English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/135328
COMPARTIR / IMPACTO:
Estadísticas
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:
Título

Silicon consumption in two shallow-water sponges with contrasting biological features

AutorLópez-Acosta, María ; Leynaert, Aude; Maldonado, Manuel ; Maldonado, Manuel
Fecha de publicación2016
EditorAmerican Society of Limnology and Oceanography
CitaciónLimniology and Oceanography : doi: 10.1002/lno.10359 (2016)
ResumenThere is growing awareness that to improve the understanding of the biological control of silicon (Si) cycling in the oceans, the biogeochemical models need to incorporate Si users other than diatoms. In the last decades, siliceous sponges are coming into sight as important Si users, but the scarce quantitative information on how they use Si is hindering the assessment of their role. We are here investigating Si consumption kinetics in two demosponge species (Tethya citrina and Hymeniacidon perlevis) that have contrasting biological features while inhabiting at the same sublittoral habitat. In laboratory experiments, we have determined that both species share some common traits when incorporating Si from seawater: (1) saturable Michaelis-Menten kinetics; (2) maximum velocity of Si consumption occurring at high silicic acid (DSi) concentrations ( 150 lM) that are not available in shallow waters of the modern oceans; (3) the ability to increase consumption rates rapidly and predictably in response to increasing DSi availability; and (4) halfsaturation constants that indicate an affinity for DSi lower than those of diatom systems. Across the four sponge species investigated to date, the affinity for DSi varies about 4.5 times. Our results also suggest that at least part of that between-species variability reflects the skeletonization level of the species. Within a given species, there are also between-individual differences in the DSi demand, which appear to reflect the particular physiological condition of each individual (i.e., body size, reproductive vs. non-reproductive stage).
Descripción12 páginas, 4 figuras.
Versión del editorhttp://dx.doi.org/10.1002/lno.10359
URIhttp://hdl.handle.net/10261/135328
DOI10.1002/lno.10359
ISSN0024-3590
Aparece en las colecciones: (CEAB) Artículos
Ficheros en este ítem:
Fichero Descripción Tamaño Formato  
restringido.pdf21,67 kBAdobe PDFVista previa
Visualizar/Abrir
Mostrar el registro completo
 

Artículos relacionados:


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