Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Diversity of aquatic mollusks and crustaceans in three zones in the Río Usumacinta basin, Mexico.

Abstract

Mollusks and crustaceans are important in making energy available to upper trophic levels, besides, they are indicators of aquatic ecosystems condition. Diversity and abundance were determined by diurnal samples in lotic and lentic systems in 3 zones: delta 1 and 2 floodplain (PD) and fluvial highlands (MF) of the Usumacinta river basin during hydrological periods of minimum flooding, transition and maximum flooding. A total of 236,250 organisms was collected, which belong to 35 and 13 species of mollusks and crustaceans, with 99% and 1% of the total abundance, respectively. The 85% of the abundance of mollusks was represented by Melanoides tuberculata and Tarebia granifera (invasive species), whereas the 67% of the crustaceans was represented by Macrobrachium sp. and Penaeus duorarum. The highest diversity for mollusks was in zone PD2 (H′=2.4); in lotic (H′=2.9) and min-1 season (H′=2.2). Regarding the crustaceans, the highest diversity was in PD1 (H′=2.2), in lotic (H′=65 2.0) and in max-1 season (H′=2.1). The diversity varied due to habitat heterogeneity and marine influence recorded.