Publication: Ecología de la fase gametofitica y esporofitica de especies templadas de helechos rupicolas del género Asplenium L.
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2022-06-01
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Universidad Complutense de Madrid
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Abstract
La familia Aspleniaceae Newman es una de las familias más diversas de helechos letosporangiados, cuenta con dos géneros, de los cuales Asplenium L. es el más diverso. A pesar de que la Península Ibérica es considerada una región secundaria de diversidad para los helechos, los taxones de hábito rupícola pertenecientes al género Asplenium son especialmente abundantes en esta región. Dos de los taxones más abundantes y frecuentes son Asplenium trichomanes subsp. quadrivalens D.E. Mey. y Asplenium ceterach L. Estos dos taxones, comparativamente con otros del género, pueden considerarse generalistas, ya que otros presentan requerimientos ecológicos más estrictos. En este trabajo hemos evaluado los efectos de distintas variables ambientales relacionadas con la temperatura sobre rasgos de la cinética de germinación, el desarrollo gametofítico y rasgos funcionales del esporófito en A. trichomanes subsp. quadrivalens y A. ceterach, ya que cada una de estas etapas juega un papel fundamental en el establecimiento final de las especies. Para ello, se recolectaron en la Península Ibérica 65 individuos pertenecientes a 12 poblaciones de A. trichomanes subsp. quadrivalens y 55 individuos pertenecientes a 9 poblaciones de A. ceterach. En cada población se seleccionaron grietas expuestas, con una pendiente de 90º y orientación sur donde se recogieron al menos cuatro individuos de cada taxón...
The Aspleniaceae Newman is one of the most diverse families of letosporangiate ferns. It comprises two genera, of which the genus Asplenium L. is the most diverse. Although the Iberian Peninsula is considered a secondary region of diversity for ferns, the rupicolous taxa belonging to the genus Asplenium are especially abundant in this region. Two of the most abundant and frequent taxa are Asplenium trichomanes subsp. quadrivalens D.E. Mey. and Asplenium ceterach L. Both can be considered generalists compared to others in the genus, as others have stricter ecological requirements. In this work we evaluated the effects of different environmental variables related to temperature on germination kinetics, gametophytic development and sporophyte functional traits in A. trichomanes subsp. quadrivalens and A. ceterach, since each of these stages plays a fundamental role in the final establishment of species. For this purpose, 65 individuals belonging to 12 populations of A. trichomanes subsp. quadrivalens and 55 individuals belonging to 9 populations of A. ceterach were collected in the Iberian Peninsula. In each population, at least four individuals of each taxa were selected in exposed crevices with a 90º slope and south orientation...
The Aspleniaceae Newman is one of the most diverse families of letosporangiate ferns. It comprises two genera, of which the genus Asplenium L. is the most diverse. Although the Iberian Peninsula is considered a secondary region of diversity for ferns, the rupicolous taxa belonging to the genus Asplenium are especially abundant in this region. Two of the most abundant and frequent taxa are Asplenium trichomanes subsp. quadrivalens D.E. Mey. and Asplenium ceterach L. Both can be considered generalists compared to others in the genus, as others have stricter ecological requirements. In this work we evaluated the effects of different environmental variables related to temperature on germination kinetics, gametophytic development and sporophyte functional traits in A. trichomanes subsp. quadrivalens and A. ceterach, since each of these stages plays a fundamental role in the final establishment of species. For this purpose, 65 individuals belonging to 12 populations of A. trichomanes subsp. quadrivalens and 55 individuals belonging to 9 populations of A. ceterach were collected in the Iberian Peninsula. In each population, at least four individuals of each taxa were selected in exposed crevices with a 90º slope and south orientation...
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Tesis inédita de la Universidad Complutense de Madrid, Facultad de Ciencias Biológicas, leída el 25-03-2022