Efeito de diferentes níveis de enriquecimento por fósforo sobre a estrutura da comunidade perifítica em represa oligotrófica tropical (São Paulo, Brasil)

Ferragut, Carla; Bicudo, Denise C.

doi:10.1590/s0100-84042009000300015

Cited by 14 publications

(21 citation statements)

References 52 publications

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“…The increased periphytic algae diversity and nonoccurrence of competitive exclusion were reported in experiments with P? enrichment (Ferragut and Bicudo 2009). Considering that the periphytic community is primarily limited by P?…”

Section: Discussionmentioning

confidence: 99%

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Effect of N and P enrichment on periphytic algal community succession in a tropical oligotrophic reservoir

Ferragut

Bicudo

2011

Limnology

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This enrichment experiment was conducted to evaluate how nutrient availability drives colonization and succession of a periphytic algal community in a Brazilian tropical oligotrophic reservoir. Four treatments were designed using enclosures (n = 3): control (no nutrient addition), P? (isolated phosphorus addition, N-limiting condition); N? (isolated nitrogen addition, P-limiting condition), and NP? (phosphorus and nitrogen combined addition, no limitation). Glass microscope slides were used for periphyton growth. Samplings were carried out at short, regular intervals (3-5 days) over 31 days. Isolated P addition promoted the highest structural organization, and both NP? and P? promoted the highest biomass accrual. Control condition favored Chromulina elegans (chrysophyte) dominance, whereas enrichment favored different species descriptors belonging mainly to cyanobacteria (N?) and green algae (P?, NP?). Phosphorus was the main environmental driver in the community structural changes. All periphyton attributes were significantly affected by enrichments in the advanced successional stages, when species were strongly associated to different amendments. Periphytic algal community was quite sensitive to enrichments, allowing identification of successional sequences in each treatment; however, colonization time is relevant when monitoring strategies are considered.

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Section: Discussionmentioning

confidence: 99%

“…Considering that the periphytic community is primarily limited by P? (Vercellino and Bicudo 2006;Ferragut and Bicudo 2009), increased nutrient availability probably favored limiting the increase in complexity.…”

Section: Discussionmentioning

confidence: 99%

Effect of N and P enrichment on periphytic algal community succession in a tropical oligotrophic reservoir

Ferragut

Bicudo

2011

Limnology

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“…palea was one of the taxa abundant in the treatment with N+P addition. In experiment with the addition of nutrients in urban reservoir, Ferragut and Bicudo (2009) found that Nitzschia palea and Monoraphidium arcuatum were the most abundant species in the P treatment, while M. contortum was abundant in the N+P treatment. According to the author, Nitzschia palea was associated with greater phosphorus concentration.…”

Section: Cosmarium Regenesiimentioning

confidence: 99%

“…The structure of the periphytic algae communities can be altered by artificial addition of nutrients (Murakami and Rodrigues, 2009). In addition the species structure (chlorophytes and diatoms) were sensible to phosphorus availability and P-addition (Ferragut and Bicudo, 2009), showing that the phosphorus, especially, may be considered a driver of periphytic algae (Ferragut and Bicudo, 2009;Murakami and Rodrigues, 2009). Preliminary synthesis of the evaluation of nutrient limitation to algal growth reveal phosphorus as the most limiting element in reservoirs (Huszar et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Effects of nutrients enrichment on algal communities: an experimental in mesocosms approach

2011

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Aim:The effect of different concentrations of nutrients on algal communities living at the bottom of mesocosms was examined; Methods: The experiment was carried out in the tributary of Rosana reservoir (Corvo river) from November 22 nd to December 16 th of 2003. Mesocosms were set up in triplicate, with four treatments: nitrogen (N); phosphorus (P); nitrogen plus phosphorus (NP); plus a control treatment (C), consisting in addition of water from the reservoir; Results: Results of the Principal Components Analysis applied on the abiotic variables have shown that two axes explained 93.6% of the total variability (69.6 and 23.9%, respectively). It was possible to identify a group of P (positive) and N (negative) treatments of axis 1. The addition of nutrients in the experiment resulted in changes in algal composition. Mean values of density ranged from 8.383 to 34.510 ind.mL -1 . Higher densities occurred in the phosphorus and nitrogen plus phosphorus treatments. The most representative classes were Zygnemaphyceae, Chlorophyceae, Bacillariophyceae and Cyanobacteria, both in density and species richness; Conclusions: Phosphorus seems to be beneficial to green algae in general, since a marked increase in Zygnemaphyceae and Chlorophyceae was found in the treatments containing phosphorus and nitrogen plus phosphorus. In the nitrogen treatment, however, green algae decreased dramatically, while Cyanobacteria remained constant, indicating their capacity to live in changed environments and confirms the limiting role played by phosphorus on the algal groups.Keywords: benthic algal, phosphorus, nitrogen, Zygnemaphyceae, Chlorophyceae.Resumo: Objetivo: Este trabalho teve como objetivo avaliar a resposta das comunidades algais presente no sedimento de mesocosmos em diferentes concentrações de nutrientes; Métodos: O experimento foi realizado no afluente do reservatório de Rosana (rio do Corvo) no período de 22 de novembro a 16 de dezembro de 2003. Os mesocosmos foram preparados em triplicatas e em quatro tratamentos: (N) com adição de nitrogênio; (P) adição de fósforo; (NP) adição de nitrogênio + fósforo e o tratamento controle (C) com adição de água do reservatório; Resultados: Os resultados da Analise de Componentes Principais aplicados com dados abióticos mostram que os dois primeiros eixos explicaram 93,6% da variabilidade total dos dados (69,6 e 23,9%, respectivamente). Com isso foi possível identificar grupos de variáveis relacionadas ao tratamento com P (positivamente) e outro com nitrogênio (negativamente) no eixo 1. A adição dos nutrientes provocou alterações nos diferentes grupos de algas, com valores médios da densidade variando entre 8.383 to 34.510 ind.mL -1. Maior densidade foi observada no tratamento com P e NP, respectivamente. Zygnemaphyceae, Chlorophyceae, Bacillariophyceae e Cyanobacteria foram às classes mais representativas, tanto em densidade quanto em riqueza de espécies; Conclusões: O P parece beneficiar as algas verdes em geral, uma vez que no tratamento com P e com NP houve aumento acentuado...

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“…Their establishment in these environments is the outcome of complex interactions between many factors, such as disturbances (Biggs et al, 1998), nutrient availability (Ferragut and Bicudo, 2009;Dunck et al, 2013a), light (Tuji, 2000) and hydrodynamics (Algarte et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

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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Efeito de diferentes níveis de enriquecimento por fósforo sobre a estrutura da comunidade perifítica em represa oligotrófica tropical (São Paulo, Brasil)

Cited by 14 publications

References 52 publications

Effect of N and P enrichment on periphytic algal community succession in a tropical oligotrophic reservoir

Effect of N and P enrichment on periphytic algal community succession in a tropical oligotrophic reservoir

Effects of nutrients enrichment on algal communities: an experimental in mesocosms approach

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

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