English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/2991
Compartir / Impacto:
Estadísticas
Add this article to your Mendeley library MendeleyBASE
Citado 23 veces en Web of Knowledge®  |  Ver citas en Google académico
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar otros formatos: Exportar EndNote (RIS)Exportar EndNote (RIS)Exportar EndNote (RIS)
Título

Importance of within-shoot epiphyte distribution for the carbon budget of seagrasses: the example of Posidonia oceanica

Autor Alcoverro, Teresa ; Pérez, Marta M.; Romero Martinengo, Javier
Palabras clave Carbon balance
Irradiance
Mediterranean Sea
Photosynthesis
Seagrass
Fecha de publicación sep-2004
EditorWalter de Gruyter
Citación Botanica Marina 47, 4: 307-312 (2004).
http://dx.doi.org/10.1515/BOT.2004.036
ResumenTo assess the effects of shading by epiphytes on the carbon balance of the seagrass Posidonia oceanica, we examined the patterns of within-shoot epiphyte abundance on leaves, and their variability with season and depth. Epiphyte biomass was found to depend on leaf age (larger epiphyte load on older tissues), leaf side (more epiphytes on the inner face than on the outer) and depth (more epiphytes in deep meadows). Depth differences were maximum in spring and disappeared in late summer. Percent light absorbed (absorptance) by epiphytes was measured; light absorptance followed an exponential- saturated model with epiphyte biomass. Combining these data of percent light absorbed, within-shoot epiphyte biomass distribution and an existing carbon balance model, we conclude that reduction in carbon gains caused by epiphyte shading is relatively small, and greater in deep meadows (8.8% on average, with values up to 14.2% in May) than that in shallow water (4.7% on average with maximum values of 7% in August). This is mainly due to the accumulation of epiphytes on old tissues, which contribute only marginally to the carbon gain of the plant. Using the same procedure, we modelled the effects of a doubling in epiphyte biomass, conserving the observed within-shoot distribution. The result was a very small additional carbon loss. However, using the same biomass but modifying the distribution (shifting the same abundance towards younger leaf age classes), the reduction in carbon gains was dramatic, particularly in deep meadows (between 21% and 41%, depending on the shift used). Therefore, it is the epiphyte growth timing rate rather than the final biomass reached which seems to be a key control for Posidonia oceanica survival, especially near the deep limit of its distribution.
URI http://hdl.handle.net/10261/2991
DOI10.1515/BOT.2004.036
ISSN0006-8055
Aparece en las colecciones: (CEAB) Artículos
Ficheros en este ítem:
Fichero Descripción Tamaño Formato  
nutrient.pdf1,04 MBAdobe PDFVista previa
Visualizar/Abrir
Mostrar el registro completo
 



NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.