Pinnularia marchica
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Category
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Length Range11-20 µm
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Width Range4-5 µm
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Striae in 10 µm10-13
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Reported AsPinnularia microstauron (Krammer and Lange-Bertalot 1986)
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ContributorMarina Potapova - Jan 2012
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ReviewerSam Rushforth - Jan 2014
Identification
Description
Valves are linear to elliptic-lanceolate, with rostrate apices (in most, but not all, specimens). The axial area is lanceolate, widening into a large central area that reaches the valve margins. The raphe is straight, with proximal ends bent slightly to one side. Striae are radiate near the valve center and slightly convergent near the apices.
Original Description
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AuthorSchönfelder ex Krammer 2000
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Length Range22-37 µm
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Width4.7-6.3 µm
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Striae in 10µm11-14
Original Images
Citations & Links
Links
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Index Nominum Algarum
Cite This Page
Potapova, M. (2012). Pinnularia marchica. In Diatoms of North America. Retrieved December 26, 2024, from https://diatoms.org/species/48191/pinnularia_marchica
Responses
The 15 response plots show an environmental variable (x axis) against the relative abundance (y axis) of Pinnularia marchica 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.
Pinnularia marchica
- Valves linear to elliptic-lanceolate
- Apices rostrate to slightly capitate
- Central area large, reaching valve margin
- Striae radiate near valve center
Valves are linear to elliptic-lanceolate. The apices are rostrate to slightly subcapitate. Valves are 4-5 µm in width. The axial area is lanceolate, widening into a large central area that extends to the valve margin. Striae are radiate near the valve center and slightly convergent near the apices.