Identification

Description

Valves linear-clavate. Margins convex but not tumid at the center (except for initial valves). Headpole broadly rounded; footpole narrowly rounded. Initial valves are 108-128 µm long, 21-26 µm wide. Axial area is narrow, straight and expanded only at the center to form a linear-elliptical central area bearing one stigma. The raphe is lateral and undulate. Striae are radiate, more strongly so towards the footpole. The biseriate nature of the striae is evident. The longitudinal lines are located about half-way between the axial area and margin. Apical pore fields are bi-lobed.

Distribution: Gomphoneis minuta has been confirmed from a number of sites across the U.S., from Washington to Arizona and east to Virginia and North Carolina.

Autecology

Original Description

  • Basionym
    Gomphoneis herculeana var. minuta
  • Author
    J.L.Stone in McLaughlin and J.L.Stone 1986

EMAP Assessment

EMAP Distribution

Gomphoneis Minuta 40 Copy
Map 40

Response Plots

Gomphoneis Minuta Copy

Cite This Page

Kociolek, P. (2011). Gomphoneis minuta. In Diatoms of North America. Retrieved June 22, 2018, from https://diatoms.org/species/gomphoneis_minuta

Responses

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