caa a22 4500 606228217 CHVBK 20210128101202.0 cr unu---uuuuu 210128e20150201xx s 000 0 eng 10.1007/s10641-014-0298-8 doi (NATIONALLICENCE)springer-10.1007/s10641-014-0298-8 Relationship between environmental and geographic factors and the distribution of exotic fishes in tributaries of the balsas river basin, Mexico [Elektronische Daten] [Humberto Mejía-Mojica, Topiltzin Contreras-MacBeath, Gorgonio Ruiz-Campos] The alteration of aquatic ecosystems and increasing aquarium fish trade with exotic species is promoting the presence and invasion of these species in large river systems, with the consequent loss of native biodiversity and the homogenization of aquatic systems. The Chontalcuatlan-Amacuzac hydrological system belonging to the biogeographical province of the Balsas River is one of the main regions in Mexico devoted to the breeding and rearing of aquarium fish, where the improper handling of these organisms has caused their escape to adjacent hydrological systems and, together with urban and industrial pollution, are changing schemas and levels of regional biodiversity. As a first approximation to determine these effects, we evaluate a segment of 140km of this hydrological system through surveys in 12 sites during the time of major climatic and flow stability, and relating environmental variables with the distribution and abundance of fish. Also, the structure of fish assemblages was assessed by means of similarity and multivariate statistical methods (correspondence and principal components analysis), and these assemblages were found to be segregated by a thermal gradient. Exotic fish were dominant in conditions of low environmental quality, while native species were restricted to areas with better quality of water and geographic isolation. Exotic taxa such as Amatitlania nigrofasciata, Pterigloplictys disjunctivus, Pterigloplictys pardalis, Poeciliopsis gracilis and Heterandria bimaculata, have achieved the degree of invasive due to the fact that they are distributed of abundant manner in the entire hydrological system. Springer Science+Business Media Dordrecht, 2014 Fishes nationallicence Invasive species nationallicence Environmental variables nationallicence Biotic homogenization nationallicence Mejía-Mojica Humberto Centro de Investigaciones Biológicas (CIB), Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, Cuernavaca, Morelos, Mexico aut Contreras-MacBeath Topiltzin Centro de Investigaciones Biológicas (CIB), Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, Cuernavaca, Morelos, Mexico aut Ruiz-Campos Gorgonio Facultad de Ciencias, Universidad Autónoma de Baja California, Km.106 carr. Tijuana-Ensenada, Ensenada, Baja California, Mexico aut Environmental Biology of Fishes Springer Netherlands 98/2(2015-02-01), 611-621 0378-1909 98:2<611 2015 98 10641 https://doi.org/10.1007/s10641-014-0298-8 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10641-014-0298-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Mejía-Mojica Humberto Centro de Investigaciones Biológicas (CIB), Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, Cuernavaca, Morelos, Mexico aut NATIONALLICENCE 700 1- Contreras-MacBeath Topiltzin Centro de Investigaciones Biológicas (CIB), Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, Cuernavaca, Morelos, Mexico aut NATIONALLICENCE 700 1- Ruiz-Campos Gorgonio Facultad de Ciencias, Universidad Autónoma de Baja California, Km.106 carr. Tijuana-Ensenada, Ensenada, Baja California, Mexico aut NATIONALLICENCE 773 0- Environmental Biology of Fishes Springer Netherlands 98/2(2015-02-01), 611-621 0378-1909 98:2<611 2015 98 10641