Nitzschia amphibia
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Category
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Length Range14-37 µm
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Width Range4.0-4.5 µm
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Striae in 10 µm14-18
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SynonymsHomoeocladia amphibia (Grunow) Kuntze 1898
Bacillaria amphibia (Grunow) Elmore in Barbour 1895
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ContributorPat Kociolek - Mar 2011
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ReviewerRex Lowe - Nov 2011
Identification
Description
Valves are linear to lanceolate. The valves taper to bluntly rounded apices. Fibulae are distinct and number 7-9 in 10 µm. The central nodule is evident. Striae are characteristically prominent and distinctly punctate, but not necessarily regularly spaced.
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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BCG
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Waterbody
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Distribution
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Original Description
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AuthorGrunow 1862
Original Images
Citations & Links
Links
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Index Nominum Algarum
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GenBank
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North American Diatom Ecological DatabaseNADED ID: 48004
Cite This Page
Kociolek, P. (2011). Nitzschia amphibia. In Diatoms of North America. Retrieved December 16, 2024, from https://diatoms.org/species/46231/nitzschia_amphibia
Responses
The 15 response plots show an environmental variable (x axis) against the relative abundance (y axis) of Nitzschia amphibia 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.
Nitzschia amphibia
- Valves are linear to lanceolate
- Striae distinctly punctate
- Central nodule present
Valves taper to bluntly rounded apices. Fibulae are distinct, 7-9 in 10 µm. The central nodule, evident as a wider space between two central fibulae, is present. Striae are characteristically prominent and distinctly punctate, and may be irregularly spaced.