A LIGHT AND ELECTRON MICROSCOPE STUDY OF PREVIOUSLY DESCRIBED AND NEW<i>STEPHANODISCUS</i>SPECIES (BACILLARIOPHYCEAE) FROM CENTRAL AND NORTHERN CANADIAN LAKES, WITH ECOLOGICAL NOTES ON THE SPECIES

Håkansson, Håkan; Kling, Hedy

doi:10.1080/0269249x.1989.9705076

Cited by 44 publications

(15 citation statements)

References 13 publications

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“…in Sacrower See. Similar observations have been made by Håkansson & Kling (1989) and Hickel & Håkansson (1993), who report Stephanodiscus spp. mainly blooming in winter and spring due to lake-water mixing, high nutrient concentrations, and increasing insolation. )…”

Section: Diatom Assemblagessupporting

confidence: 71%

Seasonal and interannual dynamics of diatom assemblages in Sacrower See (NE Germany): a sediment trap study

et al. 2008

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Diatom assemblages from sediment trap samples collected during ten intervals between October 2003 and October 2005 in Sacrower See (NE Germany) were related to limnological and meteorological data. Sacrower See is a dimictic, 38 m deep, hypertrophic lowland lake (29.5 m a.s.l.). We identified distinct seasonal and interannual changes of diatom assemblages for the studied period. Diatoms showed a typical seasonal succession for temperate, dimictic, and eutrophic lakes.Stephanodiscus parvus, S. hantzschii, S. neoastraea, and S. alpinus had high accumulation rates during winter and spring, whereas species of the genera Stephanodiscus, Fragilaria, and Nitzschia were the predominant diatoms during summer and autumn.In a Canonical Correspondence Analysis, precipitation, air and water temperatures, epilimnetic calcium, pH, and total phosphorus concentrations together explained 70% of the variance of the diatom data. Interannual variability in the diatom assemblages during the two sampled years mainly seems to reflect changes in the total phosphorus concentration and temperature and secondarily the onset of the growing season and of stratification.

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Section: Diatom Assemblagessupporting

confidence: 71%

Seasonal and interannual dynamics of diatom assemblages in Sacrower See (NE Germany): a sediment trap study

et al. 2008

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“…The Beaver Lake core is the only site to contain 20th century sediments, and zone B-9, representing the last 70 years, is charac terized by the dominance of the planktic diatom S. niagarae (Figure 4), which is common in eutrophic lakes in the northern USA and Canada (Brugam, 1983;Håkansson and Kling, 1989;Theriot,1987;Theriot and Stoermer, 1981), and likely reflects anthropogenic-induced eutrophication of the lake. The expansion of Salsola (Russian thistle), an introduced weed, in pollen zone B-9 (Figure 6) indicates European settlement and disturbance (Jacobson and Engstrom, 1989).…”

Section: Late Holocene (~4000-0 Cal Yr Bp)mentioning

confidence: 99%

Holocene variability in hydrology, vegetation, fire, and eolian activity in the Nebraska Sand Hills, USA

et al. 2012

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This study combined multiple aquatic and terrestrial proxies, including diatoms, pollen, grain size, and bulk-sediment chemistry to reconstruct the history of three lake sites located in the central Sand Hills of Nebraska, USA. Long-term changes in effective moisture are evident at all sites, with significant changes occurring at ~6000, ~4000, and ~ 2000 cal. yr BP. Both aquatic and terrestrial indicators suggest that effective moisture was low between 10,000 and ~6000 cal. yr BP, and that this time interval was the driest period of the Holocene. The dominance of benthic and tychoplanktic diatom taxa indicates relatively shallow lake-level, high sand influx indicates moderately high eolian activity, and the pollen assemblage suggests xeric grasslands with abundant mud flats. About 6000 cal. yr BP, all three sites experienced an increase in effective moisture. Lake-level rise is indicated by increases in planktic and tychoplanktic diatoms relative to benthic taxa, while greater abundance of grass pollen and charcoal, and decreased eolian flux indicate stabilized dunes with dense vegetation sufficient to fuel local fires. A significant hydrologic shift recorded at all sites occurred at ~4000 cal. yr BP. This event was characterized by substantial lake-level rise, yet decreased grass cover and fire frequency, and increased eolian activity. Water-table rise may have been caused by a combination of factors including: (1) formation of dune-dams that blocked old drainage channels, (2) reduced grass cover and hence reduced evapotranspiration, and (3) changes in the frequency and duration of drought. The most likely cause(s) of the differential response of the terrestrial and aquatic systems at this time is not clear, none-the-less the late Holocene was not nearly as dry as the interval prior to 6000 cal. yr BP. The last ~2000 yr were characterized by several short-term fluctuations in lake level, including an interval of drought between 950 and 750 cal. yr BP, coincident with increased eolian activity during the latter part of the Medieval Climatic Anomaly.

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“…A rise in A. ambigua and S. niagarae, planktic taxa with moderate depth optima, and a concomitant decrease in tychoplankton, suggest rising lake-levels between 3800 and 3500 cal a BP (zones W-2 & E-2). S. niagarae is a common planktonic species in eutrophic lakes in the northern United States and Canada (Theriot and Stoermer, 1981;Theriot, 1987;Håkansson and Kling, 1989), including in eutrophic prairie lakes in Minnesota (Brugam and Speziale, 1983).…”

Section: Twin Lakesmentioning

confidence: 99%

A regional-scale climate reconstruction of the last 4000 years from lakes in the Nebraska Sand Hills, USA

Schmieder

Fritz

Swinehart

et al. 2011

Quaternary Science Reviews

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A LIGHT AND ELECTRON MICROSCOPE STUDY OF PREVIOUSLY DESCRIBED AND NEWSTEPHANODISCUSSPECIES (BACILLARIOPHYCEAE) FROM CENTRAL AND NORTHERN CANADIAN LAKES, WITH ECOLOGICAL NOTES ON THE SPECIES

Cited by 44 publications

References 13 publications

Seasonal and interannual dynamics of diatom assemblages in Sacrower See (NE Germany): a sediment trap study

Seasonal and interannual dynamics of diatom assemblages in Sacrower See (NE Germany): a sediment trap study

Holocene variability in hydrology, vegetation, fire, and eolian activity in the Nebraska Sand Hills, USA

A regional-scale climate reconstruction of the last 4000 years from lakes in the Nebraska Sand Hills, USA

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