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The relative influence of nutrients and habitat on stream metabolism in agricultural streams

Environmental Monitoring and Assessment

By:
, , , , and
DOI: 10.1007/s10661-009-1127-y

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Abstract

Stream metabolism was measured in 33 streams across a gradient of nutrient concentrations in four agricultural areas of the USA to determine the relative influence of nutrient concentrations and habitat on primary production (GPP) and respiration (CR-24). In conjunction with the stream metabolism estimates, water quality and algal biomass samples were collected, as was an assessment of habitat in the sampling reach. When data for all study areas were combined, there were no statistically significant relations between gross primary production or community respiration and any of the independent variables. However, significant regression models were developed for three study areas for GPP (r 2 = 0.79-0.91) and CR-24 (r 2 = 0.76-0.77). Various forms of nutrients (total phosphorus and area-weighted total nitrogen loading) were significant for predicting GPP in two study areas, with habitat variables important in seven significant models. Important physical variables included light availability, precipitation, basin area, and in-stream habitat cover. Both benthic and seston chlorophyll were not found to be important explanatory variables in any of the models; however, benthic ash-free dry weight was important in two models for GPP. ?? 2009 The Author(s).

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
The relative influence of nutrients and habitat on stream metabolism in agricultural streams
Series title:
Environmental Monitoring and Assessment
DOI:
10.1007/s10661-009-1127-y
Volume
168
Issue:
1-4
Year Published:
2010
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Environmental Monitoring and Assessment
First page:
461
Last page:
479
Number of Pages:
19