Stream restoration and ecosystem functioning in lowland streams
Research output: Contribution to journal › Journal article › Research › peer-review
Standard
Stream restoration and ecosystem functioning in lowland streams. / Baattrup-Pedersen, Annette; Alnoe, Anette Baisner; Rasmussen, Jes J.; Levi, Peter S.; Friberg, Nikolai; Riis, Tenna.
In: Ecological Engineering, Vol. 184, 106782, 2022.Research output: Contribution to journal › Journal article › Research › peer-review
Harvard
APA
Vancouver
Author
Bibtex
}
RIS
TY - JOUR
T1 - Stream restoration and ecosystem functioning in lowland streams
AU - Baattrup-Pedersen, Annette
AU - Alnoe, Anette Baisner
AU - Rasmussen, Jes J.
AU - Levi, Peter S.
AU - Friberg, Nikolai
AU - Riis, Tenna
PY - 2022
Y1 - 2022
N2 - Restoration has been increasingly applied over the last decades as a way to improve the ecological conditions in stream ecosystems, but documentation of the impact of restoration on ecosystem functions is sparse. Here, we applied a space-for-time approach to explore effects of stream restoration on metabolism and organic matter decomposition in lowland agricultural streams. We included stream reaches that were restored >10 years ago and compared ecosystem functioning in these streams with those in channelized and naturally meandering stream reaches from the same geographical region. Specifically, we tested the following hypotheses: 1) rates of stream metabolism (gross primary production, GPP, and ecosystem respiration, ER) and organic matter decomposition in restored reaches resemble rates in naturally meandering reaches more than rates in channelized stream reaches and 2) higher resemblance in ecosystem metabolism and organic matter decomposition between restored reaches and meandering reaches can be attributed to the improved physical habitat conditions in the restored stream reaches. Overall, we did not find that stream metabolism or organic matter decomposition differed among restored, channelized and naturally meandering stream reaches even though habitat conditions differed among the three stream types. Instead, we found a large variation in ecosystem function characteristics across all sites. When analyzing all stream types combined, we found that GPP increased with increasing plant coverage and that ER increased with increasing stream size and with the coverage of coarse substratum on the stream bottom. Organic matter decomposition, on the other hand, only slightly increased with the number of plant species and declined with increasing concentrations of nutrients. Overall, our findings suggest that physical habitat improvements in restored stream reaches can affect ecosystem functions, but also that the restoration outcome is context-dependent since many of the physical characteristics playing a role for the measured functions were only to some extent affected by the restoration and/or clouded by interference with factors operating at a larger-scale.
AB - Restoration has been increasingly applied over the last decades as a way to improve the ecological conditions in stream ecosystems, but documentation of the impact of restoration on ecosystem functions is sparse. Here, we applied a space-for-time approach to explore effects of stream restoration on metabolism and organic matter decomposition in lowland agricultural streams. We included stream reaches that were restored >10 years ago and compared ecosystem functioning in these streams with those in channelized and naturally meandering stream reaches from the same geographical region. Specifically, we tested the following hypotheses: 1) rates of stream metabolism (gross primary production, GPP, and ecosystem respiration, ER) and organic matter decomposition in restored reaches resemble rates in naturally meandering reaches more than rates in channelized stream reaches and 2) higher resemblance in ecosystem metabolism and organic matter decomposition between restored reaches and meandering reaches can be attributed to the improved physical habitat conditions in the restored stream reaches. Overall, we did not find that stream metabolism or organic matter decomposition differed among restored, channelized and naturally meandering stream reaches even though habitat conditions differed among the three stream types. Instead, we found a large variation in ecosystem function characteristics across all sites. When analyzing all stream types combined, we found that GPP increased with increasing plant coverage and that ER increased with increasing stream size and with the coverage of coarse substratum on the stream bottom. Organic matter decomposition, on the other hand, only slightly increased with the number of plant species and declined with increasing concentrations of nutrients. Overall, our findings suggest that physical habitat improvements in restored stream reaches can affect ecosystem functions, but also that the restoration outcome is context-dependent since many of the physical characteristics playing a role for the measured functions were only to some extent affected by the restoration and/or clouded by interference with factors operating at a larger-scale.
KW - Stream metabolism
KW - Leaf decomposition
KW - Microbial
KW - Shredder
KW - Agricultural streams
KW - Channelized
KW - Reference
KW - Restoration
KW - LEAF-LITTER DECOMPOSITION
KW - FRESH-WATER BIODIVERSITY
KW - NUTRIENT ENRICHMENT
KW - METABOLISM
KW - MACROPHYTE
KW - COMMUNITIES
KW - DIVERSITY
KW - BREAKDOWN
KW - LOCATION
KW - VELOCITY
U2 - 10.1016/j.ecoleng.2022.106782
DO - 10.1016/j.ecoleng.2022.106782
M3 - Journal article
VL - 184
JO - Ecological Engineering
JF - Ecological Engineering
SN - 0925-8574
M1 - 106782
ER -
ID: 329749512