Diversidade biológica da comunidade de peixes no baixo rio das Mortes, Mato Grosso, Brasil

Melo, Tatiana Lima de; Tejerina‐Garro, Francisco Leonardo; Melo, Cesar Enrique de

doi:10.1590/s0101-81752007000300017

Cited by 15 publications

(21 citation statements)

References 13 publications

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“…Novo Santo Antônio, a municipality located between the Mortes and Araguaia rivers, is the region’s principal arapaima fishery center, and the lakes found along the course of the Mortes River provide the bulk of the catch landed on the Araguaia River ( Kirsten et al, 2012 ). The municipality of São Félix do Araguaia is located at the confluence of the Mortes and Araguaia river, on the Bananal plain ( de Melo et al, 2007 ). Most of the arapaima fishermen of Mato Grosso are resident in this municipality ( Kirsten et al, 2012 ).…”

Section: Methodsmentioning

confidence: 99%

Low Genetic Diversity and Structuring of the Arapaima (Osteoglossiformes, Arapaimidae) Population of the Araguaia-Tocantins Basin

et al. 2017

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The arapaima, Arapaima gigas, is a fish whose populations are threatened by both overfishing and the ongoing destruction of its natural habitats. In the Amazon basin, varying levels of population structure have been found in A. gigas, although no data are available on the genetic diversity or structure of the populations found in the Araguaia-Tocantins basin, which has a topographic profile, hydrological regime, and history of fishing quite distinct from those of the Amazon. In this context, microsatellite markers were used to assess the genetic diversity and connectivity of five wild A. gigas populations in the Araguaia-Tocantins basin. The results of the analysis indicated low levels of genetic diversity in comparison with other A. gigas populations, studied in the Amazon basin. The AMOVA revealed that the Arapaima populations of the Araguaia-Tocantins basin are structured significantly. No correlation was found between pairwise FST values and the geographical distance among populations. The low level of genetic variability and the evidence of restricted gene flow may both be accounted for by overfishing, as well as the other human impacts that these populations have been exposed to over the years. The genetic fragility of these populations demands attention, given that future environmental changes (natural or otherwise) may further reduce these indices and eventually endanger these populations. The results of this study emphasize the need to take the genetic differences among the study populations into account when planning management measures and conservation strategies for the arapaima stocks of the Araguaia-Tocantins basin.

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Section: Methodsmentioning

confidence: 99%

Low Genetic Diversity and Structuring of the Arapaima (Osteoglossiformes, Arapaimidae) Population of the Araguaia-Tocantins Basin

et al. 2017

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“…The fish fauna present in the Araguaia-Tocantins basin is similar to that of the Amazon basin, though with greater number of endemic species (Tejerina-Garro et al 2002;Melo et al 2005). Among recent publications, Melo et al (2004) studied diet of 71 species of fish from a small stream of upper rio Araguaia; Benedito-Cecilio et al (2004) studied a dividing water area of the Parque Nacional das Emas, in the headwaters of the rivers Araguaia (Araguaia basin) and Anaconda (upper Paraná basin), resulting in an account of 18 species; Melo et al (2005) published a catalog comprising 51 medium to large sized fish species from rio das Mortes; Silva et al (2007) investigated the factors that influenced the fish community in the Bananal plain, and found 80 species; Melo et al (2007) found 72 species in the lower rio das Mortes. In the most recent study, Venere and Garutti (2011) listed 162 species in the Ichthyofauna of the rio Araguaia basin, states of Mato Grosso and Goiás, Brazil DOI: 10.15560/10.3.483 Figure 1.…”

Section: Introductionmentioning

confidence: 99%

Ichthyofauna of the rio Araguaia basin, states of Mato Grosso and Goiás, Brazil

Jarduli¹,

Claro-García²,

Shibatta³

2014

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Materials and Methods Study site Fish samples were collected in the region of Serra Azul and Serra do Roncador in the upper-middle Araguaia basin, in the municípios Barra do Garças and Aragarças (Figure 1), in the states of Mato Grosso and Goiás respectively. The climate is tropical wet and characterized by two well defined seasons, rainy season (October to April) and dry season (May to September), with an average temperature of 25.5°C (Pirani et al. 2009). Data collection Ten sites were sampled in the tributaries of the Araguaia basin during the dry season, from July 29 to August 2, 2008 (Table 1). Fish collections were performed using standard ichthyological gear comprising sieves, seine nets and cast nets (IBAMA permit number 12120-1). The sampling effort included 60 minutes of sampling by three people at each site. Fish were fixed in 10% formalin solution and subsequently transferred to 70% ethanol. Species were identified up to the lowest possible taxonomic level, using available literature and further confirmation by experts when possible. The taxonomic classification follows Eschmeyer (2013). Voucher specimens were deposited in the fish collection of the

