Macroinvertebrados associados a bancos de Macrófitas aquáticas em uma área de várzea na comunidade de Boa Vista do município de Benjamin Constant - AM

Abstract

Macrophytes are essential for macroinvertebrates colonization. The richness and diversity of aquatic fauna is related to the diversity and distribution of the aquatic macrophyte community. This study aimed to characterize the macroinvertebrate community associated with macrophytes banks in an Amazon floodplain lake of the Boa Vista community in the municipality of Benjamin Constant – AM, Brazil. The study was carried out in the Southwest Amazon Mesoregion, in the Alto Solimões Microregion, in the Boa Vista community located four kilometers from Benjamin Constant city and 910 m from the Peruvian border. Data collection was performed during August and September of 2019. Three monthly visits were made (once per week); three banks were collected during each visit, totaling 18 sampled banks. We collected 720 individuals distributed among Annelida, Mollusca and Arthropoda phyla and 29 unidentified morphospecies. According to the richness and abundance of taxa, Coleoptera order was the most representative and was present in all the collected macrophyte banks, with highlighting to the abundance of some species of the family Hydrophilidae. Our results of diversity index and richness estimator for macroinvertebrates, showed that the presence of aquatic macrophyte banks composed by floating plants with larger root systems seem to possess the needed characteristics to provide a greater richness of macroinvertebrates, this is due to the higher number of associated individuals in the macrophyte roots.