Benthos of a perennially-astatic, saline, soda lake in Mexico |
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| Authors: | Javier Alcocer Elva G Escobar Alfonso Lugo Luis A Oseguera |
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| Institution: | (1) Limnology Lab., Environmental Conservation and Improvement Project, UIICSE, UNAM, Campus Iztacala. Av. de los Barrios s/n, Los Reyes Iztacala, 54090 Tlalnepantla, Estado de México, México;(2) Benthic Ecology Lab., Institute of Marine Sciences and Limnology, UNAM, Apdo. Postal 70-305, 04510 Coyoacán, México, D.F. México |
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| Abstract: | The effects of multiple stressors on the benthic macroinvertebrate community were monitored in Tecuitlapa Norte, a shallow,
perennially-astatic, warm, mesosaline, sodaalkaline lake in Mexico. Physico-chemical and biological variables were determined
monthly for one year. Tecuitlapa Norte displayed a clear seasonal environmental pattern (dry and rainy seasons). The benthic
macroinvertebrate community consisted of five species:Culicoides occidentalis sonorensis Jorgensen,Ephydra hians Say,Stratiomys sp.,Eristalis sp., andLimnophora sp. of which the first two were dominant and the rest scarce.C. occidentalis was the most important species numerically (76 percent of the total), whileE. hians dominated the biomass (73 percent of the total). Primarily salinity and secondarily pH appear to be the most important environmental
factors controlling dominance of benthic organisms in Tecuitlapa Norte. Seasonal abundance dynamics of the dominant organisms
was associated with phases in their reproductive cycles: environmentally-triggered (i.e., temperature rise, water-level descent)
pupation and emergence periods. We concluded that whereas physical and chemical factors (i.e., salinity, pH) exerted the primary
control on benthic macroinvertebrate community composition in Tecuitlapa Norte, another assembly of variables (e.g., water-level,
temperature) influenced species distribution and abundance. |
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| Keywords: | benthic macroinvertebrates crater-lake physico-chemistry shallow lake tropical lake |
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