Journal article
Aulacoseira canadensis and Aulacoseira crassipunctata (Bacillariophyta) in North America
Nova Hedwigia, pp 167-184
01 Jan 2009
Abstract
The heavily silicified and coarsely ornamented Aulacoseira canadensis (Hustedt) Simonsen and Aulacoseira crassipunctata Krammer are morphologically similar and often confused in collections from North America. Re-examination of samples and permanent slides from several collections derived from biological monitoring and research programs allowed Lis to clarify their ecology and spatial distribution. The extinct A. canadensis was widely distributed in Miocene times in northwestern North America. Its occurrence in recent benthic diatom samples is due to erosion of diatomites located in catchments of rivers and lakes. A. canadensis may be conspecific with Melosira youngi Skvortzov M. praegranulata Jouse, and M. praeislandica Jouse, which are other Miocene diatoms described and frequently reported from East Asia. Previously known from northern Europe, A. crassipunctata is restricted in North America to the eastern part of the continent. Living populations are found along the East Coast from South Carolina to Labrador and westward to northern Quebec and northern Minnesota. As deduced from fossil assemblages, A. canadensis probably required slightly acidic oligotrophic waters of low conductivity and high dissolved organic carbon. Lakes and streams that support A. crassipunctata have low conductivity, high dissolved organic carbon, and a pH of 5-6. Under the light microscope these taxa may be distinguished by shape of the ringleist, size of the mantle areolac, and distance between the mantle areolae. They also differ by the presence of rimoportulae (found only in A. canadensis) and shape of the linking spines.
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Details
- Title
- Aulacoseira canadensis and Aulacoseira crassipunctata (Bacillariophyta) in North America
- Creators
- Loren Bahls - Hannaea, Helena, MT 59601 USAMarina Potapova - Acad Nat Sci Philadelphia, Philadelphia, PA 19103 USAMarie-Andree Fallu - Univ Quebec, Dept Chim Biol, Trois Rivieres, PQ G9A 5H7, CanadaReinhard Pienitz - Univ Laval, Dept Geog, Ctr Etud Nord, Lab Paleolimnol & Paleoecol, Quebec City, PQ G1K 7P4, Canada
- Publication Details
- Nova Hedwigia, pp 167-184
- Publisher
- Gebruder Borntraeger
- Number of pages
- 18
- Grant note
- DPDC database
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Biodiversity, Earth, and Environmental Science (BEES); Diatom Herbarium
- Web of Science ID
- WOS:000264856800012
- Other Identifier
- 991019170580004721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Plant Sciences