Diatoms of North AmericaDiatoms of North America

Eunotia rushforthii

Furey, R.L.Lowe and Johansen 2011

Eunotia Rushforthii Guide
  • Category
    Eunotioid
  • Length Range
    14-26 µm
  • Width Range
    2.7-3.6 µm
  • Striae in 10 µm
    19-20

Identification

Eunotia rushforthii LM3 Eunotia rushforthii LM4 Eunotia rushforthii LM6 Eunotia rushforthii LM2 Eunotia rushforthii LM5 Eunotia rushforthii LM1 Eunotia rushforthii LM7
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Description

The ventral margin is only slightly concave to nearly straight. The dorsal margin is convex, with one hardly-visible central swelling. The apices are acutely rounded and very slightly delimited from the rest of the valve. The helictoglossae are not visible in the LM. The raphe curves on to the valve face. The striae are slightly radiate. The areolae are unresolved in the LM.

Autecology

To date E. rushforthii has been found in low densities, epiphytic on bryophytes in first through fifth order streams in the Great Smoky Mountains National Park.

Original Description

Original Description: Valves only slightly concave to nearly straight on ventral margin, convex on dorsal margin, with a hardly-visible central swelling, with apices scarcely delimited from the rest of the valve, 14 – 26 μm long, 2.7 – 3.6 μm wide. Apices acutely rounded. Helictoglossae not visible in the light microscope. Rimoportula at one end of valve. Raphe curved on to the valve face. Striae slightly radiate, 19 – 20 in 10 μm. Puncta unresolved in the light microscope.

  • Author
    Furey, Lowe and Johansen 2011
  • Length Range
    14-26 µm
  • Width
    2.7-3.6 µm
  • Striae in 10µm
    19-20

Original Images

Eunotia rushforthii orig illus
Eunotia Rushforthii Scannedtext

Cite This Page

Furey, P. (2011). Eunotia rushforthii. In Diatoms of North America. Retrieved December 03, 2024, from https://diatoms.org/species/eunotia_rushforthii

Responses

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