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Abstract

Lake Fidler and Sulphide Pool are small, dystrophic, meromictic
lakes adjacent to the Gordon River in South-west Tasmania. Partitioning
between upper and lower waters is very distinct in both lakes, and a
stratification of microorganisms is situated about a particularly abrupt
redoxcline at around three metres depth in Lake Fidler and two metres
depth in Sulphide Pool. A special close-interval sampler was
developed specifically to sample the fine zonation of these organisms.
The microbial stratification in Lake Fidler comprises small flagellate
algae, colourless sulphur bacteria, and green photosynthetic bacteria.
In Sulphide Pool a similar stratification occurs but lacks colourless
sulphur bacteria. Extremely large standing crops of photosynthetic
bacteria are present in the two lakes, and the algae of the stratified
communities are also present in large numbers, particularly in Sulphide
Pool. The organisms of the microbial arrays which photosynthesise do so
at very low levels of red light. The physicochemical limnology of the
lakes, structure of the microbial stratifications, and the taxonomy,
ecology and physiology of the organisms within them, are described..
Many of the organisms present in the surface waters of the two lakes
are Chrysophytes. This group of algae has not been studied previously in
Australia, and the large number of Chrysophytes discovered in Lake Fidler
and Sulphide Pool prompted an Australia-wide survey of these organisms.
Three new Chrysophytes are described, and many more are reported for the
first time in the southern hemisphere.

Item Type:	Thesis - PhD
Authors/Creators:	Croome, RL
Keywords:	Limnology, Lakes, Chrysophyceae
Copyright Holders:	The Author
Copyright Information:	Copyright 1984 the Author - The University is continuing to endeavour to trace the copyright owner(s) and in the meantime this item has been reproduced here in good faith. We would be pleased to hear from the copyright owner(s).
Additional Information:	Appendix V appears to be a pre-print of an article finally published as: RL Croome and PA Tyler, 1985, Structure and ecology of the flagellate Scourfieldia caeca (Korsh.) Belcher & Swale in two meromictic lakes in Tasmania, Australian Journal of Marine and Freshwater Research 36(3) 413 - 419 with the DOI 10.1071/MF9850413 Appendix VI appears to be a post-print of and article finally published as: Roger L. Croome, Peter A. Tyler, 1984, The Microanatomy and ecology of ‘Chlorochromatium aggregatunf in two meromictic lakes in Tasmania, Journal of general microbiology, 130, 2717-2723 with the DOI 10.1099/00221287-130-10-2717 AppendixVII appears to be a pre-print of an article finally published as: Croome, R., Dürrschmidt, M. & Tyler, P. 1985, A light and electron microscopical investigation of Mallomonas splendens (G. S. West) Playfair (Mallomonadaceae, Chrysophyceae), Nova Hedwigia 41: 463–8. AppendixVII appears to be the pre-peer reviewed version of the following article: Dürrschmidt, Monika, Croome, Roger, 1985, Mallomonadaceae (Chrysophyceae) from Malaysia and Australia, Nordic Journal of Botany, 5(3) 285-298, which has been published in final form at 10.1111/j.1756-1051.1985.tb01657.x. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.
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