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Why Be a Shrub?: a Basic Model and Hypotheses for the Adaptive Values of a Common Growth Form
University of Gothenburg.
Chalmers University of Technology ; University of Gothenburg,.
Linnaeus University, Faculty of Technology, Department of Forestry and Wood Technology.
2016 (English)In: Frontiers in Plant Science, ISSN 1664-462X, E-ISSN 1664-462X, Vol. 7, 1095Article in journal (Refereed) Published
Abstract [en]

Shrubs are multi-stemmed short woody plants, more widespread than trees, important in many ecosystems, neglected in ecology compared to herbs and trees, but currently in focus due to their global expansion. We present a novel model based on scaling relationships and four hypotheses to explain the adaptive significance of shrubs, including a review of the literature with a test of one hypothesis. Our model describes advantages for a small shrub compared to a small tree with the same above-ground woody volume, based on larger cross-sectional stem area, larger area of photosynthetic tissue in bark and stem, larger vascular cambium area, larger epidermis (bark) area, and larger area for sprouting, and faster production of twigs and canopy. These components form our Hypothesis 1 that predicts higher growth rate for a small shrub than a small tree. This prediction was supported by available relevant empirical studies (14 publications). Further, a shrub will produce seeds faster than a tree (Hypothesis 2), multiple stems in shrubs insure future survival and growth if one or more stems die (Hypothesis 3), and three structural traits of short shrub stems improve survival compared to tall tree stems (Hypothesis 4)—all hypotheses have some empirical support. Multi-stemmed trees may be distinguished from shrubs by more upright stems, reducing bending moment. Improved understanding of shrubs can clarify their recent expansion on savannas, grasslands, and alpine heaths. More experiments and other empirical studies, followed by more elaborate models, are needed to understand why the shrub growth form is successful in many habitats.

Place, publisher, year, edition, pages
2016. Vol. 7, 1095
National Category
Research subject
Natural Science, Ecology
URN: urn:nbn:se:lnu:diva-55089DOI: 10.3389/fpls.2016.01095ISI: 000380221600001PubMedID: 27507981OAI: diva2:950198
Available from: 2016-07-28 Created: 2016-07-28 Last updated: 2016-08-26Bibliographically approved

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