Ariadne Moura

Ariadne Moura
Universidade Federal Rural de Pernambuco | UFRPE · Department of Biology

PhD

About

91
Publications
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1,585
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Publications

Publications (91)
Article
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Trophic interaction in tropical regions is influenced by factors such as the size of organisms and the presence of intermediate predators. Macrophytes can act directly on predator–prey dynamics through the habitat structure provided by plants. We conducted an in situ mesocosm experiment (100 L) in a Brazilian reservoir to evaluate the top-down and...
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Cyanobacterial blooms are increasingly common in aquatic environments worldwide. These microorganisms cause concern due to their ability to produce cyanotoxins. Aquatic organisms, especially zooplankton, are exposed to cyanobacterial toxins by different routes, depending on the bloom phase. During cyanobacterial dominance, zooplankton is exposed to...
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Trait-based classifications can efficiently capture species’ responses to environmental gradients and their impacts on ecosystem functioning. Thus, the clustering of phytoplankton species into functional groups can improve the understanding of their relationships with the environment and help to predict their response to environmental changes. Acco...
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Cyanobacterial blooms can cause severe ecological and health problems in drinking water reservoirs. To alleviate this problem, allelopathically active submerged macrophytes can be used to reduce cyanobacterial growth. Accordingly, this study aimed to evaluate the sensitivity of strains of the Microcystis aeruginosa complex isolated from reservoirs...
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Introduction: Cyanobacterial blooms in tropical water bodies are increasingly common, because of eutrophication and rising temperatures. Consequently, many freshwater systems are affected, by reducing water quality, biodiversity, and ecosystem services. With the increased frequency of harmful algal blooms, the development of biological tools to imp...
Article
Aquatic macrophytes may have a significant effect on associated communities such as epiphytes and macroinvertebrates, which through the structural complexity of habitat, provide shelter, resources, and interspecific interactions. We tested the hypothesis that the structural complexity of macrophytes positively modifies epiphytes and macroinvertebra...
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Top-chain predators play a fundamental role in the functioning of shallow reservoirs. Studies to elucidate the cascade effects produced by fish on macroinvertebrates and periphytic algae are fundamental for understanding the functioning of aquatic ecosystems. We conducted an enclosure experiment to test the isolated and combined effects of macroinv...
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Aim To test the hypothesis that zooplankton changes the structure of phytoplankton in tropical reservoirs by reducing the biomass of algal species susceptible to herbivory. Methods We experimentally evaluated the species-specific responses of phytoplankton to zooplankton within eutrophic reservoirs with different phytoplankton community structure i...
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Harmful algal blooms are among the emerging threats to freshwater biodiversity that need to be studied further in the Anthropocene. Here, we studied freshwater plankton communities in ten tropical reservoirs to record the impact of algal blooms, comprising different phytoplankton taxa, on water quality, plankton biodiversity, and ecosystem function...
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We analyzed structural attributes (epiphyton composition, richness, density, biomass, and life forms) involved in interactions between the epiphyton and Characeae (Chara and Nitella) in 19 tropical reservoir environments, 7 with the presence of Chara, 7 with Nitella, and 5 with both genera. A sampling station measuring 4 m² was defined in each envi...
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Functional classifications are important for studies with phytoplankton, because they are based on ecological or morphological characteristics. We tested the interference of the macrophyte coverage in taxonomic and functional structure of phytoplankton community. Twelve small reservoirs were visited in September 2015 and May 2016 in semiarid region...
Article
The aim of the present study was to relate the vegetation cover of Egeria densa to climatic, limnological and diversity variables to gain an understanding of how they affect occurrence and colonization of the macrophyte. This study was conducted in six reservoirs of the Paraíba do Norte River Basin. Six sampling units were established in each reser...
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Shallow lakes are often affected by the increase in nutrients and global climate change, with frequent occurrences of cyanobacterial blooms. In this context, the biomanipulation of the higher trophic levels, such as zooplankton, can efficiently control these blooms. Based on this, this study aimed to verify the potential of a medium-sized cladocera...
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Nutrient enrichment of aquatic bodies increases N and P concentrations and may affect the trophic interactions of communities. Benthic microalgae assemblages are regulated by both abiotic (e.g., nutrient) and biotic (e.g., grazing) factors. Here, we focus on how benthic communities have changed along the seasonality and availability of nutrients in...
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The vertical distribution of phytoplanktonic species in tropical regions responds quickly to the physicochemical factors of water with ecophysiological changes and biomass. Abiotic factors are responsible for the changes in the dominance of the different groups. The study analyzed the diversity and dominance of the phytoplankton community in a eutr...
