Population parameters and growth ofRiptortus pedestris(Fabricius) (Hemiptera: Alydidae) under elevated CO₂concentrations

Abstract

We evaluated the direct effects of three different CO2 concentrations (400, 600 and 1,000 ppm) on the population parameters and growth of the bean bug, Riptortus pedestris, while being fed on soybean. The raw life history data from R. pedestris was analyzed using an age‐stage, two‐sex life table to take the viable development rate among individuals into account. Based on the age‐stage, two‐sex life table analysis, the population projections of R. pedestris provide the stage structure and variability of the population growth under different CO2 treatments. Our results showed significantly shorter immature durations and higher pre‐adult survival rate under elevated CO2 (1,000 ppm) than those under ambient CO2 (400 ppm). The population of R. pedestris reared under elevated CO2 conditions showed higher intrinsic and finite rates of increase but a lower mean generation time than R. pedestris reared under ambient CO2 conditions. Our results show the population parameters and growth of R. pedestris are influenced by increased CO2 relative to ambient CO2 treatment. Further studies on the long‐term direct effects of different CO2 levels on R. pedestris are essential to understand their population dynamics and to establish appropriate management strategies.

Modelling the current and future potential distribution of the bean bug Riptortus pedestris with increasingly serious damage to soybean

“…For example, in analyses of curve responses, BIO08 contains a relatively high probability that R. pedestris will be present when the mean temperature of the wettest quarter is between 20 and 37°C. In addition, the increase in habitat suitability in future projections under RCP 2.6 and RCP 8.5 reinforces a more recent investigation showing that the length of the immature stages and pre‐adult survival rates were significantly shorter and higher, respectively, under elevated CO 2 concentrations 28 …”

“…In addition, the increase in habitat suitability in future projections under RCP 2.6 and RCP 8.5 reinforces a more recent investigation showing that the length of the immature stages and pre-adult survival rates were significantly shorter and higher, respectively, under elevated CO 2 concentrations. 28 Land use under the effects of human activities represents a series of important factors determining species distribution. 70 In this study, the four land-use variables contribute 19.3% to the resulting map, and overall show less importance relative to the climate predictors.…”

“…[20][21][22][23][24] Assessing the distribution pattern of suitable habitats of potential and known pests can provide vital references for policymaking to manage and control them, and in this field, SDM has been widely applied to predict the potential distribution of pest species and to identify factors shaping their distribution pattern. [25][26][27] Although intense attention has been given to R. pedestris in recent years, most studies on this pest have focused on population dynamics and damage to soybean, 9,28,29 chemical ecology, 11,29,30 genomics and molecular biology, 8,31,32 and insecticide resistance and gut symbionts. 33,34 No investigation on the potential distribution of R. pedestris has been conducted to date, and the effects of ecological and anthropogenic factors on the distribution pattern of this important pest remain unknown, which greatly impedes the prevention and control of this pest.…”

Effect of Different Plants on the Growth and Reproduction of Thrips flavus (Thysanoptera: Thripidae)

“…A life table is an important method to study the mechanism of insect population dynamics [28,29]. The net reproductive rate, intrinsic rate of increase, developmental rate, survival rate, and fecundity can be used to evaluate the adaptability of insects on host plants.…”

Population Parameters and Growth of Riptortus pedestris (Fabricius) (Hemiptera: Alydidae) under Fluctuating Temperature

“…The intrinsic rate of increase includes contributions of age of initial reproduction, the peak of reproduction, length of the reproductive period, and the survival rate of the population. Population parameters are principal demographic parameters and are particularly useful when predicting the growth potential of insect populations [45,[58][59][60][61][62][63]. Based on the intrinsic rate of increase values obtained in the present study, we established that fluctuating temperatures have different effects on R. pedestris development and reproduction, dependent on the ranges of temperature fluctuation to which these bugs were exposed.…”