Identification

Description

Valves are linear-clavate with a broadly rounded headpole. In some specimens, the headpole may possess an acute tip. The footpole is narrow and subcapitate to capitate. The raphe is filiform, straight and does not reach the margin at either pole. The two raphe branches are usually of unequal lengths. Striae are usually short and near the margin, composed of two or more isolated areolae. The footpole has a higher stria density near the terminus. Stigmata, septa and pseudosepta are lacking.

Autecology

Original Description

  • Basionym
    Gomphonema grovei
  • Author
    M.Schmidt in M.Schmidt et al. 1899

EMAP Assessment

EMAP Distribution

Gomphosphenia Grovei   Schmidt   Lange  Bertalot 20
Map 20

Response Plots

Gomphosphenia Grovei   Schmidt   Lange  Bertalot

Cite This Page

Kociolek, P. (2011). Gomphosphenia grovei. In Diatoms of North America. Retrieved July 18, 2018, from https://diatoms.org/species/gomphosphenia_grovei

Responses

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