Atlas of Chrysophycean Cysts by Katharine E. Duff, Barbara A. Zeeb, John P. Smol (auth.)

By Katharine E. Duff, Barbara A. Zeeb, John P. Smol (auth.)

Chrysophycean algae are a various and infrequently considerable staff of essentially freshwater phytoplankton, characterised via the endogenous formation of siliceous cysts or stomatocysts (also referred to as statospores or statocysts). Cyst morphology is extremely variable, yet believed to be species-specific.
lately, cysts have obtained significant cognizance from phycologists and particularly paleoecologists who desire to use those symptoms for tests of environmental switch. still, makes an attempt at utilizing cysts have frequently been hampered through taxonomic difficulties.
This Atlas dispels many of the secret surrounding stomatocysts, facilitating the exact id of person cyst morphotypes, and inspiring different staff to start utilizing those vital signs. The terminology used to explain cysts is printed intimately, by way of specific descriptions of cyst morphotypes, following foreign Statospore operating crew (ISWG) directions, complemented via scanning electron and lightweight micrographs, in addition to line illustrations. Any to be had biogeographical and ecological info is additionally supplied. those descriptions will additional speed up the ongoing attempt to hyperlink cyst morphotypes to the algae that produce them.
For paleoecologists who desire to comprise stomatocysts of their experiences, researchers operating with residing chrysophycean algae, and people attracted to the morphology and ultrastructure of cyst morphotypes.

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This stomatocyst cannot LM DESCRIPTION: distinguished from stomatocysts 53 and 152 with LM . be REFERENCES: This stomatocyst is widespread. , 1992 (9) Fig. 27 BIOLOGICAL AFFINITY: unknown LOCALITY: "Col Pond" (unofficial name), Cape Herschel (78°37'N ; 74°42'W), Ellesmere Island, Northwest Territories, Canada. Net tow , collected July 24, 1986. ), British Columbia, Canada (Duff & SEM DESCRIPTION: This stomatocyst is identical to stomatocysts 52, 234, and 197 (Chapter 5), except that the size is different; the size ranges for these cysts are given under stomatocyst 52.

This volume) (12) Fig. 25 BIOLOGICAL AFFINITY: This stomatocyst is likely 42 Fig. 25. Stomatocyst 52. A: SEM . B: Line drawing of SEM. Scale bar = 2 JLffi. See Figs. 12C, D for LM. produced by more than one species. Nygaard (1956) suggested that it was produced by a Chromulina species, based on the descriptions of Huber-Pestalozzi (1941). P. A. 25 cm) sediment sample. SEM DESCRIPTION: This is an emended description of stomatocyst 52, based on new observations. The size range and diagnostic criteria have been redefmed.

ECOLOGY: This cyst appears to be tolerant of a wide range ECOLOGY: In most paleolimnological studies, this cyst was counted as a collective category, and so the ecological information that could be gleaned from its stratigraphic distribution is limited. In Elk Lake, Minnesota, it flourished during the warm, dry climate of the mid-Holocene (Zeeb & Smol, 1993b). , 1992). with Secchi disk depth in a survey of freshwater lakes (Duff, 1994). , 1994). Columbia, Canada, it was more common in large, clear, circumneutrallakes (Duff, 1994).

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