2026-04-17T05:23:41Zhttps://recercat.cat/oai/request

oai:recercat.cat:10256/127302024-06-18T11:53:02Zcom_2072_452955com_2072_2054col_2072_452959col_2072_453077

00925njm 22002777a 4500 dc Artigas Alejo, Joan author Romaní i Cornet, Anna M. author Gaudes, Ainhoa author Muñoz Gràcia, Isabel author Sabater, Sergi author info:eu-repo/date/embargoEnd/2026-01-01 info:eu-repo/date/embargoEnd/2026-01-01 2009-10-01 1. We compared microbial biomass (bacteria, fungi, algae) and the activity of extracellular enzymes used in the decomposition of organic matter (OM) among different benthic substrata (leaves, coarse and fine substrata) over one hydrological year in a Mediterranean stream. 2. Microbial heterotrophic biomass (bacteria plus fungi) was generally higher than autotrophic biomass (algae), except during short periods of high light availability in the spring and winter. During these periods, sources of OM shifted towards autochthonous sources derived mainly from algae, which was demonstrated by high algal biomass and peptidase activity in benthic communities. 3. Heterotrophic activity peaked in the autumn. Bacterial and fungal biomass increased with the decomposition of cellulose and hemicellulose compounds from leaf material. Later, lignin decomposition was stimulated in fine (sand, gravel) and coarse (rocks, boulders and cobbles) substrata by the accumulation of fine detritus. 4. The Mediterranean summer drought provoked an earlier leaf fall. The resumption of the water flow caused the weathering of riparian soils and subsequently a large increase in dissolved organic carbon and nitrate, which led to growth of bacteria and fungi This study was funded by the projects CGL2005-06739-C02-01 ⁄02 of the Spanish Science Ministry. Additional funding was provided by the Fundación Banco Bilbao Vizcaya Argentaria (Project GLOBRIO). http://hdl.handle.net/10256/12730 Enzims extracel·lulars Extracellular enzymes Biofilms -- Mediterrània, Regió Biofilms -- Mediterranean Region Ecologia fluvial -- Mediterrània, Regió Stream ecology -- Mediterranean Region Ecologia microbiana -- Mediterrània, Regió Microbial ecology -- Mediterranean Region Organic matter availability structures microbial biomass and activity in a Mediterranean stream