| http://www.w3.org/ns/prov#value | - Increased urbanization, especially near Mexico City, in combination with other threats such as forest clearance, water extraction, pollution and the introduction of fishes, including trout, catfish and centrarchids (sunfishes and bass), carp (Cyprinus carpius) and mosquitofish (Gambusia), and frogs (Lithobates catesbeianus) for exploitation have caused a decline in some populations of this species
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