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Effect of riparian structure, temperature and channel morphometry on detritus processing in channelized and natural woodland streams in southern Sweden

Vought, Lena LU ; Kullberg, Anders LU and Petersen, Robert C. (1998) In Aquatic Conservation 8(2). p.273-285
Abstract
1. Ten south Swedish streams were selected to represent two distinct types - natural woodland streams and channelized streams. Measurements were made on leaching, decomposition and microbial respiration of the dominant riparian vegetation (European Black Alder), structure of the benthic macroinvertebrate community, macroinvertebrates inhabiting leaf material, channel morphometry, macrophyte composition, water chemistry and total accumulated degree days.

2. Leaf decomposition rates were not significantly different when channelized streams were compared with natural woodland streams. In channelized streams the average decomposition rate was -0.0556±0.0337 (±S.D.) day-1 compared with -0.0457±0.0115 day-1 in natural woodland streams.... (More)
1. Ten south Swedish streams were selected to represent two distinct types - natural woodland streams and channelized streams. Measurements were made on leaching, decomposition and microbial respiration of the dominant riparian vegetation (European Black Alder), structure of the benthic macroinvertebrate community, macroinvertebrates inhabiting leaf material, channel morphometry, macrophyte composition, water chemistry and total accumulated degree days.

2. Leaf decomposition rates were not significantly different when channelized streams were compared with natural woodland streams. In channelized streams the average decomposition rate was -0.0556±0.0337 (±S.D.) day-1 compared with -0.0457±0.0115 day-1 in natural woodland streams.

3. There was significantly higher variation in leaf decomposition among the five channelized streams compared with the five natural streams (F-test, p<0.05). This was mainly due to extremely high decomposition rates in channelized streams colonized by emergent macrophytes.

4. Alder decomposition rates were low in channelized streams without macrophytes (-0.0053 °day-1), intermediate in natural streams (-0.0087 °day-1), and high in channelized streams with macrophytes (-0.0136 °day-1).

5. The shredder functional group ranged from 13 to 70% of the benthic community in the natural streams. Channelized streams had a more variable shredder population ranging from 0.5 to 80%. The highest values were found in channelized streams that had become colonized by macrophytes.

6. There was a significant difference in total accumulated degree days between the channelized (256 °day) and natural woodland streams (209 °day). This is most likely an effect of drainage tiles contributing warmer groundwater to the channelized streams during fall.

7. It is concluded that, contrary to the prevailing conceptual model of stream systems, decomposition rates and macroinvertebrate functions are not necessarily reduced in streams without riparian vegetation. The loss of the riparian canopy can stimulate emergent macrophytes which will provide autochthonous detritus for benthic communities. This will change benthic community structure and the life cycle strategies present. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
channelized, stream, functional group, invertebrates, leaf pack, decomposition, riparian, detritus
in
Aquatic Conservation
volume
8
issue
2
pages
273 - 285
publisher
John Wiley & Sons
external identifiers
  • scopus:0031860264
ISSN
1052-7613
DOI
10.1002/(SICI)1099-0755(199803/04)8:2<273::AID-AQC286>3.0.CO;2-X
language
English
LU publication?
yes
id
eebfaf51-94be-44ef-be46-9feb99aa2cd8 (old id 934318)
date added to LUP
2009-01-14 11:47:14
date last changed
2017-07-30 03:40:10
@article{eebfaf51-94be-44ef-be46-9feb99aa2cd8,
  abstract     = {1. Ten south Swedish streams were selected to represent two distinct types - natural woodland streams and channelized streams. Measurements were made on leaching, decomposition and microbial respiration of the dominant riparian vegetation (European Black Alder), structure of the benthic macroinvertebrate community, macroinvertebrates inhabiting leaf material, channel morphometry, macrophyte composition, water chemistry and total accumulated degree days. <br/><br>
2. Leaf decomposition rates were not significantly different when channelized streams were compared with natural woodland streams. In channelized streams the average decomposition rate was -0.0556±0.0337 (±S.D.) day-1 compared with -0.0457±0.0115 day-1 in natural woodland streams. <br/><br>
3. There was significantly higher variation in leaf decomposition among the five channelized streams compared with the five natural streams (F-test, p&lt;0.05). This was mainly due to extremely high decomposition rates in channelized streams colonized by emergent macrophytes. <br/><br>
4. Alder decomposition rates were low in channelized streams without macrophytes (-0.0053 °day-1), intermediate in natural streams (-0.0087 °day-1), and high in channelized streams with macrophytes (-0.0136 °day-1). <br/><br>
5. The shredder functional group ranged from 13 to 70% of the benthic community in the natural streams. Channelized streams had a more variable shredder population ranging from 0.5 to 80%. The highest values were found in channelized streams that had become colonized by macrophytes. <br/><br>
6. There was a significant difference in total accumulated degree days between the channelized (256 °day) and natural woodland streams (209 °day). This is most likely an effect of drainage tiles contributing warmer groundwater to the channelized streams during fall. <br/><br>
7. It is concluded that, contrary to the prevailing conceptual model of stream systems, decomposition rates and macroinvertebrate functions are not necessarily reduced in streams without riparian vegetation. The loss of the riparian canopy can stimulate emergent macrophytes which will provide autochthonous detritus for benthic communities. This will change benthic community structure and the life cycle strategies present.},
  author       = {Vought, Lena and Kullberg, Anders and Petersen, Robert C.},
  issn         = {1052-7613},
  keyword      = {channelized,stream,functional group,invertebrates,leaf pack,decomposition,riparian,detritus},
  language     = {eng},
  number       = {2},
  pages        = {273--285},
  publisher    = {John Wiley & Sons},
  series       = {Aquatic Conservation},
  title        = {Effect of riparian structure, temperature and channel morphometry on detritus processing in channelized and natural woodland streams in southern Sweden},
  url          = {http://dx.doi.org/10.1002/(SICI)1099-0755(199803/04)8:2<273::AID-AQC286>3.0.CO;2-X},
  volume       = {8},
  year         = {1998},
}