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Reconfiguration as a prerequisite for survival in highly unstable flow-dominated habitats


Harder, DL and Speck, O and Hurd, CL and Speck, T, Reconfiguration as a prerequisite for survival in highly unstable flow-dominated habitats, Journal of Plant Growth Regulation, 23, (2) pp. 98-107. ISSN 0721-7595 (2004) [Refereed Article]

Copyright Statement

Copyright 2004 Springer Science+Business Media, Inc.

DOI: doi:10.1007/s00344-004-0043-1


Unstable and mechanically demanding habitats like wind-exposed open fields or the wave-swept intertidal require rapid adaptive processes to ensure survival. The mechanism of passive reconfiguration was analyzed in two plant models exposed to irregular flow of water or air, two species of the brown seaweed Durvillaea and the giant reed Arundo donax. Irrespective of the surrounding media and the subsequent Reynolds numbers (Re ~ 105 - 107), reconfiguration seems to be the key strategy for streamlining to avoid overcritical drag-induced loads. This passive mechanism is also discussed in the context of the requirement of a maximized surface area for light interception, so that morphological adaptations to rapid reconfiguration represent at least a bifactorial optimization. Both tested plant models exhibited the same principles in streamlining. At a specific threshold value, the proportionality between drag forces and flow velocity can be reduced from the second power close to an almost linear relation. This empirically derived relation could be characterized by a figure of merit or Vogel number (B). A value close to B = -1, resulting in a linear increase of drag force with velocity, was found at higher velocities for both the seaweeds and the giant reed, as well as for a variety of plants described in the literature. It is therefore concluded that the ability to reduce velocity-dependent drag force to a linear relation is a potentially important adaptation for plants to survive in unstable flow-dominated habitats.

Item Details

Item Type:Refereed Article
Keywords:kelp, Durvillaea, biomechanics, hydrodynamics, waves, reconfiguration, streamlining, vogel number, flow exposure, linear velocity dependency, biomechanics, drag force
Research Division:Biological Sciences
Research Group:Plant biology
Research Field:Phycology (incl. marine grasses)
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the biological sciences
UTAS Author:Hurd, CL (Professor Catriona Hurd)
ID Code:93129
Year Published:2004
Web of Science® Times Cited:81
Deposited By:IMAS Research and Education Centre
Deposited On:2014-07-14
Last Modified:2014-08-04

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