Temporal and spatial distribution of the ichthyofauna in two streams of the upper Rio Paraná basin

Pavanelli, Carla Simone; Caramaschi, Érica Pellegrini

doi:10.1590/s1516-89132003000200019

Cited by 26 publications

(23 citation statements)

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“…Exceptions are the studies of Agostinho & Penczack (1995), Abes & Agostinho (2001), Pavanelli & Caramaschi (2003), Súarez (2008) and Súarez & Lima-Júnior (2009). The biology and ecology of stream-dwelling species remain poorly studied, possibly as a result of inadequate taxonomic knowledge, however, the high isolation level and variability in environmental conditions can lead to development of great history life strategies in stream fish, them reinforcing the need of study these fish species to define possible responses to environmental degradations.…”

Section: Introductionmentioning

confidence: 99%

Population aspects of Bryconamericus stramineus in streams of the upper Paraná River basin, Brazil

2011

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Abstract:In order to describe some aspects of the population ecology of Bryconamericus stramineus in the Guiraí River basin, upper Paraná River basin, samples were taken bimonthly from October 2006 to August 2007 at seven sites in the basin. A total of 960 individuals, including 532 females, 316 males, and 112 of undetermined sex, were collected. A significant variation in the sex ratio was observed (χ 2 = 32.82; p < 0.001). Females were larger (59.7 mm) than males (58.9 mm); however, males showed a larger angular growth coefficient (b) than females. It was estimated that 50% of females were sexually mature at 36.4 mm. The highest rate of ovary development was observed in October, while in June 2007 no mature females were found. Mean fecundity was estimated at 313 eggs, and the relative fecundity was 184.6 eggs/g. The asymptotic was estimated at 62.8 mm and the growth rate at 0.76. The growth performance index was calculated at 3.47, the longevity at 3.94 years and the mortality (M) at 1.18 years. The recruitment pattern of the species showed peaks concentrated in periods of low rainfall. Keywords: length-weight relationship, mortality, reproductive strategy, sex ratio. Neotrop., vol. 11, no. 2 In which season does reproductive activity of B. stramineus increase in the streams sampled? 5) What is the mean standard length at which females reach first maturation? 6) Is there any relationship between fecundity and the size of females? 7) Are seasonal differences in recruitment patterns for studied population? 8) What are the growth and mortality parameters for B. stramineus in sampled streams? Material and Methods Study siteThe Guiraí River basin (22° 45' S, 54° 30' W and 22° 15' S, 53° 30' W), occupies an area of approximately 2,248 km 2 and includes seven municipal districts. The mouth of the Guiraí River is located at an altitude of 370 m a.s.1., and the river flows for approximately 100 km until it enters the Ivinhema River, at 238 m of altitude. In its lower portion, it forms the boundary of the Parque Estadual das Várzeas do rio Ivinhema. Field and laboratory methodsThe fish samples were taken bimonthly from October 2006 to August 2007 at seven sites in the Guiraí River basin (Figure 1). The streams were selected for their location in the basin and ease of access.The samples were taken during daylight, with a rectangular sieve measuring 1.2 × 0.8 m (2 mm mesh size) and standardized effort (20 throws) at each site, with approximately 100-m long hauls. The equipment was slide to sweep the substrate toward the banks of the stream. This technique was used because of the difficulties of using the electric fishing in these streams, such as low electrical conductivity and high turbidity, and also due to difficult access. The permission for fish retrieval was granted by IBAMA (#13458-1).Specimens were fixed in 10% formalin and preserved in 70% ethanol for subsequent identification. Voucher specimens were deposited at the Coleção de Peixes do Nupelia (NUP/UEM # 9322).In the laboratory, some biometric data were mea...

