caa a22 4500 445892374 CHVBK 20180317145620.0 cr unu---uuuuu 170323e20110701xx s 000 0 eng 10.1007/s10750-011-0657-9 doi (NATIONALLICENCE)springer-10.1007/s10750-011-0657-9 Leaf litter breakdown in Mediterranean streams: effect of dissolved inorganic nutrients [Elektronische Daten] [Margarita Menéndez, Enrique Descals, Tecla Riera, Oscar Moya] Agricultural runoff and urban activities can increase the inputs of nitrogen (N) and phosphorus (P), into headwater streams, leading to eutrophication and thus substantially affecting the structure and functions of benthic communities. A high P concentration in water stimulates the activity of heterotrophic microorganisms associated with leaf litter and, hence, influences decomposition rates and the availability of detrital resources for macroinvertebrates. Litter breakdown of alder (Alnus glutinosa) leaves enclosed in coarse mesh bags was studied in five low-order Mediterranean streams with different trophic status defined by their soluble reactive phosphorus (SRP) concentrations. Decomposition rates differed significantly between these streams and increased with the eutrophication gradient, but these differences were not always related to the availability of P in water. Leaf mass loss was directly correlated with shredder density, but macroinvertebrate density and diversity were not related to P availability in water, and ammonium concentration had a negative effect on macroinvertebrate diversity and shredder relative abundance. A significantly positive effect of nitrate concentration in water on aquatic hyphomycete sporulation rates was observed, but there also was a negative effect of % ammonium on dissolved inorganic nitrogen (DIN). The predominantly available ionic form of DIN could thus affect the structure of the aquatic hyphomycete community. These results suggest that the response of litter decomposition to eutrophication in forested headwater streams is strongly influenced by local stream characteristics and by the nature of nutrient pollution. Springer Science+Business Media B.V., 2011 Decomposition nationallicence Nitrogen nationallicence Phosphorus nationallicence Aquatic hyphomycetes nationallicence Invertebrates nationallicence Mediterranean streams nationallicence Menéndez Margarita Departmento de Ecología, Universidad de Barcelona, Barcelona, Spain aut Descals Enrique Instituto Mediterráneo de Estudios Avanzados, IMEDEA, CSIC-Univ. Illes Balears, Esporles, 07190, Majorca, Spain aut Riera Tecla Departmento de Ecología, Universidad de Barcelona, Barcelona, Spain aut Moya Oscar Instituto Mediterráneo de Estudios Avanzados, IMEDEA, CSIC-Univ. Illes Balears, Esporles, 07190, Majorca, Spain aut Hydrobiologia Springer Netherlands 669/1(2011-07-01), 143-155 0018-8158 669:1<143 2011 669 10750 https://doi.org/10.1007/s10750-011-0657-9 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10750-011-0657-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Menéndez Margarita Departmento de Ecología, Universidad de Barcelona, Barcelona, Spain aut NATIONALLICENCE 700 1- Descals Enrique Instituto Mediterráneo de Estudios Avanzados, IMEDEA, CSIC-Univ. Illes Balears, Esporles, 07190, Majorca, Spain aut NATIONALLICENCE 700 1- Riera Tecla Departmento de Ecología, Universidad de Barcelona, Barcelona, Spain aut NATIONALLICENCE 700 1- Moya Oscar Instituto Mediterráneo de Estudios Avanzados, IMEDEA, CSIC-Univ. Illes Balears, Esporles, 07190, Majorca, Spain aut NATIONALLICENCE 773 0- Hydrobiologia Springer Netherlands 669/1(2011-07-01), 143-155 0018-8158 669:1<143 2011 669 10750 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer