title: Organic matter breakdown in streams in a region of contrasting anthropogenic land use.
abstract: Streams provide ecosystem services to humans that depend on ecosystem functions, such as organic matter breakdown (OMB). OMB can be affected by land use-related disturbance. We measured OMB in 29 low-order streams in a region of contrasting land use in south-west Germany to quantify land use effects on OMB. We deployed fine and coarse mesh leaf bags in streams of forest, agricultural, vinicultural and urban catchments to determine the microbial and invertebrate-mediated OMB, respectively. Furthermore, we monitored physicochemical, geographical and habitat parameters to explain potential differences in OMB among land use types and sites. Only microbial OMB differed between land use types. Microbial OMB was negatively correlated with pH and invertebrate-mediated OMB was positively correlated with tree cover. Generally, OMB responded to stressor gradients rather than directly to land use. Therefore, the monitoring of specific stressors may be more relevant than land use to detect effects on ecosystem functions, and to extrapolate effects on functions, e.g. in the context of assessing ecosystem services.
authors.affiliation: Quantitative Landscape Ecology, Institute for Environmental Science, University of Koblenz-Landau, Fortstraße 7, D-76829 Landau, Germany. Electronic address: voss@uni-landau.de.
authors.forename: K
authors.initials: K
authors.lastname: Voß
authors.affiliation: Quantitative Landscape Ecology, Institute for Environmental Science, University of Koblenz-Landau, Fortstraße 7, D-76829 Landau, Germany.
authors.forename: D
authors.initials: D
authors.lastname: Fernández
authors.affiliation: Quantitative Landscape Ecology, Institute for Environmental Science, University of Koblenz-Landau, Fortstraße 7, D-76829 Landau, Germany.
authors.forename: R B
authors.initials: RB
authors.lastname: Schäfer
mesh_terms: D000383:Agriculture; D000818:Animals; D001673:Biodegradation, Environmental; D017753:Ecosystem; D004784:Environmental Monitoring; D005860:Germany, West; D007448:Invertebrates; D018515:Plant Leaves; D045483:Rivers / Q000737:chemistry; D014873:Water Pollutants / Q000032:analysis; D014876:Water Pollution / Q000706:statistics & numerical data
chemical_list: D014873:Water Pollutants
keywords: Ecosystem service; Land-use; Leaf decomposition; Regional scale; River