Diversity and Seasonality of Aquatic Beetles (Coleoptera) in Three Localities of the State of Tlaxcala, Central Mexico

Aquatic beetle diversity was compared between three study sites in the state of Tlaxcala, central Mexico: Stream 1 (San Ambrosio), stream 2 Tadeo), and a lake (Acuitlapilco). Sampling took place bimonthly during an annual cycle. A total 2968 specimens were obtained, which grouped into twenty species, fifteen genera, six families (Elmidae, Dryopidae, Dytiscidae, Gyrinidae, Haliplidae, Hydrophilidae). showed highest values abundance (1570 individuals), while had richness (18 species). Abundance two peaks each rainy dry seasons. The proportion rare dominant species similar all sites. Based on accumulation curves, maximum estimated number has not been achieved either Regarding alpha (effective species), presented zero-order with 18.5 species. beta diversity, lotic systems (streams 2) similarity 75%. Finally, regarding trophic structure adult aquatic community, herbivores, predators, decomposers most representative this study. our results, Tlaxcala probably holds significant beetles. This appears to indicate that composition geographic areas, regardless their relatively small size, is worth documenting and, course, preserving.