caa a22 4500 445383585 CHVBK 20180317143025.0 cr unu---uuuuu 170323e20110901xx s 000 0 eng 10.1007/s10021-011-9455-5 doi (NATIONALLICENCE)springer-10.1007/s10021-011-9455-5 Difficulty in Discerning Drivers of Lake Ecosystem Metabolism with High-Frequency Data [Elektronische Daten] [James Coloso, Jonathan Cole, Michael Pace] High-frequency measurements are increasingly available and used to model ecosystem processes. This growing capability provides the opportunity to resolve key drivers of ecosystem processes at a variety of scales. We use a unique series of high-frequency measures of potential predictors to analyze daily variation in rates of gross primary production (GPP), respiration (R), and net ecosystem production (NEP=GPP−R) for two north temperate lakes. Wind speed, temperature, light, precipitation, mixed layer depth, water column stability, chlorophyll a, chromophoric dissolved organic matter (CDOM), and zooplankton biomass were measured at daily or higher-frequency intervals over two summer seasons. We hypothesized that light, chlorophyll a, and zooplankton biomass would be strongly related to variability in GPP. We also hypothesized that chlorophyll a, CDOM, and temperature would be most strongly related to variability in R, whereas NEP would be related to variation in chlorophyll a and CDOM. Consistent with our hypotheses, chlorophyll a was among the most important drivers of GPP, R, and NEP in these systems. However, multiple regression models did not necessarily include the other variables we hypothesized as most important. Despite the large number of potential predictor variables, substantial variance remained unexplained and models were inconsistent between years and between lakes. Drivers of GPP, R, and NEP were difficult to resolve at daily time scales where strong seasonal dynamics were absent. More complex models with greater integration of physical processes are needed to better identify the underlying drivers of short-term variability of ecosystem processes in lakes and other systems. Springer Science+Business Media, LLC, 2011 lake metabolism nationallicence gross primary production nationallicence ecosystem respiration nationallicence net ecosystem production nationallicence chromophoric dissolved organic matter nationallicence high-frequency data nationallicence ecosystem drivers nationallicence multiple regression nationallicence Coloso James Department of Environmental Sciences, University of Virginia, 291 McCormick Rd, 22904, Charlottesville, Virginia, USA aut Cole Jonathan Cary Institute of Ecosystem Studies, P.O. Box AB, 12545, Millbrook, New York, USA aut Pace Michael Department of Environmental Sciences, University of Virginia, 291 McCormick Rd, 22904, Charlottesville, Virginia, USA aut Ecosystems Springer-Verlag 14/6(2011-09-01), 935-948 1432-9840 14:6<935 2011 14 10021 https://doi.org/10.1007/s10021-011-9455-5 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10021-011-9455-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Coloso James Department of Environmental Sciences, University of Virginia, 291 McCormick Rd, 22904, Charlottesville, Virginia, USA aut NATIONALLICENCE 700 1- Cole Jonathan Cary Institute of Ecosystem Studies, P.O. Box AB, 12545, Millbrook, New York, USA aut NATIONALLICENCE 700 1- Pace Michael Department of Environmental Sciences, University of Virginia, 291 McCormick Rd, 22904, Charlottesville, Virginia, USA aut NATIONALLICENCE 773 0- Ecosystems Springer-Verlag 14/6(2011-09-01), 935-948 1432-9840 14:6<935 2011 14 10021 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer