Morphological variation of two taxonomically distant plant species along a natural flow velocity gradient.
New Phytol
; 163(3): 651-660, 2004 Sep.
Article
em En
| MEDLINE
| ID: mdl-33873737
ABSTRACT
⢠The similarity of morphological plastic response to physical stress has been poorly tested among distant plant taxons as yet. ⢠The effect of flow stress was compared for two species -Berula erecta and Mentha aquatica- through 14 morphological traits measured for five sets of 30 individuals in five patches organised along a natural velocity gradient. Size-dependent and size-corrected traits were analysed by single correlations and multivariate analyses. ⢠B. erecta exhibited the expected pattern, that is a sharp decrease of all but one size-dependent trait as velocity increased. Five and four size-corrected traits were correlated with velocity, for B. erecta and M. aquatica, respectively, but three of them showed an opposite trend for the two species. Within-patch trait variability, as hypothesized, tended to decrease with velocity for B. erecta. ⢠The two species exhibited partly opposite responses despite the involvement of common traits. Small size allowed B. erecta to escape flow stress, whereas M. aquatica acquired a more streamlined morphology. The adaptive value of these morphological adjustments should be assessed through drag measurements.
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01-internacional
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MEDLINE
Idioma:
En
Ano de publicação:
2004
Tipo de documento:
Article