Periphyton is a complex assemblage of micro- and meiofauna embedded in the organic matrix that coats most submerged substrate in the littoral of lakes. The aim of this study was to better understand the consequences of depth-level fluctuation on a periphytic community. The effects of light and wave disturbance on the development of littoral periphyton were evaluated in Lake Erken (Sweden) using...

We estimated the mass budget for mercury (Hg) seasonally deposited into the Florida Everglades and investigated seasonality of Hg cycling by analyzing data obtained for water, soil, flocculent detrital material (floc), periphyton, and mosquitofish collected throughout the Everglades freshwater marshes in the 2005 dry and wet seasons. Higher wet season total Hg (THg) in soil, floc, and periphyto...

Measurements of photosynthetic pigments have been used to estimate the biomass of benthic microalgae on soft and hard substrates in a small river in the Virginia Piedmont. The irregular distribution of periphyton was partially related to substrate distribution and is explained as a result of spatial variations in the current regime in the river. High flow due to unpredictable and heavy rainfall...

Aquatic ecosystems are exposed to multiple stressors such as agricultural run-off (ARO) and climate-change related increase of temperature. We aimed determine how ARO the frequency its input can affect shallow lake through direct indirect effects on primary producers consumers, whether warming mitigate or reinforce impact ARO. performed a set microcosm experiments simulating using cocktail thre...

The material was collected during the open water period from March to end of November 2019. In our research in basin Chirchik river (Boshkizylsay river, Ugam (pre-settlement site), river) were discovered several types zoobenthos and periphyton. monitoring carried out on 8 stations, total 64 quantitative samples macrozoobenthos periphyton taken. Anthropogenic pollution causes changes composition...

St. Kevin Gulch, a headwater stream of the Rocky Mountains of Colorado, receives acid mine drainage that maintains low pH, high concentrations of heavy metals, and high rates of metal hydroxide deposition. An acidtolerant alga, Ulothrix sp., is present below the source of mine drainage in St. Kevin Gulch, but its biomass is limited by the deposition rates of iron hydroxides, which are especiall...

Because of the historical focus limnology on pelagic processes, factors controlling lake periphyton growth and nutrient limitation are understudied compared to phytoplankton. We deployed nutrient-diffusing substrata at 28 sites spanning a wide trophic status gradient in Lakes Superior Michigan assess biomass accrual control response single combined phosphorus (P) nitrogen (N) additions. Periphy...

We developed mathematical models that simulate community dynamics derived from a series of perturbation 13 experiments. These experiments were performed in an Atlantic Forest stream. The three trophic level community 14 was submitted to two combinations of press perturbation experiment. In the first, the top trophic level was 15 removed by electrical exclusion. In the second configuration, the ...

we studied the role of nutrients on various aspects of the periphyton community in artificialstreams. dry mass, ash-free dry mass, chlorophyll a and biovolume of the periphyton community weremeasured under 3 different nutrient regimes, including one from natural streams as a control and twowhich were enriched with n and n+p. results of this experiment indicate that the standing crop of theperip...

Alternative stable states in shallow lakes are typically characterized by submerged macrophyte (clear-water state) or phytoplankton (turbid state) dominance. However, a clear-water state may occur in eutrophic lakes even when macrophytes are absent. To test whether sediment algae could cause a regime shift in the absence of macrophytes, we developed a model of benthic (periphyton) and planktoni...