Halamphora montana

(Krasske) Levkov 2009      Category: Asymmetrical biraphid
BASIONYM: Amphora montana Krasske 1932

Halamphora coffeaeformis

 

Halamphora normanii
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LM scalebar = 10 µm = 80 pixels.

Observations

Contributor: Joshua Stepanek | Pat Kociolek - January 2011
Length Range: 12-20 µm
Width Range: 3-4.5 µm
Striae in 10 µm: Difficult to resolve in LM

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.

Original Description

Basionym: Amphora montana
Author: Krasske 1932
Length Range: 9-15 µm
Width Range: 4-6 µm
Striae in 10 µm: 36

Original Description

Original Images

Cite This Page:
Stepanek, J., and Kociolek, P. (2011). Halamphora montana. In Diatoms of the United States. Retrieved May 18, 2013, from http://westerndiatoms.colorado.edu/taxa/species/halamphora_montana

Species: Halamphora montana

Contributor: Joshua Stepanek | Pat Kociolek

Reviewer: Rex Lowe

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Image Credit: Josh Stepanek

  1. Striation fine
  2. Semi-stauros
  3. Axial area narrow

Valves are semi-lanceolate. Valve ends are protracted, narrowly rostrate and bent ventrally. The raphe is located near the middle of the valve, gently arched, with proximal raphe ends with slight dorsal deflection. Axial area narrow. The central area on dorsal side forms a thickened semi-stauros extending to valve margin. Dorsal and ventral striae difficult to resolved in LM.

Compare

Halamphora montana is distinguished from H. normanii, H. pseudomontana, and H. submontana by its small size, fine striation, narrow axial area.

Halamphora normanii

Halamphora pseudomontana

(Cholnoky) Levkov

Halamphora submontana

(Hustedt) Levkov

Citations

Krasske, G. (1932). Beiträge zur Kenntnis der Diatomeenflora der Alpen. Nova Hedwigia 72(3): 92-135.

Levkov, Z. (2009). Amphora sensu lato. In Diatoms of Europe, Volume 5. (H. Lange-Bertalot, ed). A.R.G. Gantner Verlag K.G. 916pp.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

Halamphora montana CAS

North American Diatom Ecological Database (NADED)

NADED ID: 7042

Autecology Discussion

Habits

Size Range

101-1000 µm3 (ie Amphora veneta)

Motility

slightly motile (e.g. Cocconeis)
moderately motile (e.g. Navicula tripunctata)

Attachment

prostrate (e.g. mucilage pad)

Habitat

benthic

Colony

solitary

EMAP Assessment

Sampling for the Environmental Protection Agency (EPA) western Environmental Monitoring and Assessment Program (EMAP) study was completed during the years 2000-2004 (see citations at bottom of this page). Streams and rivers in 12 western states (Arizona, California, Colorado, Idaho, Montana, Nevada, North Dakota, Oregon, South Dakota, Utah, Washington and Wyoming). Over 1200 sites on streams and rivers in 12 western states (Arizona, California, Colorado, Idaho, Montana, Nevada, North Dakota, Oregon, South Dakota, Utah, Washington and Wyoming) were selected for sampling based on a stratified randomized design. This type of design insures that ecological resources are sampled in proportion to their actual geographical presence. Stratified randomized design also allows for estimates of stream length with a known confidence in several “condition classes” (good or least-disturbed, intermediately-disturbed, and poor or most-disturbed) for biotic condition, chemistry and habitat.

EMAP Distribution

Halamphora montana

Distribution

The distribution map represents the relative abundance of this Halamphora montana in the western EMAP study. Relative abundance is a measure of the proportion of cells of this species based on a "fixed count" of 300 total diatom cells counted and identified. Each of the western EMAP sample sites is shown, either with a black dot for sites where Halamphora montana was not recorded, or with a red circle indicating the relative abundance of Halamphora montana.

Note that the size of the proportional symbols varies between species to help show both abundant and rare species.

Scale for the map to the left

EMAP Response Plots

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.

EMAP citations

Results are published in:

Johnson, T., Hermann, K., Spaulding, S., Beyea, B., Theel, C., Sada, R., Bollman, W., Bowman, J., Larsen, A., Vining, K., Ostermiller, J., Petersen, D. Hargett, E. and Zumberge, J. (2009). An ecological assessment of USEPA Region 8 streams and rivers. U.S. Environmental Protection Agency Region 8 Report, 178 p.

Stoddard, J. L., Peck, D. V., Olsen, A. R., Larsen, D. P., Van Sickle, J., Hawkins, C. P., Hughes, R. M., Whittier, T. R., Lomnicky, G. A., Herlihy, A. T., Kaufman, P. R., Peterson, S. A., Ringold, P. L., Paulsen, S. G., and Blair, R. (2005). Environmental Monitoring and Assessment Program (EMAP) western streams and rivers statistical summary. U.S. Environmental Protection Agency Report 620/R-05/006, 1,762 p.

Stoddard, J. L., Peck, D. V., Paulsen, S. G., Van Sickle, J., Hawkins, C. P., Herlihy, A. T., Hughes, R. M., Kaufman, P. R., Larsen, D. P., Lomnicky, G. A., Olsen, A. R., Peterson, S. A., Ringold, P. L., and Whittier, T. R. (2005). An ecological assessment of western streams and rivers. U.S. Environmental Protection Agency Report 620/R-05/005, 49 p.