English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/121143
Compartir / Impacto:
Estadísticas
Add this article to your Mendeley library MendeleyBASE
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Título

Macrophyte Complexity Controls Nutrient Uptake in Lowland Streams

AutorLevi, Peter S.; Riis, Tenna; Alnøe, Anette B.; Peipoch, Marc ; Maetzke, Kamilla; Bruus, Christoffer; Baattrup-Pedersen, Annette
Palabras claveSubmerged aquatic vegetation
Epiphyton
15N
Stable isotope
Nitrogen
Ecosystem function
Habitat complexity
Heterogeneity
NH4
Fecha de publicación2015
EditorSpringer
CitaciónEcosystems : DOI: 10.1007/s10021-015-9872-y (2015)
ResumenMacrophytes act as ecosystem engineers in lowland stream ecosystems, enhancing habitat complexity and physical structure. Studies have demonstrated that macrophyte abundance and growth form can dictate the degree to which physical and biological stream characteristics are altered. However, few studies have investigated the influence of macrophytes and their speciesspecific variation in morphological complexity on functional processes, such as nutrient uptake. We injected 15N-labeled ammonium (15N-NH4 +) into four macrophyte- rich lowland streams in Denmark to quantify the uptake of NH4 + by macrophytes, epiphytic biofilms, benthic biofilms, and suspended particulate organic matter in the water column. Overall, macrophytes and their epiphytic biofilms accounted for 71–98% of the reach-weighted uptake across the study streams. While macrophytes had the highest rates of NH4 + uptake among the compartments we measured, the epiphytic biofilms had the highest uptake efficiency, ranging from 0.06 to 0.6 mg N mg Nbiomass -1 d-1. Among all compartments, the uptake efficiency was inversely related to the carbon-to-nitrogen ratio. Macrophyte complexity, expressed as leaf perimeter-to-area ratio (P:A), varied among the five species found in the study streams. The uptake rates by macrophyte species with high leaf P:A were, on average, an order ofmagnitude higher thanthe rates for species with simple leaf morphology (430 vs. 49 mg N m-2 d-1). In summary, our results indicate that macrophytes regulate stream function both via direct uptake of NH4 + from the water column and by providing a substrate for epiphytic biofilms. Furthermore, the effect of leaf architecture on nutrient uptake rates provides evidence that physical complexity can enhance ecosystem function.
Descripción18 páginas, 6 figuras, 6 tablas.
Versión del editorhttp://dx.doi.org/10.1007/s10021-015-9872-y
URIhttp://hdl.handle.net/10261/121143
DOI10.1007/s10021-015-9872-y
ISSN1432-9840
Aparece en las colecciones: (CEAB) Artículos
Ficheros en este ítem:
No hay ficheros asociados a este ítem.
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.