Odmiany polimorficzne węglanu wapnia na powierzchni plech Ulva (Chlorophyta) notowanych w wodach słodkich
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Date
2014
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Abstract
Process of calcification, which is the formation
of calcite — a pure calcium carbonate mineral, commonly
takes place among both marine and freshwater
algae. The available literature referring to inland
waters provides a lot of information about calcareous
macroalgae, mainly on extensively encrusted
species of Chara, called stoneworts. In addition to
this group, where CaCO3 may provide 60% of dry
weight, also freshwater green alga Ulva is prone
to CaCO3 precipitation (up to 50% of dry weight).Freshwater Ulva exhibit an extracellular calcification
mode and the deposits form bands on the surface
of a thallus. Owing to a large number of calcite
crystals the surface is quite coarse. Microscopic observations
demonstrated differences in the size and
shape of crystals and divided them into two morphology
types of CaCO3 microcrystals: calcite rhombohedrons
and aragonite needles. The percentage of
CaCO3 in the thalli was about 50% of dry weight.
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Keywords
Ulva, węglan wapnia, kryształy, kalcyt, aragonit, Enteromorpha, freshwater Ulva, freshwater Enteromorpha, plecha
Citation
Kosmos 63(1),2014, pp. 117-124.