Seasonal dynamics of cyanobacteria in a eutrophic reservoir (Arcoverde) in a semi-arid region of Brazil

Mc, Bittencourt-Oliveira; Sn, Dias; An, Moura; Mk, Cordeiro-Araújo; Ew, Dantas

doi:10.1590/s1519-69842012000300016

Cited by 18 publications

(11 citation statements)

References 47 publications

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“…The different periods analyzed were not marked by destratification during the rainy period and stratification during the dry period, related to seasonal thermal pattern, as observed for others works to the tropics (Barbosa et al, 2011;Dantas et al, 2011;Bittencourt-Oliveira et al, 2012). In this study, the atelomictic event in rainy season, may have occurred because of hydrological changes (severe droughts throughout the year, making it atypical), and probably this thermal condition has not contributed strongly to changes in most physical and chemical conditions between the two periods, and therefore has not promoted changes on the composition and species dominance.…”

Section: Discussionsupporting

confidence: 71%

“…The physiological needs and responses that lead to changes, such as in diversity, biomass, taxonomic composition, dominance and patterns of vertical distribution of the phytoplanktonic species (Naselli-Flores & Barone 2005;Naselli-Flores et al, 2007;Becker et al, 2008;Tolotti et al, 2010) are rapid, proportionate to the brief life cycle of this group of organisms, where the variations tend to be higher than in the nycthemeral cycles in seasonal scales (MacIntyre & Melack, 1988). Thus, studies such as Becker et al (2008), Borges et al (2008), Bittencourt-Oliveira et al (2012) have been conducted in nycthemeral scale (24 h) in order to understand the important questions about the dynamics of the algal community.…”

Section: Introductionmentioning

confidence: 99%

“…This pattern of diurnal heating followed by a drop in temperature at night is common in the semi-arid region of northeastern Brazil. In this region, the reservoirs are characterized as eutrophic to hypertrophic, with consequent reduction in phytoplankton diversity and high biomass of cyanobacteria, leading to dominance of this group, which in turn, has been represented by one or a few species (Bouvy et al, 2000;Huszar et al, 2000;Chellappa & Costa, 2003;Aragão et al, 2007;Moura et al, 2011;Chellappa et al, 2008;Dantas et al, 2011;Bittencourt-Oliveira et al, 2012, 2014.…”

Section: Introductionmentioning

confidence: 99%

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Diversity and Dominance in phytoplankton community during nycthemeral cycles at different thermal patterns in water body in semiarid region of Brazil

Moura

Aragão-Tavares

Filho

et al. 2019

J. Env. Anal. Progr.

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A B S T R A C TThe 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 eutrophic reservoir localized in the semiarid region of Brazil. The samplings were conducted in nycthemeral cycles in different thermal regimes along a vertical profile. The biomass was determined by density and specific biovolume. Patterns of richness, diversity and specific dominance index were analyzed. The significant differences between the biotic data were analyzed by the ANOVA two-way and t-test. Similarity matrices were plotted using the Jaccard and Bray-Curtis indices with subsequent data ordination. 33 taxa were identified during the study. Differences in thermal patterns that are occurring in nycthemeral cycles showed changes in the structure of the phytoplankton community. The atelomictic event contributed to changing of the algal structure, especially in biomass, dominance, and diversity that shows significant differences between periods. The lowest diversity reported (< 1.03 bits.L -1 ) were influenced by monospecific dominance of the cyanobacteria C. raciborskii, thus recording greater biomasses, forming blooms throughout the study period. In the tropical eutrophic reservoirs, an algal bloom of cyanobacteria has persisted throughout the year, regardless of variations in the thermal regime, thereby reducing the phytoplankton diversity.

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Section: Discussionsupporting

confidence: 71%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Diversity and Dominance in phytoplankton community during nycthemeral cycles at different thermal patterns in water body in semiarid region of Brazil

Moura

Aragão-Tavares

Filho

et al. 2019

J. Env. Anal. Progr.

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“…In contrast, Cylindrospermopsis raciborskii outgrew Planktothrix agardhii at higher NH 4 + concentrations. Bittencourt-Oliveira et al (2012) found that in Arcoverde reservoir, the populations of Planktothrix agardhii and Cylindrospermopsis raciborskii were negatively related, with the species prevalence depending on the seasonal periods.…”

Section: Discussionmentioning

confidence: 94%

Impact of filamentous cyanobacteria on the water quality of two tropical reservoirs

