Diatoms of North AmericaDiatoms of North America

Eunotia boomsma

Furey, Lowe and Johansen 2011

Eunotia Boomsma Guide 1
  • Category
    Eunotioid
  • Length Range
    27-45 µm
  • Width Range
    5.8-6.9 µm
  • Striae in 10 µm
    12-13 in the center valve

Identification

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

Ventral margin is straight to weakly concave and the dorsal margin is convex and broadly biundulate. Apices are broadly rounded and set off by a change in the slope of the dorsal margin. Helictoglossae are visible in the LM. Raphe with distal ends curved onto the valve surface. Striae are slightly radiate, sometimes with abbreviated striae on the dorsal margin.

Autecology

To date Eunotia boomsma has been found in low numbers, epiphytic on bryophytes, in streams and wet walls in the Great Smoky Mountains National Park.

Gsm 7 26 05 6 F 0163 Algal Twig
Credit: Paula C. Furey
Type locality:Upper Beard Cane Creek in the Hesse Creek watershed in the Great Smoky Mountains National Park, Blount County, Tennessee.

Original Description

Valves straight to weakly concave on the ventral margin, convex and broadly biundulate on the dorsal margin, 27 – 45 μm long, 5.8 – 6.9 wide. Apices broadly rounded, set off by a change in the slope of the dorsal margin. Helictoglossae visible in the light microscope. Raphe with distal ends curved onto the valve surface. Striae slightly radiate, 12 – 13 in 10 μm, sometimes with abbreviated striae on the dorsal margin. Areolae 36-38 in 10 μm.

  • Author
    Furey, Lowe and Johansen 2011
  • Length Range
    27-45 µm
  • Width
    5.8-6.9 µm
  • Striae in 10µm
    12-13 in the center valve

Original Images

Eunotia boomsma orig illus
Eunotia Boomsma Textscan

Cite This Page

Furey, P. (2011). Eunotia boomsma. In Diatoms of North America. Retrieved April 19, 2024, from https://diatoms.org/species/eunotia_boomsma

Responses

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