A population growth model for Liposcelis entomophila (Enderlein) (Psocoptera: Liposcelididae)
Author of the article:WANG Zheng-Yan;HE Meng-Ting;LU Yu-Jie
Author's Workplace:School of Food Science and Technology, Henan University of Technology, Zhengzhou 450001, China;School of Food Science and Technology, Henan University of Technology, Zhengzhou 450001, China School of Food Science and Technology, Henan University of Technology, Zhengzhou 450001, China
Key Words:stored grain psocids; temperature; relative humidity; food breakage level; initial population density; life table; population growth model
Abstract:
[Objectives] To provide basic data
and theoretical models for the population forecasting of stored grain psocids. [Methods] Population growth models
of Liposcelis entomophila (Enderlein) were built under different environmental conditions. On the basis of age-stage
life tables of L. entomophila constructed in the laboratory, the effects of temperature, relative humidity,
food breakage level and initial population number on population dynamics were
evaluated. Exponential growth models of L.
entomophila population were validated and the functional relationship
between temperature, humidity and intrinsic rate of increase was modelled. [Results] Within a temperature range of 26-34°C,
relative humidity of 65%-85% and a food breakage level of 4%-12%, temperature
and relative humidity had significant effects on the developmental duration of L. entomophila, but not on the
population trend index, net reproduction, or the intrinsic rate of increase.
Temperature was the most important factor in the population growth of L. entomophila, followed by relative
humidity and food breakage level. The optimum conditions for population growth
are 34°C, 85% relative humidity and 12% food breakage. With an initial
population density of 0.26-1.04 adults/cm2, an exponential growth
model can be used to describe population growth. [Conclusion] Within a temperature range of 22-34°C and
a relative humidity of 65%-85%, the relationship between temperature, humidity
and population dynamics of L. entomophila can be expressed as Nt=N0EXP[(0.00296T+0.02167RH-0.0372)t].