Spatial and temporal patterns of ciliate species composition (Protozoa: Ciliophora) in the plankton of the Upper Paraná River floodplain

Pauleto, Gustavo Mayer; Velho, Luiz Felipe Machado; Buosi, P. R. B; Brão, Arianne Francielle Silva; Lansac‐Tôha, Fábio Amodêo; Bonecker, Cláudia Cósta

doi:10.1590/s1519-69842009000300007

Cited by 29 publications

(30 citation statements)

References 26 publications

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“…Previous samplings performed by Pauleto et al (2009) in the Guaraná Lake found only 36 ciliate species, however, their sampling design was different: one sample was taken during the high water and one during the low water period. Meanwhile, in our study, in which samplings were performed monthly during a whole year at this same lake, 112 ciliate species were found.…”

Section: Discussionmentioning

confidence: 99%

“…In fact, the flood pulse is recognized as the main factor structuring aquatic communities (Junk et al, 1989;Neiff, 1990), and was also found to be the major factor influencing the ciliate community in the Upper Paraná River floodplain lakes (Pauleto et al, 2009).…”

Section: Discussionmentioning

confidence: 99%

“…However, as opposed to temperate regions, where temperature is the main factor structuring ciliate communities (Graham et al, 2004;Müller et al, 1991), in floodplain habitats of tropical regions the hydrological regime constitutes the major force influencing those protists (Pauleto et al, 2009). This temporal alteration of the hydrological regime provides the occurrence of species that are adapted to this condition, which is facilitated by mechanisms to persist in the environment during unfavorable periods (Lytle & Poff, 2004).…”

Section: Introductionmentioning

confidence: 99%

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Intra-annual variation in planktonic ciliate species composition (Protista: Ciliophora) in different strata in a shallow floodplain lake

et al. 2017

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Cite as: Pauleto, G.M. et al. Intra-annual variation in planktonic ciliate species composition (Protista: Ciliophora) in different strata in a shallow floodplain lake. Acta Limnologica Brasiliensia, 2017, vol. 29, e107. Abstract: Aim: We aimed to evaluate the variation in planktonic ciliate species composition in different strata of the Guaraná Lake, encompassing high and low water periods, at the Upper Paraná River floodplain. Methods: Samplings were collected monthly between March 2007 and February 2008, from the epilimnion, metalimnion and hypolimnion. Ciliates samples were filtered using a plankton net of 10µm mesh size and identified in vivo under an optical microscope. Results: Among 112 species identified, 13 were found exclusively during the high water periods and 39 during the low water period. Results of nonparametric extrapolation indices evidenced that the observed richness represented between 70% and 90% of the estimated richness. Regarding the variation in species composition, Beta1 index showed that the alteration in composition between strata during the low water period was slightly greater than that registered during high waters. Cluster analysis evidenced a higher dissimilarity in ciliate species composition between periods than among the different strata. The greatest variation in species composition was verified during the distinct hydrological periods, whereas no significant differences were observed for the different strata analysed. Conclusions: We found that in the pelagic compartment, ciliate species composition changed significantly between hydrological periods, and a higher similarity in species composition among strata was observed during the high water period. Therefore, alterations in the vertical distribution seem to be related to the homogenizing effect of the floods in the water column stability.Keywords: protist; plankton; species richness; diversity; freshwater.Resumo: Objetivo: Avaliou-se a variação na composição de espécies de ciliados, em diferentes estratos na lagoa do Guaraná, englobando períodos de águas altas e baixas, na planície de inundação do alto Rio Paraná. Métodos: As amostragens foram realizadas mensalmente entre março de 2007 e fevereiro de 2008, em três diferentes profundidades: epilimínio, metalimínio e hipolimínio. Depois de concentradas as amostras em rede de plâncton (10µm), os organismos foram identificados in vivo 2 Pauleto, G.M. et al.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Intra-annual variation in planktonic ciliate species composition (Protista: Ciliophora) in different strata in a shallow floodplain lake

et al. 2017

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“…The section of this river between Porto Primavera and Itaipu reservoirs is the last dam-free in Brazilian territory. Therein, the flood regime is the main structuring force on aquatic communities in these environments, despite of the influence from the twenty-six reservoirs upstream (BORGES; TRAIN, 2009;PAULETO et al, 2009;LUZ-AGOSTINHO et al, 2009). Seasonal disturbances along with high environmental heterogeneity promotes high diversity of species, and this area is considered essential for the maintenance of populations already eliminated by the regulation of reservoirs in other parts of the river (AGOSTINHO et al, 2005).…”

Section: Acta Scientiarum Biological Sciencesmentioning

confidence: 99%

<b>Rotifer community structure along a stretch under the influence of dams in the Upper Paraná River floodplain

Mantovano

Arrieira

Schwind

et al. 2015

Acta Sci. Biol. Sci.

