edaphic collembola from two agroecosystems with contrasting irrigation type in hidalgo state, mexico

Abstract

This study was done in San Salvador and El Bondho, Mezquital valley, Hidalgo State, Mexico, with the aim of comparing the Collembola community from two plots with the same edaphic classification: San Salvador is irrigated with waste water (residual water) from Mexico City, and El Bondho, is watered from a well (sweet water). A total of 5967 Collembola from 31 species were obtained of which 19 are new records for Hidalgo State

4833 specimens were from San Salvador and 1134 from El Bondho. Their species richness was 29 and 19, respectively. Dominant species both in abundance and frequency were Proisotoma minuta, Cryptopygus thermophilus, Xenylla grisea and Hypogastrura essa at San Salvador. Diversity and evenness were higher there than in El Bondho

in addition the species richness was lower than at San Salvador

mainly due to the dominant species. Similarity coefficient shows a disturbance in the composition of the Collembola communities, with only 70% of similarity among both plots. The irrigation type affects the density of some species like X. grisea, Folsomides parvulus, Cryptopygus ca. benhami, Pseudosinella octopunctata and C. thermophilus and composition in both plots while Lepidocyrtus violaceus, Pseudosinella violenta and Sphaeridia serrata are affected by irrigation kind and sampling date. Soil properties, such pH, EC, OM and exchangeable contents of cations (Mg2+, Na+) appear to affect the composition and abundance of the Collembola communities. (c) 2006 Elsevier B.V. All rights reserved.