Variação temporal e espacial de ovos e de larvas das espécies de interesse para a pesca na sub-bacia do rio Miranda, Pantanal, Estado do Mato Grosso do Sul, Brasil

Nascimento, F. L.; Nakatani, Keshiyu

doi:10.4025/actascibiolsci.v27i3.1314

Cited by 3 publications

(3 citation statements)

References 1 publication

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“…The high sediment concentrations recorded here could lead to decreases in macroinvertebrate abundances via smothering and scouring (Wantzen, 1998) and in fish habitat availability and even direct physical harm, with typical values of 100 mg.L -1 or more being potentially deleterious for fish (Kjelland et al, 2015). Fish larvae have been found in the channels of the Miranda river, with reproduction during the summer months occurring in the upper and middle parts of the river (Nascimento & Nakatani, 2005), thus coincident with the highest concentrations of suspended solids recorded in the present study. Additionally, while low concentrations of algae can be beneficial in the sense of diminished water treatment problems, these organisms serve as food for zooplankton and benthos , which in turn are consumed by fish; thus, depressed algal production could eventually hamper fish production.…”

Section: Discussionsupporting

confidence: 52%

Influence of nutrient levels, travel time and light availability on phytoplankton chlorophyll-a concentrations in a neotropical river basin

2022

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Aim Knowledge of the factors influencing the biomass of phytoplankton in rivers is important with reference to the characterization of water quality and predicting the effects of environmental change on such ecosystems. The present study quantified the concentrations of chlorophyll-a in the water column of the Miranda River Basin, located in western Brazil, contributing to form the Pantanal Wetland, and attempted to identify the primary environmental influences on the phytoplankton biomass. Methods Temperature, depth, current speed, turbidity, Secchi transparency and concentrations of nutrients, suspended solids and chlorophyll-a were measured at approximate monthly intervals during the course of a year, at five upland and three lowland sites. Relationships between chlorophyll-a and nutrient concentrations, travel times and light availability were examined. Results Nutrient levels were generally low, being oligo- to mesotrophic. High levels of suspended solids were recorded (up to approximately 250 mg.L-1), especially in the rainy season at the upland sites. The latter showed low chlorophyll-a concentrations, while lowland sites, with the exception of one, showed two peaks, one in winter (dry season) and the other in summer (wet season), of 4.9 and 2.4µg.L-1, respectively, coincident with reduced concentrations of suspended solids. Conclusions The low nutrient levels recorded may have been due to the main land use being cattle rearing. The high solids concentrations found may have been due to the degradation of native vegetation, especially riparian, that has occurred over the past decades. Travel times of approximately three to four days may have been a factor in retarding algal abundance in the upland sites, as opposed to approximately ten days in the lowland sites, where light limitation may have been a factor reducing algal growth.

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Section: Discussionsupporting

confidence: 52%

Influence of nutrient levels, travel time and light availability on phytoplankton chlorophyll-a concentrations in a neotropical river basin

2022

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“…In a study of the reproductive dynamics of Moenkhausia sanctaefilomenae in marginal lagoons along the Cuiabá River, Lourenço et al (2008) found females of this species with mature gonads in December. Similarly, in the subbasin of the Miranda River in the southern Pantanal, higher larval densities were found in the months of November to February (Nascimento & Nakatani, 2005), which are all hydrological moments of the beginning of high waters. Therefore, in the sampled period, the reproduction peak found in December reinforces the assumption that the reproduction of most of the floodplain species is highly seasonal, coinciding with the initial flood phases, as reported by Welcomme (1979).…”

Section: Discussionmentioning

confidence: 86%

Spatial and temporal distribution of fish larvae in marginal lagoons of Pantanal, Mato Grosso State, Brazil

