Planktonic diatoms and some diatom‐silica relations in a shallow eutrophic Scottish loch

Bailey‐Watts, A. E.

doi:10.1111/j.1365-2427.1976.tb01592.x

Cited by 64 publications

(27 citation statements)

References 43 publications

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“…Two measurements were made for each valve (four per cell) at the point of maximum thickness. The estimates of the silica required by A. baicalensis were based on the data of Einsele & Grim (1938), which have been shown by various authors (Lund, 1950;Bailey-Watts, 1976;Gibson, 1981) to give useful approximations for the relationship between the thickness of cell walls and their SiO 2 content. Irradiances were measured with Li-Cor Ll-185B and Ll-190SB quantum sensors (Li-Cor Inc., Nebraska, USA).…”

Section: Methodsmentioning

confidence: 99%

Vertical mixing, size change and resting stage formation of the planktonic diatomAulacoseira baicalensis

Jewson

Granin

Zhdarnov

et al. 2010

European Journal of Phycology

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Aulacoseira baicalensis (K. Meyer) Simonsen is a freshwater planktonic diatom that undergoes large seasonal changes in cell morphology related to changes in vertical mixing. Short cells (10-20 mm) with thin walls were formed under the ice of Lake Baikal but cell lengths increased up to 150 mm by the time mixing depth reached over 100 m in June. These long cells became resting stages that were packed with reserve products and had siliceous walls up to 4 mm thick. Increase in mixing depth gave access to sufficient silica for completion of resting stages in most years but not in high biomass years, which has long-term implications for the population. Wall thickening reduced the risk of dissolution during dormancy but it also reduced cell volume. Therefore, by increasing length, cells maintained storage space for reserves. Seasonal changes in valve length showed that individual valves did not last more than 6 months, equivalent to 5 to 10 divisions. Separation valves were important in determining the number of cells per filament during spring growth but cell breakage became more important during summer dormancy. Resting stages survived in cool, intermediate depths (50-150 m) during summer stratification and were returned to the surface during autumn overturn.

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Section: Methodsmentioning

confidence: 99%

Vertical mixing, size change and resting stage formation of the planktonic diatomAulacoseira baicalensis

Jewson

Granin

Zhdarnov

et al. 2010

European Journal of Phycology

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“…Bailey-Watts et al, 1990) with a direct bearing on the main topic of this paper, the loch ranks as one of the best-documented in the world. The loch is also special with respect to areas of aquatic science that have been investigated only rarely or not at all elsewhere in the UK: nutrient loadings (Bailey-Watts and Kirika, 1987; Bailey-Watts et al, 1987), nutrient and phytoplankton dynamics over timescales of weeks to decades (Holden and Caines, 1974;Bailey-Watts, 1974, 1978; Bailey-Watts et al, 1990), zooplankton populations, including rotifers (May et al, 1993), and the discovery of various new species, such as a fungal parasite (Canter, 1971), an algophilous protozoan (Canter, 1973;Bailey-Watts and Lund, 1973) and a blue-green alga (Bailey-Watts and Komarek, 1991). The whole amounts to an extensive literature on a shallow system, the functioning of which contrasts markedly with that of the deeper, stratifying waters on which many classic limnological principles are based.…”

Section: Introductionmentioning

confidence: 99%

“…Codd, 1984), dense populations of species that form surface scums under suitably calm conditions are unsightly and often smelly. Along with any algae present in sufficient numbers to cloud the water (and Bailey-Watts (1974, 1978 cites examples of green algae and diatoms as well as cyanobacteria), these growths have been implicated in the die-back and reduction in species diversity of rooted macrophyte populations (Jupp et al , 1974) and, apparently, consequential reductions in the variety of species of a wide range of invertebrate groups (Morgan, 1970). Eutrophication has also been implicated in the disappearance of the charr, Salvefinus alpinus (L.), from this loch (Maitland and Lyle, 1991).…”

