Diatom
Online ISSN : 2186-8565
Print ISSN : 0911-9310
ISSN-L : 0911-9310
Morphometric comparison of the neotype of Asterionella formosa Hassall (Heterokontophyta, Bacillariophyceae) with Asterionella edlundii s p. nov. from Lake Hovsgol, Mongolia
Janice L. PappasEugene F. Stoermer
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JOURNAL FREE ACCESS

2003 Volume 19 Pages 55-65

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Abstract

We conducted a morphometric study to compare Asterionella specimens from Lake Hovsgol, Mongolia with the neotype specimens of A. formosa Hassan from the Glienicker See, Berlin, Germany. Specimens were digitized and measured for valve length, mid-valve width, head pole width, and foot pole width, and length to mid-valve ratio was calculated. Plots of morphometric measures revealed that specimens from Lake Hovsgol are not in the same size class as those from the Glienicker See. Size change series for each population revealed different rates of size diminution. For Lake Hovsgol specimens valve length change to mid-valve width change had a value of 0.217. For the neotype specimens of A. formosa, valve length change with respect to mid-valve width change was 0.41. A related rate, as a proxy for the relation between size diminution between each lake's population, had a value of 1.25 which indicates that each population vegetatively reproduces at a different rate. Cluster analysis using all morphometric measures resulted in Lake Hovsgol specimens aggregating in a group separate from the neotype A. formosa. With evidence of endemism being more prevalent in diatoms than what was once thought, genetic evidence of possible species differences among Asterionella in other lakes, and different environmental conditions between the two locales of Asterionella in this study, we propose that the Asterionella specimens from Lake Hovsgol are different from the neotypes of A. formosa and should be treated as A. edlundii Stoermer & Pappas sp. nov.

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© The Japanese Society of Diatomology
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