Nutrient and sediment retention in Andean raised-field agriculture

Article Abstract:

Rehabilitation of raised fields for cultivation of crops are beneficial for adequate water supply, resulting in higher yields and the crops are safe from frost. An examination of the quality of water in the channels situated beside rehabilitated raised fields near Tiwanaku in Bolivia along Lake Titicaca, showed high concentrations of nitrate, phosphate and also a reduction in turbidity. The water in these channels retain their nutrients, and the suspended sediments help to reduce water pollution. Thus, the practice of raised field agriculture was found to be advantageous to the environment.

Water, Composition, Water quality, Bolivia

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A highly unsaturated fatty acid predicts carbon transfer between primary producers and consumers

Article Abstract:

The lack of eicosapentaenoic acid (20:5-omega-3) in cyanobacteria could itself be the reason for the poor quality of seston dominated by cyanobacteria. It seems that the lack of 20:5-omega-3 in cyanobacteria is the main reason for the decoupling between primary and secondary production. It was found that zooplankton growth and egg production are strongly connected with the primary producer 20:5-omega-3 to carbon ratio. Limitation of zooplankton production by 20:5-omega-3 is of key significance at the pelagic producer-consumer interface.

Physiological aspects, Arachidonic acid, Zooplankton

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Carbon dioxide limitation of marine phytoplankton growth rates

Article Abstract:

Carbon dioxide (CO2) levels in sea water restrict the growth of diatoms and other marine phytoplankton. Diatoms obtain the dissolved inorganic carbon needed for photosynthesis mainly in the form of CO2. Although scientists had previously thought that the amount of other nutrients such as nitrate served as a check on oceanic primary productivity, new experiments show that CO2 concentrations have this effect as well. Hence atmospheric CO2 levels may change in relation to the ocean's ability to absorb CO2.

Environmental aspects, Growth, Carbon dioxide, Marine phytoplankton

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