2010

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An analysis was made of the spatial and temporal distribution of the abundance and composition of fish larvae assemblies, aiming to ascertain correlations with biotic and abiotic factors in marginal lagoons of the Cuiabá River floodplain in Brazil's Pantanal wetlands. Samples were collected bimonthly in the pelagic region of the marginal lagoons (fourteen lagoons) close to the littoral zone covered by aquatic macrophytes from December 2006 to April 2007. The captured individuals consisted of 2,739 larvae, represented predominantly by Triportheus spp. (Characidae), Parodontidae, Anostomidae, Characidae and Serrasalmidae. Larval density varied among the sample lagoons in December, but the biotic (zooplankton density) and abiotic (water temperature, electrical conductivity, dissolved oxygen, pH, water transparency and lagoon depth) factors did not significantly affect larval composition and abundance. Larvae were captured throughout the sample period, with the highest densities occurring in December and early January. Temporally, lagoon depth, water transparency and fluviometric level showed a negative correlation with larval density. Both the zooplankton and the larval density vary positively, responding likewise to the environmental conditions imposed by flooding. The highest larval density was also found to coincide with the first rains (early December), when the rainfall has not yet reached its peak.Foi realizada uma análise da distribuição espaço-temporal da abundância e composição da assembleia de larvas de peixes, com o objetivo de verificar as correlações com os fatores bióticos e abióticos em lagoas marginais da planície de inundação do rio Cuiabá, Pantanal, Brasil. As amostras foram coletadas quinzenalmente na região pelágica das lagoas, perto da zona litorânea coberta por macrófitas aquáticas, de dezembro de 2006 à março de 2007, na planície de inundação. Foram capturadas 2.739 larvas, representadas predominantemente por Triportheus spp. (Characidae), Parodontidae, Anostomidae, Characidae e Serrasalmidae. A densidade de larvas variou entre as lagoas amostradas em dezembro, mas as variáveis bióticas (densidade de zooplâncton) e abióticas (temperatura da água, condutividade elétrica, oxigênio dissolvido, pH, transparência e profundidade da lagoa) não afetaram significativamente a composição e a abundância das larvas. As larvas foram capturadas ao longo de todo o período de amostragem, com maiores densidades no mês de dezembro e início de janeiro. Temporalmente, a profundidade da lagoa, a transparência e o nível fluviométrico mostraram uma correlação negativa com a densidade de larvas. Tanto a abundância de zooplâncton, quanto à abundância de larvas variaram positivamente, respondendo da mesma forma às condições ambientais impostas pela cheia. A maior densidade de larvas coincidiu com as primeiras chuvas (início de dezembro), quando a pluviosidade ainda não tinha atingido seu pico.

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“…Biological Sciences Maringá, v. 31, n. 1, p. 65-71, 2009 bióticos, como por exemplo, a abundância sazonal de larvas e adultos, comportamento larval e preferências ambientais; e abióticos, como temperatura, climatologia, estratificação, dentre outros (NORCROSS; SHAW, 1984 , para as larvas de Plagioscion squamosissimus do rio Baía, Mato Grosso do Sul, e por Severi (dados não publicados) para larvas de P. ternetzi na bacia do rio Cuiabá, Mato Grosso.…”

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Abundância e distribuição temporal de larvas de <em>Pachyurus bonariensis</em> Steindachner, 1879 (Perciformes, Sciaenidae), em uma baía do pantanal matogrossense

Santin¹,

Bialetzki²,

Assakawa³

et al. 2009

Acta Sci. Biol. Sci.

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Variação temporal e espacial de ovos e de larvas das espécies de interesse para a pesca na sub-bacia do rio Miranda, Pantanal, Estado do Mato Grosso do Sul, Brasil

Cited by 3 publications

References 1 publication

Influence of nutrient levels, travel time and light availability on phytoplankton chlorophyll-a concentrations in a neotropical river basin

Influence of nutrient levels, travel time and light availability on phytoplankton chlorophyll-a concentrations in a neotropical river basin

Spatial and temporal distribution of fish larvae in marginal lagoons of Pantanal, Mato Grosso State, Brazil

Abundância e distribuição temporal de larvas de <em>Pachyurus bonariensis</em> Steindachner, 1879 (Perciformes, Sciaenidae), em uma baía do pantanal matogrossense

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