Riparian forests can mitigate warming and ecological degradation of agricultural headwater streams

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Turunen, J, Elbrecht, V, Steinke, D, Aroviita, J. Riparian forests can mitigate warming and ecological degradation of agricultural headwater streams. Freshw Biol. 2021; 66: 785– 798. https://doi.org/10.1111/fwb.13678

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Title: Riparian forests can mitigate warming and ecological degradation of agricultural headwater streams
Author: Turunen, Jarno; Elbrecht, Vasco; Steinke, Dirk; Aroviita, Jukka
Publisher: Blackwell Scientific
Date: 2021
Language: en
Belongs to series: Freshwater Biology 66: 4, 785-798
ISSN: 0046-5070
URI: http://hdl.handle.net/10138/336718
Abstract: 1. Riparian forests are commonly advocated as a key management option to mitigate the effects of agriculture on headwater stream biodiversity and ecosystem func tions. However, the benefits of riparian forests might be reduced by uninterrupted catchment-scale pollution. 2. We studied the effects of riparian land use on multiple ecological endpoints in head water streams in an agricultural landscape. We studied stream habitat characteristics, water temperature and algal accrual, and macrophyte, benthic macroinvertebrate and fish communities in 11 paired forested and open agricultural headwater stream reaches that differed in their extent of riparian forest cover but had similar water quality. 3. Hydromorphological habitat quality was higher in forested reaches than in open reaches. Riparian forest had a strong effect on the summer water temperature regime, with maximum and mean water temperatures and temperature variation in forested reaches substantially lower than in open reaches. 4. Macrophyte communities differed between forested and open reaches. The mean abundance of bryophytes was higher in forested reaches but the difference to open reaches was only marginally significant, whereas graminoids were significantly more abundant in open reaches. Within-stream dissimilarity of benthic macroinvertebrate community structure was significantly related to the difference in riparian land use between reach pairs. The relative DNA sequence abundance of pollution-sensitive Ephemeroptera, Plecoptera, and Trichoptera species tended to be higher in forested reaches than in open reaches. Finally, fish densities were not significantly different be tween forested and open reaches, although densities were higher in forested reaches. 5. This unequivocal evidence for the ecological benefits of forested riparian reaches in agricultural headwater streams suggests that riparian forest can partly mitigate the adverse impacts of agricultural diffuse pollution on biota. The strong effect of forests on stream water temperature suggest that riparian forest could also miti gate harmful effects on headwater stream biodiversity and ecosystem functions of the predicted more frequent high summer temperatures.
Subject: riparian forests
biodiversity
diffuse pollution
DNA metabarcoding
land use
water temperature
mitigation
agriculture
headwater stream
ecosystem functions
catchment-scale pollution
ecological endpoints
ecological benefits
stream habitat characteristics
algae
algal accrual
macrophyte
benthic macroinvertebrate
fish communities
hydromorphological habitat quality
forested reaches
open reaches
summer water temperature regime
temperature variation
bryophytes
graminoids
dissimilarity
riparian land use
Ephemeroptera
Plecoptera
Trichoptera
fish density
agricultural diffuse pollution on biota
harmful effects
high summer temperatures
warming
global warming
degradation
ecological degradation
agricultural
agricultural headwater streams
pollution
forests
coasts
water protection
agricultural areas
Subject (ysa): lämpötila
vesi
metsät
biodiversiteetti
saastuminen
maankäyttö
ekologinen tila
ranta-alueet
vesiensuojelu
lämpeneminen
virtavedet
maatalousalueet
DNA-viivakoodit
Rights: This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made. http://creativecommons.org/licenses/by-nc-nd/4.0/


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