W. Herbert Senft's research while affiliated with Ball State University and other places
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Publications (5)
The growth of Volvox globator L. and Volvox aureus Ehr. was measured at five temperatures and nine phosphorus concentrations. Growth rates were hyperbolically related to phosphorus concentrations for all temperatures using a Monod growth model. Optimal growth rates of 1.17 and 1.00 doublings d−1 were obtained at 20°C for V. globator and V. aureus,...
The production of oxygen by algae during photosynthesis at steady state depends on irradiance according to a classical equation for the activity of enzymes inhibited by high concentrations of substrate. The equation is derived from a kinetic analysis of plausible reactions between photons and plant pigments, and it predicts that the inhibition of o...
Specific rates of photosynthesis at saturating irradiances (PO,J by laboratory populations of Chlorella and Anabaena depend on intracellular phosphorus (Q). A hyperbolic model of the form Popt = PoptR (1 -&/Q) is used to describe this relationship for three measurements of biomass (cell number, cell volume, and chlorophyll a). Chlorophyll a provide...
Thesis--University of Minnesota. Bibliography: leaves 87-90.
Citations
... a B characterizes the photochemical reactions of photosynthesis and is dependent on light history and availability, nutrient availability, and taxonomic composition (Edwards et al., 2015;Platt and Jassby, 1976;Talling, 1957;Welschmeyer and Lorenzen, 1981). P B M is a function of the enzymatic reactions of photosynthesis and is dependent on temperature, nutrient availability, light history, and taxonomic composition (Fahnenstiel et al., 1989;Geider and Osborne, 1992;Harding et al., 1987;Senft, 1978;Talling, 1957). As stratification developed, epilimnetic chlorophyll a concentrations and P:B ratios increased, likely due to warming temperatures and restricted access of benthic mussels to the euphotic zone (Rowe et al., 2015). ...
... The parameters characterising this functional response to resource availability were temperature dependent. Over a broad range of temperatures (15-35°C) both the maximum growth rate (l max ) and the half-saturation constant (K S ) exhibited nonlinear temperature dependence, consistent with Senft et al. (1981). However, within the operational temperature range (OTR), the temperature dependence of both l max and K S was well fit by the exponential Boltzmann-Arrhenius equation. ...
... Changes in environmental drivers, such as temperature or nutrient availability, can alter biodiversity and influence the transformation and fluxes of organic matter and nutrients in these ecosystems. Temperature has strong e ects on growth rates and the physiology of phytoplankton (Eppley, 1972;Karentz and Smayda, 1984;Butterwick et al., 2005) and can also influence protist mean cell size (Atkinson et al., 2003;Forster et al., 2013), nutrient uptake rates (Senft et al., 2008), N metabolism and cell stoichiometry (Lomas and Glibert, 1999;Montagnes and Franklin, 2001;Litchman et al., 2010), and ER (Yvon-Durocher et al., 2012). Such e ects on autotrophic and heterotrophic producers likely a ect consumers directly. ...
... As the Arrhenius equation for the temperature dependence of reaction rates (Megard et al. 1984) indicates that the oxygen production rate can be regarded as a dependent variable of temperature. In addition, the concentration of chlorophyll-a directly reflects the biomass of phytoplankton in the water body and indirectly reflects the nutrient content of the water body (Hoyer et al. 2002;Jiang et al. 2019). ...
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