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The role of the regeneration niche for the vertical stratification of vascular epiphytes

Published online by Cambridge University Press:  23 May 2013

Katrin Wagner ,
Wiebke Bogusch  and
Gerhard Zotz
Katrin Wagner*
Affiliation:
Universität Oldenburg, Institut für Biologie und Umweltwissenschaften, AG Funktionelle Ökologie, Postfach 2503, D-26111 Oldenburg, Germany
Wiebke Bogusch
Affiliation:
Universität Oldenburg, Institut für Biologie und Umweltwissenschaften, AG Funktionelle Ökologie, Postfach 2503, D-26111 Oldenburg, Germany
Gerhard Zotz
Affiliation:
Universität Oldenburg, Institut für Biologie und Umweltwissenschaften, AG Funktionelle Ökologie, Postfach 2503, D-26111 Oldenburg, Germany Smithsonian Tropical Research Institute, Apartado Postal 0843-03092, Balboa, Ancón, Panamá, República de Panamá
*
1Corresponding author. Email: [email protected]
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Abstract:

Vertical stratification of vascular epiphytes is frequently attributed to niche partitioning along microclimatic gradients but experimental confirmations of this notion are rare. This study investigates the role of the regeneration phase for the stratification of five bromeliad (Catopsis sessiliflora, Guzmania subcorymbosa, Tillandsia anceps, T. bulbosa and Werauhia gladioliflora) and seven aroid species (Anthurium acutangulum, A. brownii, A. clavigerum, A. durandii, A. friedrichsthalii, A. hacumense and A. scandens) in a Panamanian rain forest. We documented gradients of temperature, vapour pressure deficit and light (n = 10 d) as well as species height distributions (n = 11–120). Microclimatic gradients were substantial (maximal T and RH differences between strata: 5 °C and 18%, respectively) and mean attachment heights of the study species (range = 4–21 m) differed significantly. We tested sensitivity to recurrent drought (four treatments) during germination (all species, cumulative germination of 20 seeds, n = 3) and seedling growth (four aroid species, n = 25). Seedling survival of six aroid species transplanted to three heights (n = 27) was monitored in situ. Some species did not germinate under severe recurrent drought while others germinated at the same rate in all treatments. Seedlings of the most exposed species grew fastest under intermediate recurrent drought while those of the other three species grew fastest when kept constantly wet. Survival of transplanted seedlings did not depend on species attachment height, but this may be attributable to insufficient statistical power. Taken together, the results suggest that the stratification can be explained to a large degree by differential sensitivity to the vertical moisture gradient during the regeneration phase.

Keywords

AnthuriumAraceaeBromeliaceaeCatopsisCentral AmericagerminationGuzmaniamicroclimatic gradientseedlingsTillandsiatropical rain forestWerauhia
Type
Research Article
Information
Journal of Tropical Ecology , Volume 29 , Issue 4 , July 2013 , pp. 277 - 290
Copyright
Copyright © Cambridge University Press 2013 

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