MASSES OF PERIPYTIC DIATOMS IN AN INTERMITTENT RIVER IN NORTHWEST CEARENSE
DOI:
https://doi.org/10.56346/ijsa.v7i7.210Keywords:
Bacillariophyta, Chain-forming algaeAbstract
In the Brazilian semi-arid region, aquatic ecosystems are predominantly intermittent, playing a fundamental role in maintaining the biodiversity of this region. Diatoms (phylum Bacillariophyta) are microalgae common in aquatic environments, serving as a crucial foundation for the food web and thereby influencing the dynamics of the entire limnetic community. In a study on local biodiversity and its responses to hydrological dynamics in intermittent streams of the Acaraú River basin, we observed a filamentous mass of periphytic algae that covered almost the entire surface of the substrate in one of the sampling points. The aim of this study was to identify and characterize the occurrence of the mass-forming algae. Samples were collected monthly over five months (May to September 2023) in a permanent stream section (100 m in length) from Mata Seca stream, Sobral-CE. Environmental data were sampled along with manual collection of the algal masses. Dense masses occurred during the flood period, with the average stream depth was 10.2 cm, fast-flowing water (few slow-flow areas), and mainly on sand and gravel substrates. Microscopical observations showed that filamentous masses correspond to diatoms forming long ribbon or zigzag-shaped chains spp. Pleurosira laevis, Eunotia didyma and Eunotia pectinalis. These diatoms were found downstream in the same stream, but in smaller quantities and without mass formation. The occurrence of these species is relevant for distribution and autecology data. Additionally, the high biomasses indicate that upstream parts of the streams are important growth points for these algae, ensuring the possibility of their dispersion throughout the entire watershed.
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