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Aim To assess the allelopathic effects of the submerged macrophyte Ceratophyllum demersum on four strains of phytoplankton species: two cyanobacteria (Microcystis aeruginosa - microcystin producing and M. panniformis - non-microcystin producing), and two chlorophytes (Ankistrodesmus falcatus and Raphidocelis subcapitata). Methods A coexistence exp...
Article
Harmful cyanobacterial blooms have caused several problems in freshwater environments due to their prolific growth and the harmful cyanotoxins produced by some species. The occurrence of these organisms has increased in recent decades due to climate change and eutrophication, although most studies are from temperate regions in the Northern hemisphe...
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Zooplankton are important biocontrol agents for algal blooms in temperate lakes, while their potential in tropical and subtropical environments is not well understood. The aim of the present study was to evaluate the influence of increased zooplankton biomass on phytoplankton community and cyanotoxins (microcystins and saxitoxin) content of a tropi...
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In this study, the structure of phytoplankton communities in reservoirs with constant cyanobacteria blooms was evaluated using stability, persistence and species richness analyses. Samples were collected monthly from three reservoirs in northeastern Brazil between February 2012 and January 2013. The phytoplankton taxa were quantified under an inver...
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Experiments were conducted to evaluate the N:P ratio, as well as the effects of the interaction between this ratio and zooplankton, on phytoplankton in a tropical reservoir. Three experiments were performed in the presence (+Z) or absence (-Z) of zooplankton and the addition of N and P in different ratios (N:P molar ratio of 5, 16 and 60).In Experi...
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Este estudo analisou a possível influência da temperatura e nutrientes (fósforo total ortofosfato, fósforo total dissolvido, nitrogênio total, nitrito e nitrato) na coocorrência de Cylindrospermopsis raciborskii e Microcystis panniformis no reservatório Mundaú, um ecossistema do semiárido do nordeste do Brasil. Amostras foram coletadas bimestralmen...
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The installation of dams causes changes to the integrity of rivers and to the water cycle, performing an instrumental role in the organization of biological communities, including that of phytoplankton. In the present study, we analyzed the taxonomic composition of phytoplankton in two hydroelectric reservoirs on the São Francisco River, Itaparica...
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Microcistinas (MC) são as toxinas de cianobactérias mais estudadas, uma vez que são amplamente distribuídas e responsáveis por vários casos de intoxicação humana e animal. São potentes inibidoras das proteínas fosfatases serina/treonina 1 (PP1) e 2A (PP2A). As fosfatases PP1 e PP2A também estão presentes em plantas, as quais podem sofrer efeitos ad...
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Worldwide cyanobacterial blooms have been registered, where harmful species dominance is associated to producing of toxic compounds (cyanotoxins) with adverse effects on several organisms. Acute toxicity of crude extracts from Microcystis bloom occurring in Mundaú reservoir was evaluated by bioassays with the neotropical Cladocera Moina minuta. Sam...
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Brazil has a history of blooms and contamination of freshwater systems by cyanobacterial toxins. The monitoring relevance of toxins from cyanobacteria in reservoirs for public supply is notorious given its high toxicity to mammals, included humans beings. The most recurrent toxins in Brazilian water bodies are microcystins (MC). However, the recent...
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This paper contributes to the inventory of cyanobacteria in freshwater environments in Northeastern Brazil. Forty-two samples were collected from 19 reservoirs between February 2009 and January 2010. Twenty-three species of cyanobacteria distributed among the orders Chroococcales (10), Oscillatoriales (8) and Nostocales (5) were identified, 12 of w...
Chapter
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Este estudo foi conduzido com o objetivo de conhecer a flora planctônica de um lago temporário no Parque Estadual Mata da Pimenteira. Foi observada uma comunidade fitoplanctônica rica e diversificada com 88 espécies, distribuídas em nove classes. As algas verdes apresentaram maior riqueza, com 49 espécies, seguidas pelas diatomáceas e cianobactéria...
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Reis Lake is located in the municipality of Caracaraí, state of Roraima (Brazil) and is subject to fluctuations in water level. The aim of this study was to analyze the structure of the phytoplankton community on the nictemeral and seasonal scales and determined the influence of limnological variables. Sampling was performed in the rainy season (Ju...
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Our objective was to investigate crude extracts toxic (MC+) and non-toxic (MC-) effects on the growth of Microcystis panniformis, Microcystis aeruginosa and Microcystis wesenbergii. Cultures were submitted to extracts MC+ at 5 and 10 MC µg.L -1 , and to MC-equivalent weight of these concentrations. Both crude extracts worked toward reducing the gro...
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Plankton diversity, physical and chemical variables and chlorophyll a were analyzed in two shallow urban reservoirs with different trophic degrees on Pernambuco State, northeastern Brazil. High eutrophication levels were observed in Apipucos reservoir, while Prata reservoir was considered oligotrophic. Values reported for physical and chemical vari...
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Spatial and temporal variations in phytoplankton communities in continental waters have received attention from limnologists, since they are differently influenced by many physico-chemical and biological factors. This study was undertaken with the aim to identify the environmental variables that influence the temporal and spatial dynamics of the ph...
