Variability in Sea-Loch Phytoplankton

Tett, Paul; Grantham, Brian

doi:10.1007/978-1-4613-3105-6_40

Cited by 9 publications

(3 citation statements)

References 1 publication

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“…The contribution of measurement error to the scatter is likely to be 11 % of observed concentrations for chlorophyll (Tett & Grantham 1980) and 2 to 5 % for nitrate (Jones 1979) at the concentrations reported here. In many cases (see Fig.…”

Section: Discussionmentioning

confidence: 74%

Predicting marine eutrophication: the yield of chlorophyll from nitrogen in Scottish coastal waters

Gowen¹,

Tett²,

Jones³

1992

Mar. Ecol. Prog. Ser.

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There is perceived to be a problem of eutrophication in European marine coastal waters and hence a need to predict the response in terms of enhanced biomass of phytoplankton resulting from the input of anthropogenic nitrogen. This response was investigated indirectly by studying the relationship between nitrate and phytoplankton chlorophyll concentrations in waters of the Scottish west coast. Two-thirds of the 60 data sets analysed gave significant inverse regressions of chlorophyll on nitrate concentration. This result is explained by interpreting synoptic data as representing variation in time, with nitrate decreasing as a result of its assimilation by phytoplankton and conversion into chlorophyll-containing biomass Thus the absolute value of the slope of each significant regression estimates the yield (g) of chlorophyll from nitrate and, indeed, from any form of nitrogen assimilable by microalgae. The median value for q was 1.05 mg chl (mm01 N ) -' ; the range from 0.25 to 4.4 encompassed 95 % of values. Some, but not all, of the variation in q could be explained by error in individual estimates due to chemical-analytical and sampling errors or to inhomogeneities in each sampled phytoplankton population. The remaining variation in q included a seasonal trend, which might have resulted from changes in phytoplankton species composition, nutrient limitation status, or the balance between autotrophic and heterotrophic partitioning of nitrogen. It is suggested that an appropriate value of q can be used to predict the potential maximum increase in phytoplankton which would result from a given anthropogenic nitrogen discharge. The sensitivity of such predictions to error in determination of q is discussed, and the values obtained for q compared with observations in algal culture and mesocosms.

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Section: Discussionmentioning

confidence: 74%

Predicting marine eutrophication: the yield of chlorophyll from nitrogen in Scottish coastal waters

Gowen¹,

Tett²,

Jones³

1992

Mar. Ecol. Prog. Ser.

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“…The first set comprised observations made in 1975 (Jones 1979), analyzed by Laurent et al (2006). The second set was 1970s climatological envelopes for chlorophyll Wallis 1978, Tett andGrantham 1980) and dissolved nutrients (from Jones 1979).…”

Section: Model Validationmentioning

confidence: 99%

Mussels and Yachts in Loch Fyne, Scotland: a Case Study of the Science-Policy Interface

Tett¹,

Valcic²,

Potts³

et al. 2012

E&S

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ABSTRACT. We report an application of the Science and Policy Integration for Coastal System Assessment (SPICOSA) Systems Approach Framework (SAF) to Loch Fyne, a fjord in western Scotland. The issue was the potential for conflict between shellfish aquaculture and recreational use for yachting. This was investigated by building an ecological-economic model to simulate: (1) release of modern anti-fouling compounds by recreational boats; (2) dilution of these in the upper layers of the loch by exchange with the sea; (3) their effects on photosynthesis by phytoplankton; (4) the role of phytoplankton (along with non-algal particulate matter) in providing food for mussels; (5) the growth of seeded mussels to harvest, determining (6) the cash input to farms, offset by their costs and allowing (7) the farm revenue to be compared with that from marinas used to berth the yachts. It was concluded from simulations that no noticeable effect on mussel harvest would occur (from this route) for any likely number of yachts berthed in the loch. The application took place in consultation with a local environmental forum and a small reference group of public officials; we reflect on it in the context of a 3-component schema for the science-policy interface and changes in the culture of UK science.

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“…It seems likely that these non-photosynthetic pigments are involved in the synthesis and breakdown of chlorophyll (Bogorad, 1965;Holden, 1966) and there is some evidence to suggest that changes in the proportions of these pigments accompany changes in the physiological state of the algae (Jensen & Sakshaug, 1973)-As well as being of interest in themselves, such changes in the pigment composition of phytoplankton might affect estimates of algal biomass and productivity, since the measurement of photosynthetic pigments (UNESCO, 1966) is often used to estimate these two parameters. The seasonal cycle of phytoplankton biomass and photosynthesis has been described for the two f jordic sea-lochs Creran and Etive largely in terms of chlorophyll estimates of biomass (Wood, Tett & Edwards, 1973;Tett & Wallis, 1978;Tett & Grantham, 1980) using a fluorescence method (Strickland & Parsons, 1972) that does not distinguish between the phytylated and non-phytylated dihydroporphyrins.…”

Section: Introductionmentioning

confidence: 99%

Changes in the major dihydroporphyrin plankton pigments during the spring bloom of phytoplankton in two Scottish sea-lochs

1983

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A chromatographic/fluorcmetric method was used to measure changes in the proportions of four planktonic dihydroporphyrin pigments during the spring bloom of 1979 in two f jordic sea-lochs, Creran and Etive, on the west coast of Scotland. Very little pheophytin a was detected during the bloom. Chlorophyll a, and to a lesser extent chlorophyllide a, were the two main pigments found during the bloom. During senescence the main pigment breakdown route appeared to be via chlorophyllide a to pheophorbide a. These results suggest that standard methods for measurement of ‘chlorophyll’ which do not distinguish between chlorophyll a and chlorophyllide a might significantly over-estimate the photosynthetic potential of phytoplankton.

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Variability in Sea-Loch Phytoplankton

Cited by 9 publications

References 1 publication

Predicting marine eutrophication: the yield of chlorophyll from nitrogen in Scottish coastal waters

Predicting marine eutrophication: the yield of chlorophyll from nitrogen in Scottish coastal waters

Mussels and Yachts in Loch Fyne, Scotland: a Case Study of the Science-Policy Interface

Changes in the major dihydroporphyrin plankton pigments during the spring bloom of phytoplankton in two Scottish sea-lochs

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