Navicula veneta
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Category
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Length Range17-26 µm
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Width Range4.4-5.3 µm
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Striae in 10 µm14-15 in the center valve
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SynonymsNavicula cryptocephala var. veneta (Kütz.) Rabenh.
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ContributorMarina Potapova - Mar 2011
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ReviewerSam Rushforth - Oct 2011
Identification
Description
Valves are lanceolate to linear-lanceolate with moderately protracted apices. The axial area is narrow and straight. The central area is transversely rectangular or ellipticl. The raphe is straight, with drop-like external proximal ends. Striae are slightly radiate around the center, becoming convergent at the apices. The areolae are sometimes visible under LM, approximately 35 in 10 μm.
Autecology
This taxon is found in low gradient rivers and is tolerant of high pH, conductance, nitrogen and phosphorus concentrations, and alkalinity. It is able to live in rivers with high sediment loads, turbidity and measures of high human disturbance. Indeed, it is considered a pollution-tolerant species.
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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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BCG
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Waterbody
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Distribution
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Original Description
N. minutula, lanceolata, latiuscula, laevissima, apicibus productis obtusiusculus. Long. 1/115’’’.
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AuthorKütz. 1844
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Length Range19.6 µm
Original Images
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: 46504
Cite This Page
Potapova, M. (2011). Navicula veneta. In Diatoms of North America. Retrieved December 21, 2024, from https://diatoms.org/species/45817/navicula_veneta
Responses
The 15 response plots show an environmental variable (x axis) against the relative abundance (y axis) of Navicula veneta 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.
Navicula veneta
- Valves lanceolate to linear-lanceolate, with moderately protracted apices
- Central area transversely rectangular or elliptic
- External proximal raphe ends drop-like
Valves are lanceolate to linear-lanceolate with moderately protracted apices. The central area is transversely rectangular or elliptic. The raphe is straight, with drop-like external proximal ends. The striae are slightly radiate around the center, becoming convergent at the apices. The areolae are sometimes visible under LM,...