Leaves of rosette-forming plants capture fog by having a narrow form.

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References

“Plants that use fog as an important watersource frequently have a
rosette growth habit. The performance of this morphology in relation to
fog interception has not been studied. Some first-principles from
physics predict that narrow leaves, together with other ancillary
traits (large number and high flexibility of leaves, caudices, and/or
epiphytism) which constitute the ‘‘narrow-leaf syndrome’’ should
increase fog interception efficiency. This was tested using aluminum
models of rosettes that differed in leaf length, width and number and
were exposed to artificial fog. The results were validated using seven
species of Tillandsia and four species of xerophytic rosettes.
The total amount of fog intercepted in rosette plants increased with
total leaf area, while narrow leaves maximized interception efficiency
(measured as interception per unit area). The number of leaves in the
rosettes is physically constrained because wide leafed plants can only
have a few blades. At the limits of this constraint, net fog
interception was independent of leaf form, but interception efficiency
was maximized by large numbers of narrow leaves. Atmospheric Tillandsia
species show the narrow-leaf syndrome. Their fog interception
efficiencies were correlated to the ones predicted from aluminum-model
data. In the larger xerophytic rosette species, the interception
efficiency was greatest in plants showing the narrow-leaf syndrome. The
adaptation to fog-harvesting in several narrow-leaved rosettes was
tested for evolutionary convergence in 30 xerophytic rosette species
using a comparative method. There was a significant evolutionary
tendency towards the development of the narrow-leaf syndrome the closer
the species grew to areas where fog is frequently available. This study
establishes convergence in a very wide group of plants encompassing
genera as contrasting as Tillandsia and Agave as a result of their dependence on fog.” (Martorell and Ezcurra 2007:561)

Journal article
The narrow-leaf syndrome: a functional and evolutionary approach to the form of fog-harvesting rosette plantsOecologiaDecember 19, 2006
Carlos Martorell, Exequiel Ezcurra

Journal article
Rosette scrub occurrence and fog availability in arid mountains of MexicoJ Veg SciJuly 21, 2006
Carlos Martorell, Exequiel Ezcurra

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Living System/s

Organism
Tillandsia chaetophyllaSpecies

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