Relationships between environmental conditions and the morphological variability of planktonic testate amoeba in four neotropical floodplains

Arrieira, Rodrigo Leite; Schwind, Leilane Talita Fatoreto; Joko, Ciro Yoshio; Alves, Geziele Mucio; Velho, Luiz Felipe Machado; Lansac‐Tôha, Fábio Amodêo

doi:10.1016/j.ejop.2016.08.006

Cited by 17 publications

(10 citation statements)

References 26 publications

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“…Families Arcellidae and Difflugiidae showed the greatest number of taxa. The same pattern was also observed in several studies performed in the floodplain lakes of Pantanal, Araguaia, Amazon and Paraná, and also in São Paulo state (Lansac-Tôha et al, 2008;Lima, Loverde-Oliveira, Silva, & Oliveira, 2012;Arrieira et al, 2016b). The results observed for species richness were superior to that of other microbial taxa traditionally studied in this lake, such as the rotifer community (14 taxa) (Soares, Tundisi, & Matsumura-Tundisi, 2011), cladocerans and copepods, showing low representativeness with only three and one taxa, respectively (Meschiatti & Arcifa, 2002).…”

Section: Discussionsupporting

confidence: 81%

“…Regarding the lake compartments, in the littoral region we found all taxa registered in the study, whereas in the limnetic region 11 taxa were registered. The limnetic region show limitations to the permanence of certain testate amoebae taxa, for example the higher flow velocity, in which only adapted taxa can remain at the plankton for a long period of time, such as those presenting gas vacuoles (Velho, Lansac-Tôha, & Bini, 2003;Arrieira et al, 2016b). The littoral region is usually structured by grass and aquatic macrophytes, providing a higher complexity and environmental heterogeneity to this biotope, increasing the number of ecological niches available (Landa & Mourgués-Schurter, 2000), and consequently favouring a higher species richness of testate amoebae.…”

Section: Discussionmentioning

confidence: 99%

“…Moreover, testate amoebae are sensitive to environmental changes, and for this reason, may be considered environmental bioindicators (Schwind, Arrieira, Simões, Bonecker, & Lansac-Tôha, 2017). Therefore, the accurate taxonomic identification of those organisms may provide information on its biology, and consequently, help understand ecological processes and define their ecological functions in aquatic ecosystems (Arrieira et al, 2016a).…”

Section: Introductionmentioning

confidence: 99%

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<b>Species composition of testate amoebae in Lake Monte Alegre, Ribeirão Preto, SP, Brazil

Mousinho

Silva

Arrieira

et al. 2018

Acta Sci. Biol. Sci.

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We aimed to perform the first survey of testate amoebae community composition in Lake Monte Alegre at São Paulo state, and contribute to mitigate the taxonomic impediment regarding the diversity of testate amoebae in Brazil. Samplings were performed in 20 sampling sites within the lake, in the limnetic and littoral regions in April 2015, using a 58 μm-meshplankton net. We identified 20 taxa of testate amoebae belonging to four families: Arcellidae (8 taxa), Centropyxidae (4 taxa), Difflugiidae (7 taxa) and Lesquereusiidae (2 taxa). The littoral region showed the highest number of taxa (n = 20), whereas in the limnetic region 11 taxa were registered. Therefore, our results evidenced the importance of testate amoebae in aquatic systems, and that further research, taxonomic and/or ecological, in those environments should include these organisms in their investigation. Moreover, we suggest that future research with greater sampling effort is necessary to expand the identification of possible cryptic species in this environment.Composição de amebas testáceas no lago Monte Alegre, Ribeirão Preto, SP, Brasil RESUMO. O objetivo deste estudo foi realizar o primeiro levantamento da composição da comunidade de amebas testáceas no lago Monte Alegre no Estado de São Paulo e, assim, contribuir para mitigar o impedimento taxonômico relacionado à diversidade de amebas testáceas no Brasil. As amostragens foram realizadas em 20 pontos do lago, nas regiões limnética e litorânea, no mês de abril de 2015, com rede de plâncton de 58 μm de abertura de malha. Foram identificados 20 táxons de amebas testáceas, divididos em quatro famílias: Arcellidae (8 táxons), Centropyxidae (4 táxons), Difflugiidae (7 táxons) e Lesquereusiidae (2 táxons). A região litorânea apresentou o maior número de táxons (n = 20), enquanto que na região limnética foram registrados 11 táxons. Diante disso, é possível indicar que os nossos resultados evidenciam a importância das amebas testáceas nos sistemas aquáticos e que novos estudos, taxonômicos e/ou ecológicos, nesses ambientes devem incluir estes organismos em suas investigações. Além disso, sugeremse futuros estudos com maior esforço amostral para ampliar a identificação de possíveis espécies crípticas no ambiente.Palavras-chave: protozoa; riqueza de espécies; zooplâncton; taxonomia.

