Biodegradation of microcystins by microbiota of duckweed Spirodelapolyrhiza.

Cyanobacteria-produced allelochemicals, including hepatotoxic microcystins (MCs), exert an inhibitory effect on macrophyte growth. However, the role of macrophyte-associated bacteria and algae (macrophyte microbiota) in mitigating these immediate negative effects of cyanotoxins remains poorly understood. In this paper, we analyzed the biodegradation of microcystin-RR, MC-LR, and MC-LF by microbiota of the macrophyte Spirodela polyrhiza.

Degradation of Three Microcystin Variants in the Presence of the Macrophyte and the Associated Microbial Communities.

Cyanobacteria, which form water blooms all over the world, can produce a wide range of cyanotoxins such as hepatotoxic microcystins (MCs) and other biologically active metabolites harmful to living organisms, including humans. Microcystin biodegradation, particularly caused by bacteria, has been broadly documented; however, studies in this field focus mainly on strains isolated from natural aquatic environments. In this paper, the biodegradation of microcystin-RR (MC-RR), microcystin-LR (MC-LR), and microcystin-LF (MC-LF) after incubation with and the associated microorganisms (which were cultured under laboratory conditions) is shown.

Long-term responses of epiphytic midges (Diptera, Chironomidae) to emergent macrophytes removal and P concentrations in a shallow hypertrophic lake ecosystem.

Chironomid larvae are used as indicators of environmental changes in neolimnological and paleolimnological research. In the present study, we evaluated the responses of epiphytic chironomids to changes in environmental conditions over a long time scale. We intended to decipher whether changes in the trophic status of a lake (hypertrophic-eutrophic) would affect the taxonomic structure of epiphytic chironomids by influencing their food availability (structure of periphytic algae) and whether the responses of chironomids are taxa specific.

Environmental implications of potamophases duration and concentration period in the floodplain lakes of the Bug River valley.

The Bug River, in the section between Dorohusk and Włodawa (part of the eastern UE border), is one of the last remaining natural rivers in Europe. Thus, its abundance of floodplain lakes (FPL) in that part constitutes an area which preserves biodiversity. This study presents an analysis of potamophases duration and the Potamophases Concentration Index (PCI) in 20 floodplain lakes in the multi-year period 1952-2014.

The Effects of Cyanobacterial Bloom Extracts on the Biomass, Chl-a, MC and Other Oligopeptides Contents in a Natural Population.

Blooms of the cyanobacterium are common in shallow, eutrophic freshwaters. may produce hepatotoxic microcystins (MCs) and many other bioactive secondary metabolites belonging mostly to non-ribosomal oligopeptides. The aim of this work was to study the effects of two extracts (Pa-A and Pa-B) of -predominated bloom samples with different oligopeptide profiles and high concentration of biogenic compounds on another natural population.