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Effects of stream predator richness on the prey community and ecosystem attributes.

Nilsson, Erika LU ; Olsson, Karin LU ; Persson, Anders LU ; Nyström, Per LU ; Svensson, Gustav and Nilsson, Ulf (2008) In Oecologia 157(4). p.641-651
Abstract
It is important to understand the role that different predators can have to be able to predict how changes in the predator assemblage may affect the prey community and ecosystem attributes. We tested the effects of different stream predators on macroinvertebrates and ecosystem attributes, in terms of benthic algal biomass and accumulation of detritus, in artificial stream channels. Predator richness was manipulated from zero to three predators, using two fish and one crayfish species, while density was kept equal (n = 6) in all treatments with predators. Predators differed in their foraging strategies (benthic vs. drift feeding fish and omnivorous crayfish) but had overlapping food preferences. We found effects of both predator species... (More)
It is important to understand the role that different predators can have to be able to predict how changes in the predator assemblage may affect the prey community and ecosystem attributes. We tested the effects of different stream predators on macroinvertebrates and ecosystem attributes, in terms of benthic algal biomass and accumulation of detritus, in artificial stream channels. Predator richness was manipulated from zero to three predators, using two fish and one crayfish species, while density was kept equal (n = 6) in all treatments with predators. Predators differed in their foraging strategies (benthic vs. drift feeding fish and omnivorous crayfish) but had overlapping food preferences. We found effects of both predator species richness and identity, but the direction of effects differed depending on the response variable. While there was no effect on macroinvertebrate biomass, diversity of predatory macroinvertebrates decreased with increasing predator species richness, which suggests complementarity between predators for this functional feeding group. Moreover, the accumulation of detritus was affected by both predator species richness and predator identity. Increasing predator species richness decreased detritus accumulation and presence of the benthic fish resulted in the lowest amounts of detritus. Predator identity (the benthic fish), but not predator species richness had a positive effect on benthic algal biomass. Furthermore, the results indicate indirect negative effects between the two ecosystem attributes, with a negative correlation between the amount of detritus and algal biomass. Hence, interactions between different predators directly affected stream community structure, while predator identity had the strongest impact on ecosystem attributes. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Detritus, Open system, Periphyton biomass, Prey diversity
in
Oecologia
volume
157
issue
4
pages
641 - 651
publisher
Springer
external identifiers
  • wos:000259191000009
  • scopus:51749114870
ISSN
1432-1939
DOI
10.1007/s00442-008-1097-8
language
English
LU publication?
yes
id
0aaa1567-cadb-4f8f-a0dd-49de69497edc (old id 1181620)
date added to LUP
2008-09-29 14:01:21
date last changed
2017-03-12 03:56:39
@article{0aaa1567-cadb-4f8f-a0dd-49de69497edc,
  abstract     = {It is important to understand the role that different predators can have to be able to predict how changes in the predator assemblage may affect the prey community and ecosystem attributes. We tested the effects of different stream predators on macroinvertebrates and ecosystem attributes, in terms of benthic algal biomass and accumulation of detritus, in artificial stream channels. Predator richness was manipulated from zero to three predators, using two fish and one crayfish species, while density was kept equal (n = 6) in all treatments with predators. Predators differed in their foraging strategies (benthic vs. drift feeding fish and omnivorous crayfish) but had overlapping food preferences. We found effects of both predator species richness and identity, but the direction of effects differed depending on the response variable. While there was no effect on macroinvertebrate biomass, diversity of predatory macroinvertebrates decreased with increasing predator species richness, which suggests complementarity between predators for this functional feeding group. Moreover, the accumulation of detritus was affected by both predator species richness and predator identity. Increasing predator species richness decreased detritus accumulation and presence of the benthic fish resulted in the lowest amounts of detritus. Predator identity (the benthic fish), but not predator species richness had a positive effect on benthic algal biomass. Furthermore, the results indicate indirect negative effects between the two ecosystem attributes, with a negative correlation between the amount of detritus and algal biomass. Hence, interactions between different predators directly affected stream community structure, while predator identity had the strongest impact on ecosystem attributes.},
  author       = {Nilsson, Erika and Olsson, Karin and Persson, Anders and Nyström, Per and Svensson, Gustav and Nilsson, Ulf},
  issn         = {1432-1939},
  keyword      = {Detritus,Open system,Periphyton biomass,Prey diversity},
  language     = {eng},
  number       = {4},
  pages        = {641--651},
  publisher    = {Springer},
  series       = {Oecologia},
  title        = {Effects of stream predator richness on the prey community and ecosystem attributes.},
  url          = {http://dx.doi.org/10.1007/s00442-008-1097-8},
  volume       = {157},
  year         = {2008},
}