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“…Large-scale migrations ensure dispersal and spawning and result in large densities of some species in the main channel of rivers during some periods of the year (Bonetto, 1963;Godoy, 1967;Bayley, 1973;Ribeiro, 1983;Carvalho & Mérona, 1986). Lateral migrations between the floodplain and the main channel of large rivers can be linked to feeding strategies as well as strategies for shelter (Cox-Fernandes & Mérona, 1988;Cox-Fernandes, 1997;Melo et al, 2007), which seasonally modify the relative abundance of fish populations in the assemblage.…”

Section: Introductionmentioning

confidence: 99%

Flow seasonality and fish assemblage in a tropical river, French Guiana, South America

Tejerina‐Garro

Mérona

2010

Neotrop. ichthyol.

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The objective of this study is to verify the existence of a seasonal pattern of variation in the fish assemblages of a tropical river using taxonomic and functional descriptors. Fish were sampled using gillnets at two sites on the Comté River, a large-sized river 254.8 km long, flowing entirely through rainforest areas of French Guiana. Samplings were conducted every other month from August 1998 to July 2000. Four types of fish assemblage descriptors were used: the species descriptor (number of individual fish of each species in the sample); the family descriptor (number of individual fish of each family in the sample); the trophic descriptor (distribution of the fish biomass in each feeding guild) and the specific maximum observed size -MOS (number of individual fish in each of four classes of MOS: < 100 mm; 101-200 mm; 201-300 mm; > 300 mm). Results point out that changes in the fish assemblage are related to water level oscillations. The role of migration seems to be weak and is limited to trophic displacements characteristic of few species. In the low-water season, characterized by weak water level oscillation, fish species and families belonging to piscivorous or aquatic invertivorous guilds were predominant, whereas in the high-water season the environment is submitted to strong variations caused by fast and large water level oscillations, and the fish assemblage was characterized by species or families with an opportunistic omnivorous diet.O objetivo deste estudo é verificar a existência de um padrão sazonal da variabilidade das assembleias de peixes de um rio tropical utilizando descritores taxonômicos e funcionais. Os peixes foram amostrados em duas estações localizadas ao longo dos 254,8 km do rio Comté, o qual drena regiões de floresta úmida da Guiana Francesa. As amostragens foram realizadas bimensalmente de agosto de 1998 a julho de 2000 utilizando-se redes de espera. Quatro tipos de descritores da assembleia de peixes foram utilizados: espécies (número de indivíduos de cada espécie na amostra); família (número de indivíduos de cada família na amostra); trófico (distribuição da biomassa de peixes de cada grupo trófico presente na amostra) e o tamanho máximo observado -TMO (número de indivíduos em cada uma das quatro classes de TMO: < 100 mm; 101-200 mm; 201-300 mm; > 300 mm). Os resultados indicam que as mudanças na assembleia de peixes estão relacionadas à oscilação sazonal do nível da água. O papel desempenhado pelas migrações parece fraco e é limitado a deslocamentos tróficos característicos de determinadas espécies. No período da seca, caracterizado por uma fraca oscilação do nível da água, as espécies e famílias predominantes são piscívoras ou invertívoras aquáticas, enquanto que no período da chuva, o ambiente é submetido a fortes mudanças, provocadas por rápidas e amplas oscilações do nível da água, onde as espécies ou famílias características são omnívoras.

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Diversidade biológica da comunidade de peixes no baixo rio das Mortes, Mato Grosso, Brasil

Cited by 15 publications

References 13 publications

Low Genetic Diversity and Structuring of the Arapaima (Osteoglossiformes, Arapaimidae) Population of the Araguaia-Tocantins Basin

Low Genetic Diversity and Structuring of the Arapaima (Osteoglossiformes, Arapaimidae) Population of the Araguaia-Tocantins Basin

Ichthyofauna of the rio Araguaia basin, states of Mato Grosso and Goiás, Brazil

Flow seasonality and fish assemblage in a tropical river, French Guiana, South America

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