Section: Introductionmentioning

confidence: 99%

Phosphorus fractionation and mobility in Loch Leven sediments

Farmer¹,

Bailey‐Watts²,

Kirika³

et al. 1994

Aquatic Conservation

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ABSTRACT1. This paper reports on the application of a chemical fractionation scheme for assessing the amounts, forms and potential mobility (recycling potential) of phosphorus in the sediments of the freshwater Loch Leven, which is currently highly topical in relation to eutrophication and its manifest dense, potentially toxic, blue-green algae. The findings are placed in the context of the biological importance of the loch, the problems it is experiencing and some management options for its restoration.2. The fractionation scheme adopted enabled quantification of phosphorus in sediment pore water and in sedimentary solid phases classified as 'loosely-bound', 'reductant-soluble', 'oxide-adsorbed', 'organic', 'apatite-bound' and 'residual' in the sections of a 16-cm core collected in January 1990.3. Vertical profiles of reductant-soluble and pore water phosphorus and iron show redox-controlled remobilization and cycling within the sediment to be the principal mechanisms leading to the surface sediment enrichment of phosphorus observed during the winter months.4. The association of phosphorus with iron oxyhydroxides in the reductant-soluble fraction, which accounts for 31% of the total phosphorus (2470 mg kg-I) in the 0-1 cm section compared with 0.5% loosely-bound, 25.6% oxide-adsorbed, 27.9% organic, 9.9% apatite-bound and 5.1 Yo residual, restricts the release of phosphorus to the overlying water column in winter.5 . Extrapolation of the data to the whole loch suggests that in early 1990 more than 40 tonnes of phosphorus were associated with the surfaces of iron oxyhydroxides in the upper 10 cm of Loch Leven sediment, about five times that required to raise loch water concentrations to maxima of 0.15 mg L-I observed during the algal blooms of summer under conditions favourable to the release of phosphorus from the sediments.6. Despite recent measures to reduce external inputs of phosphorus and thereby limit the degree of eutrophication of Loch Leven, there appears to have been little overall change in the inventory of phosphorus associated with iron in the upper 10 cm of sediment since 1970.7. There should be more detailed seasonal and spatial studies of the chemical fractionation and mobility of phosphorus in Loch Leven sediments to investigate the extent to which release from the reductant-soluble iron oxyhydroxide fraction (internal loading) contributes to the highly elevated phosphorus concentrations in loch water during summer.

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“…l -1 . High concentrations of Silica during July, August and January seemed to be important for their growth (Bailey-Watts, 1976). Seasonal succession of algae in Lake Pamvotis is a complicated succession, as it happens in many shallow, productive lakes (Hutchinson, 1967).…”

Section: Discussionmentioning

confidence: 99%

Water chemistry and biology in a shallow lake (Lake Pamvotis - Greece). Present state and perspectives

2013

Global NEST Journal

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Lake Pamvotis is a shallow lake, located in NW Greece, which during last decades has influenced by a lot of man-made impacts such as sewage discharge, water level fluctuation, e.t.c. Water quality for physicochemical and biological parameters was monitored seasonally in five sampling-stations from April 1998 to March 1999. Lake Pamvotis is an eutrophic ecosystem which has been influenced by the nutrients input, rates of nutrient cycling and plankton-fish dynamics. According to the nitrogen: phosphorus ratio, the limiting factor is phosphorous during spring while a nitrogen limitation is switched on during the warm season. Restoration management strategy requires reduction of external organic load, control of non-point pollution from the surrounding agricultural area and establishment of biomanipulation techniques.

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Planktonic diatoms and some diatom‐silica relations in a shallow eutrophic Scottish loch

Cited by 64 publications

References 43 publications

Vertical mixing, size change and resting stage formation of the planktonic diatomAulacoseira baicalensis

Vertical mixing, size change and resting stage formation of the planktonic diatomAulacoseira baicalensis

Phosphorus fractionation and mobility in Loch Leven sediments

Water chemistry and biology in a shallow lake (Lake Pamvotis - Greece). Present state and perspectives

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