Atlas of Chrysophycean Cysts

by Duff, Katharine E.; Zeeb, Barbara A.; Smol, John P.; Glew, John R.; Wilkinson, Anna N.

• ISBN13: 9780792371083
• ISBN10: 0792371089
• Format: Hardcover
• Copyright: 2001-12-01
• Publisher: Kluwer Academic Pub

Summary

Chrysophytes are a diverse and often abundant group of primarily freshwater algae that are 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. Cysts have continued to receive attention from phycologists and especially paleoecologists, who use these indicators for assessments of environmental change. In this volume, we have compiled descriptions, using both scanning electron and light microscopy, as well as line drawings, for 176 new cyst descriptions. In combination with the 155 morphotypes described in the first volume of the Atlas of Chrysophycean Cysts (Duff et al., 1995), we believe that most of the common stomatocysts found in north temperate freshwaters have now been described. This Atlas attempts to dispel some of the mystery surrounding stomatocysts, to facilitate the accurate identification of individual cyst morphotypes, and to encourage other workers to begin using these important indicators of environmental change. The terminology is outlined in detail. This is followed by detailed descriptions of cyst morphotypes, which continues from work completed in the first Atlas. Any available biogeographical and ecological information is also provided. We believe this Atlas will be useful to paleoecologists who wish to include stomatocysts in their studies. We also expect this book will be used by researchers working with living chrysophytes, and those interested in the morphology and ultrastructure of cyst morphotypes. Hopefully these descriptions will further accelerate the continued effort to link cyst morphotypes to the algae that produce them.

Author Biography

John P. Smol is a professor in the Biology Department at Queen's University (Canada), with a cross-appointment at the School of Environmental Studies. He co-directs the Paleoecological Environmental Assessment and Research Lab (PEARL). Professor Smol is co-editor of the Journal of Paleolimnology and holds the Canada Research Chair in Environmental Change.

Table of Contents

Acknowledgements	ix
Introduction	1	(2)
Introduction and Rationale for Vol II	1	(2)
Methods	3	(1)
Sample Collection and Preparation	3	(1)
Microscopy and Illustrations	3	(1)
Terminology	4	(4)
Cyst Descriptions	8	(137)
Map of site locations	9	(3)
Key	12	(1)
Stomatocysts lacking a collar or ornamentation	13	(1)
Stomatocysts with a simple conical collar but no ornamentation	14	(9)
Stomatocysts with a simple cylindrical collar but no ornamentation	23	(8)
Stomatocysts with a simple obconical collar but no ornamentation	31	(2)
Stomatocysts with a true or false complex collar but no ornamentation	33	(4)
Stomatocysts with ornamentation consisting of equidistant projections	37	(9)
Stomatocysts with ornamentation consisting of equidistant projections	46	(1)
Stomatocysts ornamented with scabrae	47	(4)
Stomatocysts ornamented with verrucae	51	(8)
Stomatocysts ornamented with conula	59	(7)
Stomatocysts ornamented with spines that are equidistant over entire cyst surface	66	(11)
Stomatocysts ornamented with spines concentrated in posterior hemisphere	77	(4)
Stomatocysts ornamented with long, non-bifurcating spines	81	(1)
Stomatocysts ornamented with short ridges; length is less than half of stomatocyst circumference	81	(7)
Stomatocysts ornamented with long ridges; length is greater than half of stomatocyst circumference	88	(8)
Stomatocysts ornamented with circuli	96	(10)
Stomatocysts ornamented with a reticulum	106	(10)
Stomatocysts ornamented with plateaux	116	(1)
Stomatocysts ornamented with fossae	117	(1)
Stomatocysts ornamented with psilae	118	(1)
Stomatocysts ornamented with circular depressions	119	(2)
Stomatocysts ornamented with spines and conula	121	(1)
Stomatocysts ornamented with spines and ridges	122	(2)
Stomatocysts ornamented with spines and circuli	124	(3)
Stomatocysts ornamented with spines and a reticulum	127	(4)
Stomatocysts ornamented with spines and indentations	131	(2)
Stomatocysts ornamented with projections and conula, spines or ridges	133	(6)
Stomatocysts ornamented with ridges and scabrae or verrucae	139	(2)
Stomatocysts ornamented with ridges and conula	141	(1)
Stomatocysts ornamented with more than two types of ornamentation	142	(3)
Unidentified stomatocysts Identified by LM only	145	(9)
Count Sheet	154	(6)
References	160	(4)
Stomatocyst Index	164	(5)
Species Index	169