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Vertical Profiles of Alkaline Phosphatase Activity in Dam Reservoirs and its Relation with Microbial Parameters  

Nakagawa, Ayumi (Faculty of Agriculture, Ehime Univ)
Kagawa, Hisanori (Faculty of Agriculture, Ehime Univ)
Hiroshi, Hirotani (Dept. of Arts and Sciences, Osaka Kyoiku Univ)
Publication Information
Korean Journal of Ecology and Environment / v.37, no.4, 2004 , pp. 406-410 More about this Journal
Abstract
The alkaline phosphatase activity (APA) of two dam reservoirs and inflowing streams were measured monthly in 2000. During summer months in 2001, the vertical profiles of APA and related parameters were also examined in one of the reservoirs. The APA was relatively high during the summer season in the epilimnion while it was almost invariable in the hypolimnion. A small increase in APA was observed at just above the bottom. The APA fluctuation was independent of the concentration of soluble reactive phosphorus. It was assumed that APA is not indicative of the phosphorus availability status. An examination of size-fractionated samples suggested that APA in reservoirs was attached to particles larger than $0.4{\mu}m$, whereas in streams it existed in a dissolved form. There was a positive significant correlation between chlorophyll a concentration and APA in the photic zone. In the aphotic zone, APA correlated positively with the colony count of heterotrophic bacteria, but not with microscopic total bacterial counts.
Keywords
alkaline phosphatase activity; dam reservoir; photic and aphotic zones; chlorophyll a; heterotrophic bacteria;
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