Effects of warming, nutrient enrichment and detritivore presence on litter breakdown and associated microbial decomposers in a simulated temperate woodland creek

Sanaei Moghadam, Fatameh and Zimmer, Martin (2016) Effects of warming, nutrient enrichment and detritivore presence on litter breakdown and associated microbial decomposers in a simulated temperate woodland creek Hydrobiologia, 770 (1). pp. 243-256. DOI 10.1007/s10750-015-2596-3.

[img] Text
art_10.1007_s10750-015-2596-3.pdf - Published Version
Restricted to Registered users only

Download (407Kb) | Contact

Supplementary data:

Abstract

Current scenarios of global environmental change predict rapid temperature increases, which can directly affect freshwater ecosystems. Leaf litter breakdown in aquatic environments constitutes a fundamental ecosystem process that is mediated by microbial decomposers and animal detritivores. In this study, we examined interactive effects of water temperature (two levels), nutrient concentration (two levels) and grazing pressure by Gammarus pulex (two levels) on breakdown rates of birch leaf litter, biomass and structure of the colonizing microbial community. Litter breakdown rates were stimulated by detritivores, with detritivore effects being enhanced by simultaneously increasing the temperature and adding the nutrients. The interaction between the three factors was synergistic and thus unpredictable from the effects of changes in individual factors. Bacterial community composition was affected by both detritivores and temperature, but less so by nutrient levels and fungal community composition changed upon detritivore activity but was independent of temperature and nutrients. These factors depended on each other in how they affected bacterial communities, but this did not prove true for fungal communities. Relative growth rates of G. pulex were not affected by temperature or nutrient level. We conclude that both abiotic and biotic factors that potentially affect ecosystem processes should be considered simultaneously in studies on effects of environmental change at the community and ecosystem level.

Document Type: Article
Additional Information: WOS:000372555100017
Keywords: Temperature; Nutrients; Leaf litter breakdown; Microbial decomposers; Detritivores
Research affiliation: Kiel University
OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EOE-B Experimental Ecology - Benthic Ecology
Refereed: Yes
DOI etc.: 10.1007/s10750-015-2596-3
ISSN: 0018-8158
Date Deposited: 21 Dec 2015 11:00
Last Modified: 04 May 2017 10:01
URI: http://eprints.uni-kiel.de/id/eprint/30696

Actions (login required)

View Item View Item

Document Downloads

More statistics for this item...