THE STATOSPORE OF DINOBRYON DIVERGENS IMHOF: FORMATION AND GERMINATION IN A SUBARCTIC LAKE 1

SUMMARY The population dynamics and the sequences of statospore development and germination of Dinobryon divergens from a shallow subarctic lake were examined. D. divergens showed a sharp increase in the vegetative cell population between June 19 and July 3, 1973, followed by a rapid formation of st...

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Published in:Journal of Phycology
Main Authors: Sheath, Robert G., Hellebust, Johan A., Sawa, Takashi
Format: Article in Journal/Newspaper
Language:English
Published: Wiley 1975
Subjects:
Online Access:http://dx.doi.org/10.1111/j.1529-8817.1975.tb02760.x
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spelling crwiley:10.1111/j.1529-8817.1975.tb02760.x 2024-06-02T08:15:01+00:00 THE STATOSPORE OF DINOBRYON DIVERGENS IMHOF: FORMATION AND GERMINATION IN A SUBARCTIC LAKE 1 Sheath, Robert G. Hellebust, Johan A. Sawa, Takashi 1975 http://dx.doi.org/10.1111/j.1529-8817.1975.tb02760.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1529-8817.1975.tb02760.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1529-8817.1975.tb02760.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Phycology volume 11, issue 2, page 131-138 ISSN 0022-3646 1529-8817 journal-article 1975 crwiley https://doi.org/10.1111/j.1529-8817.1975.tb02760.x 2024-05-03T11:25:37Z SUMMARY The population dynamics and the sequences of statospore development and germination of Dinobryon divergens from a shallow subarctic lake were examined. D. divergens showed a sharp increase in the vegetative cell population between June 19 and July 3, 1973, followed by a rapid formation of statospores from June 26 to July 3. Shortly after spore production, this species decreased sharply to an insignificant level in the phytoplankton. Statospore formation to as initialed by migration of the monad cell to the lorica mouth and proceeded by rounding up of the cytoplasm. There was then an unequal cleavage, silica wall formation around the larger portion of the cytoplasm including the nucleus and disintegration of the extracystic cytoplasm after development of the plug. The statospore was uninucleate throughout its development, and it was concluded that spore formation occurred asexually. Germination of statospores was observed in periphyton samples at depths of 20 and 80 cm on July 20–21, 1973 and in the sediments earlier the following year. During germination a cellulose chamber was produced from the pore of the statospore, followed, by cleavage of the cytoplasm within the spore and migration of approximately 4 daughter protoplasts into the cellulose chamber from which they eventually escaped. The present study proposes that chrysophycean statospores arising asexually and endogenously should be recognized as separate entities from those formed isogamously and autogamously but not necessarily endogenously. The latter statospores resulting from the sexual process have been given the term zygospore. Article in Journal/Newspaper Subarctic Wiley Online Library Journal of Phycology 11 2 131 138
institution Open Polar
collection Wiley Online Library
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language English
description SUMMARY The population dynamics and the sequences of statospore development and germination of Dinobryon divergens from a shallow subarctic lake were examined. D. divergens showed a sharp increase in the vegetative cell population between June 19 and July 3, 1973, followed by a rapid formation of statospores from June 26 to July 3. Shortly after spore production, this species decreased sharply to an insignificant level in the phytoplankton. Statospore formation to as initialed by migration of the monad cell to the lorica mouth and proceeded by rounding up of the cytoplasm. There was then an unequal cleavage, silica wall formation around the larger portion of the cytoplasm including the nucleus and disintegration of the extracystic cytoplasm after development of the plug. The statospore was uninucleate throughout its development, and it was concluded that spore formation occurred asexually. Germination of statospores was observed in periphyton samples at depths of 20 and 80 cm on July 20–21, 1973 and in the sediments earlier the following year. During germination a cellulose chamber was produced from the pore of the statospore, followed, by cleavage of the cytoplasm within the spore and migration of approximately 4 daughter protoplasts into the cellulose chamber from which they eventually escaped. The present study proposes that chrysophycean statospores arising asexually and endogenously should be recognized as separate entities from those formed isogamously and autogamously but not necessarily endogenously. The latter statospores resulting from the sexual process have been given the term zygospore.
format Article in Journal/Newspaper
author Sheath, Robert G.
Hellebust, Johan A.
Sawa, Takashi
spellingShingle Sheath, Robert G.
Hellebust, Johan A.
Sawa, Takashi
THE STATOSPORE OF DINOBRYON DIVERGENS IMHOF: FORMATION AND GERMINATION IN A SUBARCTIC LAKE 1
author_facet Sheath, Robert G.
Hellebust, Johan A.
Sawa, Takashi
author_sort Sheath, Robert G.
title THE STATOSPORE OF DINOBRYON DIVERGENS IMHOF: FORMATION AND GERMINATION IN A SUBARCTIC LAKE 1
title_short THE STATOSPORE OF DINOBRYON DIVERGENS IMHOF: FORMATION AND GERMINATION IN A SUBARCTIC LAKE 1
title_full THE STATOSPORE OF DINOBRYON DIVERGENS IMHOF: FORMATION AND GERMINATION IN A SUBARCTIC LAKE 1
title_fullStr THE STATOSPORE OF DINOBRYON DIVERGENS IMHOF: FORMATION AND GERMINATION IN A SUBARCTIC LAKE 1
title_full_unstemmed THE STATOSPORE OF DINOBRYON DIVERGENS IMHOF: FORMATION AND GERMINATION IN A SUBARCTIC LAKE 1
title_sort statospore of dinobryon divergens imhof: formation and germination in a subarctic lake 1
publisher Wiley
publishDate 1975
url http://dx.doi.org/10.1111/j.1529-8817.1975.tb02760.x
https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1529-8817.1975.tb02760.x
https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1529-8817.1975.tb02760.x
genre Subarctic
genre_facet Subarctic
op_source Journal of Phycology
volume 11, issue 2, page 131-138
ISSN 0022-3646 1529-8817
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op_doi https://doi.org/10.1111/j.1529-8817.1975.tb02760.x
container_title Journal of Phycology
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