The stream fish fauna from the rio Machado basin, Rondônia State, Brazil

Casatti, Lílian; Pérez‐Mayorga, María Angélica; Carvalho, Fernando Rogério; Brejão, Gabriel Lourenço; Costa, Igor David da

doi:10.15560/9.6.1496

Cited by 33 publications

(28 citation statements)

References 9 publications

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“…Other studies in the Cerrado region (Lemes and Garutti 2002;Verissimo et al 2005;Aquino et al 2009;Machado et al 2011;Casatti et al 2013) obtained the same results regarding the predominance of the orders Characiformes followed by Siluriformes. These authors emphasized that, in streams, the family Characidae stands out for having the greatest number of species, corroborating the results found in the urban streams of Rondonópolis.…”

Section: Discussionsupporting

confidence: 57%

Fish from urban tributaries to the Vermelho River, upper Paraguay River Basin, Mato Grosso, Brazil

Oliveira¹,

Mateus²,

Loverde-Oliveira³

et al. 2014

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Abstract:The fish fauna of urban streams is still poorly known, it difficult to assess the effects of urbanization expansion on fish species composition, for this reason the aim of this study was to provide a checklist of species that compose the ichthyofauna of six urban streams, tributaries to the Vermelho River, upper Paraguay River Basin, Rondonópolis, Mato Grosso State, Brazil. The samples were performed with seine nets on a spatial gradient of 75 m, and with sieves for a period of 15 minutes in each site. A total of 56 species belonging to five orders, Characiformes, Siluriformes, Gymnotiformes, Cyprinodontiformes, and Perciformes, 21 families and 44 genera were sampled. The most common species were Astyanax asuncionensis Géry, 1972, Astyanax abramis (Jenyns, 1842), Odontostilbe pequira (Steindachner, 1882), Odontostilbe paraguayensis Eigenmann & Kennedy, 1903, Characidium zebra Eigenmann, 1909 and Hypostomus sp. This checklist brings additional knowledge on fish that inhabit tributaries to the major rivers of northern Pantanal.

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Section: Discussionsupporting

confidence: 57%

Fish from urban tributaries to the Vermelho River, upper Paraguay River Basin, Mato Grosso, Brazil

Oliveira¹,

Mateus²,

Loverde-Oliveira³

et al. 2014

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“…This method accounts for 90% of expected richness for this set of streams (Casatti et al. ). Fishes were collected under Instituto Chico Mendes de Conservação da Biodiversidade permits 4355‐1/2012.…”

Section: Methodsmentioning

confidence: 99%

Threshold responses of Amazonian stream fishes to timing and extent of deforestation

Brejão

Hoeinghaus

Pérez‐Mayorga

et al. 2018

Conservation Biology

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Deforestation is a primary driver of biodiversity change through habitat loss and fragmentation. Stream biodiversity may not respond to deforestation in a simple linear relationship. Rather, threshold responses to extent and timing of deforestation may occur. Identification of critical deforestation thresholds is needed for effective conservation and management. We tested for threshold responses of fish species and functional groups to degree of watershed and riparian zone deforestation and time since impact in 75 streams in the western Brazilian Amazon. We used remote sensing to assess deforestation from 1984 to 2011. Fish assemblages were sampled with seines and dip nets in a standardized manner. Fish species (n = 84) were classified into 20 functional groups based on ecomorphological traits associated with habitat use, feeding, and locomotion. Threshold responses were quantified using threshold indicator taxa analysis. Negative threshold responses to deforestation were common and consistently occurred at very low levels of deforestation (<20%) and soon after impact (<10 years). Sensitive species were functionally unique and associated with complex habitats and structures of allochthonous origin found in forested watersheds. Positive threshold responses of species were less common and generally occurred at >70% deforestation and >10 years after impact. Findings were similar at the community level for both taxonomic and functional analyses. Because most negative threshold responses occurred at low levels of deforestation and soon after impact, even minimal change is expected to negatively affect biodiversity. Delayed positive threshold responses to extreme deforestation by a few species do not offset the loss of sensitive taxa and likely contribute to biotic homogenization.