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Section: Introductionmentioning

confidence: 99%

Population aspects of Bryconamericus stramineus in streams of the upper Paraná River basin, Brazil

2011

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“…It is commonly found in the Upper Paraná River basin (Garutti and Britski, 2000), where the Alagados Reservoir is located . A peculiar characteristic of A. paranae is its restricted distribution to low order rivers (Godoy, 1975;Castro and Casatti, 1997;Garutti and Britski, 2000;Vilella et al, 2002;Pavanelli and Caramaschi, 2003;Benedito-Cecilio et al, 2004) where it forages predominantly on the insects and plant matter (Castro and Casatti, 1997;Vilella et al, 2002;Ferreira, 2004;Bennemann et al, 2005). A. paranae has also been described as a short life cycle species (Barbieri, 1992a).…”

Section: Introductionmentioning

confidence: 99%

Population structure, condition factor and reproductive period of Astyanax paranae (Eigenmann, 1914) (Osteichthyes: Characidae) in a small and old Brazilian Reservoir

Abelha

Goulart

2008

Braz. arch. biol. technol.

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“…Angermeier & Karr 1983, Ibarra & Stewart 1989, Wikramanayake 1990, Hugueny & Paugy 1995, Castro & Casatti 1997, Casatti et al 2001, Fogaça et al 2003, Barreto & Aranha 2005, Langeani et al 2007). Dentre as variações registradas na literatura, fica destacado que as menores diversidades ocorrem nas áreas de cabeceira ou próximas a ela enquanto nas áreas de desembocadura ou confluência o número de espécies é sempre superior (Matthews 1986, Edds 1993, Pavanelli & Caramaschi 1997, Abes & Agostinho 2001, Barreto & Uieda 1998, Uieda & Barreto 1999, Pavanelli & Caramaschi 2003, Bifi et al 2006, Perez-Jr. & Garavello 2007. No caso do presente estudo, os três riachos estudados foram amostrados em áreas de baixada, próximo à confluência com o rio Tocantins, fato que pode explicar a alta diversidade como função da ictiofauna Biota Neotrop.,vol.…”

Section: Discussionunclassified

Estrutura e persistência temporal da comunidade de peixes de três riachos do Alto Rio Tocantins, GO

Miranda

Mazzoni

2009

Biota Neotrop.

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Three streams from the upper Tocantins basin were studied in order to describe community structure and temporal persistence of fish species composition. Fish densities of each stream were compared between them and with other streams from Neotropical, Austral and Holartic regions. Forty six species were registered but only 18 co-occurred in the three studied streams. Two streams presented similar species composition, but temporal variations of species densities differed among them. High persistence was registered to Água Boa and Cavalo streams whereas low persistence was registered to Acaba Saco stream. No significant differences were registered for species densities of each studied stream, nonetheless, Cavalo were that tending to support the highest fish densities. The values of fish density found in the present study were very similar to those found in other geographic regions such as Temperate and Tropical areas. Resumo: Três riachos do alto rio Tocantins foram estudados para determinação da estrutura e persistência temporal das comunidades de peixes. As densidades das populações que compõem cada comunidade foram comparadas entre os três riachos estudados e entre os mesmos e alguns registros disponíveis para outros riachos das regiões Neotropical, Austral e Holártica. Registramos 46 espécies, sendo que apenas 18 espécies foram compartilhadas pelos três riachos. A análise de similaridade revelou que dois riachos têm composição de espécies muito similar, porém com variações temporais distintas. Os córregos Água Boa e Cavalo apresentaram alta persistência na estrutura de suas comunidades enquanto que para o córrego Acaba Saco registramos baixa persistência. Não houve diferença significativa nas densidades médias das espécies dos três córregos, sendo que o Cavalo foi aquele que apresentou tendência a suportar maiores densidades. Nossos resultados indicam que os valores de densidade registrados para os córregos estudados são similares a resultados registrados em outras regiões geográficas, como áreas Temperadas e Tropicais. Palavras-chave: bacia Araguaia-Tocantins, peixes de riacho, densidade, persistência, estabilidade.

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Temporal and spatial distribution of the ichthyofauna in two streams of the upper Rio Paraná basin

Abstract: The temporal and spatial distribution of the ichthyofauna was assessed in two streams

Cited by 26 publications

References 4 publications

Population aspects of Bryconamericus stramineus in streams of the upper Paraná River basin, Brazil

Population aspects of Bryconamericus stramineus in streams of the upper Paraná River basin, Brazil

Population structure, condition factor and reproductive period of Astyanax paranae (Eigenmann, 1914) (Osteichthyes: Characidae) in a small and old Brazilian Reservoir

Estrutura e persistência temporal da comunidade de peixes de três riachos do Alto Rio Tocantins, GO

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