Functional diversity and adaptative strategies of planktonic and periphytic algae in isolated tropical floodplain lake

Dunck, Bárbara; Bortolini, Jascieli Carla; Rodrigues, Liliana; Rodrigues, Luzia Cleide; Jati, Susicley; Train, Sueli

doi:10.1007/s40415-013-0029-y

Cited by 31 publications

(19 citation statements)

References 29 publications

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“…Deletic and Maksimovic (1998) and Jones and Sauter (2005) suggested that the decrease in the concentration of cyanobacteria after a rainfall event could be explained by the increase in turbidity due to dissolved organic carbon and suspended sediments. Filamentous species are not favoured by high turbidity, which inhibit access to light and nutrients in the water column (DUNCK et al, 2013). Another plausible explanation for that decrease was proposed by Bouvy et al (2001).…”

Section: Discussionmentioning

confidence: 99%

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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Section: Discussionmentioning

confidence: 99%

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

Barros

Lopes

Carvalho³

et al. 2017

RBRH

View full text Add to dashboard Cite

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“…However, under an enrichment condition with phosphorus and nitrogen (NP+), under the disturbance effect, C-S strategists dominated throughout the succession process in relative density and biovolume. On the other hand, Dunck et al (2013b) reported that in an isolated floodplain lake, R-strategist species were dominant only in low waters, most likely due to the frequent disturbances with varied availability of resources of this hydrological period.…”

Section: Discussionmentioning

confidence: 98%

“…Because algae possess passive and generally unlimited dispersal (Finlay, 2002), the flood pulse can facilitate this process (Algarte et al, 2014;Dunck et al, 2013b), and thus, species with different functional traits can become established in these environments. These results are similar to those found by Dunck et al (2013b) when they evaluated functional diversity of periphytic algae from natural substrates in an isolated lake located in the same floodplain. They also concluded that the high water period enhances the variety of niches and that the dispersal is eased by the flood pulse, thereby allowing the development of more species with different functional traits.…”

Section: Discussionmentioning

confidence: 99%

“…The establishment and development of certain species in the periphytic matrix may be favored by particular functional traits, such as morphology and cell size (Biggs, 1996;Biggs et al, 1998;Ferragut and Bicudo, 2010;Dunck et al, 2013b). In general, smaller and fast colonizing species with high dispersal capacity characterize early successional stages, and towards the climax or biomass peak of communities, species that better compete for resources and adapt to disturbances predominate (McCormick, 1996;Biggs, 1996;Biggs et al, 1998).…”

Section: Introductionmentioning

confidence: 99%

“…Schneck & Melo (2012) experimentally evaluated the effect of substratum roughness on the resistance and resilience of five life forms of stream benthic algae following a hydrological disturbance. Dunck et al (2013b) analyzed the adaptive strategies and functional diversity of these communities in a floodplain lake considering the disturbance of flood pulse. Dunck et al (2015) explored patterns in species and functional dissimilarities of periphytic algae in floodplain lakes.…”

Section: Introductionmentioning

confidence: 99%

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Functional diversity and functional traits of periphytic algae during a short-term successional process in a Neotropical floodplain lake

Dunck

Rodrigues

2015

Braz. J. Biol.

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Due to the lack of knowledge in periphytic algae functional diversity patterns during successional processes in floodplains, the present study aimed to analyze the dynamics of the functional traits and functional diversity of periphytic species during a short-term successional process in a floodplain lake. The functional traits analyzed were size class, growth form, strength of attachment to the substratum, and functional strategies. We evaluated the dynamics of these traits, considering richness, density and biovolume during an 18-day colonization in two hydrological periods. The functional diversity was assessed using the mean pairwise distance index (MPD). Dominant functional traits during the colonization changed in association with the flood pulse. Under the pulse effect, higher development of C-S strategist, loosely attached, filamentous and nanoperiphytic species occurred. The highest values of functional diversity were associated with the algal biomass peak during the colonization and the high water hydrological period, possibly indicating greater efficiency in the ecosystem functioning. These findings show the importance of the functional traits approach in periphyton studies and that the selection of functional traits must be performed taking into account traits that represent the species niche.Keywords: experiment, functional strategies, MPD, periphyton.Diversidade funcional e características funcionais de algas perifíticas em um curto processo successional em um lago de planície de inundação Neotropical Resumo Devido à ausência de conhecimento sobre os padrões para a diversidade funcional de algas perifíticas durante processo sucessional de curto tempo, o presente estudo objetivou avaliar a dinâmica das características funcionais e da diversidade funcional dessas espécies durante a sucessão em um lago de planície de inundação. As características funcionais analisadas foram classe de tamanho, forma de vida, intensidade de aderência ao substrato e estratégias funcionais. Foi avaliada a dinâmica destas características funcionais, considerando riqueza, densidade e biovolume, durante 18 dias de colonização, em dois períodos hidrológicos distintos. A diversidade funcional estimada pelo índice de distância média entre pares (MPD). As características funcionais dominantes se alteraram durante a colonização proporcionado pelo pulso de inundação. Sobre este efeito houve grande desenvolvimento de espécies C-S estrategistas, frouxamente aderidas, filamentosas e nanoperifíticas. Os maiores valores de diversidade funcional foram relacionados com o pico de biomassa algal ao longo da colonização e com o período de águas altas, e que isso provavelmente indica maior eficiência no funcionamento do ecossistema. Este estudo mostrou a importância de incluir as características funcionais nos estudos de algas perifíticas, e que a seleção de características deve ser feita levando em consideração o nicho das espécies.Palavras-chave: experimento, estratégias funcionais, MPD, perifíton.

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Patterns in species and functional dissimilarity: insights from periphytic algae in subtropical floodplain lakes

2015

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Understanding spatial and temporal changes in species composition has long demanded the attention of ecologists. However, only recently questions related to changes in species functional traits have been investigated. We explored patterns of species and functional dissimilarity of periphytic algae at six lakes sampled over a year across a subtropical floodplain. We evaluated the importance of turnover and nestedness components across space and time; the influence of environmental dissimilarity, spatial distance, and time on species and functional dissimilarity; and whether functional dissimilarity results from nonstochastic assembly processes. We used six functional traits to describe 155 species. Functional dissimilarity was estimated by functional dendrograms, and stochasticity was evaluated using null models. The turnover component was greater than nestedness for species and functional dissimilarity. Environmental dissimilarity, spatial distance, or time did not significantly explain species or functional dissimilarity. However, functional dissimilarity was significantly greater than expected given the observed species dissimilarity. The main finding of this study is that community assembly was deterministic with respect to traits. Further, each lake contributed similarly to the overall species and traits pool. These results highlight the importance of comparing species and functional dissimilarities to reach a better understanding of the organization of periphytic algal communities.

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Functional diversity and adaptative strategies of planktonic and periphytic algae in isolated tropical floodplain lake

Cited by 31 publications

References 29 publications

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

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

Functional diversity and functional traits of periphytic algae during a short-term successional process in a Neotropical floodplain lake

Patterns in species and functional dissimilarity: insights from periphytic algae in subtropical floodplain lakes

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