Changes in Water Quality with Increasing Ambient Temperatures Affect the Distribution and Relative Abundance of 10 Species of Balitorid Fishes in Small Streams of Eastern Thailand

Stream degradation increases with high anthropogenic activity and climate variability, while declines occur in biodiversity. However, few studies have been undertaken on tropical waterways, a major impediment to biodiversity conservation. The present study was conducted 95 relatively pristine small streams Eastern Thailand 10 reasonably uncommon species of balitorid fishes. Measurements were made 21 physical chemical factors the substrate particle size. Stepwise regression identified direct importance size nitrate species’ richness balitorids, whereas its abundance negatively related iron concentrations. A Canonical Correspondence Analysis three fish groups: 1st group correlated ammonia positively dissolved silica, 2nd stream ambient temperature concentration, 3rd low respectively. results this may indicate vulnerability balitorids under warming pressure that alter water physicochemical river including type. Thus, conservation framework should be provided regarding limits for temperature, ammonia, Thailand’s Water Quality Criteria better protect freshwater ecosystem. Balitorid is potential bioindicator evaluating effect combination nutrient stressors as long way-of-life habits are taken into account.