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  1. Article ; Online: Influence of the chlorophyll-a gradient on the community structure of plankton microcrustaceans (Cladocera and Copepoda) in a Neotropical reservoir

    VANESSA G. TIBÚRCIO / TATIANE MANTOVANO / JOÃO V.F. DA SILVA / CLAUDIA C. BONECKER

    Anais da Academia Brasileira de Ciências, Vol 93, Iss

    2021  Volume 2

    Abstract: Abstract Fish farming in net cages is considered as an alternative to food production in response to elevated population growth, and zooplankton is an important resource to the development of this economic activity. We (i) compared microcrustacean ... ...

    Abstract Abstract Fish farming in net cages is considered as an alternative to food production in response to elevated population growth, and zooplankton is an important resource to the development of this economic activity. We (i) compared microcrustacean composition in eutrophic and oligotrophic habitats under net tank influence, (ii) investigated changes in species distributions in these habitats, and (iii) indicated which chlorophyll-a concentrations presented thresholds that alter community structure. We expected different responses of species to changes in chlorophyll-a concentration due to net cage management, as chlorophyll-a represents an estimate of food availability. Microcrustacean samplings and chlorophyll-a estimation were made upstream, downstream and close to the net cages, during 120 days, in the Rosana Reservoir (Brazil). Species composition differed significantly (p<0.05) among habitats where in the eutrophic environment was found the largest number of species. However, only in the eutrophic habitats did frequency of occurrence and relative abundance of some species change with chlorophyll-a variation. Thus, net cage management influenced species distribution only in the most productive habitat. These responses can affect ecosystem processes related to trophic dynamics as secondary productivity and nutrient cycling.
    Keywords zooplankton ; primary productivity ; trophy reservoir ; anthropic activity ; Science ; Q
    Subject code 590
    Language English
    Publishing date 2021-07-01T00:00:00Z
    Publisher Academia Brasileira de Ciências
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article ; Online: Do changes in the water regime determine the abundance of the copepod trophic group in a Neotropical floodplain?

    Lenin Medeiros de Almeida Lino / Tatiane Mantovano / Vanessa G. Tibúrcio / Fábio Amodêo Lansac-Tôha

    Acta Limnologica Brasiliensia, Vol

    2021  Volume 33

    Abstract: Abstract Aim Our study evaluated the effects of extreme weather events and environmental conditions on the trophic groups of copepods (herbivores and omnivores) in the upper Paraná River floodplain. Methods The zooplankton were collected and Copepods and ...

    Abstract Abstract Aim Our study evaluated the effects of extreme weather events and environmental conditions on the trophic groups of copepods (herbivores and omnivores) in the upper Paraná River floodplain. Methods The zooplankton were collected and Copepods and Rotifers were analyzed in nine environments of the upper Paraná River floodplain during 2000 and 2010, during which time the La Niña (drought) and El Niño (flood) climatic events occurred, respectively. Results The results suggest that in periods of extreme drought productivity-related variables act as determining forces on abundance of copepod trophic groups due to the contraction of aquatic ecosystems. Although the abundance of trophic groups is associated with system productivity, the responses between them differ, since herbivore abundance was associated with chlorophyll-a and total phosphorus and omnivores with rotifer abundance. In extreme flood (El Niño), no significant relationship was found between environmental variables and any trophic group. Conclusions In general, it is believed that in periods of extreme drought the variables associated with productivity act as determining forces on the abundance of trophic groups of copepods due to the contraction of aquatic ecosystems. According to the results found, it is suggested that other works be carried out with a greater number of extreme events to corroborate our results and, and also to extrapolate to other aquatic communities.
    Keywords climate events ; microcrustaceans ; trophic guilds ; floodplain ; Ecology ; QH540-549.5
    Subject code 550 ; 333
    Language English
    Publishing date 2021-05-01T00:00:00Z
    Publisher Associação Brasileira de Limnologia
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article ; Online: Toxic tests show the sensitivity of the Daphnia similis (Crustacea, Cladocera) and Pseudokirchneriella subcapitata (Chlorophyceae) to commercial pesticides

    ADELINA M. KÜHL / EVALDO L.G. ESPÍNDOLA / TATIANE MANTOVANO / SABRINA DEOSTI / FÁBIO A. LANSAC-TÔHA

    Anais da Academia Brasileira de Ciências, Vol 94, Iss

    2022  Volume 4

    Abstract: Abstract Pesticides have reached aquatic ecosystems and have caused numerous impacts on organisms. The present study aimed to assess the sensitivity of Daphnia similis Straus 1820 and Pseudokirchneriella subcapitata (Korshikov) F.Hindák to three ... ...

