Vertical distribution of phytoplankton functional groups in a tropical shallow lake: driving forces on a diel scale

Barbosa, Luciana Gomes; Maia‐Barbosa, Paulina Maria; Barbosa, Francisco A. R.

doi:10.4322/actalb.2011.020

Cited by 18 publications

(13 citation statements)

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“…These groups are often polyphyletic and are based on attributes and physiological, morphological, and ecological similarities of the species that can potentially dominate or codominate certain habitats (Reynolds et al 2002). This approach, called the Reynolds Functional Groups (RFG) classification scheme (Kruk et al 2017), is widely used in ecological studies of freshwater phytoplankton and is applicable to different types of environments around the globe (Padisák et al 2006, Becker et al 2009, Barbosa et al 2011, Crossetti et al 2013, Costa et al 2016, Souza et al 2016, Jati et al 2017, Silva et al 2018, Selmeczy et al 2019.…”

Section: Introductionmentioning

confidence: 99%

Influence of water volume reduction on the phytoplankton dynamics in a semi-arid man-made lake: A comparison of two morphofunctional approaches

Braga

Becker

2020

An. Acad. Bras. Ciênc.

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Signifi cant reductions in the water levels of lakes are infl uenced by droughts and freshwater demands, especially in semi-arid regions, where hydric stress is greater.The aim of this study was to investigate the dynamics of phytoplankton during two different water volume periods resulting from an extended drought in a semi-arid lake. Another objective was to compare two functional approaches to test which one of these best captures phytoplankton variability as a function of environmental variability. Multivariate analyses performed using the Reynolds Functional Groups (RFG) and Morphology-Based Functional Groups (MBFG) classifi cation schemes indicated two periods, high and a low water volume. The results demonstrated the importance of light availability on phytoplankton assemblages as these two periods showed signifi cant differences in water transparency and phytoplankton composition. During extended droughts the reduction in water volume enhances the development of bloom-forming cyanobacteria through the limitation of light in a eutrophic man-made lake. Moreover, both functional traits approaches demonstrated the effect of light availability on phytoplankton assemblage composition and can be applied in similar systems. However, the RFG classifi cation provides more information and allows a more detailed description of the algal assemblages.

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Section: Introductionmentioning

confidence: 99%

Influence of water volume reduction on the phytoplankton dynamics in a semi-arid man-made lake: A comparison of two morphofunctional approaches

Braga

Becker

2020

An. Acad. Bras. Ciênc.

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“…In Brazil, studies on phytoplankton in short sampling intervals (24 hours cycle) have been carried out with his approach (Araújo et al, 2000;Barbosa, 2002;Melo and Huszar, 2000;Nabout and Nogueira, 2007;Becker et al, 2009;Barbosa et al, 2011;Cunha and Calijuri, 2011;Cruz, 2011;Dantas et al, 2009;Dantas et al, 2011). Natural coastal lagoons in Rio Grande do Norte systems are important, especially when using as water supply for the city of Natal, as in Extremoz Lake (Raposo and Gurgel, 2003).…”

Section: Introductionmentioning

confidence: 99%

Diel dynamic of phytoplankton functional groups in a tropical water supply, Extremoz Lake, northeastern Brazil

Pinto

Becker

2014

Acta Limnol. Bras.

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Aim: This study analyzed -the diel and vertical dynamics of phytoplankton functional groups in a natural tropical lake (Extremoz Lake, northeast Brazil), to investigate and understand the driver factors of the community during a severe drought period. Methods: Sampling of the abiotic variables and phytoplankton was performed at intervals of 6 hours over 24 hours in vertical profiles, in dry and rainy seasons (according to the historical average). The phytoplankton species were grouped according to the functional groups' approach sensu Reynolds et al. (2002). Results: October/12 was considered as a dry period (18.4 mm), while March/13, due to the historical average, as a rainy season, due to the low rainfall during the study period (15.7 mm), it was called severe drought. The lake showed thermal and chemical destratification in both periods. Phytoplankton biomass was higher in the dry season and their vertical distribution was stratified in both periods. In both samplings there were less algal biomass during the night. Phytoplankton functional groups of mixed and shallow systems (S 1 , L 0 and K) were descriptors throughout the study period with higher biomass always registered in the group S 1 , represented by Planktolyngbya limnetica (Cyanobacteria) Conclusion: The lack of seasonality observed in this study, due to prolonged drought, may have influenced the pattern of homogeneous behavior in both samplings. This pattern strongly influenced the vertical distribution of phytoplankton in the two periods, with a constancy of dominance of functional descriptors groups.Keywords: shallow lake, vertical distribution, cyanobacteria, functional groups.Resumo: Objetivo: O nosso trabalho teve como objetivo avaliar a dinâmica nictemeral e vertical dos grupos funcionais fitoplanctônicos em uma lagoa natural tropical (Lagoa de Extremoz, nordeste do Brasil), para investigar e compreender os fatores direcionadores da comunidade em um período de seca severa. Métodos: As amostragens das variáveis abióticas e do fitoplâncton foram realizadas a intervalos de 6 horas ao longo de um ciclo de 24 horas em perfis verticais nas estações de seca e chuva. As espécies fitoplanctônicas foram agrupadas de acordo com a abordagem de grupos funcionais sensu Reynolds et al. (2002). Resultados: O mês de outubro/12 foi caracterizado como período seco (18,4 mm), enquanto que março/13, pela média histórica era caracterizado período chuvoso, devido a baixa precipitação no período de estudo (15,7 mm), foi denominado seca severa. A lagoa apresentou desestratificação térmica e química em ambos períodos. A biomassa do fitoplâncton foi maior na estação seca e a distribuição vertical da mesma foi estratificada em ambas os períodos. Em ambas as amostragens houve menor biomassa algal nos períodos noturnos. Grupos funcionais fitoplanctônicos típicos de ambientes rasos e misturados (S 1 , L 0 e K) foram descritores durante todo o período do estudo, com maior biomassa registrada sempre no grupo S 1 , representado pela Planktolyngbya limnetica (Cyanobac...

