Credit: USGS.
USGS station 0242354750 - Cahaba Valley Creek near Pelham, Al., where C. variostriata can be found.
Cavinula variostriata
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Category
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Length Range16-35 µm
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Width Range7-8 µm
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Striae in 10 µm24-28
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ContributorMeredith Tyree Polaskey, Hayden Ripple - Feb 2018
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ReviewerSarah Spaulding - Jul 2018
Identification
Description
Valves are linear-elliptic with rounded apices. The axial area is narrow and linear. The central area is broad and transversely elliptic to somewhat rectangular. Striae are radiate throughout, more strongly so near the central area. Striae are variable in length near the central area. Distal raphe ends are straight and undeflected.
Autecology
Cavinula variostriata has been reported from sites across the United States, from Alabama in the south to Alaska in the north. While it is widely distributed, it is considered to be rare in occurrence because it is typically low in aboundance.
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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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Occurrence
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Waterbody
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Distribution
- Learn more about this
Credit: USGS Biodata.
C. variostriata distribution from USGS Biodata.
Original Description
N. variostriata nov. spec. - (Fig. 12). - Lang elliptisch mit breit gerundeten Enden, enger Axial- und weiter, runder Zentral-Area. Streifen strahlend und schwach gebogen, die mittleren abwechselnd länger und kürzer, auch etwas kräftiger als die anern, ungefähr 30 in 10µ. Länge 38µ, Breite 10µ. - Fundort: Christteich am Stellberg (Söhre). - Diese im Christteich nur wenigen Exemplaren gefundene Art traf ich häufig in einem Material an, das aus einem Moosrasen einer quelligen Stelle an einer Bergheide bei Vockerode (Spangenberg) sammte, der mir von Herrn Veterinärrat Dr. GRIMME-Cassel in dankenswerter Weise zur Verfügung gestellt war.
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BasionymNavicula variostriata
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AuthorKrasske 1923
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Length Range38 µm
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Width10 µm
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Striae in 10µm30
Original Images
Citations & Links
Citations
Links
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Index Nominum Algarum
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North American Diatom Ecological DatabaseNADED ID: 50314
Cite This Page
Polaskey, M., Ripple, H. (2018). Cavinula variostriata. In Diatoms of North America. Retrieved December 26, 2024, from https://diatoms.org/species/84085/cavinula_variostriata
Responses
The 15 response plots show an environmental variable (x axis) against the relative abundance (y axis) of Cavinula variostriata 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.
Cavinula variostriata
- Valves linear-elliptic
- Central area elliptic to rectangular
- Striae radiate
Valves are linear-elliptic with rounded apices. The central area is elliptic to rectangular. Striae are curved and radiate throughout. Striae vary in length around the central area.