Impact of Nutrients and Physical Factors on the Shift from Cyanobacterial to Chlorophyte Dominance in Shallow Danish Lakes

Jensen, Jens Peder; Jeppesen, Erik; Olrik, Kirsten; Kristensen, Peter

doi:10.1139/f94-170

Cited by 311 publications

(248 citation statements)

References 18 publications

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“…In Xiangxi Bay of the TGR, the biomass of G group reached its maximum of 80.0 mg/L on May 23, 2008, when the concentration of PO 4 -P reached the maximum in the study period as 0.32 mg/L. Jensen et al (1994) explained the selection of chlorophytes at the highest phosphorus concentration by the continuous input of nutrients and carbon from the external loading and the sediment in shallow lakes that favoured the fast-growing species (Romo and Villena 2005). Lo groups include large dinoflagellates usually found in summer epilimnia in mesotrophic lakes with segregated nutrients and without prolonged or deep mixing .…”

Section: Discussionmentioning

confidence: 91%

Weekly dynamics of phytoplankton functional groups under high water level fluctuations in a subtropical reservoir-bay

Wang

Cai

et al. 2010

Aquat Ecol

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In reservoirs, water level fluctuations strongly influence phytoplankton development. However, studies on the response of phytoplankton in the reservoir-bay to water level fluctuations are very scarce, especially in the highly dynamic reservoir system, for instance, the Three Gorges Reservoir (TGR) on the Yangtze River in China. Therefore, we carried out weekly monitoring in a typical tributary bay-Xiangxi Bay of the TGR from March 2008 to March 2009 analyze the dynamics of phytoplankton functional groups, as well as their response to the water level fluctuations and other environmental conditions. The phytoplankton functional groups G (short, nutrient-rich water columns with high light and without nutrient deficiency), M (dielly mixed layers of small eutrophic, low latitude with high insolation and without flushing and low total light) and Lo (summer epilimnia in mesotrophic lakes with segregated nutrients and without prolonged or deep mixing) were the most important in biomass, mainly represented by Pandorina morum and Eudorina elegans, Microcystis aeruginosa, Peridiniopsis niei and Ceratium hirundinella, respectively. The dominant functional groups had close relationships with the water level fluctuations, light and nutrient, etc. Principal components analysis and redundancy analysis indicated that phytoplankton functional groups in Xiangxi Bay were restricted by the mixing regime and other abiotic variables under the influences of the mixing regime. In Xiangxi Bay, the water level fluctuation showed significant correlations with many physicochemical variables, including the mixing depth (r = 0.97, p \ 0.001) and the relative water column stability (r = -0.80, p \ 0.001). The study implied that water level fluctuations had complex influence on environmental changes and selecting for phytoplankton functional groups in a highly dynamic reservoir-bay. The important characteristics of the dominant phytoplankton functional groups in Xiangxi Bay were also discussed.

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Section: Discussionmentioning

confidence: 91%

Weekly dynamics of phytoplankton functional groups under high water level fluctuations in a subtropical reservoir-bay

Wang

Cai

et al. 2010

Aquat Ecol

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“…All significances at P \ 0.05, corrected for multiple pairwise comparisons using the Bonferroni method , 2012), whereas the PTI is specifically calibrated to TP . Moreover, in shallow lakes cyanobacteria are substituted by green algae at the highest nutrient levels (Jensen et al, 1994).…”

Section: Discussionmentioning

confidence: 99%

Ecological status assessment of European lakes: a comparison of metrics for phytoplankton, macrophytes, benthic invertebrates and fish

et al. 2013

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Data on phytoplankton, macrophytes, benthic invertebrates and fish from more than 2000 lakes in 22 European countries were used to develop and test metrics for assessing the ecological status of European lakes as required by the Water Framework Directive. The strongest and most sensitive of the 11 metrics responding to eutrophication pressure were phytoplankton chlorophyll a, a taxonomic composition trophic index and a functional traits index, the macrophyte intercalibration taxonomic composition metric and a Nordic lake fish index. Intermediate response was found for a cyanobacterial bloom intensity index (Cyano), the Ellenberg macrophyte index and a multimetric index for benthic invertebrates. The latter also responded to hydromorphological pressure. The metrics provide information on primary and secondary impacts of eutrophication in the pelagic and the littoral zone of lakes. Several of these metrics were used as common metrics in the intercalibration of national assessment systems or have been incorporated directly into the national systems. New biological metrics have been developed Hydrobiologia (2013) 704:57-74 DOI 10.1007/s10750-012-1436 to assess hydromorphological pressures, based on aquatic macrophyte responses to water level fluctuations, and on macroinvertebrate responses to morphological modifications of lake shorelines. These metrics thus enable the quantification of biological impacts of hydromorphological pressures in lakes.

