Erworbene symptomatische Endokardfibrosen bei Erwaehsenen

Uehlinger, A; Brunner, Hanspeter; Schaub, F; Uehlinger, E

doi:10.1159/000167398

Cited by 1 publication

(1 citation statement)

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“…The phytoplankton density was estimated according to Utermöhl (1958) using an inverted Zeiss Oberkochen microscope (model Axiovert 10), at Â400 magnification, with the sedimented volume defined according to the algae concentration. The individuals (cells, colonies, coenobia, and filaments) were enumerated in random fields (Uehlinger, 1964), in a sufficient number to stabilize the number of species added per field (minimum-area method), to provide a minimum qualitative representation of the species. Identification of taxonomic groups of algae was based on Bicudo and Menezes (2006).…”

Section: Study Areamentioning

confidence: 99%

Impacts of small dams on the phytoplankton and invertebrates in an Amazonian river

Arcifa

Coelho

Silva

et al. 2023

River Research & Apps

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The construction of small hydroelectric plants (SHPs) has increased greatly worldwide, and the impacts of these impoundments can cause changes in the aquatic biota. Here, we investigated the ecological attributes (abundance, richness, and species diversity) of three communities (phytoplankton, invertebrates in the water column, and benthos) and the functional groups of phytoplankton, before and after the construction of five SHPs in an Amazonian river. The communities were sampled at two sites, one upstream and another downstream of each dam or construction site, before the dam closure. The dam did not change the limnological factors, and the acid waters and low electrical conductivity, typical of “cerrado” rivers, were characteristic of both the pre‐ and post‐dam phases. For aquatic communities, the phytoplankton abundance increased and the diversity of groups decreased in the post‐dam phase. Regarding the morphology‐based functional groups (MBFG), there was an increase in groups I (small algae with a high surface/volume ratio) and V (phytoflagellates), with a reduction in groups VI (diatoms) and VII (large mucilaginous colonies) in the post‐dam phase. The relative abundance of zooplankton species increased in the post‐dam phase, and the opposite was observed for the benthic community, with reductions in abundance, richness, and group diversity in the post‐dam phase. The structure of the three communities differed between the pre‐ and post‐dam phases, but no difference in communities' similarity was observed between the upstream and downstream sites in both phases. The results show that the change in hydrodynamics, from lotic to semi‐lentic, in the reservoirs of the SHPs, was the main driving force for the alterations in the three communities. For phytoplankton, SHPs are favorable in the sense of decreasing the incidence of algal blooms, particularly of cyanobacteria.

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Section: Study Areamentioning

confidence: 99%