Abstract
The effect of soil moisture on population dynamics of Paronychiurus kimi (Collembola) was examined by combining an empirical soil moisture model with a temperature-sensitive, stage-structured population model. Field observations of soil temperature were used to drive the population model, and simulations were compared to field observations of juvenile and adult densities. Simulations without soil moisture effects produced stable, interyear population dynamics and a significant correlation between simulations and observations (n=12, r 2=0.40, P<0.05) but overestimated densities during much of the year. Adding responses to soil moisture improved the fit between simulations and observations (n=13, r 2=0.40), suggesting that soil moisture is a major limiting factor on field populations of P. kimi. Moreover, an observed temporary decline in field populations during spring could be explained partly by the effects of an herbicide, paraquat (N,N′-dimethyl-gamma,gamma′-bipyridylium dichloride) (r 2=0.45), suggesting that paraquat imposes additional limits on collembolan populations.
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This work was supported by an award from the Department of Energy (DEAI0202ER63381).
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Choi, W.I., Moorhead, D.L., Neher, D.A. et al. A modeling study of soil temperature and moisture effects on population dynamics of Paronychiurus kimi (Collembola: Onychiuridae). Biol Fertil Soils 43, 69–75 (2006). https://doi.org/10.1007/s00374-005-0062-5
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DOI: https://doi.org/10.1007/s00374-005-0062-5