1990
DOI: 10.1139/b90-340
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The dispersal of winged fruits and seeds differing in autorotative behaviour

Abstract: 1990. The dispersal of winged fruits and seeds differing in autorotative behaviour.Can. J. Bot. 68: 2693-2697. The application of micrometeorological models of heavy particle dispersal to winged diaspores (samaras) requires that the diaspores maintain stable flight and that descent velocity is constant with respect to vertical air motion. Others have argued that these assumptions may be invalid for autorotating samaras and that bilaterally symmetric samaras will disperse farther than asymmetric samaras in cond… Show more

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Cited by 16 publications
(15 citation statements)
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References 14 publications
(19 reference statements)
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“…Aerodynamic shape may introduce Bernoulli sailing (18), uplift on wing surfaces (19), and rotation (20). The effects of rotation can be parameterized by terminal velocity (21). Resolving other aerodynamic effects would require Ͻ1 mm resolution, which is currently impossible in canopy scale models.…”
Section: Discussionmentioning
confidence: 99%
“…Aerodynamic shape may introduce Bernoulli sailing (18), uplift on wing surfaces (19), and rotation (20). The effects of rotation can be parameterized by terminal velocity (21). Resolving other aerodynamic effects would require Ͻ1 mm resolution, which is currently impossible in canopy scale models.…”
Section: Discussionmentioning
confidence: 99%
“…Harper et al 1970, Howe andWestley 1986), but there have been few quantitative studies demonstrating that descent velocity increases with increasing seed mass. Within taxa, such a proportionality has been confirmed for the winged species of Pinus (Siggins 1933), but the relationship is weak or absent when unrelated taxa and/or different aerodynamic types are lumped together (Siggins 1933, Augspurger 1986, Greene and Johnson 1986). If a positive correlation between mass and descent velocity is correct within a single aerodynamic category, then a simple scaling hypothesis may be advanced.…”
Section: A Hypothesismentioning
confidence: 99%
“…The proportionality in (2) should also hold for plumed seeds or seeds lacking any conspicuous appendage (provided that the falling diaspore has a Reynolds number greater than about 100 and thus the drag coefficient is virtually a constant; cf. Greene and Johnson 1990b).…”
Section: A Hypothesismentioning
confidence: 99%
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