Phosphorus inactivation in a eutrophic lake by the direct addition of ferric aluminium sulphate changes in phytoplankton populations

Foy, R. H.; Fitzsimons, A. G.

doi:10.1111/j.1365-2427.1987.tb01024.x

Cited by 18 publications

(8 citation statements)

References 15 publications

(25 reference statements)

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“…When silica is exhausted, the intrinsic settling rate of the cells increases and this, combined with the inability of the cells to divide, means that the cells disappear from the water column in an exponential manner (Gibson, 1984). In stratified lakes such as White Lough (Foy & Fitzsimons, 1987), the onset of stratification with consequent reduction of mixed depth is also an important factor influencing the loss of diatoms from the water column, as classically demonstrated by Lund (1954) for Aulacoseira subarctica in Blelham Tarn.…”

Section: Discussionmentioning

confidence: 94%

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

Gibson¹,

Foy²,

Bailey‐Watts³

1996

Freshwater Biology

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1. Total phosphorus (TP) cycles were examined in seventeen lakes from the Scottish lowlands and Northern Ireland, which varied in annual mean TP from 17 to 192 pg P 1-*. 2. It is clear from the data that the annual range of TP concentrations increases as the annual maximum TP increases. Although the annual minimum TP increases somewhat with increasing annual maxima, even enriched lakes show a pronounced TP minimum. As a result, the annual maximum values are highly correlated with the ranges and means, but less so with the annual minima. 3. The data are discussed in relation to a conceptual sine wave model and it is suggested that enrichment modulates the amplitude of the sine wave. 4. Mechanisms conditioning the maximum and minimum values are reviewed.

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Section: Discussionmentioning

confidence: 94%

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

Gibson¹,

Foy²,

Bailey‐Watts³

1996

Freshwater Biology

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“…a -20-40 a l-1) deplete SRP prior to the spring diatom crop (cf. Foy & Fitzsimons, 1987). Similarly, some of the diatoms in the data set commonly occur during summer (Fragilaria crotonensis, Aulacoseira granulata).…”

Section: Diatom-inferred P: Interpretation and Error Sourcesmentioning

confidence: 99%

A comparison of sedimentary and diatom-inferred phosphorus profiles: implications for defining pre-disturbance nutrient conditions

Anderson

Rippey²,

Gibson³

1993

Hydrobiologia

131

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Interpreting sedimentary phosphorus profiles in terms of changes in the historical P load is difficult due to variable retention and post-depositional diagenesis. An alternative approach is to use diatom assemblages in surface sediments and derive a transfer function for epilimnetic SRP and total P concentrations using weighted average regression and calibration. The obtained relationship can then be applied to down-core changes in sedimentary diatom assemblages and diatom-inferred P (DI-P) used to assess historical changes in epilimnetic P-concentrations. A diatom-phosphorus calibration data set for 43 eutrophic lakes in Northern Ireland has been constructed and applied to two small eutrophic lakes (Lough Mann, White Lough). DI-total P (i.e. predicted) is highly correlated with observed TP (r 2 = 0.75) for the surface-sediment training data-set. The resultant changes in DI-P derived from application of the transfer function to down-core changes in diatom assemblages are compared to sedimentary P concentrations. The latter are highly variable, presumably due to redox-derived effects, while DI-P profiles are more readily interpretable, and agree with other stratigraphic records of lake eutrophication. The method offers a good possibility of defining pre-disturbance (i.e. natural) phosphorus concentrations in lakes with associated implications for lake-restoration programmes.

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“…However, partitioning of the P pool within the lake may induce P limitation of diatom growth. From 1980 to 1983, when the phytoplankton was perpetually dominated by the slow‐growing O. agardhii var isothrix , P incorporated into this species ensured that DRP was <5 μg P L −1 during winter and spring despite average TP concentrations 43 μg P L −1 (Foy & Fitzsimons, 1987). Under these conditions of low late winter DRP, the diatom spring crop barely utilised 50% of the available DRS (Table 1).…”

Section: Resultsmentioning

confidence: 99%

“…In subsequent years, 1981–83, uptake of DRS by an overwintering diatom population dominated by Synedra acus Kutz. lowered the late winter maxima to 3.3–3.9 mg SiO 2 L −1 (Foy & Fitzsimons, 1987). The diatom bloom of 1979 was dominated by Stephanodiscus hantzschii Grun.…”

Section: Study Site Limnology and Documentary Datamentioning

confidence: 99%

Climate forcing of diatom productivity in a lowland, eutrophic lake: White Lough revisited

et al. 2012

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Summary 1. In cultural landscapes, lake response to climate can be masked by land‐use change and nutrient loss from their catchments. Palaeolimnological methods were used to reconstruct the ecological response of diatoms in a eutrophic lowland lake (White Lough, Co. Tyrone, Northern Ireland) to altered nutrient P loading and precipitation variability over c. 100 years. 2. 210Pb‐dated sediment cores were analysed to determine diatom assemblage variability, biogenic silica concentration, geochemical phosphorus concentration and accumulation rate. Manure P and agricultural N surplus data were collated from documentary sources. Long‐term trends in annual temperature and precipitation were derived from the Armagh Observatory. 3. Diatom community turnover from 1890 until c. 1960 was limited, and assemblages were dominated by Aulacoseira subarctica; after this date, changes primarily reflected a eutrophication sequence owing to increased diffuse nutrient inputs associated with intensification of land use (external P loading increased by a factor of three). 4. Diatom and biogenic Si profiles were compared with North Atlantic Oscillation (NAO) records, an index of regional weather patterns. Biogenic Si exhibited a c. 7‐year cycle, which tracked a cycle of similar timescale in the Armagh climate record for dry summers. In turn, this cycle was related to the variation in the NAO. 5. Monitoring data from 1971 to 2007 of nitrate exports from the Blackwater River showed that these too followed a roughly 7‐year cycle at least up to 2000, in which dry summers were followed by sharp increases in nitrate export. It is argued that diatom production in White Lough reflects the cyclic behaviour in nitrate loading and the constraints that nitrogen availability places on the spring diatom bloom in a lake that is dominated by cyanobacteria.

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Phosphorus inactivation in a eutrophic lake by the direct addition of ferric aluminium sulphate changes in phytoplankton populations

Cited by 18 publications

References 15 publications

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

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

A comparison of sedimentary and diatom-inferred phosphorus profiles: implications for defining pre-disturbance nutrient conditions

Climate forcing of diatom productivity in a lowland, eutrophic lake: White Lough revisited

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