Nematology , 2004, Vol. 6(6), 883-890 The influence of temperature on the life history of the Antarctic nematode Panagrolaimus davidi Ian M. B ROW N 1 , David A. W HARTON 2 , ∗ and Russell B. M ILLAR 3 1 Department of Biology, Georgia Southwestern State University, Americus, GA 31709, USA 2 Department of Zoology, University of Otago, P.O. Box 56, Dunedin, New Zealand 3 Department of Statistics, University of Auckland, Private Bag 92019, Auckland, New Zealand Received: 3 September 2004 Accepted for publication: 30 September 2004 Summary – Panagrolaimus davidi is a free-living microbivore, associated with moss and algal patches in coastal regions around Ross Island, Antarctica. In laboratory experiments, temperature had a major influence on P. davidi life history parameters. The optimal temperature occurred between 25 and 30 ◦ C and the temperature at which population growth ceased was estimated at 6.8 ◦ C. Threshold temperatures for developmental processes were in the range 4.1 ◦ C (for egg incubation) to 7.6 ◦ C (for generation time). The life history strategy of P. davidi shows r -selected features and is more similar to temperate free-living nematodes than to other polar species, which show K-selected features. In
Nematology – Brill
Published: Jan 1, 2004
Keywords: R-K-A SELECTION; POPULATION GROWTH; THRESHOLD TEMPERATURES; THERMAL TIME; INTRINSIC RATE OF NATURAL INCREASE
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