@inbook{678325d75a7f4ca682769f7ff577ce09,
title = "Periphyton metabolism: A chamber approach",
abstract = "In lotic ecosystems, the metabolism of periphyton is influenced strongly by natural and anthropogenic disturbances such as floods. Using recirculating metabolism chambers, we measured the metabolic activity of the Cladophora g/omerafa-dominated periphyton community in the Glen Canyon Dam tailwater, in relation to the 1996 controlled flood. Because scouring removes senescent plant material and detritus from periphyton, we hypothesized that productivity rates and the gross productivity/respiration (P/R) ratio of the periphyton community would be greater after the flood. Gross and net primary production (as chlorophyll-a) increased significantly after the flood and an approximately 2-fold increase was observed in net daily metabolism. Mean P/R ratio increased significantly from 1.3 in the pre-flood community to 2.6 in the post-flood community. Following the flood, periphyton on the rocks exhibited increased photosynthetic efficiency relative to measurements made before the flood. Given the importance of primary producers in desert rivers, such changes have implications for ecologically sound management of the Colorado and other rivers.",
author = "Brock, {James T.} and Royer, {Todd V.} and Snyder, {Eric B.} and Thomas, {Steven A.}",
note = "Funding Information: Acknowledgments. We thank Dick Marzolf (U.S. Geological Survey) for reviewing an earlier draft of the manuscript and for encouraging us to apply our interest in metabolism of the Glen Canyon Dam tailwater to the 1996 controlled flood. Rapid Creek Research, Inc. provided equipment and transportation for the study. The Stream Ecology Center at Idaho State University loaned metabolism chambers and related equipment. We thank G. Wayne Minshall for encouragement and suggestions. The helpful comments of two anonymous reviewers substantially improved this paper. Cost of travel and laboratory analyses was partly funded by the U.S. Geological Survey. Ted McKinney and Andrew Ayers (Arizona Game and Fish Department) kindly collected sample material, and Dianne Stanitski-Martin provided data on solar radiation. Publisher Copyright: {\textcopyright} 1999 by the American Geophysical Union.",
year = "1999",
doi = "10.1029/GM110p0217",
language = "English (US)",
isbn = "9780875900933",
series = "Geophysical Monograph Series",
publisher = "Blackwell Publishing Ltd",
pages = "217--223",
editor = "Webb, {Robert H.} and {Richard Marzolf}, G. and Schmidt, {John C.} and Valdez, {Richard A.}",
booktitle = "The Controlled Flood in Grand Canyon, 1999",
}