Gomphonema kobayasii | Species - Diatoms of North America

Category

Asymmetric Biraphid
Length Range

10-30 µm
Width Range

3.5-5.0 µm
Striae in 10 µm

9-12

Contributor

Pat Kociolek - Jan 2011
Reviewer

Marina Potapova - Apr 2011

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Identification

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Description

Valves are linear-clavate with headpole rounded, footpole narrowly rounded. The striae are parallel to radiate, strongly radiate at the footpole and uniseriate. The axial area is narrow at the poles, widening towards the central area. The central area is broadly rectangular with shortened striae on either side; the central striae are more widely spaced than the others. A stigma is located in the central area. The raphe is straight and lateral, with external proximal raphe ends dilated slightly.

Note that the present concept of this species is based on the variation of the type population. This species is either variable in US material, or there are a number of species within the species complex. Specimens with a more narrow axial area or more elongate valve are reported by analysts. Further studies are necessary to establish species limits for this and closely related species.

Autecology

Size Range, µm3

101-1000
Motility

Moderately motile
Attachment

Vertical
Habitat

Benthic
BCG

BCG 2
Waterbody

Inland
Distribution

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

Original Description

Author

Kociolek and Kingston 1999
Length Range

10.5-30.0 µm
Width

3.5-5.0 µm
Striae in 10µm

9-12

Original Images

Citations & Links

Citations

Kociolek, J.P. and Kingston, J.C. (1999) Taxonomy, ultrastructure, and distribution of some gomphonemoid diatoms (Bacillariophyceae: Gomphonemataceae) from rivers in the United States Canadian Journal of Botany 77: 686-705

Publication Link: 10.1139/cjb-77-5-686

Cite This Page

Kociolek, P. (2011). Gomphonema kobayasii. In Diatoms of North America. Retrieved December 21, 2024, from https://diatoms.org/species/45540/gomphonema_kobayasii

Responses

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