Trophic state index validation based on the phytoplankton functional group approach in Amazon floodplain lakes

the effect of functional/notional approach on the proficiency level of efl learners and its evaluation through functional test

in fact, this study focused on the following questions: 1. is there any difference between the effect of functional/notional approach and the structural approaches to language teaching on the proficiency test of efl learners? 2. can a rather innovative language test referred to as "functional test" ge devised so so to measure the proficiency test of efl learners, and thus be as much reliable an...

Viruses and bacteria in floodplain lakes along a major Amazon tributary respond to distance to the Amazon River

In response to the massive volume of water along the Amazon River, the Amazon tributaries have their water backed up by 100s of kilometers upstream their mouth. This backwater effect is part of the complex hydrodynamics of Amazonian surface waters, which in turn drives the variation in concentrations of organic matter and nutrients, and also regulates planktonic communities such as viruses and ...

the trophic state of patagonian argentinean lakes and its relationship with depth distribution in sediment phosphorus

the parameters used to determine the trophic state of a water body are: total phosphorus (tp),transparency (secchi disk depth) and chlorophyll a. however, these parameters show strong seasonalfluctuations which may hinder the estimation of trophic state. some authors have proposed that sediments be used as an additional tool to evaluate the trophic state of a water body. the aim of this study w...

Trophic Cascades in Lakes:

Eternal vigilance on an Amazon floodplain

Deep and puzzling evolutionary questions are still being raised by the unfashionable work of systematic biologists. James S. Albert describes some such work and argues why we need much more of it in the face of unprecedented loss of species through human activity.