Diatoms of North AmericaDiatoms of North America

Navicula tripunctata

(O.F.Müll.) Bory 1822

N Tripunctata Guide
  • Category
    Symmetric Biraphid
  • Length Range
    32-60 µm
  • Width Range
    6–10 µm
  • Striae in 10 µm
    9–12

Identification

Navicula tripunctata LM6 Navicula tripunctata LM4 Navicula tripunctata LM8 Navicula tripunctata LM10 Navicula tripunctata LM2 Navicula tripunctata LM12 Navicula tripunctata LM14
View image metadata
46104 Sem2 1 46104 Sem1 1

Description

Valves are linear-lanceolate with wedge-shaped ends, 6-10 µm wide, 32-60 µm long. The raphe is straight. The axial area is narrow, linear, with the central area transversely rectangular or elliptical. The striae are almost parallel throughout the valve, weakly radiate in the middle and slightly convergent at the apices, 9-12 in 10 µm. Areolae 30-33 in 10 µm.

Autecology

Although this taxon does not typically reach high abundance within a sample, it is widespread in geographic distribution and tolerant of human impact.

Original Description

Vibrio linearis, utrique attenuatus, globulis tribus, extremis minoribus.

  • Basionym
    Vibrio tripunctatus
  • Author
    O.F.Müll. 1786

Original Images

Nav Trip Orig Illustr
Nav Trip Orig Descr

Cite This Page

Potapova, M. (2009). Navicula tripunctata. In Diatoms of North America. Retrieved December 26, 2024, from https://diatoms.org/species/44521/navicula_tripunctata

Responses

The 15 response plots show an environmental variable (x axis) against the relative abundance (y axis) of Navicula tripunctata 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.

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