Geissleria kriegeri
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Category
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Length Range11-23 µm
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Width Range5.0-7.5 µm
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Striae in 10 µm16-23
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ContributorMarina Potapova - Dec 2010
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ReviewerSam Rushforth - Aug 2013
Identification
Description
Valves are elliptical-lanceolate with subrostrate ends, 5.0-7.5 µm wide and 11-23 µm long. The raphe is straight and filiform. The axial area is narrow and linear. The central area is small, without isolated areolae. Striae are uniseriate, radiate, and number 16-23 in 10 µm. Areolae are apically elongated and number approximately 65-70 in 10 µm. Subpolar areolae, or annulae, are larger than areolae on other parts of the valve. The annulae form three-four rows at each pole. Note that North American specimens have slightly more drawn-out valve apices than European specimens. This morphological difference may indicate that North American “G. kriegeri” is another species.
Autecology
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Size Range, µm3
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Motility
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Attachment
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Habitat
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Colony
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Waterbody
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Distribution
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Original Description
Schalen elliptisch bis lanzettlich-elliptisch mit breit gerundeten Enden. 14—19 μ lang, 6—7 μ breit. Area sehr eng, in der Mitte kaum erweitert. Streifen wenig radial, etwa 16 in 10 μ, nach den Enden enger.
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BasionymNavicula kriegeri
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AuthorKrasske 1943
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Length Range14-19 µm
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Width6-7 µm
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Striae in 10µm16
Original Images
Citations & Links
Citations
Links
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Index Nominum Algarum
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North American Diatom Ecological DatabaseNADED ID: 210007
Cite This Page
Potapova, M. (2010). Geissleria kriegeri. In Diatoms of North America. Retrieved December 26, 2024, from https://diatoms.org/species/45199/geissleria_kriegeri
Responses
The 15 response plots show an environmental variable (x axis) against the relative abundance (y axis) of Geissleria kriegeri from all the stream reaches where it was present. Note that the relative abundance scale is the same on each plot. Explanation of each environmental variable and units are as follows:
ELEVATION = stream reach elevation (meters)
STRAHLER = distribution plot of the Strahler Stream Order
SLOPE = stream reach gradient (degrees)
W1_HALL = an index that is a measure of streamside (riparian) human activity that ranges from 0 - 10, with a value of 0 indicating of minimal disturbance to a value of 10 indicating severe disturbance.
PHSTVL = pH measured in a sealed syringe sample (pH units)
log_COND = log concentration of specific conductivity (µS/cm)
log_PTL = log concentration of total phosphorus (µg/L)
log_NO3 = log concentration of nitrate (µeq/L)
log_DOC = log concentration of dissolved organic carbon (mg/L)
log_SIO2 = log concentration of silicon (mg/L)
log_NA = log concentration of sodium (µeq/L)
log_HCO3 = log concentration of the bicarbonate ion (µeq/L)
EMBED = percent of the stream substrate that is embedded by sand and fine sediment
log_TURBIDITY = log of turbidity, a measure of cloudiness of water, in nephelometric turbidity units (NTU).
DISTOT = an index of total human disturbance in the watershed that ranges from 1 - 100, with a value of 0 indicating of minimal disturbance to a value of 100 indicating severe disturbance.
Geissleria kriegeri
- Valves elliptical-lanceolate with subrostrate apices
- Central area small
- Areolae in central area absent
- Annulae in three or four rows at poles
Valves are elliptical-lanceolate with subrostrate ends, 5.0-7.5 µm wide and 11-23 µm long. The central area is small, without isolated areolae. Striae are uniseriate, radiate, and number 16-23 in 10 µm. The annulae form three-four rows at each pole.