Diatom succession related to land use during the last 6000 years: a study of a small eutrophic lake in southern Sweden

Håkansson, Håkan; Regnéll, Joachim

doi:10.1007/bf00210057

Cited by 21 publications

(13 citation statements)

References 16 publications

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“…The replacement of C. dubius by S. parvus after about 1937 would seem to indicate an acceleration of the eutrophication process. This change has been observed in other nutrient‐enriched shallow lakes (Fritz, 1989; Håkansson & Regnéll, 1993; Anderson, 1997b) and, in Groby Pool, relates to the installation of a small sewage treatment works discharging into the Slate Brook from approximately 1935.…”

Section: Discussionmentioning

confidence: 99%

Problems with the application of diatom‐total phosphorus transfer functions: examples from a shallow English lake

Sayer

2001

Freshwater Biology

112

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1. A diatom‐total phosphorus transfer function has been applied to a sedimentary diatom sequence from Groby Pool, a small shallow lake in Leicestershire, U.K. 2. Extensive aquatic plant records exist for Groby Pool dating back over two centuries. These records, in conjunction with selected aquatic pollen and herbarium diatom data, provide independent, qualitative evidence for the progression of eutrophication and its effects on aquatic plant communities and habitat structure. 3. Before 1800, Groby Pool was probably mesotrophic with clear water and a diverse submerged macrophyte community, but subsequently it experienced considerable nutrient enrichment. Key evidence for this includes: (i) historical plant records indicating the loss of species associated with mesotrophic waters and their replacement by others typical of eutrophic conditions, (ii) a significant increase in the percentage of planktonic diatoms in the lake sediment record (particularly Cyclostephanos dubius) after 1890, and (iii) increases in percentages of Stephanodiscus parvus and Cocconeis placentula in the second half of the twentieth century. 4. Diatom‐inferred total phosphorus (DI‐TP) estimates were inconsistent with the qualitative evidence for eutrophication at Groby Pool. In particular the DI‐TP profile was thought to overestimate phosphorus during the period of dominance by small Fragilaria spp. before 1890, and to misjudge the timing and direction of subsequent changes in nutrient loading. 5. This study highlights some of the problems associated with the application of diatom‐TP transfer functions to sedimentary diatom sequences from shallow lakes. The major problem relates to the frequent dominance of non‐planktonic diatoms in the sediments of these systems, many species of which (particularly small Fragilaria spp.) appear to be more sensitive to changes in habitat availability than to phosphorus. Potential ways of improving diatom‐TP models via altered approaches to sampling are suggested.

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Section: Discussionmentioning

confidence: 99%

Problems with the application of diatom‐total phosphorus transfer functions: examples from a shallow English lake

Sayer

2001

Freshwater Biology

112

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“…are dominant. Stephanodiscus species and Cyclostephanos dubius are indicators of highly eutrophic lakes (Anderson, 1990b(Anderson, , 1997Anderson et al, 1993;Hå kansson & Regnell, 1993;Bradshaw, 2005).…”

Section: Diatom Assemblages In Surface Sediment Samplesmentioning

confidence: 99%

Diatom assemblages in sediments of Lake Juusa, Southern Estonia with an assessment of their habitat

Punning

Puusepp

2007

Hydrobiologia

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Diatom analysis of surface sediments and two sediment cores from different sedimentation areas of a small closed lake was undertaken with the aim of acquiring knowledge on the dependence of the distribution of diatom assemblages on lake bathymetry. Lake Juusa was selected for the study because we have for this lake a large data set about the lithological composition of sediments and macrofossil and cladoceran records for the Holocene. A high carbonate content (20-60%) in the sediment sequence indicates high carbonacity and relatively stable pH values during the Holocene. On the basis of comprehensive analysis, abrupt water-level fluctuations and changes in the trophic status were established. Results of this study showed that the fluctuations of the water-level were the leading factor determining the habitats of diatom assemblages in the lake. In the surface sediment samples planktonic species such as Cyclotella spp., Stephanodiscus spp. and Aulacoseira spp. had a depth optimum at 3-4 m and the most abundant periphytic taxa were distributed mostly at depths shallower than 3.5 m. The same regularity was established in sediment cores where a good correlation between planktonic species and lake water depth was found in sediments accumulated at water depths >4 m. Lake Juusa appears to be a proper site for detailed environmental reconstructions over the Holocene, and the results will give us a good opportunity to analyse the history of waterlevel fluctuations in other small Estonian lakes.

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“…dubius preferred deep waters with the highest calculated depth optima (28, 33 and 36 m, respectively). All the planktonic species in this study can be classified as eutrophic taxa (anDerson 1990(anDerson , 1997anDerson et al 1993;Håkansson & regnell 1993;BraDsHaW et al 2005). …”

Section: Species Optima and Tolerancesmentioning

confidence: 99%

Linking spatial distributions of sediment diatom assemblages with hydrological depth profiles in a plateau deep-water lake system of subtropical China.

Wang¹,

Yang²,

Hamilton³

et al. 2012

Fottea

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Abstract:The spatial distributions of approximately 160 diatom taxa from surface sediments of the plateau deep-water Lugu Lake were investigated. The results exhibited a change in the sediment diatom composition with increasing water depth. The main patterns of variation, derived from a principal component analysis (PCA) and detrended correspondence analysis (DCA), showed that diatom community composition was divided into three depth gradients (near-shore zone; mid-depth zone; profundal deep zone). With increasing depth, the pattern of predominantly periphytic taxa in the shallow waters changed to planktonic assemblages dominated by Cyclotella ocellata, Asterionella formosa and Cyclostephanos dubius. Diatom species diversity decreased from the shallow near-shore zone to the deeper open waters. In addition, there was an increase in the ratio of planktonic to periphytic diatoms at depths >30 m. These distinct spatial patterns in diatom distribution are clear markers of current water levels within Lake Lugu and represent a benchmark for evaluating paleolimnological changes in water levels, which can be an indirect proxy of regional climate in this monsoon region of southern Asia.

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Diatom succession related to land use during the last 6000 years: a study of a small eutrophic lake in southern Sweden

Cited by 21 publications

References 16 publications

Problems with the application of diatom‐total phosphorus transfer functions: examples from a shallow English lake

Problems with the application of diatom‐total phosphorus transfer functions: examples from a shallow English lake

Diatom assemblages in sediments of Lake Juusa, Southern Estonia with an assessment of their habitat

Linking spatial distributions of sediment diatom assemblages with hydrological depth profiles in a plateau deep-water lake system of subtropical China.

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