Estimated richness and environmental correlates of miniature fish assemblages in the rio Jacundá, Brazil

Author(s)

Joshuah S. Perkin ^[1] ; Carmen G. Montaña ^[2] ; Esteban J. Nogueira ^[3] ; Bianca B. Brandão ^[4] ; George M. T. Mattox ^[5] ; Kevin W. Conway ^[6]

Affiliation

^[1] Texas A&M University. Department of Ecology and Conservation Biology - Estados Unidos

^[2] Stephen F. Austin State University. Department of Biology - Estados Unidos

^[3] Universidade Federal de São Carlos. Laboratório de Ictiologia de Sorocaba. Departamento de Biologia - Brasil

^[4] Universidade Federal de São Carlos. Laboratório de Ictiologia de Sorocaba. Departamento de Biologia - Brasil

^[5] Universidade Federal de São Carlos. Laboratório de Ictiologia de Sorocaba. Departamento de Biologia - Brasil

^[6] Texas A&M University. Department of Ecology and Conservation Biology - Estados Unidos

• Document type: Journal article
• Source: Neotropical Ichthyology; v. 20, n. 2 2022-05-11.

Abstract

Abstract South America is home to more miniature fishes (<26 mm in standard length) than any other continent. Despite this diversity, the ecology of miniature fishes is poorly studied. To promote the study of miniature fish ecology, we investigated patterns in total richness, assemblage structure and environmental correlates for miniature fishes in the rio Jacundá drainage of the Lower Amazon River basin, Pará State. Based on multi-pass dip-netting of leaf litter at 20 locations distributed across two sites, we collected miniature species and used rarefaction to estimate 9 to 14 species might be present. The miniature fish assemblage at the upstream site was a nested subset of the downstream site, and water pH and canopy cover, two features known to be altered by deforestation, correlated most strongly with assemblage variation. Our work represents one of the first quantitative assessments of environmental correlates with miniature fish assemblages and highlights research topics that should be investigated further to promote conservation and preservation of the overlooked and understudied Amazonian diminutive freshwater fish fauna. (AU)

• FAPESP's process: 18/22592-0 - Live fast, die young in the Amazon: testing life history predictions for the Amazon's smallest vertebrates through international collaboration between TAMU and UFSCar
• Grantee: George Mendes Taliaferro Mattox
• Support type: Regular Research Grants
• FAPESP's process: 17/01970-4 - Integrating morphological and molecular data in the taxonomic and phylogenetic study of the miniature fish Priocharax Weitzman & Vari (Teleostei, Characiformes, Characidae)
• Grantee: George Mendes Taliaferro Mattox
• Support type: Research Grants - Young Investigators Grants