Benthic insects in Swedish lake‐outlet streams: patterns in species richness and assemblage structure

Benthic insects in Swedish lake‐outlet streams: patterns in species richness and assemblage... SUMMARY 1. We studied how species richness of three hierarchical insect species groups, namely all benthic, lotic and filtering taxa, were related to a number of environmental variables in a data set from fifteen Swedish lake outlets. 2. In partial least‐squares analyses, we found that size‐related factors (stream width, discharge) and velocity‐related factors (current velocity, substratum particle size) were positively associated, and productivity‐related factors (chlorophyll a, seston energy, conductivity) negatively associated, with the species richness of the three groups. 3. The weak and negative relationship of richness with productivity largely negated theoretical predictions, whereas the species‐environment results corroborated earlier findings from running water systems. 4. The most important factors associated with the species composition of the lake outlets studied included pH, lake area, discharge, channel width and detritus. 5. Of the filter feeders, most species of blackflies (Diptera: Simuliidae) showed a negative relationship with pH. 6. A nested subset analysis demonstrated that species‐poor sites did not have a subset of species found at more species‐rich sites in any of the three hierarchical groups. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Freshwater Biology Wiley

Benthic insects in Swedish lake‐outlet streams: patterns in species richness and assemblage structure

Freshwater Biology, Volume 34 (2) – Oct 1, 1995

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Publisher
Wiley
Copyright
Copyright © 1995 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0046-5070
eISSN
1365-2427
DOI
10.1111/j.1365-2427.1995.tb00888.x
Publisher site
See Article on Publisher Site

Abstract

SUMMARY 1. We studied how species richness of three hierarchical insect species groups, namely all benthic, lotic and filtering taxa, were related to a number of environmental variables in a data set from fifteen Swedish lake outlets. 2. In partial least‐squares analyses, we found that size‐related factors (stream width, discharge) and velocity‐related factors (current velocity, substratum particle size) were positively associated, and productivity‐related factors (chlorophyll a, seston energy, conductivity) negatively associated, with the species richness of the three groups. 3. The weak and negative relationship of richness with productivity largely negated theoretical predictions, whereas the species‐environment results corroborated earlier findings from running water systems. 4. The most important factors associated with the species composition of the lake outlets studied included pH, lake area, discharge, channel width and detritus. 5. Of the filter feeders, most species of blackflies (Diptera: Simuliidae) showed a negative relationship with pH. 6. A nested subset analysis demonstrated that species‐poor sites did not have a subset of species found at more species‐rich sites in any of the three hierarchical groups.

Journal

Freshwater BiologyWiley

Published: Oct 1, 1995

References

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