Age-Stage, Two-Sex Life Tables of the Predatory Mite Cheyletus Malaccensis Oudemans at Different Temperatures.

Weiwei Sun,Qing Yu,Miao Cui,Liyuan Xia,Yang Cao,Yi Wu

doi:10.3390/insects11030181

Weiwei Sun, Qing Yu + Show 4 more

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https://doi.org/10.3390/insects11030181

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Journal: Insects	Publication Date: Mar 12, 2020
Citations: 8	License type: CC BY 4.0

Affiliation: Academy of State Administration of Grain

Abstract

Cheyletus malaccensis Oudemans is a predatory mite inhabiting grain depots in China. The relationship between temperature and the population growth rate of C. malaccensis is useful for predicting its population dynamics. Age-stage, two-sex life tables of the predator, C. malaccensis, reared on Acarus siro were constructed under laboratory conditions at 22, 24, 28, 30, and 32 °C, 75% relative humidity, and a 0:24 h (L:D) photoperiod. Increasing temperature shortened the development time of the immature stages. The complete generation time of C. malaccensis ranged from 11.10 d to 27.50 d. Life table parameters showed that 28 °C was the optimum temperature for the growth and development of C. malaccensis; populations could increase rapidly at this temperature. The highest net reproductive rate (R0 = 290.25) and highest fecundity (544.52) occurred at 28 °C. Temperature significantly affected the intrinsic rate of increase (r), fecundity, and finite rate of increase (λ). The values of age-specific fecundity (high to low) were 28 °C > 24 °C > 30 °C > 32 °C > 22 °C, while the values of age-stage-specific fecundity had the same trend.

Highlights

Cheyletus malaccensis Oudemans is a predator mite species in China
The results provided basic information for biological control programs that use C. malaccensis
The shortest developmental time for the egg stage was at 32 ◦ C and the longest was at 22 ◦ C in both females and males

Summary

Introduction

Cheyletus malaccensis Oudemans is a predator mite species in China. It preys on acarid grain mites and small arthropods, such as the eggs and first-instar larvae of stored grain pests [1,2,3]. C. malaccensis populations can be self-sustaining for limited time periods by cannibalism [4,5]. C. malaccensis is the dominant predaceous mite species in grain depots [6,7,8,9,10] and provides biological control of common pests in stored grain [11]. C. malaccensis development includes five stages: egg, larvae, protonymph, deutonymph, and adult. Virgin females always produce males, whereas fertilized females produce both male and female progeny [12,13]

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