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A-F. Calcification in B. ganeshii. (A) Light-microscopy view of an encrusted filament segment; the scale bar represents 30 µm.(B) SEM view of nucleation of spherical particles of amorphous calcium carbonate (arrow); the scale bar represents 1 µm. (C) SEM views of without encrustation (left side) and a cluster of calcite triangles on a heavily encrusted filament (right side). The rectangular area is enlarged in (D). The scale bar represents 20 µm. (D) SEM view of lamellar triangular plan view of calcite crystals; the scale bar represents 10 µm. (E) SEM view of cross-section of a heavily encrusted filament with calcite crystals; the scale bar represents 20 µm. (F) SEM view of broken encrustation showing the trichome in the interior; the scale bar represents 50 µm.

A-F. Calcification in B. ganeshii. (A) Light-microscopy view of an encrusted filament segment; the scale bar represents 30 µm.(B) SEM view of nucleation of spherical particles of amorphous calcium carbonate (arrow); the scale bar represents 1 µm. (C) SEM views of without encrustation (left side) and a cluster of calcite triangles on a heavily encrusted filament (right side). The rectangular area is enlarged in (D). The scale bar represents 20 µm. (D) SEM view of lamellar triangular plan view of calcite crystals; the scale bar represents 10 µm. (E) SEM view of cross-section of a heavily encrusted filament with calcite crystals; the scale bar represents 20 µm. (F) SEM view of broken encrustation showing the trichome in the interior; the scale bar represents 50 µm.

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Figure 1. Sampling sites of B. ganeshii populations in central Mexico....
Figure 2A-E. Seasonal changes in temperature (A), pH (B), total...
Figure 3. Redundancy analysis (RDA) biplot of the carbonate...
Figure 4A-F. Calcification in B. ganeshii. (A) Light-microscopy view of...
Figure 5A-B. Electron dispersive X-ray spectroscopy of B. ganeshii...
Calcification of the filamentous cyanobacterium Blennothrix ganeshii in calcareous tropical streams of central Mexico region Calcificación de la cianobacteria Blennothrix ganeshii en ríos calcáreos tropicales de la región central de México
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  • Jan 2013
Beltrán-Magos, Y, J. Carmona, G. Vilaclara and M. Bojorge-García. 2013. Calcification of the filamentous cyanobacterium Blennothrix ganeshii in calcareous tropical streams of central Mexico region. Hidrobiológica 23 (1): XXX-XXX. ABSTRACT Geochemical, mineralogical and microbiological data from four freshwater streams in central region of Mexico in...
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Context 1
... occurred as dense, thick encrustation around the sheaths, creating micritic (metabolically induced, but environmentally dependent) tubes typically 10-25 µm thick enclosing B. ganeshii filaments (Figs. 4A, C). The calcareous tubes around the filaments were separate from each other. Distal ends of the filaments remained uncalcified, and allowing trichomes to be visible (Fig. 4E). Calcite crystals displayed a rhombohedral form with triangular surfaces and irregular disposition (Figs. 4C-D), forming the "gothic arch crystals" described by ...