Vertical distribution of zooplankton in the water column of Lago Amapá, Rio Branco, Acre, Brazil

Keppeler, Erlei Cassiano; Hardy, Elsa Rodrigues

doi:10.1590/s0101-81752004000200002

Cited by 24 publications

(25 citation statements)

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“…Fish are important predators of zooplankton in floodplain lakes, where the zooplankton community is highly abundant and species-rich, due to the great heterogeneity of habitats created by the seasonal changes in water level (Russo & Hahn, 2006). Keppeler & Hardy (2004) studying the zooplankton of Lake Amapá, noted that there was a greater abundance of Cladocera (species of the genus Moina and Diaphanosoma) predominantly in the low water period, corroborating the results found in this study where T. curtus was also fed by these planktonic Cladocera.…”

Section: Discussionsupporting

confidence: 88%

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Effects of flood regime on the diet of Triportheus curtus (Garman, 1890) in an Amazonian floodplain lake

et al. 2011

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We analyzed the diet of Triportheus curtus in Lake Amapá on the Acre River (AC -Brazil), during three distinct phases of the hydrological cycle (pre-flooding, flooding, and post-flooding stages). The flooding occurred between January and June of 2009. Samples were collected monthly from October 2008 through September 2009. After collection (at 19:00, 01:00, 07:00, and 13:00 hs) and taxonomic identification, fish were eviscerated and their stomachs preserved in a 4% formalin solution for later analysis. The diet was evaluated by the Index of Relative Importance (IRI), and temporal variations (pre-flooding, flooding, and post-flooding) in the diet were summarized by an ordination technique (DCA). The diet of T. curtus was comprised of several orders of insects and microcrustaceans. In the pre-flooding stage, more than 62% of the diet consisted of Ostracoda. In the flooding phase, T. curtus fed mainly on Chaoboridae larvae (Diptera) (44.3%) and terrestrial insects (fragments) (33.7%). In the post-flooding phase, Chaoboridae comprised 80% of the diet. These results indicate that the utilization of food resources by T. curtus was variable, changing with alterations in the availability of resources, as influenced by the hydrological cycle. The population of T. curtus proved to be opportunistic, changing its diet in the course of the hydrological cycle.Neste estudo avaliamos a dieta de Triportheus curtus, no lago Amapá, rio Acre (AC -Brasil), em três períodos distintos do ciclo hidrológico (pré-pulso, pulso e pós-pulso). As coletas foram realizadas mensalmente de outubro de 2008 a setembro de 2009, e o pulso de cheia ocorreu entre janeiro e junho de 2009. Após as despescas (19:00, 01:00, 07:00 e 13:00 hs) e identificação taxonômica, os indivíduos foram eviscerados e os estômagos preservados em formalina 4% para posterior análise. A dieta foi avaliada através do Índice de Importância Relativa (IRI), e as variações temporais (pré-pulso, pulso e pós-pulso) na dieta foram sumarizadas através de uma análise de ordenação (DCA). A dieta de T. curtus foi composta de insetos de diferentes ordens e microcrustáceos. No pré-pulso, aproximadamente 62% da dieta foi composta por Ostracoda. No pulso, T. curtus consumiu principalmente larvas de Chaoboridae (Diptera) (44,3%) e insetos terrestres (fragmentos) (33,7%). No pós-pulso, larvas de Chaoboridae representaram 80% da dieta. Estes resultados indicam que a dieta de T. curtus varia temporalmente, e que a espécie pode ser considerada oportunista, alterando sua dieta de acordo com a abundância dos recursos nas diferentes fases do ciclo hidrológico.

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Section: Discussionsupporting

confidence: 88%

“…It is a typical oxbow lake, approximately 3.1 km long. Its forested shores are inundated during the flood season, with consequent large input of organic matter into the lake (Keppeler & Hardy, 2004). The lake is isolated from the river during the entire dry season, and is connected only during the flood period.…”

Section: Methodsmentioning

confidence: 99%

Effects of flood regime on the diet of Triportheus curtus (Garman, 1890) in an Amazonian floodplain lake

et al. 2011

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“…Segundo POLLARD et al (1998) a turbidez tem um papel mínimo na distribuição e composição das espécies de Rotifera, o que é uma vantagem seletiva destes em relação aos outros grupos zooplanctônicos que coexistem nestas condições. A presença de invertebrados maiores como larvas de Decapoda e Insecta pode refletir um efeito de pressão na comunidade meso e microzooplanctônica mais evidente que a própria predação de peixes (EASTON & GOPHEN, 2003), o que é corroborado por KEPPELLER & HARDY (2004). Aqueles autores enfatizam, por exemplo, que as larvas de Chaoboridae são mais específicas aos Rotifera, podendo controlar suas populações.…”

Section: Discussionunclassified

Efeito das variáveis abióticas e do fitoplâncton sobre a comunidade zooplanctônica em um reservatório do Nordeste brasileiro

Dantas

Almeida

Barbosa

et al. 2009

Iheringia, Sér. Zool.

