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Effi ciency of phosphorus accumulation by plankton,periphyton developed on submerged artifi cial substrata and metaphyton:in-situ observation in two shallow ponds

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Journal of Oceanology and Limnology 2021年第3期39卷 928-945页

作者： Marija PEĆIĆ Slađana POPOVIĆ Vesna MILUTINOVIĆ Gordana SUBAKOV SIMIĆ Ivana TRBOJEVIĆ Dragana PREDOJEVIĆ Institute of Botany and Botanical Garden‘Jevremovac’ Faculty of BiologyUniversity of BelgradeBelgrade 11000Serbia Institute of Chemistry Technology and MetallurgyScientific InstitutionNational InstituteCenter for Ecology and TechnoeconomicsUniversity of BelgradeBelgrade 11000Serbia Institute of Public Health of Belgrade Belgrade 11000Serbia

Phosphorus overenrichment of shallow ponds prevailing in wetlands leads to their eutrophication causing the collapse of those vulnerable *** potential of phosphorus accumulation by periphyton developed on artificial substrata has been investigated in two shallow ponds(Bara?ka and?iroki Rit)in northwest Serbia and compared to the same ability of plankton and *** periphyton substrate carrier has been submerged from May to *** continuously(CS)and monthly developed(MS)periphyton were *** component of all investigated communities has been qualitatively *** accumulation of only 14.7 mg TP/m^(2) was recorded in three-month exposed periphyton *** exposed from July to August reached maximal 12.7 mg TP/m^(2).Plankton community that was characterized by more diverse and abundantly developed algal component was more effective in phosphorus accumulation(0.7 mg/g dry weight)in comparison with dominantly inorganic and diatom-dominated periphyton in Bara?*** conditions caused by recent revitalization(dredging organic matter and mud from pond basin—redigging)as well as rapid desiccation of?iroki Rit disabled making an unambiguous conclusion about the efficiency of phosphorus accumulation among different communities,but suggested slight potential of phosphorus harvesting by metaphyton in this *** to the shorter exposure time that brings the reduced risk of unpredictable changes in the ecosystem,as well as the considerable amount of accumulated phosphorus,large-scale application of one-month exposed periphyton developed on artificial substrates would be more advisable for phosphorus harvesting in nutrient affected shallow ponds.

关键词： periphyton phosphorus accumulation shallow ponds (phyto)plankton metaphyton eutrophication

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Seasonal Partitioning of Primary Production and Biomass between Phytoplankton and metaphyton in a Shallow Lake Agmon, Hula Valley (Israel)

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Open Journal of Modern Hydrology 2018年第2期8卷 66-81页

作者： Y. Yehoshua M. Gophen The Mina and Everard Goodman Faculty of Life Sciences Bar-Ilan University Ramat-Gan Israel MIGAL Scientific Research Institute Kiryat Shmona Israel

Agmon is a small, shallow man-made lake (area: 1.1 km2;mean depth 0.45 m), excavated in the peat soils of the Hula Valley in northern Israel, that was filled with water in August 1994. We followed the seasonal variations in phytoplankton and metaphyton biomass, primary production and related environmental conditions between December 1995 and July 1997. Water temperature ranged between 9.5°C - 30.8°C;pH ranged between 7.2 - 8.6. The algae in Lake Agmon were characterized by seasonal alterations between summer-fall phytoplankton blooms and spring proliferation of benthic algal mats, with a winter clear-water phase. Chlorophyll a content in the water, as a measure of planktonic algal biomass, was low in winter (1.75 - 5 μg·L-1) and high in summer (>100 μg·L-1), when planktonic cyanobacteria (Microcystis spp.) bloomed. metaphyton biomass varied between 3.5 and 970 g·dry·wt·m-2, with chlorophyll a content ranging from 5 - 701 mg·m-2. The dominant benthic algal genera were Spirogyra and Oedogonium in 1996 and Cladophora in 1997. Phytoplankton primary production was high in summer-fall, with a maximum of 1200 mg·O2·m-2·h-1. Benthic primary production was high from March till May, with a peak of 2173 mg·O2·m-2·h-1 in April 1997. The rate of benthic algal primary production was positively correlated to benthic chlorophyll a (r2 = 0.90). Diel measurements of water column dissolved oxygen (DO) concentration, conducted monthly from January to May 1997, revealed that DO concentration ranged from a nighttime minimum of 5.3 to a noon peak of 15.3 mg·L-1. Only during January to February, no significant changes in DO with depth were found, suggesting that at that time the water column was well mixed. The most salient feature of primary production in the lake was the seasonal partitioning between its benthic and planktonic components. This was most evident in the significant inverse relationship between benthic and planktonic primary productivity rates (r2 = 0.78).

关键词： Chlorophyll a Agmon metaphyton Phytoplankton Primary Production

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