Clarifying the role of fire heat and daily temperature fluctuations as germination cues for Mediterranean Basin obligate seeders
Por favor, use este identificador para citar o enlazar este ítem:
http://hdl.handle.net/10045/38979
Título: | Clarifying the role of fire heat and daily temperature fluctuations as germination cues for Mediterranean Basin obligate seeders |
---|---|
Autor/es: | Santana, Víctor M. | Baeza, M. Jaime | Blanes, M. Carmen |
Grupo/s de investigación o GITE: | Gestión de Ecosistemas y de la Biodiversidad (GEB) |
Centro, Departamento o Servicio: | Universidad de Alicante. Departamento de Ecología |
Palabras clave: | Adaptation | Cistus albidus | Exaptation | Fire-adaptative trait | Fire heat | Post-fire germination | Rosmarinus officinalis | Seed bank dynamics | Seedling emergence | Temperature fluctuation | Ulex parviflorus |
Área/s de conocimiento: | Ecología |
Fecha de publicación: | ene-2013 |
Editor: | Oxford University Press |
Cita bibliográfica: | Annals of Botany. 2013, 111(1): 127-134. doi:10.1093/aob/mcs238 |
Resumen: | Background and Aims This study aims to determine the role that both direct effects of fire and subsequent daily temperature fluctuations play in the seed bank dynamics of obligate seeders from the Mediterranean Basin. The short yet high soil temperatures experienced due to passage of fire are conflated with the lower, but longer, temperatures experienced by daily fluctuations which occur after removing vegetation. These germination cues are able to break seed dormancy, but it is difficult to assess their specific level of influence because they occur consecutively after summer fires, just before the flush of germination in the wet season (autumn). Methods By applying experimental fires, seed treatments were imposed that combined fire exposure/non-fire exposure with exposure to microhabitats under a gradient of disturbance (i.e. gaps opened by fire, mechanical brushing and intact vegetation). The seeds used were representative of the main families of obligate seeders (Ulex parviflorus, Cistus albidus and Rosmarinus officinalis). Specifically, an assessment was made of (1) the proportion of seeds killed by fire, (2) seedling emergence under field conditions and (3) seeds which remained ungerminated in soil. Key Results For the three species studied, the factors that most influenced seedling emergence and seeds remaining ungerminated were microhabitats with higher temperature fluctuations after fire (gaps opened by fire and brushing treatments). The direct effect of fire decreased the seedling emergence of U. parviflorus and reduced the proportion of seeds of R. officinalis remaining ungerminated. Conclusions The relevance of depleting vegetation (and subsequent daily temperature fluctuation in summer) suggests that studies focusing on lower temperature thresholds for breaking seed dormancy are required. This fact also supports the hypothesis that the seeding capacity in Mediterranean Basin obligate seeders may have evolved as a response to a wide range of disturbances, and not exclusively to fire. |
Patrocinador/es: | V.M.S. has been supported by a VAli + d post-doctoral grant awarded by the Generalitat Valenciana. This research has been carried out as part of the RESILIEN (CGL 2011-30515-C02-02) and Consolider-Ingenio 2010 (GRACCIE CSD2007-00067) projects. CEAM is supported by the Generalitat Valenciana. |
URI: | http://hdl.handle.net/10045/38979 |
ISSN: | 0305-7364 (Print) | 1095-8290 (Online) |
DOI: | 10.1093/aob/mcs238 |
Idioma: | eng |
Tipo: | info:eu-repo/semantics/article |
Derechos: | © The Author 2012. Published by Oxford University Press on behalf of the Annals of Botany Company. This is a pre-copy-editing, author-produced PDF of an article accepted for publication in Annals of Botany following peer review. The definitive publisher-authenticated version "Annals of Botany. 2013, 111(1): 127-134" is available online at: http://dx.doi.org/10.1093/aob/mcs238 |
Revisión científica: | si |
Versión del editor: | http://dx.doi.org/10.1093/aob/mcs238 |
Aparece en las colecciones: | INV - GEB - Artículos de Revistas |
Archivos en este ítem:
Archivo | Descripción | Tamaño | Formato | |
---|---|---|---|---|
2013_Santana_etal_AoB_final.pdf | Versión final (acceso restringido) | 244,46 kB | Adobe PDF | Abrir Solicitar una copia |
2013_Santana_etal_AoB.pdf | Versión revisada (acceso abierto) | 175,28 kB | Adobe PDF | Abrir Vista previa |
Todos los documentos en RUA están protegidos por derechos de autor. Algunos derechos reservados.