Halamphora montana | Species - Diatoms of North America

Category

Asymmetric Biraphid
Length Range

12-20 µm
Width Range

3-4.5 µm
Striae in 10 µm

Difficult to resolve in LM

Contributor

Joshua Stepanek, Pat Kociolek - Jan 2011
Reviewer

Rex Lowe - Mar 2011

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Identification

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Description

Valves are semi-lanceolate, with a smoothly arched dorsal margin, and straight to slightly convex ventral margin. Valve ends are protracted, narrowly rostrate and ventrally curved. The raphe is located near the middle of the valve, gently arched with proximal raphe ends slightly deflected dorsally. The axial area is narrow, although somewhat difficult to resolve on the ventral side. The central area on the dorsal side forms a thickened semi-stauros extending to the dorsal valve margin, a ventral fascia is present and extends to the ventral valve margin. Dorsal and ventral striae are difficult to resolved in LM.

Autecology

Size Range, µm3

101-1000
Motility

Slightly motile Moderately motile
Attachment

Prostrate
Habitat

Benthic
Colony

Solitary
BCG

BCG 4
Waterbody

Inland
Distribution

Western rivers 2004 Southeast rivers 2014 California coastal rivers 2017 Northeast lake sediments
Learn more about this

Original Description

Basionym

Amphora montana
Author

Krasske 1932
Length Range

9-15 µm
Width

4-6 µm
Striae in 10µm

36

Original Images

Citations & Links

Citations

Cite This Page

Stepanek, J., Kociolek, P. (2011). Halamphora montana. In Diatoms of North America. Retrieved December 21, 2024, from https://diatoms.org/species/45413/halamphora_montana

Responses

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