Abstract
The rio Machado is an large tributary of the rio Madeira, and investigations of the ichthyofauna are urgent given the current high threat of habitat loss on account of a hydroelectric plant under construction. Our inventory quantified 9,544 specimens, representing four orders and 38 species. Our study provides an unprecedented list of fish species from a poorly studied South American basin. This basin, which is considered one of the world’s biodiversity hotspots, presents high endemism, few cases of co-existence of phylogenetically related lineages, low species diversity, and few species occurrences with wide distribution.
Highlights
IntroductionEspecially in tropical regions, hold a high diversity of freshwater fish (LoweMcConnell 1987; Freitas et al 2010; Queiroz et al 2013)
River and floodplain systems, especially in tropical regions, hold a high diversity of freshwater fish (LoweMcConnell 1987; Freitas et al 2010; Queiroz et al 2013)
Our study provides an unprecedented list of fish species from a poorly studied South American basin
Summary
Especially in tropical regions, hold a high diversity of freshwater fish (LoweMcConnell 1987; Freitas et al 2010; Queiroz et al 2013). According to Myers et al (2000), the region where the rio Machado basin is inserted is considered one of the world’s biodiversity hotspots This bioregion is characterized by high endemism, few cases of co-existence of phylogenetically related lineages, low species diversity, and few occurrences of species with wide distribution (Dagosta et al 2020). In the present study we present a survey of the ichthyofauna associated with sandy beaches of the rio Machado, the main tributary of the rio Madeira right bank in the state of Rondônia, northern Brazil. This investigation becomes even more urgent and necessary due to such as the current construction of a hydroelectric plant
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