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Browsing Maestrías by Subject "Andes Ecuador - Antisana"

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    Ecophysiological strategies to daily air temperature variations in two key species in the northwestern slope of the superpáramo of the Antisana volcano
    (PUCE - Quito, 2016) Jaramillo Terán, Ricardo Mauricio; Muriel Mera, Erika Priscilla
    Background: Tropical alpine plants experience daily freezing risk, yet little is known about the interaction between their surroundings and thermal traits. Existent studies are based on information taken over short periods of time, which does not allow to understand the effects of inter-annual climate variations on plants.􀀁 Aims:􀀁 To evaluate if Werneria nubigena and Xenophyllum rigidum present similar response mechanisms to freezing, determine if their inner leaf temperature (ILT) is controlled by microhabitat conditions, and if the exotherm temperature variation depends on the correspondent response to freezing. Methods: We measured the ILT and the micro environmental temperature, and evaluated the exotherm and freezing injury temperature (LT50), on the Antisana Volcano.􀀁 Results: The thermal niche of both species was warmer than the registered ILT. The exotherm and LT50 relation revealed that both species presented a tolerance mechanism to freezing with an inversed relation with elevation. Microhabitat substrates (rock and vascular plants) surrounding the plants determined the exposure to freezing for both species, having a significant inverse relation with the ILT. Conclusions:􀀁 Our results indicate that independently of their tolerance mechanism, microhabitat conditions could be the primary filter when determining the exposure of these tropical alpine species to air freezing temperatures.