2004
DOI: 10.1590/s1679-62252004000300004
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Abstract: Spatial and temporal variation in the benthic fish composition, species richness, density and biomass were studied in the lower rio Branco and its confluence with the rio Negro during the 1997-98 dry season (September to February). Samples were taken with a 5.28 m (16-ft) otter trawl in three expeditions and at two depth strata (<7m and >7m). Five to seven trawl hauls were made randomly in each sample site per expedition. A total of 58 trawls yielded 134 species, 5,657 individuals and 22 kg total biomass. Fish… Show more

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Cited by 13 publications
(18 citation statements)
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“…Analyzing the taxonomic composition of the fish fauna by environment, it was verified that ostariophysans dominates in most types of habitats, but with differences reflecting the ecological particularities of each group. In the deep waters of the main river channel, Siluriformes (catfishes) and Gymnotiformes (electric fishes) dominate the assemblages (Chao 2001; Thomé-Souza and Chao 2004; Ferreira et al 2007; Rapp Py-Daniel et al 2017). Thomé-Souza and Chao (2004), studying the ichthyofauna of the channels of the Negro and Branco rivers, verified that these environments presented differences in composition, species richness and abundance throughout the hydrological periods, which was presumed to be the result of predation and migration.…”
Section: Discussionmentioning
confidence: 99%
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“…Analyzing the taxonomic composition of the fish fauna by environment, it was verified that ostariophysans dominates in most types of habitats, but with differences reflecting the ecological particularities of each group. In the deep waters of the main river channel, Siluriformes (catfishes) and Gymnotiformes (electric fishes) dominate the assemblages (Chao 2001; Thomé-Souza and Chao 2004; Ferreira et al 2007; Rapp Py-Daniel et al 2017). Thomé-Souza and Chao (2004), studying the ichthyofauna of the channels of the Negro and Branco rivers, verified that these environments presented differences in composition, species richness and abundance throughout the hydrological periods, which was presumed to be the result of predation and migration.…”
Section: Discussionmentioning
confidence: 99%
“…180 fish species that were donated to the Museum of Natural History of London; such pictorial records were later found in the museum archives and published in a book by Toledo-Piza Ragazzo (2002). In addition to the seminal work of Goulding et al (1988), more recent studies have provided complementary information regarding the Rio Negro fish fauna, which include ecological studies of the main river channel (Chao et al 2001; Thomé-Souza and Chao 2004; Ferreira et al 2007; Rapp Py-Daniel et al 2017), lakes and flooded forest areas (igapós) (Garcia 1993; Saint Paul et al 2000; Soares and Yamamoto 2005; Ferreira et al 2007; Noveras et al 2012; Yamamoto et al 2014; Farias et al 2017; Beltrão and Soares 2018), seasonal beaches and rapids (Lima et al 2005; Ferreira et al 2007), streams and small marginal ponds (Knöppel 1970; Silva 1993, 1995; Mendonça et al 2005; Pazin et al 2006; Anjos and Zuanon 2007; Zuanon et al 2015; Beltrão and Soares 2018), interfluvial swamps (Chao and Prada-Pedreros 1995), flooded Savannah-like areas (Ferreira et al 2007), as well as ichthyofaunal inventories of specific tributaries (Henderson and Walker 1986; Chao and Prada-Pedreros 1995; Zuanon et al 1998; Lima et al 2005; Ferreira et al 2007; Zuanon et al 2008; Kemenes and Forsberg 2014; Rapp Py-Daniel et al 2017). This study aimed to make a comprehensive survey of the fish species present in the Rio Negro basin, as well as to analyze the fish diversity associated to the different aquatic environments present in the basin (Goulding et al 1988).…”
Section: Introductionmentioning
confidence: 99%
“…They concluded that these extreme events could lead to both local and regional loss of fish, especially those species in low abundance and demonstrating niche specialization. During an intense drought in 1997, Thomé‐Souza and Chao () reported a significant decrease in the biomass and richness of benthic fish fauna in the Negro and Branco rivers. The authors attributed these decreases to the redistribution of some species to deeper waters (refugia) to avoid the shallow, warmer and hypoxic waters and elevated rates of predation (Thomé‐Souza and Chao, ).…”
Section: Discussionmentioning
confidence: 99%
“…During the 14 months of the study, the bottom‐trawl sampling of the Madeira River resulted in very low overall abundances of larvae and juvenile fishes compared with other studies in the Amazon and Orinoco Basins (López‐Rojas et al ., ; Cox‐Fernandes et al ., ; Thomé‐Souza & Chao, ). As the same sampling protocol and gear yielded larger abundances in these studies, the low abundances observed in the Madeira can be considered as a robust result.…”
Section: Standard Length (Ls) Range (Mean ± Sd) Of the Specimens Ofmentioning
confidence: 99%