Physiological ecology of the ciliated protozoon Loxodes

Finlay, B.J. and Fenchel, T. (1986) Physiological ecology of the ciliated protozoon Loxodes. In: Fifty-forth annual report for the year ended 31st March 1986. Ambleside, UK, Freshwater Biological Association, pp. 33-56. (Annual Report, Freshwater Biological Association, Ambleside)

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Abstract

Loxodes faces special problems in living close to the oxic-anoxic boundary. In tightly-stratified ponds like Priest Pot its optimum environment may be quite narrow and it can be displaced by the slightest turbulence. Loxodes cannot sense an O sub(2) gradient directly but its ability to perceive gravity allows it to make relatively long vertical migrations. It is also sensitive to light and oxygen and it uses these environmental cues to modulate the parameters of its random motility: in the dark, it aggregates at a low O sub(2) tension and in bright light it aggregates in anoxic water. The oxic-anoxic boundary is also a zone where O sub(2) may be a scarce and transient resource, but Loxodes) can switch to nitrate respiration and exploit the pool of nitrate that often exists close to the base of the oxycline.

Item Type: Book Section
Title: Physiological ecology of the ciliated protozoon Loxodes
Personal Creator/Author:
CreatorsEmail
Finlay, B.J.
Fenchel, T.
Title of Book: Fifty-forth annual report for the year ended 31st March 1986
Refereed: No
Series Name: Annual Report, Freshwater Biological Association, Ambleside
Page Range: pp. 33-56
Date: 1986
Publisher: Freshwater Biological Association
Place of Publication: Ambleside, UK
Issuing Agency: Freshwater Biological Association
Uncontrolled Keywords: Anoxic conditions; Dissolved oxygen; Ecophysiology; Freshwater lakes; Light effects; Physiochemical properties; Turbulence; Vertical migrations; Loxodes; England; Cumbria; Annual report
Subjects: Biology
Ecology
Item ID: 5244
Depositing User: Mrs Christine Davey
Date Deposited: 10 May 2011 16:59
Last Modified: 29 Sep 2011 15:14
URI: http://aquaticcommons.org/id/eprint/5244

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