COMUNIDADE DE ALGAS EPIFÍTICAS (COM ÊNFASE EM DIATOMÁCEAS) EM 23 VEREDAS DO ESTADO DE GOIÁS SOB DIFERENTES IMPACTOS AMBIENTAIS
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2010-05-16
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Universidade Federal de Goiás
Resumo
(Epiphytic algae community of (with emphasis on diatoms) of Palm swamps of Goias State).
The present study is the first to evaluating epiphytic algae community structure of in the
subsystem Palm swamps in the Cerrado. The general hypotheses of this study were: impacted
Palm swamps are under greater influence of allochthonous material, causing changes in
limnological characteristics, as the record of increased nutrient levels and turbidity; the structure
of ephiphytic algae community is influenced by environmental characteristics, and impacted
Palm swamps have diatom as dominant group of epiphyton due to the adaptive cytomorphological
characteristics. The overall objective was to analyze the spatial variation of
limnological (physical, chemical and biological) and climatological characteristics of 23 Palm
swamps in the Goias State under different environmental impacts and to evaluate epiphytic algae
community structure of in relation to environmental characteristics of Palm swamps. This
dissertation was structured in a general introduction and two chapters in the form of articles:
(Article 1) Spatial variation of limnological and climatic characteristics of Palm swamps under
different environmental impacts in the Goias State; (Article 2) Relationship between the
structure epiphytic algal community (with emphasis on diatoms) and Palm swamps under
different environmental impacts in the Goias State. Sampling was conducted in August and
September 2008, in the cities of Caldas Novas, Catalan, Cidade de Goiás, Goiânia, Ipameri,
Morrinhos and Piracanjuba. Environmental data of Palm swamps were analyzed: morphometric,
climatological and limnological characteristics (pH, water temperature, conductivity and
turbidity), nutrients (total nitrogen, total phosphorus and silica), chlorophyll-a and the attributes
of epiphytic algae community structure (composition, richness, density, biovolume, diversity and
evenness). The abiotic data were collected simultaneously to the biotic data. Epiphytic material
was obtained from grasses (Poaceae). Environments showed great variation in the values of
electric conductivity, turbidity, total nitrogen and epiphytic biomass, low pH and total
phosphorus, and high concentrations of silica. Palm swamps groups under different
environmental impacts were discriminated mainly by pH and turbidity. Among the environments
preserved only 50% showed oligotrophic characteristics for total nitrogen content, a situation
caused by contamination by agricultural activities and urban impacts. It was noted that the acidic
water was related to the dystrophic soils of these environments, which showed the pH as an
important variable in structuring communities. Greater richness, diversity, density and
biovolume of epiphytic algae were recorded in Palm swamps impacted. Zignemafíceas were the most representative in species richness followed by diatoms. Palm swamps impacted had greater density and biovolume of epifiton. Eunotia bilunaris (Ehrenberg) Mills was predominant in the
Palm swamps with the highest density of epiphytic algae. Tapinothrix bornetii Sauvageau had
higher biovolume in the community. Two taxa (Gomphonema sp.2 and Oedogonium sp.4) were
indicator species to impacted by agriculture Palm swamps. This study reported great features for
development of several taxa of Bacillariophyceae, manly to Eunotia Ehrenberg. The epiphytic
community of Palm swamps showed less expressive than Veredas impacted, probably related to
characteristics such as low light, given the preservation of vegetation cover of arboreal and low
concentrations of nutrients.
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Citação
OLIVEIRA, Bárbara Dunck. Epiphytic algae community (with emphasis on diatoms) of Palm swamps of Goias State. 2010. 41 f. Dissertação (Mestrado em Ciências Biológicas - Biologia) - Universidade Federal de Goiás, Goiânia, 2010.