Explaining diversity patterns in dark waters – a study of aquatic caves in Yucatán, Mexico

2019 ◽  
Vol 35 (5) ◽  
pp. 237-246
Author(s):  
Barbara Hendus ◽  
Róger Medina-González ◽  
Celia Sélem-Salas ◽  
Bram Vanschoenwinkel
Keyword(s):  
Water Quality ◽  
Aquatic Biota ◽  
Benthic Species ◽  
Diversity Patterns ◽  
Functional Guild ◽  
Nitrate Concentrations ◽  
Guild Composition ◽  
Potential Link ◽  
The Tropics ◽  
Invertebrate Biomass

AbstractIn the tropics, limestone caves in karstic areas are known for their unique biodiversity. However, many caves remain unstudied and little is known about underlying gradients that determine diversity and biomass in aquatic microhabitats. Here, we sampled zooplankton and benthos in a set of 12 aquatic caves, locally called closed cenotes in Yucatán, Mexico. Our aim was to explain diversity patterns and differences in biomass with particular attention for correlations between bat colony characteristics and other biota. Compared with caves that support photosynthesis, diversity was low with an average of four planktonic and two benthic species in these dark caves. Undetectable phosphorus concentrations in the water suggest this nutrient is limiting. Several associations hint at a potential link between bat abundance and functional guild composition, water quality and aquatic biota. As such, more bats were linked to higher nitrate concentrations. Yet this was not translated to higher invertebrate biomass, probably since phosphorus is limiting. Overall, the trends found in this survey suggest that bats could be important as fertilizers of the caves although mechanistic links that mediate the flux of nutrients need to be confirmed experimentally.

Characteristics of physical water quality variation under heat storage in closed saline water aquaculture ponds in the tropics

2021 ◽  
Author(s):  
Akinori Ozaki ◽  
Panitan Kaewjantawee ◽  
Nguyen Van Thinh ◽  
Masaru Matsumoto ◽  
Masayoshi Harada ◽  
...  
Keyword(s):  
Water Quality ◽  
Heat Storage ◽  
Saline Water ◽  
Aquaculture Ponds ◽  
Water Quality Variation ◽  
The Tropics ◽  
Quality Variation

scholarly journals Substrate Specific Zooperiphyton And Their Relationships With Water Quality Parameters In Dhanmondi Lake Dhaka, Bangladesh

2014 ◽  
Vol 40 (2) ◽  
pp. 283-294
Author(s):  
Md Eilious Hosain ◽  
M Niamul Naser
Keyword(s):  
Water Quality ◽  
Significant Role ◽  
Quality Parameters ◽  
Aquatic System ◽  
Water Quality Parameters ◽  
Aquatic Biota ◽  
Dominant Group ◽  
Aesthetic Value ◽  
Physicochemical Features

In the present investigation, zooperiphyton communities comprised protozoa, rotifera copepoda, cladocera, ostracoda, conchostraca, insect’s larvae, oligochaeta, nematoda and mollusca. The group of zooperiphyton on three substrates showed no significant differences (P>0.05). Rotifers and protozoans were the most dominant group of total zooperiphyton abundance among three substrates. The interrelationships between zooperiphyton groups and physicochemical features of water as well as among different groups of zooperiphyton revealed that abundance and growth of zooperiphyton on substrates are influenced by water quality parameters and each with others. The ranges of physicochemical features of water of Dhanmondi lake were suitable for zooperiphyton communities including aquatic biota and also play a significant role to settle zooperiphyton on three substrates. That can help in enhancing productivity of the lake as well as sustaining aesthetic value of aquatic system. Asiat. Soc. Bangladesh, Sci. 40(2): 283-294, December 2014

scholarly journals Modelling of nitrogen concentrations in water from drained peat soils

2019 ◽  
Vol 69 (3) ◽  
pp. 288-297 ◽  
Author(s):  
Anatoli Vassiljev ◽  
Ivar Annus ◽  
Nils Kändler ◽  
Katrin Kaur
Keyword(s):  
Water Quality ◽  
Significant Source ◽  
Agricultural Activity ◽  
Large Share ◽  
Peat Soils ◽  
Nitrate Concentrations ◽  
Nitrogen Concentrations ◽  
Improve Water Quality ◽  
Model Water

