Diatoms of North AmericaDiatoms of North America

Navicula galloae

Bahls 2011

Navicula Galloae Guide
  • Category
    Symmetric Biraphid
  • Length Range
    85-113 µm
  • Width Range
    12.0-14.0 µm
  • Striae in 10 µm
    10-11

Identification

Navicula galloae LM1 Navicula galloae LM2 Navicula galloae LM3 Navicula galloae LM4 Navicula galloae LM5 Navicula galloae LM6
View image metadata
Navicula galloae SEM3 Navicula galloae SEM2 Navicula galloae SEM1

Description

Valves are narrowly lanceolate with gradually attenuated and rounded ends. The axial area is narrow and linear. The central area is small, rounded, and asymmetric, larger on the secondary side. The central nodule is asymmetric and wider on the primary side. The raphe is filiform to weakly lateral. Proximal raphe raphe fissures end in small hooks, which are deflected slightly to the secondary side. Each hook is divided at its center by a narrow tongue of silica. Striae are radiate, becoming parallel and finally convergent toward the ends. Areolae are relatively coarse and constant in number at 24 in 10 µm.

Autecology

Navicula galloae has been recorded at three sampling stations on Snow Creek, a headwater tributary of the Deschutes River, and in the North Umpqua River, all in the Cascade Mountains of western Oregon. These streams have slightly alkaline waters (pH ranges from 6.9 to 7.6) and low concentrations of dissolved solids (specific conductance ranges from 24 to 53 µS/cm).

Snow Creek Or Orsnw1010 2191
Credit: Kirsten Gallo, Siuslaw National Forest
Snow Creek, Deschutes County, Oregon.

Original Description

Valves narrowly linear-lanceolate with gradually attenuated and rounded apices. Length 85-113 μm, width 12.0-14.0 μm. Axial area narrow, central area small, rounded, and somewhat asymmetric, larger on the secondary side. Raphe filiform to weakly lateral. Central raphe fissures end in small bifurcated pores, which are deflected slightly to the secondary side (Figure 2G, I); distal raphe fissures hooked, the hooks opening toward the secondary side. Striae radiate, becoming parallel and finally convergent toward the ends, 10-11 in 10 μm. Areolae relatively coarse (more so than in N. radiosa Kützing) and fairly constant at 24 in 10 μm, visible in LM.

  • Author
    Bahls 2011
  • Length Range
    85-113 µm
  • Width
    12.0-14.0 µm
  • Striae in 10µm
    10-11

Original Images

Ngalloae Origimage
Ngalloae Origdesc1

Cite This Page

Bahls, L. (2011). Navicula galloae. In Diatoms of North America. Retrieved April 25, 2024, from https://diatoms.org/species/navicula_galloae

Responses

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