Demographic Dynamics of Herbivorous Insect Populations
Summary
The demographic dynamics of herbivorous insects encompass the patterns and processes by which populations of plant-feeding species grow, fluctuate and interact with their environment. Central to this field are age-stage, two-sex life tables that capture the survival, development and reproduction of individuals across all life stages and both sexes. Studies integrate the effects of host-plant quality, temperature variation and interspecific interactions to model intrinsic rates of increase, net reproductive rates and generation times. Such insights underpin predictions of outbreak risk, inform integrated pest management and guide conservation of beneficial species. Recent advances have broadened from laboratory assays to field-based population projections, revealing how climatic shifts, agricultural practices and natural enemies collectively shape demographic trajectories on a global scale.
Research from Nature Portfolio
Recent studies have refined life-table analyses to improve laboratory rearing and mass-production of biocontrol agents. One study assessed the life-history parameters of a key cereal pest on wheat, maize and barley, showing that host-plant choice dramatically alters development time, fecundity and parasitism success of its egg parasitoid. These findings offer practical guidelines for optimising rearing systems and enhancing biological control efficiency. A foundational investigation compared the population growth of a major root-feeding weevil on its primary and alternative host plants, demonstrating that differences in developmental rate and female fecundity lead to divergent projections of population expansion. Together, these contributions exemplify how experimental life tables can be used to predict both pest outbreaks and the efficacy of natural enemies.
Demographic Dynamics of Herbivorous Insect Populations publication trend
The graph below shows the total number of articles in demographic dynamics of herbivorous insect populations across all publications each year (not limited to Nature Index journals).
Technical terms
Age-stage, two-sex life table: A demographic tool that records survival, development and reproduction for each age and stage of both sexes in a population.
Intrinsic rate of increase (r): The theoretical per capita growth rate of a population under ideal conditions, reflecting its potential to expand.
Net reproductive rate (R₀): The average number of offspring that an individual will produce over its lifetime, indicating long-term population growth.
Finite rate of increase (λ): The ratio by which a population multiplies per unit time, calculated as the exponential of the intrinsic rate of increase.
Generation time (T): The average interval between the birth of parents and the birth of their offspring, influencing the speed of population turnover.
References
- Life table study of Sitotroga cerealella on different cereals and its implications on the performance of the egg parasitoid (Trichogramma chilonis) under laboratory conditions. Scientific Reports (2023).
- Demographic comparison of sweetpotato weevil reared on a major host, Ipomoea batatas, and an alternative host, I. triloba. Scientific Reports (2015).
- Age-stage, two-sex life table of Parapoynx crisonalis (Lepidoptera: Pyralidae) at different temperatures. PLOS ONE (2017).
- Host-Plant Variations Affect the Biotic Potential, Survival, and Population Projection of Myzus persicae (Hemiptera: Aphididae). Insects (2021).
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