Anales del Jardín Botánico de Madrid, Vol 68, No 1 (2011)

Photosynthetic response and zonation of three species of Gelidiales from Tenerife, Canary Islands


https://doi.org/10.3989/ajbm.2280

S. Domíguez-Álvarez
Departamento de Biología Vegetal (Botánica), Universidad de La Laguna, La Laguna, Spain

J. M. Rico
Departamento de Biología de Organismos y Sistemas, Universidad de Oviedo, Oviedo, Spain

M. C. Gil-Rodríguez
Departamento de Biología Vegetal (Botánica), Universidad de La Laguna, La Laguna, Spain

Abstract


Three species of Gelidiales (Gelidium arbuscula, Gelidium canariense and Pterocladiella capillacea) (Rhodophyta) were selected due to their abundance in the marine lower intertidal of the north coast of the island of Tenerife (Canary Islands), to assess, using PAM fluorescence, the importance of irradiance and exposure to air on vertical distribution. We compared tolerance to emersion by air-drying fronds under simulated emersion, and results suggest that recovery of photosynthesis after emersion plays a major role in the vertical distribution of these three species. Morphological traits such as clumped fronds explain the higher tolerances, and reduced water loss of the species upper on the shore. Local differences between sites may be related to slight differences in the light regime related to topography.

Keywords


Canary Islands; ecophysiology; Gelidiales; Gelidium; photosynthesis; Pterocladiella

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