Navicula erifuga

Lange-Bertalot in Krammer and Lange-Bertalot 1985      Category: Symmetrical biraphid
SYNONYM(S): Navicula leptocephala Brébisson ex Grunow in Van Heurck 

Navicula duerrenbergiana

 

Navicula escambia
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LM scalebar = 10 µm = 80 pixels.

Observations

Contributor: Marina Potapova - May 2009
Length Range: 21-36 µm
Width Range: 5–7 µm
Striae in 10 µm: 12–14

Description

Valves are lanceolate with acutely rounded ends. The raphe is filiform. The central portions of the raphe branches and proximal raphe ends are deflected toward the primary side. Terminal raphe fissures are hooked towards the secondary side. The axial area is narrow and linear. The central area is asymmetric, "bow-tie" shaped on the primary side and crescent-shaped at the secondary side. The lineolate striae are radiate, becoming convergent at the valve apices. Striae number 12-14 in 10 µm and areolae number 30-35 in 10 µm.

Cite This Page:
Potapova, M. (2009). Navicula erifuga. In Diatoms of the United States. Retrieved May 25, 2013, from http://westerndiatoms.colorado.edu/taxa/species/Navicula_erifuga

Species: Navicula erifuga

Contributor: Marina Potapova

Reviewer: Sarah Spaulding

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Image Credit: Marina Potapova

  1. Wedge-shaped ends
  2. Proximal raphe ends deflected
  3. Distal raphe ends hooked
  4. Central area asymmetric

Valves are lanceolate and 21-36 µm long by 5-7 µm wide. The central raphe ends are deflected and the central area is asymmetric.

Compare

The proximal raphe ends of N. erifuga are slightly deflected, while both N. libonensis and N. recens possess straight proximal raphe ends. Valves of N. lanceolata are broader than N. erifuga, have straight central raphe ends and the central area is symmetric. Valves of N. viridulacalcis are nearly linear and larger in size.

Navicula recens

Navicula lanceolata

Navicula libonensis

Navicula viridulacalcis

Lange-Bertalot

Citations

Krammer, K. and Lange-Bertalot, H. (1985). Naviculaceae Neue und wenig bekannte Taxa, neue Kombinationen und Synonyme sowie Bemerkungen zu einigen Gattungen. Bibliotheca Diatomologica 9:5-230, 43 pls.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

Navicula erifuga CAS

North American Diatom Ecological Database (NADED)

NADED ID: 46648

Autecology Discussion

N. erifuga prefers brackish water or fresh water of high mineral content, eutraphentic.

Habits

Size Range

101-1000 µm3 (ie Amphora veneta)

Motility

moderately motile (e.g. Navicula tripunctata)

Attachment

unattached

Habitat

benthic

Colony

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

Navicula erifuga

Distribution

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

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

Navicula erifuga

Responses

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