Community Metabolism in Natural and Agriculturally Disturbed Riffle Sections of the Chippewa River, Isabella County, Michigan
作者:
StevenS. Brown,
DonnaK. King,
期刊:
Journal of Freshwater Ecology
(Taylor Available online 1987)
卷期:
Volume 4,
issue 1
页码: 39-51
ISSN:0270-5060
年代: 1987
DOI:10.1080/02705060.1987.9665159
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Estimates of aquatic community metabolism were made seasonally (1983–1984) at three sites representing an agricultural gradient along the Chippewa River. Annual mean photosynthesis/respiration ratios (P/R), monitored with anin situchamber method, demonstrated an autotrophic-heterotrophic shift consistent with increased farming intensity (P/R=1.31 vs 1.08 vs 0.64). Other productive and consumptive parameters supported those trends summarized in the P/R values. Within-site seasonal measurements indicated summer maxima and winter minima. Particle-sized organic content (AFDW) was determined for chamber sediments in order to locate the source of oxygen metabolism. While productive sections maintained populations of epilithic diatoms and filamentous green algae on relatively large substrates, the most disturbed site was heterotrophically dominated by very small particles.
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