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16-04-2018 | Research Article

Local geology determines responses of stream producers and fungal decomposers to nutrient enrichment: A field experiment

Authors: Heikki Mykrä, Romain Sarremejane, Tiina Laamanen, Satu Maaria Karjalainen, Annamari Markkola, Sirkku Lehtinen, Kaisa Lehosmaa, Timo Muotka

Published in: Ambio

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Abstract

We examined how short-term (19 days) nutrient enrichment influences stream fungal and diatom communities, and rates of leaf decomposition and algal biomass accrual. We conducted a field experiment using slow-releasing nutrient pellets to increase nitrate (NO3-N) and phosphate (PO4-P) concentrations in a riffle section of six naturally acidic (naturally low pH due to catchment geology) and six circumneutral streams. Nutrient enrichment increased microbial decomposition rate on average by 14%, but the effect was significant only in naturally acidic streams. Nutrient enrichment also decreased richness and increased compositional variability of fungal communities in naturally acidic streams. Algal biomass increased in both stream types, but algal growth was overall very low. Diatom richness increased in response to nutrient addition by, but only in circumneutral streams. Our results suggest that primary producers and decomposers are differentially affected by nutrient enrichment and that their responses to excess nutrients are context dependent, with a potentially stronger response of detrital processes and fungal communities in naturally acidic streams than in less selective environments.

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Metadata
Title
Local geology determines responses of stream producers and fungal decomposers to nutrient enrichment: A field experiment
Authors
Heikki Mykrä
Romain Sarremejane
Tiina Laamanen
Satu Maaria Karjalainen
Annamari Markkola
Sirkku Lehtinen
Kaisa Lehosmaa
Timo Muotka
Publication date
16-04-2018
Publisher
Springer Netherlands
Published in
Ambio
Print ISSN: 0044-7447
Electronic ISSN: 1654-7209
DOI
https://doi.org/10.1007/s13280-018-1057-4