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Cylindrospermopsis raciborskii (Woloszynska) Seenayya et Subba Raju (Ordem Nostocales) is one of the most troublesome bloom-forming species in Brazil. Understanding the population dynamics of the different morphotypes of C. raciborskii (straight and coiled) could assist in the prediction of favourable conditions for the proliferation of this potent...
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Phytoplankton composition in lotic environments has received less attention than that of lentic environments. The aim of the present study was to describe the micro-phytoplankton of the Contas River, which is one of the five most important water bodies in the state of Bahia, Brazil. Collections were carried out at 28 sampling sites at three-month i...
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The aim of the present study was to evaluate the influence of seasonality on the behavior of phytoplankton associations in eutrophic reservoirs with different depths in northeastern Brazil. Five collections were carried out at each of the reservoirs at two depths (0.1. m and near the sediment) at three-month intervals in each season (dry and rainy)...
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This study aims to analyze the effects of nutrients and predation by zooplankton on phytoplankton biomass (chlorophyll a) in a eutrophic reservoir in Brazil (Apipucos Reservoir, State of Pernambuco), through experiments in microcosms. For this, samples of water were placed in 1 L Erlenmeyer flasks and kept for seven days. Treatments included the ad...
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This paper reports the first record of the genus Ceratium Schrank, 1973 in six freshwater ecosystems in the semiarid region of Brazil. From 2006 to 2010, 1176 samples were collected from 98 different sites using conical-cylindrical plankton nets with a 25 μm mesh size. Twenty individuals from each sample were measured for the obtainment of the morp...
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The present study reports the phytoplankton abundance, dominance and co-existence relationships in the eutrophic Carpina reservoir, Pernambuco, Brazil. Sampling was carried out at six different depths bimonthly at a single reservoir spanning two climatic periods: dry season (January, September, and November 2006) and rainy season (March, May, and J...
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This study investigated the dynamics of cyanobacteria in two deep, eutrophic reservoirs in a semi-arid region of Brazil during periods of stratification and destratification. Four collections were carried out at each reservoir at two depths at three-month intervals. The following abiotic variables were analyzed: water temperature, dissolved oxygen,...
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Resumo Studies aimed at determining phytoplankton composition, biomass, ecology and some physical-chemical characteristics of the São Francisco estuary were conducted at 7 sampling stations located in Piaçabuçu-Alagoas (10º25’-10°30’S and 36º23’-36º27W) during the rainy and dry seasons. The samples were obtained from the subsurface layer at neap a...
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This study analysed vertical and temporal variations of cyanobacteria in a potable water supply in northeastern Brazil. Samples were collected from four reservoir depths in the four months; September and December 2007; and March and June 2008. The water samples for the determination of nutrients and cyanobacteria were collected using a horizontal v...
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It is reported for the first time in Brazil and South America the presence of cylindrospermopsin (CYN) in water supply reservoirs. CYN is a powerful hepatotoxic alkaloid implicated in outbreaks of human sick-nesses. We detected CYN in different sources of water in Northeastern Brazil using molecular and immu-nological techniques. The highest concen...
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This study investigated the structure and dynamics of phytoplankton in Bitury Reservoir (Pernambuco, Brazil), over two season periods, relating the variations of density to physicochemical characteristics (pH, water temperature, electrical conductivity, turbidity, total phosphorus and total nitrogen). Samples were taken in August and October/2008 (...
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Natural lake systems represent important reservoirs for residential water supply, fish production, recreational activities and enjoyment of their natural beauty. Nevertheless, human impacts may affect their health status resulting in degradation and loss of biodiversity. The aim of the present study was to obtain data on the health status of a natu...
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Este estudo objetivou conhecer a flora planctônica do Rio de Contas, verificando a variação espacial e temporal de sua composição e estrutura. Foram analisadas densidade, riqueza, abundância e dominância de espécies. Ocorreram padrões temporais distintos de distribuição longitudinal, com maior abundância de Chlorophyceae no reservatório de Pedra, s...
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(Spatial-temporal variation in coiled and straight morphotypes of Cylindrospermopsis raciborskii (Wolsz) Seenayya et Subba Raju (Cyanobacteria)). This study reports the spatial and temporal behavior of straight and coiled morphotypes of C. raciborskii in a reservoir in Brazil's semiarid region as well as the main factors responsible for the variabi...
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The escalating occurrence of cyanobacterial toxic blooms demands a better understanding of genetic variability as an auxiliary expedient in species identification, collaborating with the monitoring of water destined to public supply. This study aimed at the unraveling of genetic polymorphism in the toxic and nontoxic strains of Microcystis (Cyanoba...