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Botanical Sciences
versión On-line ISSN 2007-4476versión impresa ISSN 2007-4298
Resumen
RODRIGUEZ-FLORES, Rogelio y CARMONA-JIMENEZ, Javier. Ecology and distribution of macroscopic algae communities in streams from the Basin of Mexico. Bot. sci [online]. 2018, vol.96, n.1, pp.63-75. ISSN 2007-4476. https://doi.org/10.17129/botsci.1237.
Background:
Several studies of lotic ecosystems have provided important ecological information on the influence of environmental heterogeneity on macroscopic algae composition.
Hypothesis:
The highest species diversity will occur during the cold-dry season, correlated to low temperature and oligothrophic water, while the distribution of each species will be related to heterogeneity of habitat and its dispersal strategies.
Studied species:
Twenty-two species of macroscopic algae of different Phyla (Chlorophyta, Cyanobacteria, Heterokontophyta and Rhodophyta).
Study site:
The macroscopic algae composition was described for 35 permanent mountain streams in the Basin of Mexico from 2012 to 2015.
Methods:
Algae species, physico-chemical water conditions and microhabitat factors were recorded in situ at each contrasting season. The relationship between diversity and the environmental factors was statistically evaluated by Canonical Correspondence Analysis and a Spearman test.
Results:
Macroscopic algae recorded had biological features and environmental abilities that separated them into two groups. The first included the most frequent and abundant species: Nostoc parmelioides, Placoma regularis, Prasiola mexicana and Vaucheria bursata. The second included species restricted to certain habitats: Draparnaldia mutabilis, Tetraspora gelatinosa, Batrachospermum gelatinosum and Paralemanea mexicana. Each Phyla responds differentially to the spatial heterogeneity of the streams, but the species does not change between contrasting seasons.
Conclusions:
Local and spatial environmental variables explain differences in richness and distribution of species on the studied area; however, species composition does not vary widely among sampling sites. Cyanobacteria and Chlorophyta are more affected by local environmental variables, whereas Rhodophyta is more influenced by spatial variables.
Palabras llave : Aquatic communities; Basin of Mexico; macroscopic algae; mountain streams.