Effects of Solar Radiation on the Dynamics of Dissolved Oxygen in Channel Catfish Ponds

Abstract

The daytime increase in dissolved oxygen (DO) concentration of pond waters may be estimated from solar radiation, chlorophyll a concentration, and percentage O2 saturation at dawn (coefficient of multiple determination, R2 = 0.83), or from solar radiation, Secchi disk visibility, and percentage O2 saturation at dawn (R2 = 0.80). A computer simulation model for predicting the effects of cloudy weather (low solar radiation) on DO depletion was developed for channel catfish ponds. The model incorporates the equation for estimating daytime DO increase from solar radiation and Secchi disk visibility with components for estimating the nighttime decline in DO from respiration by the plankton, fish, and benthic communities, and the gains or losses from diffusion. Results from the study demonstrated that the combination of dense plankton blooms and low levels of light intensity were closely related to low concentrations of DO.

Gas transfer velocities of methane and carbon dioxide in a subtropical shallow pond

“…In our study, DO in the surface water was closely related to the respiration of plankton algae. Cloudy weather profoundly influenced DO concentrations in ponds (Romaire and Boyd, 1979). On clear days, there is sufficient light for high rates of photosynthesis, and DO concentrations normally are high.…”

Photosynthesis and community respiration at three depths during a period of stable phytoplankton stock in a eutrophic brackish water culture pond

“…According to the empirical model presented by Romaire & Boyd (1979), had this Secchi depth been attained in a pond of 1 m depth, diel minimum DO should readily have fallen below 622. pm01 l-l (2.0 mg I-'), and should have reached zero during the 2 periods of low irradiance, yet neither of these conditions was realized. Die1 minima (1) never reached zero; (2) were below 31.2 pm01 1-' (1.0 mg 1-l) on only 2 of 14 dates (including the second day of low light but not the first); (3) were otherwise always greater than 62.5 pm01 I-' (2.0 mg I-'); and (4) exceeded 100 pm01 1-' on the dates following the lowest excursions.…”

“…The crash phenomenon has been described repeatedly, but wlthout consistent interpretation (Abeliovich 1967, Barica 1975, Seymour 1980, Motzkin et al 1982, Boyd 1990, Erez et al 1990). Modeling and experimentation specific to pond communities have elucidated factors in production (Murphy 1962, Romaire & Boyd 1979, Laws & Malecha 1981, Grobbelaar 1989, but have less frequently addressed the question of stability directly (Krom et al 1989, Piedrahita 1990, 1991, Szyper et al 1991.…”

Effect of prolonged summer on two ox-bow lakes

“…Sometimes atypical seasonal conditions can largely alter the primary productivity of phytoplankton. For example, cloudy days cause a substantial decrease in photosynthetic activity of phytoplankton (Romaire & Boyd 1979;Kwang-Seuk et al 2003). Behrenfeld et al (2002) observed a clear relation between primary production and photoacclimation in oceanic algae.…”