Ecology and distribution of macroscopic algae communities in streams from the Basin of Mexico

Author:

Rodríguez-Flores Rogelio,Carmona-Jiménez Javier

Abstract

<p><strong>Background</strong><strong>:</strong> Several studies of lotic ecosystems have provided important ecological information on the influence of environmental heterogeneity on macroscopic algae composition.</p><p><strong>Hypothesis</strong><strong>:</strong> 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.</p><p><strong>Studied species</strong><strong>:</strong> Twenty-two species of macroscopic algae of different Phyla (Chlorophyta, Cyanobacteria, Heterokontophyta and Rhodophyta).</p><p><strong>Study site</strong><strong>:</strong> The macroscopic algae composition was described for 35 permanent mountain streams in the Basin of Mexico from 2012 to 2015.</p><p><strong>Methods</strong><strong>:</strong> Algae species, physico-chemical water conditions and microhabitat factors were recorded <em>in situ</em> at each contrasting season. The relationship between diversity and the environmental factors was statistically evaluated by Canonical Correspondence Analysis and a Spearman test. </p><p><strong>Results</strong><strong>:</strong> Macroscopic algae recorded had biological features and environmental abilities that separated them into two groups. The first included the most frequent and abundant species: <em>Nostoc parmelioides, Placoma regulare, Prasiola mexicana</em> and <em>Vaucheria bursata</em>. The second included species restricted to certain habitats:  <em>Draparnaldia mutabilis, Tetraspora gelatinosa</em>, <em>Batrachospermum gelatinosum </em>and <em>Paralemanea mexicana</em>. Each Phyla responds differentially to the spatial heterogeneity of the streams, but the species does not change between contrasting seasons.</p><p><strong>Conclusions</strong><strong>:</strong> 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.</p>

Publisher

Botanical Sciences, Sociedad Botanica de Mexico, AC

Subject

Plant Science

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