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Other groups in the phytoplankton community resurgence in proportion over time include, Euglenophyceae, the first to quickly attain a relatively high importance in the community - The concentration increased to a maximum of To the contrary, Chlorophyceae increased almost steadily exponentially to attain maximum importance in the community at the end of the experiment 15th day.
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Similarly, maximum importance by Bacillariophyceae was equally observed in the community toward the end of the experiment day Conversely, the dominant index had maximum value of 0. Similarly, the phytoplankton densities oscillated over time. The maximum density occurred at day 1, and then declined to an initial low of x indiv.
On day 13, the biomass values increased sharply Also, an attempt was made to find out the model that would adequately correlate the experimental data that could be used for easy prediction and efficient future studies in the field.
From the above equation the chlorophyll a concentration in the wastewater increases by the factors 6. However, the chlorophyll a concentration might be partly attributed to dominance index, species diversity and abundance.
Part of these processes is in the domain of ecological management and restoration, predominantly on waste management, to restore habitat integrity through sustainable restoration principles and practice procedures. Understanding the intricate progression of the physicochemical and biological processes in a wastes treatment system is imperative to more efficient management processes.
In this respect, this study evaluated biological development in a natural treatment system utilizing solar radiation as energy source.
Thus the less resistant species that were unable to withstand the stress or unfavourable conditions were eliminated Chindah, These species that can be referred as resistant species, could serve as bio- indicators for municipal waste for the eco-region Fogg, Javanmardian and Palsson had reported similar inhibitory effects of some of these blue green algal species at high density from municipal wastewater.
Darley posited that such inhibitory effect may as well be attributed to reduction in photosynthetic efficiency, self shading and accumulation of auto-inhibitors, since transparency is usually affected by the phytoplankton density and nonliving suspended matter.
This contention may result in the reduction of the amount of light impinging and reaching the phytoplankton for photosynthesis Abdel-Aziz et al. The scenario may be responsible for the few species richness observed at the early stages when the blue green algal density was high in the treatment waste water Dorgham et al.
Analogous to this, is the successional pattern observed with the attendant progression in the recruitment of species as the condition of water quality improved especially as nutrient load declined. The sequence of entrants of species into the population by new colonist and or the reemergence of species inadvertently is responsible for the increased species richness and dominance of particular individuals which is similar to the observation reported on nutrient enrich system comparable to wastewater Hillebrand and Sommer,; Vymazal, This circumstances displayed in the emergence of species is an indication of the species preference for a particular water quality to thrive.
It is therefore palpable that the occurrence and ascendancy of Bacillariophyceae and the emergence of other taxonomic groups in the phytoplankton community is adjudged as a clear indication of the recovery status of the water quality Chindah et al. In contrast to the results of similar studies on waste water in Europe -Spain where Chlamydomonassp.
The variability in dominant species in the wastewater type may be associated with the nature and characteristics of the waste water as it appeared that the effluent quality visibly influenced the kind of phytoplankton species.
Some of these phytoplankton species observed in this study have been implicated in organic waste polluted environment Amadi et al. Interestingly, these sequences of events seem to have remarkable effect on the species diversity and dominant index of the phytoplankton species as increase in diversity was observed at the early successional stages but the arrival of new colonist and perhaps competition accounted for the decreased diversity at the later successional stage.
These marked changes observed in this study point to the important role of competitive displacement on temporal species assemblage and occupancy in the wastewater system with adjustment in the physicochemical quality status or as recovery period progresses and to a large extent explains the critical requirement of phytoplankton environment as it tended to improve as equilibrium in the water parameters is achieved.
This is attributed to the reduction of the inhibitory substances which was not determined in this study and improvement of the water quality attributes Vymazal, ; Javanmardian and Palsson, and perhaps the influence or effect of other parameters such as temperature, solar energy and increased oxygen concentration Berna et al.
The critical associations observed between the independent and dependable variables highlight the importance of water quality and environmental gradient on the organization of biological resources and the close relationship between the predicted and actual data implies that these parameters can be relied upon in waste water treatment monitoring as it provide understanding of the possible ecologic effects of anthropogenic activities and ecosystem stability.
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The authors also acknowledge with thanks the constructive, thorough, and valuable comments by eight anonymous reviewers of this manuscript. Pollution Studies on Nigerian Rivers. Water Quality of some Nigerian Rivers. There only appear to be two figures of the saint, and the two scenes are divided by what looks like a short vertical bar indicating a difference of subject. Pros and cons of breast enhancement m bb torliatt yahoo dating photos 11 augustfrench.
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