| Main Title |
Some Aspects of Morphological Variation in 'Stephanodiacus niagarae' (Bacillariophyceae). |
| Author |
Theriot, Edward ;
Stoermer, Eugene F. ;
|
| CORP Author |
Michigan Univ., Ann Arbor. Great Lakes Research Div.;Environmental Research Lab.-Duluth, MN. |
| Year Published |
1980 |
| Report Number |
EPA-805796; EPA-600/J-81-641; |
| Stock Number |
PB83-243766 |
| Additional Subjects |
Diatoms ;
Morphology ;
Lake Superior ;
Measurement ;
Diameters ;
Electron microscopes ;
Populations ;
Classifications ;
Identifying ;
Variations ;
Sediments ;
Comparison ;
Lake Michigan ;
Reprints ;
Stephanodiscus niagarae
|
| Holdings |
| Library |
Call Number |
Additional Info |
Location |
Last
Modified |
Checkout
Status |
| NTIS |
PB83-243766 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
| Collation |
12p |
| Abstract |
Valves of S. niagarae var. niagarae Ehr. and S. niagarae var. magnifica Fricke from geographically dispersed sediment and plankton collections were observed by light microscopy and scanning electron microscopy (LM and SEM). Measurements made by LM can be arranged so that means and ranges of diameter, areolar density, or strial density intergrade from one population into the next. Mean diameter is negatively related to increasing areolar and strial densities. No unique features observable by SEM distinguish the two described varieties. Thus, S. niagarae var. magnifica, having large diameter valves with low areolar and strial densities, may represent one end of a trend in overall variation in S. niagarae. At the opposite extreme are the populations with small valves and high areolar densities which are often erroneously referred to as S. astraea. Type material of S. niagarae lies intermediate to these forms. Three populations considered in this study have distinct morphological characteristics. |
| Availability Notes |
Pub. in Jnl. of Phycology 17, p64-72 1981. |
| NTIS Title Notes |
Journal article. |
| Title Annotations |
Reprint: Some Aspects of Morphological Variation in 'Stephanodiacus niagarae' (Bacillariophyceae). |
| PUB Date Free Form |
c1980 |
| Category Codes |
6M; 8H; 57K; 48G |
| NTIS Prices |
Not available NTIS |
| Primary Description |
600/03 |
| Document Type |
NT |
| Cataloging Source |
NTIS/MT |
| Control Number |
332921940 |
| Origin |
NTIS |
| Type |
CAT |
