Publication: Caracterización ecofisiológica de la especie liquénica Cetraria islandica en la Sierra de Guadarrama
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2016-07
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Abstract
Cetraria islandica (L.) Ach. es uno de los componentes principales de la tundra brioliquénica alpina. Esta especie tiene una distribución ártico-alpina y mantiene poblaciones relictas en las altas montañas de la Península Ibérica. Aunque existe una abundante literatura sobre el comportamiento ecofisiológico de poblaciones polares y de montañas templadas, los datos sobre su funcionamiento en la región Mediterránea son aún escasos. Asumimos que se trata de una especie resistente a condiciones extremas, de crecimiento lento, adaptada a alta radiación y poca y esporádica disponibilidad de agua en verano. En este trabajo se ha evaluado la máxima capacidad de asimilación de CO2 de esta especie, pero también se han caracterizado sus óptimos fotosintéticos en relación a la luz e hidratación. La población que se ha estudiado es la que coloniza la cumbre de Dos Hermanas de la Sierra de Guadarrama, alrededor de 2.200m de altitud. Los resultados obtenidos se han comparado con los conocidos de zonas polares y montañas templadas y con el más abundante y representativo de los líquenes epífitos del medio forestal de la misma región, Pseudevernia furfurácea. Se han determinado adaptaciones al microclima alpino y a las regiones polares y templadas.
Cetraria islandica is one of the main components of the briolichenic alpine tundra. This species has an arctic-alpine distribution. In the Iberian Peninsula relict populations of this species can be found in the northern mountains and in the Central System. Although there is abundant literature on the ecophysiological behavior of polar and temperate mountains populations, data about its behaviour in the Mediterranean region are still scarce. We assume that this is a resistent species to extreme conditions, slow growth, adapted to high radiation and low and sporadic availability of water in summer. In this paper, it has been evaluated the maximum CO2 assimilation capacity of this species, but also it has been characterized their photosynthetic optimum relative to light and hydration. The study population is colonizing the Guadarrama summit of Dos Hermanas, at around 2.200 m a.s.l. The results obtained were compared with those already known of polar regions and temperate mountains and they were compared with the performance of the most abundant and representative of the epiphytic lichens forest environment in the same region, Pseudevernia furfuracea. Adaptations to alpine 2 microclimate and the polar and temperate regions have been determined.
Cetraria islandica is one of the main components of the briolichenic alpine tundra. This species has an arctic-alpine distribution. In the Iberian Peninsula relict populations of this species can be found in the northern mountains and in the Central System. Although there is abundant literature on the ecophysiological behavior of polar and temperate mountains populations, data about its behaviour in the Mediterranean region are still scarce. We assume that this is a resistent species to extreme conditions, slow growth, adapted to high radiation and low and sporadic availability of water in summer. In this paper, it has been evaluated the maximum CO2 assimilation capacity of this species, but also it has been characterized their photosynthetic optimum relative to light and hydration. The study population is colonizing the Guadarrama summit of Dos Hermanas, at around 2.200 m a.s.l. The results obtained were compared with those already known of polar regions and temperate mountains and they were compared with the performance of the most abundant and representative of the epiphytic lichens forest environment in the same region, Pseudevernia furfuracea. Adaptations to alpine 2 microclimate and the polar and temperate regions have been determined.
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Mención de Biología Ambiental