Diatoms of North AmericaDiatoms of North America

Pinnularia brauniana

(Grunow) Studnicka 1888

Pinnularia Brauniana2 Guide
  • Category
    Symmetric Biraphid
  • Length Range
    35.7-74.4 µm
  • Width Range
    7.1-10.4 µm
  • Striae in 10 µm
    9-12
  • Synonyms
    Pinnularia braunii Cleve

Identification

Pinnularia brauniana LM2 Pinnularia brauniana LM3 Pinnularia brauniana LM1 Pinnularia brauniana LM6 Pinnularia brauniana LM5 Pinnularia brauniana LM4
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Pinnularia brauniana SEM4 Pinnularia brauniana SEM2

Description

Valves are rhombic-lanceolate with convex sides and subcapitate to capitate ends. The axial area is broad and lanceolate with ghost striae sometimes visible. The central area is a wide fascia. The raphe is straight and lateral, with expanded proximal ends deflected in the same direction and distal ends forming ?-shaped hooks. The striae are slightly curved throughout, transitioning from radiate at center valve to divergent at the apices.

Autecology

Pinnularia brauniana is widespread throughout North America and Europe. This species prefers slightly acidic ponds that are oligotrophic to dystrophic (Lange-Bertalot et al. 2017, Siver et al. 2005).

Original Description

  • Basionym
    Navicula brauniana
  • Author
    Grunow 1876

Original Images

Pinnularia Brauniana Orig Illus

Cite This Page

Polaskey, M. (2018). Pinnularia brauniana. In Diatoms of North America. Retrieved April 26, 2024, from https://diatoms.org/species/pinnularia-brauniana

Responses

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