Synedra goulardii

Bréb. ex Cleve and Grunow 1880      Category: Araphid
SYNONYM(S): Fragilaria ulna var. goulardi (Bréb.) Lange-Bert. 1980 
GENUS CONSIDERED: Ulnaria

Synedra famelica

 

Synedra mazamaensis
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LM scalebar = 10 µm = 40 pixels.

Observations

Contributor: Ian Bishop - November 2015
Length Range: 33-119 µm
Width Range: 8.5-10.5 at center; 8.6-12.4 at maximum µm
Striae in 10 µm: 9-12

Description

Valves are linear-lanceolate with a distinctly constricted mid-valve. The apices are rostrate to subcapitate, and apiculate. The axial area is linear and very narrow. The central area is large, circular, and sometimes asymmetric. Smaller specimens may have short marginal striae in the center valve. Striae are parallel, becoming slightly radiate at the apices. Ghost striae are present in the central area, although they are more visible in larger specimens. Each valve has two rimoportula, with a rimoportula positioned at each apex.

Original Description

Basionym:
Author: Bréb. ex Cleve and Grunow 1880
Length Range: 57-80 µm
Width Range: 9, 8 in the middle µm
Striae in 10 µm: 10.5

Original Description

S. Goulardi Brébisson in litteris. Schaalen in der Mitte etwas verengt, an den Enden zugespitzt, 0,057-0,080 mm. breit, in der Mitte 0,008 mm., Querstreifen 10 1/2 in 0,01 mm., an den Enden schwach radial in der Mitte auf einem fast quadratischen Raume sehr matt (bei schwacher Vergrösserung fehlend). Buenos Ayres, Portorico, Kamtschatka, Jenissey. Taf. VI, Fig. 119 200/1.

Original Images

Cite This Page:
Bishop, I. (2015). Synedra goulardii. In Diatoms of the United States. Retrieved April 23, 2018, from http://westerndiatoms.colorado.edu/taxa/species/synedra_goulardi

Species: Synedra goulardii

Contributor: Ian Bishop

Reviewer: Eduardo A. Morales

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Image Credit: Ian Bishop

  1. Mid-valve constriction
  2. Two rimoportula per valve
  3. "Ghost" striae in central area
  4. Parallel striae, becoming radiate at ends
  5. Shortened, interrupted striae bordering central area

Valves are distinctly constricted at mid-valve. Striae are parallel, becoming slightly radiate at the apices. “Ghost” striae may be present in the central area. Each valve has two rimoportula, one at either end, near the apices.

Compare

Synedra goulardii is shorter than Ulnaria contracta, has a more dramatically constricted central area and more apiculate ends.

Ulnaria contracta

Citations

Cleve, P.T. and Grunow, A. (1880). Beiträge zur Kenntniss der Arktischen Diatomeen. Kongliga Svenska-Vetenskaps Akademiens Handlingar, 17(2): 121 pp., 7 pls.

Schwarzwalder, R.N. and Postek, M.T. (1981). Valve morphology of Synedra goulardi (Bacillariophyceae). Journal of Phycology 17: 412-414.

Williams, D. M. (1986). Comparative morphology of some species of Synedra Ehrenb. with a new definition of the genus. Diatom Research, 1 (1): 131-152.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

Synedra goulardi CAS

North American Diatom Ecological Database (NADED)

NADED ID: 66065

Autecology Discussion

Habits

Size Range

1001-10,000 µm3 (ie Diatoma vulgaris)

Motility

non motile

Attachment

Habitat

benthic

Colony

EMAP Assessment

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). Over 1200 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

Synedra goulardi

Distribution

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

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

Synedra goulardi

Responses

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