The demography of Paronychiurus kimi, a dominant collembolan in paddy fields of Korea, was quantified for four treatments of the herbicide paraquat (0, 1.6, 16, 160 and 1600[mu]g/cm.sup.2) in a controlled environment using plaster-of-Paris as the test substrate. The survival rate of adults and the reproductive fitness of P. kimi were not affected by paraquat except at the highest dosage (1600[mu]g/cm.sup.2), when fed baker's yeast and reared on plaster-charcoal substrate. However, results of life-history experiments suggest that fitness was maintained by a tradeoff between fecundity and reproductive period. It is suggested that these are potential life-history tradeoffs of Collembola that were exposed to the manufacturer's recommended concentration of paraquat (16[mu]g/cm.sup.2).
(a) Department of Plant and Soil Science, University of Vermont, 105 Carrigan Drive, Burlington, Vermont 05405, USA
(b) Division of Environmental Science and Ecological Engineering, College of Life and Environmental Sciences, Korea University, Anam-Dong, Sungbuk-Gu, Seoul 136-701, Republic of Korea
Received 24 April 2006; Revised 16 January 2007; Accepted 21 January 2007
Choi, Won Il, Deborah A. Neher, and Mun Il Ryoo. "Life-history trade-offs of Paronychiurus kimi (Lee) (Collembola: Onychiuridae) populations exposed to paraquat.(Author abstract)(Report)." Ecotoxicology and Environmental Safety 69.2 (2008): 227+. Academic OneFile. Web. 10 Nov. 2009.
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