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“…Streamlets in mainland forests are important components of the Amazon fluvial system as they shelter many fish species (Casatti et al 2013), particularly small species with a total length of less than 100 mm (Bührnheim 2002). The family Cichlidae includes approximately 105 genera, with 1,300 species of freshwater and brackish water fish described, and is considered one of the largest families of fish although Kullander (2003) believes the number of species has probably been underestimated.…”

Section: Discussionmentioning

confidence: 99%

“…The family Cichlidae includes approximately 105 genera, with 1,300 species of freshwater and brackish water fish described, and is considered one of the largest families of fish although Kullander (2003) believes the number of species has probably been underestimated. It is also considered one of the most specious and common families in streamlets in the Amazon Forest (Mendonça et al 2008;Casatti et al 2013).…”

Section: Discussionmentioning

confidence: 99%

The seasonal diet of Aequidens tetramerus (Cichlidae) in a small forest stream in the Machado River basin, Rondônia, Brazil

Costa

Soares

2015

Acta Amaz.

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Trophic relationships in fish communities are affected by the availability of resources, which in turn is affected by spatial and temporal variations throughout the year. The aims of this study were to characterize the diet of A. tetramerus in a streamlet in the north of Brazil and compare its composition in different hydrological seasons (wet and dry seasons). Collections were performed every two months from October 2011 to September 2012 with the aid of seine nets, hand net and fishing traps in the streamlet located in the Machado River drainage basin in the Rondônia state. Most of the specimens collected were quite small (< 40 mm) and had empty stomachs. Our results showed that A. tetramerus feeds on a wide variety of items of plant origin, such as algae, seeds and leaves, as well as items of animal origin, including bryozoans, crustaceans, fish scales, terrestrial insects and detritus. The data also indicated higher consumption of aquatic insects than other food items, suggesting a primarily insect-based diet. Items of plant and allochthonous origin were consumed more in the wet season than in the dry season, but there were no seasonal differences in the consumption of animal and autochthonous items. KEYWORDS: Fish, Perciformes, Amazon, feeding habits, ornamental fish. Dieta sazonal de Aequidens tetramerus (Cichlidae) em um igarapé da bacia do rio Machado, Rondônia, Brasil RESUMORelações tróficas das comunidades de peixes são afetadas por variações espaciais e temporais, que alteraram a disponibilidade de recursos ao longo do ano. Os objetivos deste estudo foram caracterizar a dieta de A. tetramerus no igarapé estudado, bem como comparar se a composição dos itens da dieta desta espécie dependem da estação hidrológica (período chuvoso e seco). As coletas foram realizadas bimestralmente, de Outubro de 2011 a Setembro de 2012, com auxílio de picaré, puçá e covos em um igarapé localizado na bacia do rio Machado no estado de Rondônia. A maioria dos espécimes eram pequenos (< 40 mm) e tinham estômago vazio. Observou-se que A. tetramerus se alimenta de uma grande variedade de itens de origem vegetal, como algas, sementes e folhas; e de itens de origem animal como: briozoários, crustáceos, escamas, insetos terrestres e detritos. Constatou-se que há maior consumo de insetos aquáticos, o que sugere uma dieta insetívora. Itens de origem vegetal e alóctones foram mais consumidos na estação chuvosa do que na estação seca. Não houve diferença na composição da dieta dos peixes entre as estações de seca e chuva.

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The stream fish fauna from the rio Machado basin, Rondônia State, Brazil

Cited by 33 publications

References 9 publications

Fish from urban tributaries to the Vermelho River, upper Paraguay River Basin, Mato Grosso, Brazil

Fish from urban tributaries to the Vermelho River, upper Paraguay River Basin, Mato Grosso, Brazil

Threshold responses of Amazonian stream fishes to timing and extent of deforestation

The seasonal diet of Aequidens tetramerus (Cichlidae) in a small forest stream in the Machado River basin, Rondônia, Brazil

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