    Abstract Abstract Pesticides have reached aquatic ecosystems and have caused numerous impacts on organisms. The present study aimed to assess the sensitivity of Daphnia similis Straus 1820 and Pseudokirchneriella subcapitata (Korshikov) F.Hindák to three commercial pesticides with different active ingredients: Siptran 500SC® (atrazine), Dimilin® (diflubenzuron), and Aproach Prima® (picoxystrobin + cyproconazole). For this purpose, we performed acute toxicity tests on these organisms. The compound most toxic to D. similis was the insecticide Dimilin® (toxic up to 5 μg/L of the active ingredient), followed by the fungicide Aproach Prima® (48h-EC50: 47.33 μg of the active ingredients/L) and the herbicide Siptran 500SC® (48h-EC50: 534.69 mg of the active ingredient/L). In contrast, Siptran 500SC® was the most toxic compound (96h-IC50: 52.61 μg/L) to P. subcapitata, followed by Aproach Prima® (96h-IC50: 164.73 μg/L) and Dimilin® (non-toxic up to 1 g/L). The toxicity of the fungicide to algae and microcrustaceans demonstrates that compounds developed for certain organisms are able to affect others, indicating the relevance of conducting ecotoxicological tests on different organisms.
    Keywords Commercial formulations ; pesticides ; microcrustaceans ; phytoplankton algae ; Science ; Q
    Language English
    Publishing date 2022-11-01T00:00:00Z
    Publisher Academia Brasileira de Ciências
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  4. Article ; Online: Post-larval Colossoma macropomum (Characiformes, Serrasalmidae) show better performance in excavated than concrete tanks under different feeding strategies

    Julliana de Castro Lima / Fábio Amodêo Lansac-Tôha / Tatiane Mantovano / Natanael José da Silva / Moacyr Serafim Junior

    Acta Scientiarum : Biological Sciences, Vol 43, Iss

    2021  Volume 1

    Abstract: As the global human population increases, the demand for food grows and, consequently, practices such as aquaculture have become more common. Colossoma macropomum (Cuvier, 1818) is a native Amazonian species, considered to be the second most cultivated ... ...

    Abstract As the global human population increases, the demand for food grows and, consequently, practices such as aquaculture have become more common. Colossoma macropomum (Cuvier, 1818) is a native Amazonian species, considered to be the second most cultivated fish in the country. We compared the development of post-larval C. macropomum of different ages, submitted to combinations of food management on a commercial production scale. Two experiments tested the delivery of i) 55% crude protein feeding, ii) natural feeding by fertilizing the water and iii) a combination of both during hatchery in concrete tanks (10 m 2) or excavated soil-bottom tanks (4502) subjected to distinct fertilization protocols and storage densities. The weight and length of the post-larvae grown in ponds were greater (p < 2.0x10-16) for the mixed treatment, except during the first week of larvae, in which values were similar (p ≤ 1.76x10-14) to the fertilization treatment. Concrete tanks with fertilization management without feeding were similar to the mixed treatment (p ≤ 1.38x10-7); however, during the first week of external larvae production, the growth performance under fertilization treatment was superior to the others. Food management in excavated tanks, when compared to the same management performed in concrete tanks, registered higher averages for the productive variables of C. macropomum cultivated at the density of 200 post-larvae m-2 in all evaluated food strategies. It was verified that post-larvae of C. macropomum did not develop well in the first weeks of life when receiving only formulated diets. The increase in natural food availability through fertilization positively influenced the performance of the species, which can remain without feeding until the second week of life.
    Keywords larviculture ; fish farming ; tambaqui ; diet ; fertilization ; Biology (General) ; QH301-705.5 ; Microbiology ; QR1-502
    Subject code 590
    Language English
    Publishing date 2021-03-01T00:00:00Z
    Publisher Universidade Estadual de Maringá
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  5. Article ; Online: Occurrence of Arcellidae (Amorphea, Arcellinida) in a coastal stream in the State of Rio de Janeiro

    Viviane Bernardes dos Santos Miranda / Tatiane Mantovano / Yemna Gomes da Silva / Fábio Amodêo Lansac-Tôha / Rosana Mazzoni

    Acta Scientiarum: Biological Sciences, Vol 42, Pp e52710-e

    2020  Volume 52710

    Abstract: The aim of this study was to elaborate a taxonomic survey on the testate amoebae of the Family Arcellidae in coastal streams in the State of Rio de Janeiro. Six samplings were conducted in Ubatiba coastal stream (Maricá, RJ). In total, 130 liters water ... ...

    Abstract The aim of this study was to elaborate a taxonomic survey on the testate amoebae of the Family Arcellidae in coastal streams in the State of Rio de Janeiro. Six samplings were conducted in Ubatiba coastal stream (Maricá, RJ). In total, 130 liters water were filtered through a conical net of 60-μm mesh and preserved in 4% formalin. Organisms were identified with the aid of an inverted trinocular microscope. The morphological characteristics (lobose testate amoebae with shell composed of granular chitinoid elements) of each species were recorded. The species were described and illustrated. For the verification of new taxa records of Arcellidae in Rio de Janeiro and their distribution in Brazil, a search based on index articles by Scopus, Web of Science and Google Scholar using the keywords "tecamebas", "testate amoebae", "Arcella", "Arcellidae", "Brazil" and "Rio de Janeiro", was performed. Eight Arcellidae species were recorded. Some ecological and taxonomic information was provided. Due to the small amount of information on testate amoebae, this study is important because it reduces the knowledge gap regarding this community in the State of Rio de Janeiro. Furthermore, we suggest new studies on species identification to be conducted to expand regional knowledge about these organisms.
    Keywords arcella ; stream ; testate amoebae ; zooplankton ; Biology (General) ; QH301-705.5 ; Microbiology ; QR1-502
    Subject code 590
    Language English
    Publishing date 2020-08-01T00:00:00Z
    Publisher Universidade Estadual de Maringá
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  6. Article ; Online: Adjacent environments contribute to the increase of zooplankton species in a neotropical river

