Effect of Fish on Water Quality and Nutrients Cycle from an Outdoor Pond Experiment.

Fukushima, Takehiko; Matsushige, Kazuo; Aizaki, Morihiro; Park, Je-Chul; Goma, R. H.; Kong, Dong-Soo

doi:10.2965/jswe.18.883

Cited by 9 publications

(3 citation statements)

References 18 publications

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“…The experiment was conducted in three artificial outdoor ponds (mesocosms) located near Lake Kasumigaura, 60 km northeast of Tokyo, Japan (Fukushima et al 1995a;Park et al 1997). The concrete ponds were lined with nylon sheeting, containing 36 m 3 of water each (regular hexagonal shapes of 3 m on a side; water depth controlled at 1.55 m), and were filled continuously with sand-filtered water from Lake Kasumigaura at a dilution rate of 0.05 day Ϫ1 for more than one year (Table 1).…”

Section: Experimental Systemsmentioning

confidence: 99%

“…The phytoplanktonic carbon concentration was estimated by multiplying the chlorophyll a concentration by the carbon : chlorophyll a ratios (49 mg POC·mg Ϫ1 chlorophyll a for the green algae-dominated pond 1 and 43 mg POC·mg Ϫ1 chlorophyll a for the cyanobacteria-dominated ponds 2 and 3) (Fukushima et al 1995a). The carbon concentration of zooplankton was estimated as the sum of the products of the numbers of each zooplankton species multiplied by species-specific mean volumes (T. Hanazato, Suwa Hydrobiological Station, Shinshu University, Japan, personal communication) and volumetric carbon contents (mean of several samples 0.464 g C cm Ϫ3 ).…”

Section: Measurement Systemsmentioning

confidence: 99%

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Characteristics of nighttime respiration in outdoor mesocosms

2000

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To better understand the patterns and regulation of nighttime community respiration, dissolved oxygen (DO) and pH were simultaneously measured at 5-min intervals for 37 days in each of three outdoor mesocosms with different fish stocking levels. Nighttime decreases in community respiration rates were estimated fairly well by an exponential function of time and slightly worse by a linear one, irrespective of ecosystem differences, but smaller time coefficients were obtained for dissolved inorganic carbon (DIC) than for DO. Respiratory quotients increased significantly from nightfall to the hour before dawn. To roughly estimate gross productivity from net productivity measurements, we extrapolated nighttime respiration from various parts of the night to the daytime; among the models evaluated, that extrapolating the respiration rate averaged over the whole nighttime to the previous day led to the highest correlation between irradiance and estimated gross productivity. Significant correlations were found between estimated daytime gross production rates and respiration rates just after sunset, whereas respiration before sunrise seemed quite constant and close to minimum metabolic rates of the ecosystems. Nighttime respiration was also affected by the composition and/or metabolic state of the system, expressed here by daily net community productivity. Multiple regression analysis showed that more than 75% of daily and between-pond variation in respiration rates just after sunset was explained by daytime gross productivity, planktonic and detrital carbon concentrations, and daily net community productivity. T. Fukushima ( )

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Section: Experimental Systemsmentioning

confidence: 99%

Section: Measurement Systemsmentioning

confidence: 99%

Characteristics of nighttime respiration in outdoor mesocosms

2000

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“…The subjects of the studies are political aspects of the environmental problems (in line with Baumol, et al [5] , Oka [44]), altering the relation between the load of pollutants which lead the deteriora tion of the water quality and economic activities in the catchment area (Ebise, et al [8], [9], Kawamura [28], Fukushima, et al [13], Tabuchi, et al [58], Maeda [34], Wada [69]), the process of pollutant flow along the rivers or in the lake (Ebise [8], [9], Ebise, et al [10], Ministry of Construction [26], Kunimatsu, et al [31], Somiya [51], Tachibana, et al [59], Tabuchi, et al [58]), altering water quality (Somiya [50]), better water purification technology (Inamori, et al. [21], [22], [23], [24], Omori [45], Kanazawa [25], Nishigishi [43]), or problems in the introduc tion of new technologies for water purification (Omori [45], Kobayashi [30], Editroom [3], Nishigishi [43] ).…”

Section: Introductionmentioning

confidence: 99%