum Marsh.) by measuring crown asymmetry with respect to four different neighborhood contexts. Isolated trees have the most symmetrical crown, while all trees at the edge of a field have the largest part of their crown growing away from the forest. Asymmetry of trees at the edge of a forest and a recently constructed right-of-way is intermediate. The crown of forest trees is more developed away from the main competitive pressure of neighboring trees, with a disproportionate influence of the strongest neighbor. This crown development minimizes the negative effects of the interference with neighbors when competition is asymmetrical around a tree. The simplest mechanism allowing morphological plasticity and the resulting crown asymmetry involves a certain degree of autonomy of individual branches. Yet, branch autonomy is less likely for deciduous trees with determinate, single-flush growth patterns such as sugar maple. Some aspects of plasticity in sugar maple need to be investigated, especially with regard to a process where trees could compensate for the negative effects of close neighbors. },
    KEYWORDS = { Morphology Plasticity Crown asymmetry Sugar mapple Forestry asymmetry competition (ecology) interference competition morphology tree Acer Acer saccharum Saccharum Saccharum hybrid cultivar },
    OWNER = { brugerolles },
    TIMESTAMP = { 2007.12.05 },
}

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