Abstract In addition to traditional sources, drained peat soils have been found to be a significant source of nitrogen in Estonia. As a result, supplementary measures are required to improve water quality in rivers. Modelling is a widespread method to select means for improving water quality. At present, modelling of nitrogen in rivers has been concentrated on the influence of agricultural activity. However, drained peat can increase nitrogen concentrations even without fertilization and farming activities. This investigation describes the attempt to model water quality in the watershed with a large share of drained peat soils. The results showed a good alignment between measured and modelled nitrate concentrations using the MACRO and the SOILN for MACRO models. Some measures to improve water quality were tested using these models.

scholarly journals Modelling of the Effect of Drained Peat Soils to Water Quality Using MACRO and SOILN Models

Proceedings ◽  
2018 ◽  
Vol 2 (11) ◽  
pp. 619 ◽  
Author(s):  
Anatoli Vassiljev ◽  
Ivar Annus ◽  
Nils Kändler ◽  
Katrin Kaur
Keyword(s):  
Water Quality ◽  
Significant Source ◽  
Agricultural Activity ◽  
Large Share ◽  
Peat Soils ◽  
Nitrate Concentrations ◽  
Nitrogen Concentrations ◽  
Improve Water Quality ◽  
Model Water

Investigations have indicated that in addition to traditional sources, drained peat soils can be considered as a significant source of nitrogen in Estonia. This changes the measures to improve water quality in rivers. At present modelling of nitrogen in rivers has been concentrated on influence of agricultural activity. However, drained peat can increase nitrogen concentrations even without fertilization and farming activities. This investigation describes the attempt to model water quality in the watershed with large share of drained peat soils. A good alignment between measured and modelled nitrate concentrations using the MACRO and the SOILN for MACRO models was shown.

scholarly journals Drinking water quality in schools of the Santarém region, Amazon, Brazil, and health implications for school children

2018 ◽  
Vol 13 (6) ◽  
pp. 1 ◽  
Author(s):  
Marina Smidt Celere Meschede ◽  
Bernardino Ribeiro Figueiredo ◽  
Renato Igor da silva Alves ◽  
Susana Inés Segura-Muñoz
Keyword(s):  
Water Quality ◽  
Drinking Water ◽  
Health Risk ◽  
School Children ◽  
Water Samples ◽  
Local Governments ◽  
Drinking Water Quality ◽  
Aluminium Content ◽  
Health Implications ◽  
Nitrate Concentrations

The quality of drinking water and its health implications for school children were examined at schools in the Santarém region, Amazon, Brazil. In this region, the population is fully supplied by groundwater from the voluminous Alter do Chão aquifer. Drinking water samples from three schools in Santarem city and from one school at the rural Mojuí dos Campos town were subjected to microbiological and physicochemical compositional analyses. The health risk of human exposure to chemical compounds through water intake was also evaluated. The results indicated that most water samples were contaminated with total coliform and with E. coli, which could cause serious intestinal disorders for school children. Drinking water was acidic and most of the chemical element concentrations were within Brazilian water potability recommended levels. One exception was the high aluminium content in schools from Santarem served by shallower wells, suggesting that further epidemiological studies are necessary and the monitoring of exposed school children should not be discarded. Elevated nitrate concentrations were also noted in schools from Santarém with shallower wells, indicating lack of sanitation and the importance of periodic monitoring of drinking water to prevent adverse health effects. Quantification of human health risk indicated a hazard in schools served by shallower wells, with aluminium as the main pollutant, followed by nitrate. The results showed that most drinking water quality parameters are in accordance with Brazilian legislation. However, microbiological contamination, water acidity, aluminium and nitrate concentrations must be taken into consideration for local governments in order to prevent related diseases among school children.

Diversity Patterns in the Tropics

2012 ◽  
pp. 238-250 ◽  
Author(s):  
Louis Deharveng ◽  
Anne Bedos
Keyword(s):  
Diversity Patterns ◽  
The Tropics
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