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ABSTRACT. Abiotic variables and phytoplankton effects on zooplanktonic community from a reservoir in northeast Brazil. Zooplankton from Mundaú reservoir, State of Pernambuco, northeast Brazil was studied concerning temporal (hours and seasonal period) and spatial (pelagic and coastal regions in different depths) variabilities, correlating them to the environmental variables and the phytoplankton. Twenty-three infrageneric and five subgeneric zooplankton taxa were observed. On the whole, Rotifera was the dominant group during this study, especially influenced by the oxygen concentrations. Phytoplankton was dominated by Cyanobacteria. On the dry period, physical variables certainly controlled the zooplankton's development, allowing elevated algal densities. On the rainy period, zooplankton correlation with the system's nutrients levels on pelagic region probably conduced to a resources competition between phytoplankton and zooplankton, controlling algal densities.KEYWORDS. Dynamic, zooplanktonic community, reservoir, northeast Brazil. RESUMO.O zooplâncton do reservatório de Mundaú, Pernambuco, nordeste do Brasil foi estudado quanto a variabilidade temporal (entre os horários e períodos seco chuvoso) e espacial (nas regiões pelágica e litorânea em diferentes profundidades) correlacionando-as com as variáveis ambientais e com o fitoplâncton. Vinte e três táxons infragenéricos e cinco subgenéricos de zooplâncton foram encontrados. De forma geral, Rotifera foi o grupo dominante em todo o estudo. O fitoplâncton foi dominado pelas cianobactérias. No período seco, as variáveis físicas certamente controlaram o desenvolvimento do zooplâncton, favorecendo o estabelecimento de elevadas densidades algais. No período chuvoso, a correlação do zooplâncton com os níveis de nutrientes do sistema na região pelágica provavelmente conduziu a uma competição de recursos entre o fitoplâncton e o zooplâncton, controlando as densidades algais. PALAVRAS-CHAVE.Dinâmica, comunidade zooplanctônica, reservatório, nordeste do Brasil.

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“…Lago Amapá is situated in the municipality of Rio Branco with the geographic coordinates 10°02'36"S and 67°50'24"W (see figure 1 in KEPPELER & HARDY 2004). The lakes are surrounded by forest, which is inundated during high water, and as a consequence, there is a great input of organic matter from the forest into the lake.…”

Section: Methodsmentioning

confidence: 99%

Abundance and composition of Rotifera in an abandoned meander lake (Lago Amapá) in Rio Branco, Acre, Brazil

Keppeler

Hardy

2004

Rev. Bras. Zool.

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The rotifer community in Lago Amapá (abandoned meander lake of the Rio Acre floodplain) was investigated with respect to seasonal changes. Sampling was performed at three collection stations, generally weekly, during the dry season between May 8, 1997 and October 31, 1997, and during the rainy season between January 2, 1998 and February 24, 1998. The density and composition of rotifer species (48 taxons of rotifers) were determined, and their diversity and abundance were observed to be greater, respectively, at high-water and low-water. Anova was performed, by means of the F test, to test for seasonal differences in environmental variables and rotifers, showing that there was a highly statistically significant difference for pH and transparency (p < 0.01). Pearson's correlation was used to show that rotifer numbers during the low-water phase correlated negatively with electrical conductivity (r = -0.8824, p < 0.05) and during the high-water phase correlated negatively with depth (r = -0.7513, p < 0.05). Seasonal changes, caused by an increase in water levels and the low diversification of niches, influenced the composition and abundance of the animal group studied.
A comunidade de rotíferos do Lago Amapá (meandro abandonado da planície de inundação do Rio Acre) foi investigada sazonalmente. As amostragens foram realizadas semanalmente em três estações de coletas, em dois períodos: estação seca entre 08/V/1997 e 31/X/1997 e estação chuvosa, entre 02/I/1998 e 24/II/1998. A densidade e composição de rotíferos (48 táxons de rotíferos) foram determinadas. A diversidade e abundância foram caracterizadas por serem maiores, respectivamente, nas águas altas e águas baixas. Anova e teste F foram usados, visando observar diferenças sazonais nas variáveis ambientais e rotíferos. Transparência e pH foram estatisticamente altamente significativos (p < 0,01). As análises de correlações de Pearson revelaram que a condutividade elétrica foi negativamente correlacionada com a densidade de rotíferos (r = -0,8824; p < 0,05), na fase de águas baixas, bem como, profundidade, na fase de águas altas (r = -0,7513; p < 0,05). Mudanças sazonais, causadas pelas flutuações do nível da água, e baixa diversificação dos nichos influenciaram a composição e abundância do grupo estudado

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Vertical distribution of zooplankton in the water column of Lago Amapá, Rio Branco, Acre, Brazil

Cited by 24 publications

References 7 publications

Effects of flood regime on the diet of Triportheus curtus (Garman, 1890) in an Amazonian floodplain lake

Effects of flood regime on the diet of Triportheus curtus (Garman, 1890) in an Amazonian floodplain lake

Efeito das variáveis abióticas e do fitoplâncton sobre a comunidade zooplanctônica em um reservatório do Nordeste brasileiro

Abundance and composition of Rotifera in an abandoned meander lake (Lago Amapá) in Rio Branco, Acre, Brazil

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