info:eu-repo/semantics/article
Bacterioplankton from cenotes and anchialine caves of Quintana Roo, Yucatan Peninsula, Mexico
Bacterioplankton from cenotes and anchialine caves of Quintana Roo, Yucatan Peninsula, Mexico
Autor
Alcocer, Javier
Lugo, Alfonso
Sánchez, María del Rosario
Escobar, Elva
Sánchez, Malinali
Institución
Resumen
The seasonal fluctuation of bacterioplankton densities were evaluated in five cenotes and two anchialine caves of Quintana Roo, northeastern Yucatan Peninsula. Bacterioplankton densities were extremely low (5.8 ± 0.35 x 102 - 8 ± 0.48 x 103 cells/ml), even for oligotrophic environments. Non seasonal differences were detected in the cenotes, however, in the caves bacterial counts were higher in the rainy season. Bacterial densities were lower in the cenotes (5.8 ± 0.35 x 102 - 4.3 ± 0.26 x 101 cells/ml), and higher in the caves (2.7 ± 0.16 x 101 - 8 ± 0.48 x 103 cells/ml). Rainwater percolation, rich in forest'soil particulate (POM) and dissolved organic (DOM) matter into the caves, seems to promote higher bacteria! densities. In addition, surface bacteria entering groundwater in the same way as POM and DOM could also be augmenting bacterial densities in the caves. Low groundwater nutrient (0.05 - 1.7 μM total P, 34.89 - 250.9 μM total N) concentrations as well as reduce bacteria! densities characterizes the cenotes and caves as ultra- to oligotrophic environments. Se determinó la fluctuación. estacional de las densidades del bacterioplancton en cinco cenotes y dos cuevas anquihalinas del noreste de Quintana Roo, Península de Yucatán. Las densidades del bacterioplancton fueron extremadamente bajas (5.8 ± 0.35 x 102 - 8 ± 0.48 x 103 cél/ml). Las densidades bacterianas de los cenotes (5.8 ± 0.35 x 102 - 4.3 ± 0.26 x 103 cél/ml) fueron más bajas que en las cuevas (2.7 ± 0.16 x 103 - 8 ± 0.48 x 103 cél/ml). El agua de lluvia que se percola a las cuevas a través del suelo de la selva rico en materia· orgánica particulada (MOP) y. disuelta (MOD), promueve densidades bacterianas más elevadas. Los cenotes y las cuevas se caracterizaron por ser ambientes de ultraoligotróficos. a oligotróficos como lo indican las concentraciones bajas de nutrimentos (0.05 - 1.7 μM P total, 34.89 - 250.9 μM N total) así como las densidades bacterianas reducidas.