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“…Experimentalmente, Ferragut (1999) reportou que a alta disponibilidade de fósforo favoreceu a substituição de crisofíceas por clorofíceas no perifíton. Outros estudos também demonstraram o aumento de clorofíceas perifíticas como conseqüência do processo de eutrofi zação (Jensen et al 1994, Biggs 1996 e do aporte de fósforo (Havens et al 1999).…”

Section: Discussionunclassified

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

Ferragut¹,

Bicudo²

2009

Rev. bras. Bot.

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-(Effect of different levels of phosphorus enrichment on periphyton community structure in a tropical oligotrophic reservoir (São Paulo, Brazil)). Nutrient diffusing substrata (NDS) were used to determine the effect of added phosphorus on the periphyton development in a shallow reservoir (Lago do IAG, PEFI, São Paulo). Three treatments (n = 2) were designed: control (without phosphorous addition) and two levels of phosphorus addition (P 1 = 0.1 M and P 2 = 0.5 M KH 2 PO 4 ). NDS surface was covered with a 20 μm mesh cloth for periphyton growth. Samplings were carried at 15, 20, 25 and 30 days of colonization. Biomass accumulation (organic matter, chlorophyll-a, total algal biovolume) and total algal density did not show signifi cant response to nutrient addition. Seven species of chlorophytes and one of diatoms were closely associated to P availability. Periphyton nutrient status (P%, N%, N:P) demonstrated P-limitation as well as reinforced periphyton P retention capacity. Periphyton attributes were more sensible to P enrichment than to the different addition levels, indicating further N-limitation. Comparison with previous data indicated temporal (1996)(1997)(1998)(1999)(2000)(2001)(2002) increase in the reservoir phosphorus availability, although P-limitation is still prevalent. Periphyton, on the basis of its nutrient status and species structure, was sensible to temporal shift on phosphorus availability and P-addition, reinforcing its potential as an evaluating tool for early signs of eutrophication.Key words -algae, environmental descriptors, periphyton, phosphorus, reservoir RESUMO -(Efeito de diferentes níveis de enriquecimento por fósforo sobre a estrutura da comunidade perifítica em represa oligotrófi ca tropical (São Paulo, Brasil)). Substrato difusor de nutrientes (SDN) foi utilizado para determinar o efeito da adição de fósforo sobre o desenvolvimento do perifíton em uma represa rasa (Lago do IAG, PEFI, São Paulo). Três tratamentos (n = 2) foram delineados: controle (sem adição de fósforo) e dois com adição de fósforo (P 1 = 0,1 M e P 2 = 0,5 M KH 2 PO 4 ). A superfície dos SDN foi revestida com malha de 20 μm para crescimento do perifíton. Coletas foram realizadas nos 15 o , 20 o , 25 o e 30 o dias de colonização. A acumulação de biomassa (massa orgânica, clorofi la-a, biovolume total de algas) e de densidade total de algas não forneceu resposta signifi cativa ao enriquecimento. Seis espécies de clorofíceas e uma de diatomáceas associaram-se à disponibilidade de fósforo. O estado nutricional do perifíton (%P, %N, N:P) demonstrou a limitação pelo fósforo, bem como reforçou a capacidade da comunidade na retenção do fósforo. Os atributos do perifíton foram mais sensíveis ao enriquecimento pelo fósforo, do que aos níveis de adição, indicando que a comunidade passou a ser limitada pelo nitrogênio. A comparação com dados anteriores indicou aumento temporal (1996-2002) da disponibilidade de fósforo na represa, embora ainda prevalecendo condição P-limitante. O perifíton, por meio de seu estado nutr...

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Impact of Nutrients and Physical Factors on the Shift from Cyanobacterial to Chlorophyte Dominance in Shallow Danish Lakes

Cited by 311 publications

References 18 publications

Weekly dynamics of phytoplankton functional groups under high water level fluctuations in a subtropical reservoir-bay

Weekly dynamics of phytoplankton functional groups under high water level fluctuations in a subtropical reservoir-bay

Ecological status assessment of European lakes: a comparison of metrics for phytoplankton, macrophytes, benthic invertebrates and fish

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

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