Barros

Lopes

Carvalho³

et al. 2017

RBRH

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Artificial lakes play an important role in water availability in tropical semi-arid Northeastern Brazil. However, in addition to the negative effects that dams have on the water quality of rivers, other practices such as discharge of untreated wastewater, intensive crop fertilization and fish farming have been contributing to water quality deterioration. Climate change may be another driver of water quality decrease. Increases in precipitation and drought intensities as well as temperature increase may redefine the dynamics of planktonic communities and favour species more adapted to the new environment. Water samples were collected in two reservoirs selected based on the recurrence of positive results for saxitoxins, Acarape do Meio (AM) and Sitios Novos (SN). In general, diversity in SN (1.08) was higher than in the AM (0.60). Phytoplankton dynamics in these reservoirs differ from other reservoirs in the same region of Brazil, in the sense that filamentous cyanobacteria are dominant. Furthermore, lower diversity, concentration and richness of chlorophyceae and bacillariophyceae were found in both reservoirs. Increase in diversity was observed during the intense rainy season of 2011, suggesting a slight improvement of water quality. A close inverse correlation between Cylindrospermopsis sp and other cyanobacteria was found in SN (R 2 = -0.862) and in AM (R 2 = -0.997) and the data collected demonstrates that a season with intensive rainfall may lead to lower cyanobacteria concentrations probably due to water dilution and higher flushing rates.Keywords: Artificial reservoirs; Freshwater cyanobacteria; Semi-arid regions; Temporal phytoplankton dynamics; Eutrophication. RESUMOOs lagos artificiais tem um papel primordial na disponibilidade hídrica no semi-árido Brasileiro. Entretanto, além dos efeitos negativos que os barramentos dos rios causam sobre a qualidade da água, a descarga de esgotos, a irrigação e a piscicultura intensivas vêm acentuando a deterioração da qualidade da água em um ritmo sem precedentes nesta região. A mudança climática é outro fator de impacto negativo na qualidade da água. O aumento da intensidade das precipitações pode redefinir a dinâmica das comunidades de plâncton e espécies mais adaptadas a ambientes extremamente variáveis. Os reservatórios estudados, Acarape do Meio (AM) e Sítios Novos (SN), foram selecionados com base na recorrência de resultados positivos para saxitoxinas. A dinâmicas do fitoplâncton encontrada, difere de outras áreas da mesma região, no sentido em que as cianobactérias filamentosas são dominantes. Baixas diversidade, concentração média e riqueza de Chlorophyceae e Bacillariophyceae foram encontrados em ambos os reservatórios, embora tenha sido observado um aumento durante o intenso período chuvoso de 2011, sugerindo uma ligeira melhoria da qualidade da água. Em geral, a diversidade no reservatório SN (1,08) foi maior que no AM (0,60). Uma correlação inversa entre a concentração de Cylindrospermopsis sp e outras cianobactérias foi encontrada nos reservatór...

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“…The seasonal rainfall of central Brazil is one of the main environmental factors controlling the aquatic biota (Bittencourt-Oliveira et al, 2012;Santos-Wisniewski and Rocha, 2007) because the temperature variations do not have sufficient amplitude to alter the patterns of the communities. Indeed, the structure of the aquatic insect communities is dependent, among other factors, on the physical-chemical conditions of the water, substrate availability, and biological interactions (Silveira et al, 2006;Vannote et al, 1980).…”

Section: Discussionmentioning

confidence: 99%

The rainy season increases the abundance and richness of the aquatic insect community in a Neotropical reservoir

et al. 2015

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Alterations in aquatic systems and changes in water levels, whether due to rains or dam-mediated control can cause changes in community structure, forcing the community to readjust to the new environment. This study tested the hypothesis that there is an increase in the richness and abundance of aquatic insects during the rainy season in the Serra da Mesa Reservoir, with the premise that increasing the reservoir level provides greater external material input and habitat diversity, and, therefore, conditions that promote colonization by more species. We used the paired t test to test the differences in richness, beta diversity, and abundance, and a Non-metric Multidimensional Scaling (NMDS) was performed to identify patterns in the community under study. Additionally, Pearson correlations were analyzed between the richness, abundance, and beta diversity and the level of the reservoir. We collected 35,028 aquatic insect larvae (9,513 in dry period and 25,515 in the rainy season), predominantly of the Chironomidae family, followed by orders Ephemeroptera, Trichoptera, and Odonata. Among the 33 families collected, only 12 occurred in the dry season, while all occurred in the rainy season. These families are common in lentic environments, and the dominance of Chironomidae was associated with its fast colonization, their behavior of living at high densities and the great tolerance to low levels of oxygen in the environment. The hypothesis was confirmed, as the richness, beta diversity, and abundance were positively affected by the increase in water levels due to the rainy season, which most likely led to greater external material input, greater heterogeneity of habitat, and better conditions for colonization by several families.Keywords: temporal variation, Serra da Mesa reservoir, zoobenthic, and level water. Período chuvoso aumenta a abundância e riqueza da comunidade de insetos aquáticos em um reservatório neotropical ResumoAlterações nos sistemas aquáticos, bem como variações nos níveis da água, sejam devido a chuvas ou pelo controle exercido pela barragem podem provocar mudanças na estruturação das comunidades fazendo com que as mesmas sejam obrigadas a se readequar às novas características do ambiente. Este estudo testou a hipótese de que ocorre aumento na riqueza e abundância de insetos aquáticos na estação chuvosa no reservatório de Serra da Mesa com a premissa que o aumento do nível do reservatório proporciona maior entrada de material alóctone, maior diversidade de habitats e, consequentemente, condições para a colonização de mais espécies. Para testar as diferenças na riqueza, diversidade beta e abundância foi utilizado o test t pareado e, além disso, foi feita uma NMDS para identificar padrões na comunidade em estudo. Foram coletados 35.028 larvas de insetos aquáticos (9513 no período seco e 25.515 no período de cheia) com predominância da família Chironomidae seguida das famílias Ephemeroptera, Trichoptera e Odonata. Dentre as 33 famílias coletadas, apenas 12 ocorreram no período de seca, enquanto...

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Seasonal dynamics of cyanobacteria in a eutrophic reservoir (Arcoverde) in a semi-arid region of Brazil

Cited by 18 publications

References 47 publications

Diversity and Dominance in phytoplankton community during nycthemeral cycles at different thermal patterns in water body in semiarid region of Brazil

Diversity and Dominance in phytoplankton community during nycthemeral cycles at different thermal patterns in water body in semiarid region of Brazil

Impact of filamentous cyanobacteria on the water quality of two tropical reservoirs

The rainy season increases the abundance and richness of the aquatic insect community in a Neotropical reservoir

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