English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/126058
logo share SHARE   Add this article to your Mendeley library MendeleyBASE
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:


Procesado de hojarasca en arroyos del Parque Nacional de la Sierra de Guadarrama (Madrid)

Other TitlesLeaf litter breakdown in streams of Sierra de Guadarrama National Park (Madrid)
AuthorsCasado, Carmen; Mollá, Salvador; González, José Manuel; Roblas, Neftalí; Descals, Enric
KeywordsBreakdown rate
litter bags
siliceous headwater mountain streams
aquatic hyphomycetes
Issue Date2015
PublisherAsociación Ibérica de Limnología
CitationLimnetica 34(1): 115-134 (2015)
Abstract© Asociación Ibérica de Limnología Madrid. The main goal of this study was to identify the main drivers of natural variability of leaf litter processing in six well preserved Mediterranean mountain streams in the Sierra de Guadarrama, through the analysis of the breakdown rates of alder litter, content and dynamics of leaf nutrients, and associated fungal and invertebrates communities. In general, breakdown rates of alder leaves, both exponential (k = 0.013 ± 0.005 dd<sup>-1</sup>, k′ = 0.041 ± 0.011 d<sup>-1</sup>) and lineal (b = 0.470 ± 0.121% PSLC dd<sup>-1</sup>, b′ = 1.522 ± 0.153% PSLC d<sup>-1</sup>) were very high. Variability in breakdown rates among streams was not correlated to environmental characteristics (discharge, slope or water temperature) neither to stream water characteristics (nutrient concentration, pH, or conductivity). This may be due to the low environmental heterogeneity observed among these streams and also because the physical factors that could regulate this process were outweighed by biological processes that mask them. The highest breakdown rates were recorded in the coldest waters where the activity of decomposers aquatic fungi was very low (measured by sporulation rates, 98.36 ± 148.84 conidia mg<sup>-1</sup> PSLC d<sup>-1</sup>), suggesting that consumer invertebrates played a key role in the faster leaf litter processing rates in these sites. Family richness (13.67 ± 3.44 fam. bag<sup>-1</sup>) and macroinvertebrate density (25.33 ± 10.42 ind bag<sup>-1</sup>), as well as shredder density (16.17 ± 7.44 ind bag<sup>-1</sup>) did not show any relationship with the breakdown rates (p > 0.100, neither linear nor exponential rates). A positive relationship was only found between percentage of leaf litter lost and abundance of Limnephilid (p < 0.010), that pointed out a higher relevance of shredder traits than their total abundance. Limnephilid are caddisfly shredders adapted to low thermal regimes, they have large body and are able to feed on unconditioned litter debris and poor colonized by aquatic hyphomycetes, which seem to exert a decisive control over leaf litter processing rate in this type of aquatic ecosystems. Therefore, we can suppose that in colder headwater mountain streams consumer macroinvertebrates (shredders) might have a major relevance in the processing of litter debris whereas decomposers (aquatic hyphomycetes) would play an increasing role in warmer streams.
Identifiersissn: 1989-1806
Appears in Collections:(IMEDEA) Artículos
Files in This Item:
File Description SizeFormat 
accesoRestringido.pdf15,38 kBAdobe PDFThumbnail
Show full item record
Review this work

WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.