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Growth and consumption rates of bacterivorous Antarctic naked marine amoebae

journal contribution
posted on 2023-05-16, 20:47 authored by Mayes, D, Rogerson, A, Marchant, H, Laybourn-Parry, J
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.

History

Publication title

Marine Ecology - Progress Series

Volume

160

Pagination

101-108

ISSN

0171-8630

Publisher

Inter-Research

Place of publication

Germany

Repository Status

  • Restricted

Socio-economic Objectives

Expanding knowledge in the environmental sciences

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