Zygnematophyceae (Streptophyta) no perifíton de lagos urbanos do município de Goiânia, Go
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2016-03-24
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Universidade Federal de Goiás
Resumo
Urban ponds comprise habitats with a great diversity biotic and abiotic. This study aimed at
analyzing the community structure of Zygnematophyceae algae in the periphyton of nine urban
eutrophic ponds from Goiânia, GO. Samples were collected in August 2014, in the littoral
zone. Periphyton was collected from two different substrates, macrophyte petiole (epiphyton) and
pebbles (epilithon). Altogether 49 Zygnematophyceae taxa were recorded, distributed in two
orders, five families and 13 genus. The highest chlorophyll a value was reported at Beija-flor Pond
(2.9 μg cm-2), while the smallest one at Jardim Botânico Pond (0.8 μg cm-2).
The epilithon presented a relatively higher mean value (2.4 μg cm-2) when compared
to epiphyton (1.5 μg cm-2), although no statistical difference were reported between the substrates
(W = 51.0; p = 0.148). Among taxonomic classes, Cyanobacteria contributed most
to periphyton density (6.0 × 106 ind cm-2) especially in the epilithon, representing from 70 to
almost 100% in some ponds. The class Bacillariophyceae had the second highest contribution,
followed by Chlorophyceae. Based on frequency of occurrence, most taxa were classified as rare,
being present in less than 20% of the samples. Only Cosmarium tenue and Mougeotia sp. 3 were
classified as common. The average Zynematophyceae density was 6.2 × 103 ind cm-2, representing
0.82% of the periphytic community in the epiphyton and 0.02% in the epilithon. Most taxa reported
here have been cited by literature in eutrophic habitats, and may be used as biological
indicators (e.g., Staurastrum volans, Pleurotaenium trabecula var. trabecula, Closterium acutum
var. variabile. Some ponds with relatively high nutrient values (e.g., Flamboyant pond) also
presented higher diversity, which can be explained by these taxa tolerance to their local
environments.
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SILVA, F. K. L. Zygnematophyceae (Streptophyta) no perifíton de lagos urbanos do município de Goiânia, Go. 2016. 76 f. Dissertação (Mestrado em Biodiversidade Vegetal) - Universidade Federal de Goiás, Goiânia, 2016.