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

Punning, J-M; Puusepp, Liisa

doi:10.1007/s10750-006-0474-8

Cited by 25 publications

(13 citation statements)

References 47 publications

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“…In addition, the appearance of Cyclotella ocellata in the fossil record of lakes has commonly been interpreted as indicating higher lake water levels (e.g. Punning and Puusepp 2007 (Conedera et al 2004). In addition, the development of the effect of climate cannot be ruled out, the evidence points to major human impact that changed the forest structure after 4650 cal.…”

Section: Climatic Versus Anthropogenic Forcing In the Picos De Europamentioning

confidence: 99%

Revealing the last 13,500 years of environmental history from the multiproxy record of a mountain lake (Lago Enol, northern Iberian Peninsula)

et al. 2009

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We present the Holocene sequence from Lago Enol (43°16′ N, 4°59′ W, 1070 m a.s.l.), Cantabrian Mountains, northern Spain. A multiproxy analysis provided comprehensive information about regional humidity and temperature changes. The analysis included sedimentological descriptions, physical properties, carbon and carbonate content, mineralogy and geochemical composition together with biological proxies including diatom and ostracod assemblages. A detailed pollen study enabled reconstruction of variations in vegetation cover, which were interpreted in the context of climate changes and human impact. Four distinct stages were recognized for the last 13,500 years: (i) a cold and dry episode that includes the Younger Dryas event (13,500−11,600 cal. yr BP);(ii) a humid and warmer period characterizing the onset of the Holocene (11,600−8700 1 cal. yr BP); (iii) a tendency toward a drier climate during the Middle Holocene (8700−4650 cal. yr BP); and (iv) a return to humid conditions following landscape modification by human activity (pastoral activities, deforestation) in the Late Holocene (4650−2200 cal. yr BP). Superimposed on relatively stable landscape conditions (e.g. maintenance of well established forests), the typical environmental variability of the southern European region is observed at this site.

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Section: Climatic Versus Anthropogenic Forcing In the Picos De Europamentioning

confidence: 99%

Revealing the last 13,500 years of environmental history from the multiproxy record of a mountain lake (Lago Enol, northern Iberian Peninsula)

et al. 2009

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“…Lake-level fluctuations have been reconstructed successfully using changes in diatom assemblages in other regions (Punning and Puusepp 2007;Laird and Cumming 2008). Diatom-inferred changes in depth have been employed most successfully in lakes where the ratio of planktonic to benthic species was the dominant change during a deepening or shallowing of the lake (Brugam et al 1998;Laird and Cumming 2008).…”

Section: Lake-level Reconstructionsmentioning

confidence: 99%

“…Laird and Cumming (2008), for example, compared diatom-inferred depths with instrumental records from an Ontario lake; they found that lake level decreases of 0.2-0.3 m during the drought of the 1980s were not reflected by the diatom-based record of depth, but larger changes of several meters to tens of meters over the Holocene matched well with changes in depth inferred from other proxies. Some studies have shown that more robust models for diatom variability with depth can be developed by using a calibration set based on shallow-to-deep water transects within an individual lake rather than by using a suite of lakes with a range of maximum depths as has been done here (Punning and Puusepp 2007;Laird and Cumming 2008).…”

Section: Resolution and Datingmentioning

confidence: 99%

Inferring lake depth using diatom assemblages in the shallow, seasonally variable lakes of the Nebraska Sand Hills (USA): calibration, validation, and application of a 69-lake training set

