Frustulia krammeri
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Category
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Length Range68-119 µm
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Width Range18-22 µm
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Striae in 10 µm24-26 in the center, 24-25 at the ends
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ContributorPat Kociolek, Carrie Graeff - Jan 2011
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ReviewerMarina Potapova - Jun 2012
Identification
Description
Valves are rhomboid with a very slight constriction near the rounded poles. The striae are parallel at the valve center, wavy near the apices and slightly convergent at the apices. Striae do not circumradiate the apices. The longitudinal striae are parallel at the valve center, but wavy and convergent near the apices. The longitudinal ribs are constricted at the central nodule. The longitudinal ribs fuse with a linear helictoglossa to form a moderate sized porte-crayon. The external proximal raphe ends form small “T” shapes.
These specimens from Goose Lake, Idaho and Island Lake, Washington appear to have more narrowly rounded apices and finer longitudinal ribs than specimens from the type population from Finland (Lange-Bertalot 2001, pl. 128, figs 1-4).
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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BCG
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Waterbody
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Distribution
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Original Description
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AuthorLange-Bert. and Metzeltin 1998
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Length Range96-135 µm
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Width18-24 µm
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Striae in 10µm26-27
Original Images
Original text and images reproduced with permission by ARG Ganter Verlag KG and Koeltz Scientific Books.
Citations & Links
Citations
Links
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Index Nominum Algarum
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GenBank
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North American Diatom Ecological DatabaseNADED ID: 35039
Cite This Page
Kociolek, P., Graeff, C. (2011). Frustulia krammeri. In Diatoms of North America. Retrieved December 21, 2024, from https://diatoms.org/species/45464/frustulia_krammeri
Responses
The 15 response plots show an environmental variable (x axis) against the relative abundance (y axis) of Frustulia krammeri 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.
Frustulia krammeri
- Gap in striae at apices
- Valves strongly rhomboid
- Valve margin slightly constricted at apices
- Longitudinal ribs and raphe curved slightly
- Transapical striae wavy and convergent near apices
Valves are strongly rhomboid, with a slight constriction at the valve apices. The longitudinal ribs and raphe curve slightly in the same direction. Near the apices, the striae become moderately wavy and then convergent at the apices. Striae do not circumradiate the poles.