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ABSTRACT. The construction of reservoirs imposes substantial impact on freshwater ecosystems and changes the ecological aspects of the lotic system downstream of dams. We hypothesized an increasing dissimilarity between communities in the sampling sites according to increasing distance from the Porto Primavera Dam. In addition, we expect that the rotifer community in the last sampling site will be influenced more by environmental variables related to trophic status. Samplings were conducted under the water surface of ten sites on the Paraná River in August 2013. Environmental variables were also determined. The highest number of taxa belonged to families Brachionidae, Lecanidae and Trichocercidae. The most abundant species was observed to Synchaeta oblonga, Keratella cochlearis, Brachionus calyciflorus. The species dissimilarity between sampling sites, tested using the Sorensen index, showed high dissimilarity between sampling sites. Redundancy analysis indicated a significant relationship between environmental variables (total phosphorus and ammonia) and abundance of Brachionus calyciflorus and Keratella cochlearis, in the last sampling site. Our results suggest a greater dissimilarity between the rotifer communities according to increasing distance from the Porto Primavera Dam. In addition, a higher influence of the environmental variables related to trophic conditions was observed in the last sampling site, and influenced indirectly the occurrence and abundance of some rotifer species, due to increased availability of food resources, confirming the predicted hypothesis.Keywords: rotifer, trophic status, composition, longitudinal distribution.Estrutura da comunidade de rotíferos ao longo de um trecho sob a influência de barragens na planície de inundação do alto rio Paraná RESUMO. A construção de reservatórios impõe considerável impacto sobre os ecossistemas de água doce e altera os aspectos ecológicos do sistema lótico a jusante das barragens. A hipótese foi que ocorrerá maior dissimilaridade entre as comunidades nos pontos amostrados à medida que se afastam da barragem de Porto Primavera. Espera-se, ainda, que a comunidade de rotíferos do último ponto de amostragem seja mais influenciada pelas variáveis ambientais relacionadas à trofia. As amostragens foram realizadas à subsuperfície da região pelágica em dez pontos no rio Paraná no mês de agosto de 2013. As espécies mais abundantes foram Synchaeta oblonga, Keratella cochlearis, Brachionus calyciflorus. As variáveis ambientais também foram determinadas. O maior número de táxons registrados pertenceu às famílias Brachionidae, Lecanidae e Trichocercidae. A similaridade da composição de espécies calculada de acordo com o índice de Sorensen registrou elevada dissimilaridade entre os pontos amostrados. A análise de redundância constatou a relação significativa entre as variáveis ambientais (fósforo total e amônia) e a abundância de Brachionus calyciflorus e Keratella cochlearis, no último ponto de amostragem. Nossos resultados sugerem que ocorreu maior dissimilar...

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“…The Ivinheima subsystem is formed by the Ivinheima River and associated floodplain lakes (Pauleto et al, 2009). It has heterogeneous vegetation on its margins, ranging from herbaceous vegetation to the formation of extensive areas of riparian forests at different regeneration stages .…”

Section: Introductionmentioning

confidence: 99%

Chironomidae (Diptera) community structure in two subsystems with different states of conservation in a floodplain of southern Brazil

Rosin¹,

Mangarotti²,

Takeda³

2010

Acta

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Estrutura da comunidade de Chironomidae (Diptera) em dois subsistemas em diferentes estados de conservação de uma planície de inundação do sul do Brasil Abstract: Aim: Our study aimed to compare the composition, distribution, diversity, abundance and dominance of Chironomidae in two subsystems of the Upper Paraná River floodplain, with different levels of conservation. We expected to find the highest values of diversity and lowest dominance of taxa in the most conserved areas (Ivinhema subsystem). We also expected to detect differences in the composition and distribution of communities between the subsystems, because of the level of conservation of each subsystem; Methods: Sampling was performed in March and September 2003, in eight stations, four in the Paraná River subsystem and four in the Ivinhema River subsystem. Four samples were taken at each point with a modified Petersen-type sampler: three for biological analysis and one for sedimentological analysis. Chironomidae larvae were identified to generic level; Results: Twenty-nine genera belonging to three subfamilies (Tanypodinae, Chironominae and Orthocladiinae) were recorded in this study. Chironomus, Dicrotendipes, Goeldichironomus, and Tanypus were the main genera found in the Paraná subsystem. Polypedilum was the only genus present in all sampling stations, and was dominant in five of them. In the Paraná subsystem we observed the highest values of dominance, and in the Ivinhema subsystem the largest number of rare taxa; Conclusions: Results showed differences in the structure of the Chironomidae community between the Paraná and Ivinhema subsystems. The community of Chironomidae in the Paraná subsystem was composed predominantly by generalist and tolerant genera. In the Ivinhema subsystem we observed higher richness of taxa. The greatest diversity, lowest values of dominance and exclusive taxonomic composition in the Ivinhema River subsystem could be reflecting a less degraded environment, demonstrating that the conservation of these areas is essential for maintaining the diversity of Chironomidae.Keywords: Chironomidae larvae, anthropic influences, diversity, Paraná River, Ivinhema River.Resumo: Objetivo: Esse estudo teve por objetivo comparar a composição taxonômica, distribuição, diversidade, abundância e dominância da comunidade de Chironomidae em dois subsistemas da Planície de inundação do alto rio Paraná em diferentes estados de conservação. Esperava-se encontrar maiores valores de diversidade e menor dominância de táxons nas áreas mais conservadas (subsistema Ivinhema). Esperava-se também, diferenças na composição e na distribuição da comunidade entre os subsistemas devido a aos diferentes estados de conservação de cada estação; Métodos: As coletas foram realizadas em março e setembro de 2003 em oito ambientes, quatro no subsistema Paraná e quatro no subsistema Ivinhema. Em cada ponto foram coletadas quatro unidades amostrais por período com um pegador do tipo Petersen modificado: três para análise biológica e uma para análise sedimentológica.

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Spatial and temporal patterns of ciliate species composition (Protozoa: Ciliophora) in the plankton of the Upper Paraná River floodplain

Cited by 29 publications

References 26 publications

Intra-annual variation in planktonic ciliate species composition (Protista: Ciliophora) in different strata in a shallow floodplain lake

Intra-annual variation in planktonic ciliate species composition (Protista: Ciliophora) in different strata in a shallow floodplain lake

<b>Rotifer community structure along a stretch under the influence of dams in the Upper Paraná River floodplain

Chironomidae (Diptera) community structure in two subsystems with different states of conservation in a floodplain of southern Brazil

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