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Growth and consumption rates of bacterivorous Antarctic naked marine amoebae

Citation

Mayes, D and Rogerson, A and Marchant, H and Laybourn-Parry, J, Growth and consumption rates of bacterivorous Antarctic naked marine amoebae, Marine Ecology - Progress Series, 160 pp. 101-108. ISSN 0171-8630 (1997) [Refereed Article]

DOI: doi:10.3354/meps160101

Abstract

This is the first study to consider the growth and feeding rates of naked marine amoebae at temperatures below 5°C. Specific growth rates were calculated for 5 Antarctic isolates, Platyamoeba australis, Mayorella sp., Metachaos sp., Vannella sp., and an unidentified vahlkampfiid amoeba. Growth rates ranged between 0.08 x 10 -2 and 2.9 x 10 -2 h -1 corresponding to generation times of 866.2 and 23.9 h, respectively. All isolates grew at temperatures down to -2°C and showed optimal growth at 2°C although one species grew best at 0°C. A direct counting method was used to estimate bacterial feeding rates of P. australis and the vahlkampfiid amoeba. Rates varied as a function of prey density but were largely independent of temperature. Overall, amoebae consumed between 0.5 and 66.4 bacteria amoeba -1 h -1 , equivalent to 0.3 and 38.0 pg C cell -1 h -1 . Growth efficiencies estimated for these 2 amoebae were low, typically < 2%, suggesting that amoebae incur high energetic costs for life at low temperatures.

Item Details

Item Type:Refereed Article
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Marine and Estuarine Ecology (incl. Marine Ichthyology)
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Environmental Sciences
Author:Laybourn-Parry, J (Professor Johanna Laybourn-Parry)
ID Code:49451
Year Published:1997
Web of Science® Times Cited:12
Deposited By:Research Division
Deposited On:2008-04-01
Last Modified:2011-08-15
Downloads:0

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