et al. 2010

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Part of the Earth Sciences CommonsThis Article is brought to you for free and open access by the Earth and Atmospheric Sciences, Department of at DigitalCommons@University of Nebraska -Lincoln. It has been accepted for inclusion in Papers in the Earth and Atmospheric Sciences by an authorized administrator of DigitalCommons@University of Nebraska -Lincoln.Shinneman, Avery L. C.; Bennett, Danuta M.; Fritz, Sherilyn C.; Schmieder, Jens; Engstrom, Daniel R.; Efting, Aris; and Holz, John, "Inferring lake depth using diatom assemblages in the shallow, seasonally variable lakes of the Nebraska Sand Hills (USA): Calibration, validation, and application of a 69-lake training set" (2010 Ogallala aquifer, an important water resource for the central Great Plains. Lake levels are affected directly by fluctuations in the water table, which is recharged primarily by local precipitation and responds quickly to climatically induced changes in regional water balance. Instrumental records are available for only 50-100 years, and paleolimnological data provide important insights into the extremes and variability in moisture balance over longer time scales. A set of 69 lakes from across Nebraska was used to establish a statistical relationship between diatom community composition and water depth. This relationship was then used to develop a diatombased inference model for water depth using weighted averaging regression and calibration techniques. Development of the inference model was complicated by strong intra-seasonal variability in water depth and the linkages between depth and other limnologic characteristics, including alkalinity, water clarity and nutrient concentrations. Analysis of historical diatom communities from eight lakes allowed for the reconstruction of lake-level fluctuations over the past several thousand years. Comparisons of the more recent portion of these reconstructions with the instrumental Palmer Drought Severity Index (PDSI) showed that sediment records may not faithfully reflect short-term fluctuations in water level, except where sedimentation rates are very high. However, large and persistent changes in moisture availability were discernible even in longer, low-resolution records. Thus, diatoms are a useful addition to the tools available for understanding past drought in the central Great Plains, especially when trajectories of change are constrained by data from multiple sites or other proxies.

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“…Among the periphyton community the most likely assemblage to be affected by low lake levels are the epiphytic forms attached to plants. In addition, in freshwater lakes, fluctuations of the water level could be a steering factor determining the habitats of diatom assemblages in the lake (Punning & Puusepp, 2007). WLF also affect phytoplankton development (abundance, biomass, size structure, taxonomic composition, species diversity and rate of community compositional change) (de Emiliani, 1997;Noges & Laugaste, 1998;Coops & Hosper, 2002;de Domitrovic, 2003;Kangur et al, 2003;Stockner et al, 2005).…”

Section: Effects On Biotamentioning

confidence: 99%

Effects of water-level fluctuations on lakes: an annotated bibliography

2008

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Water-level fluctuations (WLF) in lakes and rivers, especially their extent, frequency and duration, are dominant forces controlling the functioning of these ecosystems. In particular, WLF play an important role in the lake's littoral and aquatic-terrestrial interface processes. WLF may take place on different spatial and temporal scales under natural conditions but water levels have been artificially modified in regulated lakes, and their impacts are expected to be enhanced within the actual global change scenarios with forthcoming management problems. This article presents an overview on the literature published on this important topic since 1991 by using journals indexed in the ISI Web of Knowledge. The overall objective was to examine temporal and spatial trends in publications on WLF, the specific aspect of WLF concerned and their main effects. Throughout the article we have used case studies to illustrate different effects of WLF on the variety of lake habitats and indicators that have been studied. Overall, the number of papers published on the subject since the 1990s has risen steadily, when less than ten papers were published each year; until 2006 and peaking in 2005. The greatest number of papers on WLF has been carried out in Europe and North America (c. 73%). These data also showed that the effects of WLF have not been studied equally for different groups of organisms. There is a greater interest on macrophytes, which are the most studied group of organisms (18.4% of the papers). Nearly 7% of the papers deal with algae, and zooplankton and invertebrates account for a 7% followed by fish. WLF effects on ecosystems are very complex, and the biological effects in lakes are greatest in shallow water and littoral areas, where even small changes in water levels can result in the conversion of large areas of a standing-water environment in air exposed habitats. Finally, these data might serve to highlight knowledge gaps still existing on this topic and, in particular, some of the approaches that can potentially contribute to solve several of these lacunae are explored.

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

Cited by 25 publications

References 47 publications

Revealing the last 13,500 years of environmental history from the multiproxy record of a mountain lake (Lago Enol, northern Iberian Peninsula)

Revealing the last 13,500 years of environmental history from the multiproxy record of a mountain lake (Lago Enol, northern Iberian Peninsula)

Inferring lake depth using diatom assemblages in the shallow, seasonally variable lakes of the Nebraska Sand Hills (USA): calibration, validation, and application of a 69-lake training set

Effects of water-level fluctuations on lakes: an annotated bibliography

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