An analysis of the total phosphorus cycle in some temperate lakes: the response to enrichment

Gibson, C. E.; Foy, R. H.; Bailey‐Watts, A. E.

doi:10.1111/j.1365-2427.1996.tb01766.x

Cited by 37 publications

(28 citation statements)

References 18 publications

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“…This observation is in contrast to those made about diatom-nutrient relationships where it is has been observed that increases in concentration are associated with substantial increases in range (e.g. Gibson et al, 1996cited in Anderson, 1997.…”

Section: Assessment Of Hypothesiscontrasting

confidence: 79%

Diatom–salinity relationships in wetlands: assessing the influence of salinity variability on the development of inference models

et al. 2007

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Diatoms are among the most widely used indicators of human and climate induced wetland salinity history in the world. This is particularly as a result of the development of diatom-based models for inferring past salinity. These models have primarily been developed from relationships between diatoms and salinity measured at the time of sampling or during the preceding year. Although within site variation in salinity has the potential to reduce the efficacy of such models, its influence has been rarely considered. Hence, diatom-conductivity relationships in eight seasonally monitored wetlands have been investigated. In developing a diatom-conductivity transfer function from these sites, we sought to assess the influence of conductivity variation on diatom inference model performance. Our sites were characterised by variability in conductivity that was not correlated to its range and thus were well suited to an investigation of this type. We found, contrary to expectations, that short-term (seasonal) changes in conductivity which were often dramatic did not result in unduly reduced transfer function performance. By contrast, sites that were more variable in the medium term (5-6 years) tended to have larger model errors. In addition, we identified a secondary ecological gradient in the diatom data which could not be related to any measured variable (including pH, turbidity or nutrient concentrations).

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Section: Assessment Of Hypothesiscontrasting

confidence: 79%

Diatom–salinity relationships in wetlands: assessing the influence of salinity variability on the development of inference models

et al. 2007

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“…in Finnish lakes a 10-year summer average is used) and also seasonal changes in values are not available in this dataset. Gibson et al (1996) indicate that these seasonal variations can be an important factor in the analyses of the interannual trends in trophic status in shallow lakes. Although the general response of well known indicator species seems to hold, there are many species that are classified differently according to the database selection and classification methods.…”

Section: Discussionmentioning

confidence: 98%

Classifying aquatic macrophytes as indicators of eutrophication in European lakes

Penning

Mjelde

Dudley³

et al. 2008

Aquat Ecol

143

115

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Aquatic macrophytes are one of the biological quality elements in the Water Framework Directive (WFD) for which status assessments must be defined. We tested two methods to classify macrophyte species and their response to eutrophication pressure: one based on percentiles of occurrence along a phosphorous gradient and another based on trophic ranking of species using Canonical Correspondence Analyses in the ranking procedure. The methods were tested at Europe-wide, regional and national scale as well as by alkalinity category, using 1,147 lakes from 12 European states. The grouping of species as sensitive, tolerant or indifferent to eutrophication was evaluated for some taxa, such as the sensitive Chara spp. and the large isoetids, by analysing the (nonlinear) response curve along a phosphorous gradient. These thresholds revealed in these response curves can be used to set boundaries among different ecological status classes. In total 48 taxa out of 114 taxa were classified identically regardless of dataset or classification method. These taxa can be considered the most consistent and reliable indicators of sensitivity or tolerance to eutrophication at European scale. Although the general response of well known indicator species seems to hold, there are many species that were evaluated differently according to the database A. Kolada selection and classification methods. This hampers a Europe-wide comparison of classified species lists as used for the status assessment within the WFD implementation process.

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“…Although there is substantial published research on the role of organic C in microbial community dynamics, there is less research on the coupling of organic C with the phosphorus cycle, including production of microbial phosphatases, a potentially significant source of phosphate remineralization, especially in aquatic environments (Gibson et al, 1996;Dyhrman et al, 2007;Duhamel and Moutin, 2009;Ruttenberg and Dyhrman, 2012;Duhamel et al, 2014). Because of the potential threats from global warming, considerable research has been done on the coupling of nitrogen and carbon cycles, largely in relation to the effect of nitrogen on primary production, thus enhancing CO 2 sequestration (Esser et al, 2011;Zaehle, 2013).…”

Section: Introductionmentioning

confidence: 99%

Evidence for Coupling of the Carbon and Phosphorus Biogeochemical Cycles in Freshwater Microbial Communities

Anderson

2018

Front. Mar. Sci.

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Considerable attention has been given to the roles of the carbon and phosphate cycles in aquatic environments, but less attention has been given to an experimental analysis of the coupling of the C and P cycles in freshwater and marine ecosystems. Using laboratory microcosm experiments, prepared with natural pond-water microbial communities, evidence is presented for the coupling of dissolved organic C with microbial production of alkaline phosphatase driving the phosphorus cycle in freshwater microbial communities. The effects of glucose C-supplementation in microcosm microbial communities (including bacteria and heterotrophic nanoflagellates) on gains in microbial C-content and alkaline phosphatase activity (APA) were estimated in relation to control microcosms without C-supplementation. The C-supplementation increased total microbial APA (pmol min −1 µg −1 bacterial C) in the C-supplemented treatment (6.5 ± 0.6) compared to the non-supplemented cultures (5.1 ± 1.7). Microbial-bound APA in the C-supplemented treatment was particularly enhanced (4.4 ± 0.9) compared to control cultures (1.3 ± 0.8), but the amount of free (soluble) APA in the aquatic phase was less compared to the controls (n = 5, p < 0.001). Alkaline phosphatase activity was highly correlated (r = 0.97) with bacterial densities in the C-supplemented cultures, further supporting the hypothesis that C-supplementation can increase phosphorus remineralization through elevated production of microbial alkaline phosphatase. This laboratory-based, experimental study suggests that additional research on the coupling of the C and P cycles in freshwater and marine environments may yield productive insights into the finer details of the roles of these two biogeochemical cycles in aquatic microbial community dynamics.

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An analysis of the total phosphorus cycle in some temperate lakes: the response to enrichment

Cited by 37 publications

References 18 publications

Diatom–salinity relationships in wetlands: assessing the influence of salinity variability on the development of inference models

Diatom–salinity relationships in wetlands: assessing the influence of salinity variability on the development of inference models

Classifying aquatic macrophytes as indicators of eutrophication in European lakes

Evidence for Coupling of the Carbon and Phosphorus Biogeochemical Cycles in Freshwater Microbial Communities

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