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“…Other studies (e.g. Barbosa et al, 2011) also found this species in the deepest layer of a tropical stratified lake (Lake Carioca, MG, Brazil). It is known that this species preferentially occupies the deeper layers, owing to its tolerance to light deficiency (Reynolds et al, 2002).…”

Section: Discussionmentioning

confidence: 96%

“…In some cases, this can be related to the small cells size (Scenedesmus ecornis and Synechococcus sp.) or to the buoyancy of the colony mucilaginous matrix (Aphanocapsa delicatissima) that avoid sedimentation (Barbosa et al, 2011). Even large filamentous species such as Mougeotia sp.…”

Section: Discussionmentioning

confidence: 99%

Short-term thermal stratification and partial overturning events in a warm polymictic reservoir: effects on distribution of phytoplankton community

et al. 2015

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In lentic freshwater ecosystems, patterns of thermal stratification play a considerable part in determining the population dynamics of phytoplankton. In this study we investigated how these thermal patterns and the associated hydrodynamic processes affect the vertical distribution of phytoplankton during two consecutive diel cycles in a warm polymictic urban reservoir in the metropolitan region of São Paulo, Brazil. Water samples were taken and physical, chemical and biological data collected at half-meter intervals of depth along a water column at a fixed site, every 3 hours throughout the 48-hour period. Two events of stratification, followed by deepening of the thermocline occurred during the study period and led to changes in the vertical distribution of phytoplankton populations. Aphanocapsa delicatissima Nägeli was the single dominant species throughout the 48-hour period. In the second diel cycle, the density gradient induced by temperature differences avoided the sedimentation of Mougeotia sp. C. Agardh to the deepest layers. On the other hand, Pseudanabaena galeata Böcher remained in the 4.0-5.5 m deep layer. The thermal structure of the water was directly affected by two meteorological factors: air temperature and wind speed. Changes in the cell density and vertical distribution of the phytoplankton were controlled by the thermal and hydrodynamic events.Keywords: phytoplankton, thermohydrodynamics, thermal stratification, diel variation, Guarapiranga reservoir. Estratificação térmica de curto prazo e eventos de desestratificação parcial em um reservatório polimítico quente: efeitos sobre a distribuição da comunidade fitoplanctônica ResumoEm ecossistemas de água doce, os padrões de estratificação térmica têm uma influência considerável sobre a dinâmica populacional do fitoplâncton. Neste estudo nós investigamos como os padrões de estratificação térmica e os processos hidrodinâmicos afetaram a distribuição vertical do fitoplâncton durante dois ciclos nictemerais consecutivos em um reservatório urbano na cidade de São Paulo. As amostragens e medidas das variáveis físicas e químicas foram realizadas a cada três horas durante um período de 48 horas, ao longo de um perfil vertical. Ocorreram dois eventos de estratificação e subsequente abaixamento da termoclina acarretando alterações na distribuição vertical do fitoplâncton. Aphanocapsa delicatissima Nägeli foi a principal espécie dominante durante todo o período avaliado. No segundo ciclo nictemeral o gradiente de densidade criado pelas diferenças de temperatura impediu o afundamento de Mougeotia sp. C. Agardh para as camadas mais profundas. Por outro lado Pseudoanabaena galeata Böcher se manteve nas camadas de 4.0 e 5.5 m. A estrutura térmica da água foi diretamente afetada pelos fatores meteorológicos temperatura do ar e velocidade do vento. As mudanças na densidade e na distribuição vertical do fitoplâncton foram controladas pelos eventos térmicos e hidrodinâmicos.Palavras-chave: fitoplâncton, termohidrodinâmica, estratificação térmica, variação ...

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Vertical distribution of phytoplankton functional groups in a tropical shallow lake: driving forces on a diel scale

Cited by 18 publications

References 30 publications

Influence of water volume reduction on the phytoplankton dynamics in a semi-arid man-made lake: A comparison of two morphofunctional approaches

Influence of water volume reduction on the phytoplankton dynamics in a semi-arid man-made lake: A comparison of two morphofunctional approaches

Diel dynamic of phytoplankton functional groups in a tropical water supply, Extremoz Lake, northeastern Brazil

Short-term thermal stratification and partial overturning events in a warm polymictic reservoir: effects on distribution of phytoplankton community

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