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Section: Discussionsupporting

confidence: 81%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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<b>Species composition of testate amoebae in Lake Monte Alegre, Ribeirão Preto, SP, Brazil

Mousinho

Silva

Arrieira

et al. 2018

Acta Sci. Biol. Sci.

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“…A drop in temperature during the winter possibly resulted in decreased metabolic rates of zooplankton and consequent low feeding rates in contrast to spring. Temperature is an environmental factor likely to significantly influence the growth, reproduction and succession of planktonic organisms (Loiterton et al, 2004;Arrieira et al, 2015;Arrieira et al, 2016). The low temperatures measured in winter could limit the growth of aquatic organisms, such as testate amoebae and their food, resulting in less abundance possibly due to temperature variability.…”

Section: Discussionmentioning

confidence: 99%

Structure and ecological aspects of zooplankton (Testate amoebae, Rotifera, Cladocera and Copepoda) in highland streams in southern Brazil

2019

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Aim: This study aimed to characterize the zooplankton structure in highland streams in southern Brazil, Pelotas River sub-basin, as well as the respective relationships with the environmental conditions in the different seasons. Methods Zooplankton was collected using a plankton net (68 µm mesh) and concentrated into a volume of 50 ml for later analysis in the laboratory. Sampling occurred during the winter (August 2013), spring (November 2013), summer (February 2014) and autumn (May 2014). Results Rotifers and testate amoebae were the predominant groups. Mean abundance, diversity and evenness varied considerably between the different seasons. The variability of zooplankton was correlated to environmental conditions (conductivity, suspended solids, pH, temperature and dissolved oxygen). Conclusions The seasonal variation of the zooplankton community made it possible to elucidate some questions involving the ecology of these organisms in highland streams in southern Brazil. These unique ecosystems warrant further research and monitoring efforts, including studies of their hydrological patterns, biological diversity and adaptive mechanisms of the zooplankton community.

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“…All these interact in complex ways with other planktic components or suspended organic matter (Suthers, 2009). These organisms depend on the environmental conditions in the lake, which are influenced by different factors, including seasonal weather variations, and other influencing factors such as long-term climate variations (Arrieiraa et al, 2016;Zehrer, Burns, & Flöder, 2014). Such variations occur mainly as changes in the composition of the planktic assemblage, either through changes in species composition, or through changes in the relative abundance of the dominant groups.…”

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confidence: 99%

Plankton variation in Río Cuarto Lake, Costa Rica (2013-2017)

Umaña‐Villalobos¹

2019

RBT

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Lake Rio Cuarto is a meromictic maar lake located in the low plains of northern Costa Rica. Its plankton composition has been studied several times since the decade of 1970. Yet most studies made short term surveys, and at least one study lasted for one year. Here we present data on phytoplankton and zooplankton composition from a four year study of the lake, from 2013 to 2017. Phytoplankton was studied from subsurface samples, preserved in Lugol’s solution and zooplankton from 20 m vertical hawls of a 64 um mesh net, and preserved with formaline and later transferred to 95% etanol. Phytoplankton composition included 54 taxa, most of them from the were Chlorophyta, followed by Cyanobacteria and Bacillariophyta. The most abundant were Synechococcus spp., Aphanocapsa sp. Coenochloris fotii, Chlorella sp. and Discostella stelligera. Total phytoplankton decreased from 2013 to 2017, mainly due to a decrease in Cyanobacteria. Zooplankton comprised 14 taxa, 5 cladocerans, 4 copepods, 1 diptera and 4 rotifers. The most abundant were Keratella cochlearis, Brachionus falcatus, Eubosmina tubicen and Arctodiaptomus dorsalis. There was a substitution of dominant species through time, at first (2013-2014) K. cochlearis and E. tubicen alternated in dominance, and later (2015-2016), A. dorsalis, Diaphanosoma sp. and Ceridaphnia sp. became dominant, with a return of K. cochlearis by 2017. The relationship between both components of the plankton is a complex result of the responses of individual species of both microalgae and zooplankton. However, most zooplankton taxa should be regarded as omnivores, so those relationships are not direct causal effects. The changes that occurred during the time of the study seem to be related to changes in the conditions of the lake, since its thermocline deepened with time and became more transparent. Those changes were not cyclical on an annual basis, but seemed to occur more on a long-term basis, as has been recognized earlier in the literature about tropical lakes.

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Relationships between environmental conditions and the morphological variability of planktonic testate amoeba in four neotropical floodplains

Cited by 17 publications

References 26 publications

<b>Species composition of testate amoebae in Lake Monte Alegre, Ribeirão Preto, SP, Brazil

<b>Species composition of testate amoebae in Lake Monte Alegre, Ribeirão Preto, SP, Brazil

Structure and ecological aspects of zooplankton (Testate amoebae, Rotifera, Cladocera and Copepoda) in highland streams in southern Brazil

Plankton variation in Río Cuarto Lake, Costa Rica (2013-2017)

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