International Directory of Botanical Gardens V. PDF Download

Author: Heikki Simola
Publisher:
ISBN:
Category : Arboretums
Languages : en
Pages : 616

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Author: Jacob John
Publisher:
ISBN:
Category : Diatoms
Languages : en
Pages : 532

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Author: Herman van Dam
Publisher: Springer Science & Business Media
ISBN: 9401736227
Category : Science
Languages : en
Pages : 530

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Book Description
The Twelfth International Diatom Symposium stressed how diatoms can be used to assess the human impact on natural waters, without neglecting other important fields of research. As the frustules of many diatom species are relatively resistant to dissolution they are preserved in freshwater and marine sediments and provide a record of past environments on earth. In past decades they have been successfully used to reconstruct changes in water bodies evoked by changes in salinity, acidification and eutrophication. In the last few years diatom-inferred predictions of environmental variables have become much more quantitative. In the most recent research reports the strong separation between palaeolimnological and neolimnological diatom research is fading, as palaeolimnologists are increasingly using modern calibration sets to infer past states of the environment. This quantitative approach is also very suitable for prediction of future changes in the biota of surface waters. Also ecological changes due to climatic modification have been investigated more thoroughly recently. A very important new research topic is the occurrence of toxic diatoms, particularly along the coasts of North America. These proceedings are intended to be a balanced view of such modern developments in diatom research. They should also be of interest to non-specialists in diatoms, who can use the results of diatom research as a tool in a more general taxonomic, ecological and geological context.

Author: Heikki Simola
Publisher: Balogh Scientific Books
ISBN: 9783874293075
Category : Diatoms
Languages : en
Pages : 592

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Author:
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 76

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Author:
Publisher: Academy of Natural Sciences
ISBN: 9781437955460
Category :
Languages : en
Pages : 244

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Author: Geological Survey (U.S.)
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 436

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Author: Geological Survey (U.S.)
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 650

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Book Description

Author: K. Duff
Publisher: Springer Science & Business Media
ISBN: 9401708096
Category : Science
Languages : en
Pages : 196

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Chrysophycean algae are a diverse and often abundant group of primarily freshwater phytoplankton, characterized by the endogenous formation of siliceous cysts or stomatocysts (also called statospores or statocysts). Cyst morphology is highly variable, but believed to be species-specific. Recently, cysts have received considerable attention from phycologists and especially paleoecologists who wish to use these indicators for assessments of environmental change. Nonetheless, attempts at using cysts have often been hampered by taxonomic problems. This Atlas dispels some of the mystery surrounding stomatocysts, facilitating the accurate identification of individual cyst morphotypes, and encouraging other workers to begin using these important indicators. The terminology used to describe cysts is outlined in detail, followed by detailed descriptions of cyst morphotypes, following International Statospore Working Group (ISWG) guidelines, complemented by scanning electron and light micrographs, as well as line illustrations. Any available biogeographical and ecological information is also provided. These descriptions will further accelerate the continued effort to link cyst morphotypes to the algae that produce them. For paleoecologists who wish to include stomatocysts in their studies, researchers working with living chrysophycean algae, and those interested in the morphology and ultrastructure of cyst morphotypes.

Author: Frank Eric Round
Publisher: J. Cramer in der Gebrüder Borntraeger Verlagsbuchhandlung
ISBN:
Category : Science
Languages : en
Pages : 456

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