    Francieli de Fátima Bomfim / Tatiane Mantovano / Diogo Castanho Amaral / Welinton Sousa Palhiarini / Claudia Costa Bonecker / Fábio Amodêo Lansac-Tôha

    Acta Limnologica Brasiliensia, Vol 29, Iss

    2017  

    Abstract: Abstract Aim: The distribution of the zooplankton community along the Paraná River and in adjacent environments (tributaries and lakes) was evaluated, as well as the contribution of the community present in these environments to the species composition ... ...

    Abstract Abstract Aim: The distribution of the zooplankton community along the Paraná River and in adjacent environments (tributaries and lakes) was evaluated, as well as the contribution of the community present in these environments to the species composition of the Paraná River. It was expected that the ensemble of species found in the last sampling site of the Paraná River would represent the accumulation of species found in the upstream sites. Methods The community was sampled at 25 sites, during 2013 and 2014, and the species richness and composition were determined. The similarity in the composition of the community between the environments was evaluated using cluster analysis, and the contribution of the species to the Paraná River was evaluated using nestedness analysis, using the NODF index. Results Overall, 193 species were registered (116 rotifers, 48 cladocerans and 29 copepods), with the majority of species considered as rare (163 species). In general, the composition of the community in the river was dissimilar to the adjacent environments, although there was a relationship among communities. Rotifers presented broad distribution throughout the area. As expected, the zooplanktonic species presented a nested distribution, with the last river site representing a set of the species registered in the upstream sites. Conclusion The results show the importance of the tributaries and lakes to the occurrence of species along the river. The distinct hydrological characteristics of the environments, as well as flow velocity, depth and connectivity, were responsible for the development of planktonic populations in the lakes that arrived in the main river through tributaries. With these results, we suggest the importance of the conservation of adjacent environments of the Paraná River for the maintenance of the zooplanktonic species in this system.
    Keywords species nestedness ; spatial distribution ; species dispersal ; floodplain ; Ecology ; QH540-549.5
    Subject code 590
    Language English
    Publishing date 2017-12-01T00:00:00Z
    Publisher Associação Brasileira de Limnologia
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  7. Article ; Online: Geographical spread of the invasive species Kellicottia longispina (Kellicott, 1879) and K. bostoniensis (Rousselet, 1908)

    Francieli de Fátima Bomfim / Tatiane Mantovano / Leilane Talita Fatoreto Schwind / Fabiana Palazzo / Claudia Costa Bonecker / Fábio Amodêo Lansac-Tôha

    Acta Scientiarum: Biological Sciences, Vol 38, Iss

    A scientometric approach

    2016  Volume 1

    Abstract: Processes related to biological invasion of inland waters have become a major issue due to the increasing number of cases associated with the potential effects of invasions. Kellicottia bostoniensis and K. longispina are rotifer species originating from ... ...

    Abstract Processes related to biological invasion of inland waters have become a major issue due to the increasing number of cases associated with the potential effects of invasions. Kellicottia bostoniensis and K. longispina are rotifer species originating from North America and have become invasive in several continents. In this sense, this study carried out a scientometric analysis to analyze the geographical distribution and identify patterns of occurrence as well as to fill gaps on the knowledge of these species. The survey was based on articles indexed in databases from 1896 to 2014. There is a greater scientific knowledge of these species in the temperate region, and these are present in many different environments. In Brazil, there is a very small number of studies, and no record of K. longispina. Therefore, it is noteworthy the importance of studies on the occurrence and abundance of these species in poorly studied areas, such as subtropical and tropical regions, for a better understanding of their invasive potential, given the potential effects on different communities, which can affect the structure and dynamics of environments.
    Keywords Rotifera ; zooplankton ; dispersal potential ; time trend ; Biology (General) ; QH301-705.5 ; Microbiology ; QR1-502
    Subject code 590
    Language English
    Publishing date 2016-07-01T00:00:00Z
    Publisher Universidade Estadual de Maringá
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  8. Article ; Online: Rotifer community structure along a stretch under the influence of dams in the Upper Paraná River floodplain

    Tatiane Mantovano / Rodrigo Leite Arrieira / Leilane Talita Fatoreto Schwind / Claudia Costa Bonecker / Fábio Amodêo Lansac-Tôha

    Acta Scientiarum: Biological Sciences, Vol 37, Iss

    2015  Volume 3

    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 ... ...

    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 ; Biology (General) ; QH301-705.5 ; Microbiology ; QR1-502
    Subject code 333
    Language English
    Publishing date 2015-07-01T00:00:00Z
    Publisher Universidade Estadual de Maringá
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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