Chironomid Fauna of the Lakes from the Pechora River Basin (Bolshezemelskaia Tundra, Northern Russia): Ecology and Reconstruction of Recent Ecological Changes in the Region

2017 ◽  
Keyword(s):  
River Basin ◽  
Ecological Changes ◽  
Pechora River ◽  
Northern Russia ◽  
Pechora River Basin ◽  
Chironomid Fauna

scholarly journals CHANGES IN THE CHEMICAL DENUDATION INTENSITY IN THE RIVER PECHORA CATCHMENT UNDER THE INFLUENCE OF NON-STATIONARY CLIMATE AND ECONOMIC ACTIVITIES

2020 ◽  
Vol 25 (4) ◽  
pp. 38-49
Author(s):  
A. O. Danilenko ◽  
◽  
O. S. Reshetnyak ◽  
L. S. Kosmenko ◽  
M. Yu. Kondakova ◽  
...  
Keyword(s):  
River Basin ◽  
Climate Warming ◽  
The Arctic ◽  
Anthropogenic Factors ◽  
Salt Composition ◽  
Economic Activities ◽  
Pechora River ◽  
Nonstationary Climate ◽  
Pechora River Basin

Introduction. Climate warming, which is currently observed in the Arctic, has the potential to intensify chemical denudation in river basins partially or completely located within permafrost. In order to test this hypothesis, we investigated the longterm dynamics of the rivers’ ion runoff in the Pechora River basin, 42 % of which are located within permafrost. Methods. To study changes in the chemical denudation intensity in nonstationary climate, we analyzed data of systematic observations over the main ion concentrations from 1985 to 2017 in the Pechora River outlet (Naryan-Mar) and its tributaries (Usa, Adzva, Kolva, Sula rivers). The intensity of chemical denudation in the Pechora River basin was assessed in terms of ion runoff. The probable reasons for its changes — water content and concentrations of macrocomponents — were also analyzed. Results. The ion-salt composition of Pechora River water is mainly determined by the dissolution of carbonate minerals in the underlying rocks. Calculations and comparison of ion runoff moduli showed that the studied rivers are comparable in terms of the chemical denudation intensity in catchments. The exceptions were the Sula and Kolva rivers, where, with the river runoff, a relatively high amount of chlorides and hydrocarbonates is carried. Contrary to the initial assumptions about the possible intensification of the chemical denudation process under the conditions of climate warming, we found a decrease in the sulfate runoff moduli in all rivers. In addition to that, individual changes in the runoff moduli for other main ions are observed for the studied rivers. Conclusion. In modern conditions, the chemical denudation intensity remains at the level of the end of the last century, and the long-term dynamics of the Pechora River ion runoff correlates in time with the variability of anthropogenic factors, in particular, wet sulfate deposition with atmospheric waters.

scholarly journals First record of Lopescladius Oliveira, 1967 (Chironomidae: Orthocladiinae) in the Piranhas-Açu River basin, Brazil, with ecological notes on its habitat use

Check List ◽  
2015 ◽  
Vol 11 (1) ◽  
pp. 1554
Author(s):  
Rafaela Lima de Farias ◽  
Thuanny Fernanda Braga Alencar ◽  
Elvio S.F. Medeiros
Keyword(s):  
Habitat Use ◽  
River Basin ◽  
Rio Grande ◽  
First Record ◽  
The State ◽  
Northeastern Brazil ◽  
Future Research ◽  
Intermittent Stream ◽  
Ecological Aspects ◽  
Chironomid Fauna

The present study describes a new site of occurrence for the genus Lopescladius in Brazil and reports the first record for the Piranhas-Açu River basin, in the state of Rio Grande do Norte, northeastern Brazil. This new occurrence expands the distribution of the genus and adds to the knowledge of the chironomid fauna. The presence of this genus in an intermittent stream highlights the importance of future research on this type of aquatic system as well as ecological aspects related to Lopescladius.

Schistosomiasis in the Senegal River Basin: before and after the construction of the dams at Diama, Senegal and Manantali, Mali and future prospects

1997 ◽  
Vol 71 (2) ◽  
pp. 125-132 ◽  
Author(s):  
V.R. Southgate
Keyword(s):  
River Basin ◽  
Human Population ◽  
Sea Water ◽  
Intermediate Hosts ◽  
Senegal River ◽  
Human Schistosomiasis ◽  
Ecological Changes ◽  
Before And After ◽  
Senegal River Basin ◽  
New Habitats

AbstractEcological changes in the Senegal River Basin (SRB) resulting from the construction of a barrage at Diama, Senegal on the Senegal River to prevent the intrusion of sea water into the river, and a dam at Manantali, Mali on the Bafing River to control the flow of water and to generate electricity, have been responsible for changes in the epidemiology of human schistosomiasis. The introduction of Schistosoma mansoni into the Lower and Middle Valleys of the SRB and subsequent spread of the parasite in the human population is recorded with regard to prevalence and intensity. New foci of S. haematobium are described. The reduction in salinity and change from an acidic to an alkaline environment in the water are beneficial to both the fecundity and growth of freshwater snails and transmission of the parasite. The creation of new irrigation canals and expansion of the rice fields have provided new habitats for intermediate hosts to colonize. The evidence for praziquantel resistance/tolerance by populations of S. mansoni and the possibilities of the development, production and testing of a vaccine against human schistosomiasis are discussed. Future studies will monitor the spread of human urinary and mesenteric schistosomiasis in the SRB, will evaluate further the presence of praziquantel resistance/tolerance in S. mansoni, will examine the heavily infected human population for pathological symptoms and determine the most appropriate methods to control this severe outbreak of human schistosomiasis.

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