James Cloern
James (Jim) Cloern is a senior scientist emeritus at the U.S. Geological Survey's Water Resources Mission Area in Menlo Park, California.
James (Jim) Cloern is a senior scientist emeritus at the U.S. Geological Survey in Menlo Park, California. His research over four decades addresses comparative ecology and biogeochemistry of estuaries to understand how they respond as ecosystems to climatic-hydrologic variability and human disturbance. His team investigation of San Francisco Bay included studies of primary production, nutrient cycling, algal and zooplankton community dynamics, ecosystem metabolism and food web dynamics, disturbance by introduced species, ecosystem restoration, and past and projected future responses to a changing climate. His career achievements have been recognized with selection as Fellows of the American Geophysical Union (AGU) and Association for the Sciences of Limnology and Oceanography (ASLO), and as recipient of the Woods Hole Oceanographic Institution B.H. Ketchum Award, Delta Science Program Brown-Nichols Achievement Award, ASLO Ruth Patrick Award, Coastal and Estuarine Research Federation Odum Lifetime Achievement Award, and Department of Interior's Distinguished Service Award. He is currently an Adjunct Senior Fellow at the Public Policy Institute of California, a member of the Delta Stewardship Council's Independent Science Board, and editor-in-chief of Limnology and Oceanography Letters.
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Empirical model of Skeletonema costatum photosynthetic rate, with applications in the San Francisco Bay estuary
A von Bertalanffy growth model with a seasonally varying coefficient
Simulation model of Cryptomonas ovata population dynamics in southern Kootenay Lake, British Columbia
Effects of light intensity and temperature on Cryptomonas ovata (Cryptophyceae) growth and nutrient uptake rates
Recent limnological changes in southern Kootenay Lake, British Columbia
The survival of coho salmon (Oncorhynchus kisutch) eggs in two Wisconsin tributaries of Lake Michigan
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Empirical model of Skeletonema costatum photosynthetic rate, with applications in the San Francisco Bay estuary
An empirical model of Skeletonema costatum photosynthetic rate is developed and fit to measurements of photosynthesis selected from the literature. Because the model acknowledges existence of: 1) a light-temperature interaction (by allowing optimum irradiance to vary with temperature), 2) light inhibition, 3) temperature inhibition, and 4) a salinity effect, it accurately estimates photosyntheticAuthorsJames E. CloernA von Bertalanffy growth model with a seasonally varying coefficient
The von Bertalanffy model of body growth is inappropriate for organisms whose growth is restricted to a seasonal period because it assumes that growth rate is invariant with time. Incorporation of a time-varying coefficient significantly improves the capability of the von Bertalanffy equation to describe changing body size of both the bivalve mollusc Macoma balthicain San Francisco Bay and the flaAuthorsJames E. Cloern, Frederic H. NicholsSimulation model of Cryptomonas ovata population dynamics in southern Kootenay Lake, British Columbia
A one-dimensional transient model is developed to simulate observed population dynamics of a small flagellate (Cryptomonas ovata) in southern Kootenay Lake, B.C., during a 1-year period (1 June 1974-31 May 1975). The model considers advective displacement of C. ovata as water flows from its southern entrance into the lake and moves northward toward sampling sites. Specific growth rate is computedAuthorsJames E. CloernEffects of light intensity and temperature on Cryptomonas ovata (Cryptophyceae) growth and nutrient uptake rates
Specific growth rate of Cryptomonas ovata var. palustris Pringsheim was measured in batch culture at 14 light-temperature combinations. Both the maximum growth rate (μm) and optimum light intensity (Iopt) fit an empirical function that increases exponentially with temperature up to an optimum (Topt), then declines rapidly as temperature exceeds Topt. Incorporation of these functions into Steele'sAuthorsJames E. CloernRecent limnological changes in southern Kootenay Lake, British Columbia
n response to a significant abatement of phosphate loading and the construction of a dam on its major inflow (the Kootenay River), southern Kootenay Lake experienced a number of limnological changes between 1969 and 1974. Water temperatures in 1974–1975 were similar to those previously reported for 1966–1969. However, water transparency has increased, particularly during the spring months.NitrateAuthorsJames E. CloernThe survival of coho salmon (Oncorhynchus kisutch) eggs in two Wisconsin tributaries of Lake Michigan
Natural reproduction of coho salmon (Oncorhynchus kisutch) in two Wisconsin tributaries of Lake Michigan (Little Scarboro Creek, Kewaunee Co., and Fischer Creek, Manitowoc Co.), is limited by an unusually high mortality of eggs and preemergent embryos. Of approximately 1800 coho salmon eggs planted in six study redds (spawning beds) within Fischer Creek (November 1972), none survived to hatching.AuthorsJames E. Cloern