Alteração do estado trófico durante um evento de seca prolongada e seus impactos na biomassa algal de um manancial tropical da região semiárida
The main consequence of eutrophication is an increase in algal biomass, mainly cyanobacterial blooms. The high evaporation and low precipitation, characteristics of semiarid regions, contribute to the nutrients availability increase in drought periods and consequent aggravation of eutrophic condi...
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| Formato: | Dissertação |
| Idioma: | por |
| Publicado em: |
Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/21182 |
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| Resumo: | The main consequence of eutrophication is an increase in algal biomass, mainly
cyanobacterial blooms. The high evaporation and low precipitation, characteristics of
semiarid regions, contribute to the nutrients availability increase in drought periods and
consequent aggravation of eutrophic condition in reservoirs. Climate changes tend to
intensify eutrophication symptoms, mostly in a semiarid region. Therefore, the aim of
this study was to evaluate the impact of an extended drought in algal biomass in
Parelhas’s Boqueirão, a mesotrophic reservoir located in a semiarid tropical region. The
low volume was associated to water quality degradation and to the high nutrients
concentrations and low water transparency. The increase in nutrients availability in the
water column, consequence of reduced precipitation and low reservoir’s volume,
provided the necessary resources for algal growth and allowed a change in trophic state
in Boqueirão reservoir. This study showed how an extended drought decreases water
quality. The effect of drought in Boqueirão was late detected due to the reservoir´s low
initial nutrients concentration. The reservoir´s volume reduction increased the nutrient
availability along with the algal biomass increase and the reservoir´s trophic state
change of mesotrophic to eutrophic. |
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