Phytoplankton assemblages in lateral lagoons of a large tropical reservoir

Ferrareze, Mateus; Mg, Nogueira

doi:10.1590/s1519-69842013000100017

Cited by 4 publications

(2 citation statements)

References 26 publications

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“…This pattern has been observed for the entire reservoir cascade [42], including both storage and run-of-river reservoirs [58,59]. Even in lateral lagoons where phytoplankton development is favored, the chlorophyll values remain between 2 and 3 µg·L −1 [60]. Under these conditions, we assume that phytoplankton does not significantly alter the relationship between SPM and reflectance.…”

Section: Discussionsupporting

confidence: 55%

Indirect Assessment of Sedimentation in Hydropower Dams Using MODIS Remote Sensing Images

et al. 2019

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In this study, we used moderate resolution imaging spectroradiometer (MODIS) satellite images to quantify the sedimentation processes in a cascade of six hydropower dams along a 700-km transect in the Paranapanema River in Brazil. Turbidity field measurement acquired over 10 years were used to calibrate a turbidity retrieval algorithm based on MODIS surface reflectance products. An independent field dataset was used to validate the remote sensing estimates showing fine accuracy (RMSE of 9.5 NTU, r = 0.75, N = 138). By processing 13 years of MODIS images since 2000, we showed that satellite data can provide robust turbidity monitoring over the entire transect and can identify extreme sediment discharge events occurring on daily to annual scales. We retrieved the decrease in the water turbidity as a function of distance within each reservoir that is related to sedimentation processes. The remote sensing-retrieved turbidity decrease within the reservoirs ranged from 2 to 62% making possible to infer the reservoir type and operation (storage versus run-of-river reservoirs). The reduction in turbidity assessed from space presented a good relationship with conventional sediment trapping efficiency calculations, demonstrating the potential use of this technology for monitoring the intensity of sedimentation processes within reservoirs and at large scale.

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Section: Discussionsupporting

confidence: 55%

Indirect Assessment of Sedimentation in Hydropower Dams Using MODIS Remote Sensing Images

et al. 2019

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“…The focus of this work is to reinforce the evidences that lateral lagoons of the Rosana Reservoir are distinct limnological environments, which add structural and functional complexity to the reservoir channel and contribute to support diverse biotic communities, as previously demonstrated for fish (FERRAREZE; NOGUEIRA, 2011a), zooplankton (FERRAREZE; NOGUEIRA, 2011b) and phytoplankton NOGUEIRA, 2013). The results of the investigation can subsidize the improvement of the management capacity of the reservoir, especially in terms of conservation and multiple uses.…”

Section: Introductionmentioning

confidence: 61%

<b>Limnology of a lateral lagoon system connected to a Neotropical reservoir (Rosana reservoir, São Paulo/Paraná, Brazil)

Ferrareze¹,

Nogueira²,

Sartori³

2014

Acta Sci. Biol. Sci.

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The aim of this work was to perform a comparative analysis of four lateral lagoons and of the main channel of the Rosana Reservoir (Paranapanema river), southeast Brazil. The fieldwork was conducted during dry and rainy periods of 2004 and 2005. The analyzed variables were chlorophyll a, turbidity, total phosphorus, total nitrogen, dissolved nutrients (ammonium, nitrate, nitrite, phosphate and silicate), Secchi disk transparency, suspended solids, temperature, pH, dissolved oxygen and electrical conductivity. Intense summer rainfall provided a high input of allochthonous material into the system, resulting in conspicuous changes-high turbidity and nutrient concentrations and low transparency, especially in the reservoir channel. The cluster analysis showed a clear segregation between the reservoir sampling site and the lagoons. The results evidenced the strong influence of regional factors on the limnological structure and functioning of these environments. The alternation between dry and rainy periods changes significantly the characteristics of the main channel and lagoons, mainly due to the contribution of tributaries. Spatially, the system exhibited a remarkable limnological variability. This shows the need to consider these distinct habitats in regional conservation strategy, presently focused on terrestrial habitats.

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Differences in ichthyofauna feeding habits among lateral lagoons and the river channel in a large reservoir

2015

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In this study, we investigated differences in feeding habits of small-sized ichthyofauna among lateral lagoons and the river channel in a large reservoir. The study was performed in four lagoons and in one sampling site of the main channel in Rosana Reservoir, Paranapanema River, Brazil. The samples were taken in September and November of 2004 and in January, March, May, and August of 2005. Fish were sampled with a 7.5 m 2 hand net. Five manual throws were made toward aquatic macrophytes stands. The sampling design favored the collection of small-sized fish fauna (juveniles/small-sized species). The stomach contents of 42 species were analyzed. A total of 183 different items were consumed by fish. These items were grouped in 11 food categories, which were used to classify fish into seven trophic guilds. Aquatic insects were consumed by 32 species and were the predominant feeding item. In the river, the most consumed items were aquatic insects, cladocerans, and phytoplankton, whereas in the lagoons aquatic insects, copepods, and cladocerans were the main items. By comparing each trophic guild, the number of insectivores, algivores, and zooplanktivores species was higher in the lagoons than in the river, and the opposite was found only for omnivore fish. Low niche width in all sites indicates high trophic specialization and low niche overlap between pairs of species. Fish assemblage in the lateral lagoons presents feeding habits distinct from those of the river species, indicating that the coexistence and high abundance of small-sized fish in the sampling sites are explained by their high feeding adaptability, which includes a tendency toward dietary specialization, low feeding overlap, and resource partitioning, along with different temporal resource uses.Keywords: Paranapanema River, small fish, trophic guilds, diet, feeding pattern.As diferenças nos hábitos alimentares da ictiofauna entre lagoas laterais e o canal do rio em um grande reservatório , junto aos bancos de macrófitas aquáticas. O desenho amostral favoreceu a coleta de peixes juvenis e espécies de pequeno porte. Os conteúdos estomacais de 42 espécies foram analisados. Um total de 183 diferentes itens foi consumido, que foram agrupados em 11 categorias alimentares. Sete guildas tróficas foram estabelecidas. Insetos aquáticos foram consumidos por 32 espécies de peixes, sendo o item alimentar predominante. O padrão alimentar da ictiofauna no rio foi diferente quando comparado as lagoas, como demonstrado na Análise de Correspondência Destendenciada. No rio, os principais itens alimentares foram insetos aquáticos, cladóceros e fitoplâncton, enquanto que nas lagoas os principais itens foram insetos aquáticos, copépodes e cladóceros. Comparando-se cada guilda trófica, o número de espécies de insetívoros, algívoros e zooplanctívoros foi maior nas lagoas do que no rio e o oposto foi encontrado somente para os onívoros. Foram registrados baixos valores de amplitude de nicho, indicando que as espécies apresentam alta especialização trófica, e baixa sobr...

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Phytoplankton assemblages in lateral lagoons of a large tropical reservoir

Cited by 4 publications

References 26 publications

Indirect Assessment of Sedimentation in Hydropower Dams Using MODIS Remote Sensing Images

Indirect Assessment of Sedimentation in Hydropower Dams Using MODIS Remote Sensing Images

<b>Limnology of a lateral lagoon system connected to a Neotropical reservoir (Rosana reservoir, São Paulo/Paraná, Brazil)

Differences in ichthyofauna feeding habits among lateral lagoons and the river channel in a large reservoir

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