Hannaea arcus

(Ehrenberg) Patrick 1966      Category: Araphid
BASIONYM: Navicula arcus Ehrenberg 1836
SYNONYM(S): Ceratoneis arcus  (Ehrenberg) Kützing  

Halamphora veneta

 

Hippodonta capitata
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LM scalebar = 10 µm = 40 pixels.

Observations

Contributor: Pat Kociolek - December 2010
Length Range: 15-80 µm
Width Range: 4-7 µm
Striae in 10 µm: 13-14

Description

Valves are asymmetric to the apical axis; the dorsal margin is highly arched and convex, while the ventral margin is concave. A central, unilateral swelling is present on the ventral margin. Ghost striae may be present in the central swelling. Valve apices are capitate to attenuate. A narrow, distinct central sternum is present. One to two rimoportulae are present at the valve apices.

Original Description

Basionym: Navicula arcus
Author: Ehrenberg 1836
Length Range: µm
Striae in 10 µm:

Original Description

Original Images

Cite This Page:
Kociolek, P. (2010). Hannaea arcus. In Diatoms of the United States. Retrieved May 19, 2013, from http://westerndiatoms.colorado.edu/taxa/species/hannaea_arcus

Species: Hannaea arcus

Contributor: Pat Kociolek

Reviewer: Sarah Spaulding

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Image Credit: Pat Kociolek, Megan Otu

  1. Apices capitate to attenuate
  2. Dorsal margin convex
  3. Central, unilateral swelling on the ventral margin
  4. One to two rimoportulae

Apices are capitate to attenuate. Dorsal margin is highly arched and convex, the ventral margin is concave with a unilateral swelling of the central area. The central sternum is distinct and narrow. A rimoportula is present near the valve ends and is often visible in the light microscope. Striae are parallel.

Compare

Hannaea arcus is distinguished from H. arcus var. amphioxys by a steeper angle of the ventral margin and a more abruptly swollen central central area in H. arcus var. amphioxys. Hannaea arcus is smaller and more stout than H. superiorensis, a species found only in the upper Great Lakes.

Hannaea arcus var. amphioxys

Hannaea superiorensis

Bixby and Edlund

Citations

Bixby, R.J. and Jahn, R. (2005). Hannaea arcus (Ehrenberg) R.M. Patrick: lectotypification and nomenclatural history. Diatom Research 20: 210-226.

Bixby, R.J., Edlund, M.B., and Stoermer, E.F. (2005). Hannaea superiorensis sp. nov., an endemic diatom from the Laurentian Great Lakes. Diatom Research 20: 227–240.

Krammer, K. and Lange-Bertalot, H. (1986). Bacillariophyceae. 1. Teil: Naviculaceae. In: Ettl, H., J. Gerloff, H. Heynig and D. Mollenhauer (eds.) Susswasserflora von Mitteleuropa, Band 2/1. Gustav Fisher Verlag, Jena. 876 pp.

Patrick, R.M. and Reimer, C.W. (1966). The Diatoms of the United States exclusive of Alaska and Hawaii, V. 1. Monographs of the Academy of Natural Sciences of Philadelphia 13.

Links & ID's

Index Nominum Algarum (INA)

Original INA
Transfer INA

California Academy of Sciences (CAS)

Hannaea arcus CAS

North American Diatom Ecological Database (NADED)

NADED ID: 39001

Autecology Discussion

Hannaea arcus is found in cool flowing water in mountainous regions across the US.

Habits

Size Range

101-1000 µm3 (ie Amphora veneta)

Motility

non motile

Attachment

unattached

Habitat

planktonic

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

Hannaea arcus

Distribution

The distribution map represents the relative abundance of this Hannaea arcus 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 Hannaea arcus was not recorded, or with a red circle indicating the relative abundance of Hannaea arcus.

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

Hannaea arcus

Responses

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

 

April 3, 2013 - Citation correction

The transfer of Ceratoneis arcus (Ehrenberg) Kützing to Hannaea arcus Patrick 1961 was listed incorrectly as occurring in Patrick and Freese 1961. The transfer should appear as Hannea arcus Patrick (Patrick and Reimer 1966, pg. 132). - S. Spaulding