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The database is hosted by Kiel University
and is established by Magda Wieckowska-
Lüth, Wiebke Kirleis and Kay Schmütz,
Institute for Prehistoric and Protohistoric Archaeology.

© Wieckowska-Lüth/Kirleis/Schmütz 2020

HdV-146Type: HdV-146

Category: Cyanobacteria

Taxonomical identification: Gloeotrichia-type

First publication: van der Wiel, A.M. (1982) A palaecological study of a section from the foot of the Hazendonk (Zuid-Holland), based on the analysis of pollen, spores and macroscopic remains. Review of Palaeobotany and Palynology 38, 35–90

Other publication/s:
van Geel, B., Hallewas, D.P. and Pals, J.P. (1983) A Late Holocene deposit under the Westfriese Zeedijknear Enkhuizen (Prov of Noord-Holland, The Netherlands): palaeoecological and archaeological aspects. Review of Palaeobotany and Palynolynology 38, 269–335
van Geel, B., Coope, G.R. and van der Hammen, T. (1989) Palaeoecology and stratigraphy of the Late-glacial type section at Usselo (The Netherlands). Review of Palaeobotany and Palynology 60, 25–129
van Geel, B., Odgaard, B.V. and Ralska-Jasiewiczowa, M. (1996) Cyanobacteria as indicators of phosphate-eutrophication of lakes and pools in the past. Pact 50, 399–415
Kuhry, P. (1997) The palaeoecology ot a treed bog in western boreal Canada: a study based on microfossils, macrofossils and physico-chemical properties. Review of Palaeobotany and Palynology 96, 183–224

Description: Tube-shaped hyaline sheaths of of cyanobacteria, straight or slightly curved, 60.0–167.5 x 15.5–32.5 µm or 19–380 x 11–30 µm; Sheaths measure up to 250 µm in length, with a diameter of 7–20 µm; Walls 1.5–32.5 µm thick; The relatively thick ones showing a lamellate structure; Proximal end of the sheaths rounded with a depression with a ca. 3 µm wide pore, originally forming the connection with the globose heterocyst; The distal end always open, originally surrounding the basal cells of a series of living algal cells (trichome). Some specimens show one or more constrictions of the sheath. Sheaths emptied or still filled with an akinete in the proximal part. Sometimes colonies of sheaths were observed.

(Sub-) Fossil occurence: The Gloeotrichia-type was among the first colonizer of the pool. During the earliest phase ofthe Late Glacial the soils, pools and lakes in N.W. Europe must have been very poor in nitrogen-components and in humus. In this situation cyanobacteria apparently could play a pioneer role thanks to their nitrogen-fixing ability. They gradually opened local conditions for other aquatic plants.

Co-occurence: No information

Modern occurence: In oxidizable organic compounds. Optimal conditions in an alkaline environment (pH 7–8.5), eutrophic to mesotrophic open ponds and ephemeral pools. Abundant occurrence of certain cyanobacteria in lake deposits can be interpretated as an indicator of relatively warm climatic phases.

Palaeoenvironmental indication: Alkaline conditions (pH 7–8.5) / Eutrophic to mesotrophic conditions / Open ponds and ephemeral pools / Relatively warm conditions