Nutritional Ecology of Parasitoid Wasps

The nutritional ecology of parasitoid wasps explores how these hymenopteran insects acquire, allocate and utilise dietary resources to support survival, reproduction and host exploitation. Adult females must balance the energetic costs of oviposition and flight with the need for carbohydrates, most commonly obtained from floral nectar, honeydew or guttation, while larval stages rely entirely on host-derived nutrients. Variation in resource availability influences egg maturation rates, longevity and foraging behaviour, creating trade-offs between egg-limited and time-limited reproductive strategies. Understanding these interactions is crucial for optimising conservation biological control, as landscape-level management of plant resources can enhance the fitness and efficacy of parasitoids in suppressing pest populations. Recent advances have integrated field, laboratory and molecular approaches to reveal mechanisms of nutrient uptake, storage and metabolic regulation across species and habitats, informing sustainable pest management worldwide.

Research from Nature Portfolio

Recent studies have examined the effect of winter flower strips on aphid biological control under temperate conditions. Field trials coupled with laboratory experiments showed that provision of winter floral resources did not alter parasitism rates by common aphid-attacking wasps and that pollinator visits exerted no competitive pressure on parasitoid foraging. This finding supports the deployment of winter nectar-provisioning plantings without undermining biological control. In parallel, investigations into nectar-providing plants for brassica systems identified alyssum as uniquely capable of extending parasitoid longevity and realised fecundity while conferring no benefit to target pest species, thereby illustrating the importance of selective floral resource choice in conservation interventions.

Nutritional Ecology of Parasitoid Wasps publication trend

The graph below shows the total number of articles in nutritional ecology of parasitoid wasps across all publications each year (not limited to Nature Index journals).

Technical terms

Extrafloral nectar: Sugary secretion produced by plant structures outside of flowers, exploited by insects for energy intake.

Floral nectar: Nutrient-rich liquid produced within flowers that provides carbohydrates and other compounds to visiting insects.

Honeydew: Sugar-rich excretion from sap-feeding insects, often utilised by parasitoids and other beneficial insects.

Guttation droplets: Xylem and phloem fluid exuded at leaf margins, containing water, carbohydrates and proteins.

Egg load: Number of mature eggs carried by a female parasitoid, reflecting reproductive capacity.

Conservation biological control: Agricultural practice of managing habitats and resources to enhance natural enemies of pests.

References

1. Egg load dynamics and the risk of egg and time limitation experienced by an aphid parasitoid in the field. Ecology and Evolution (2014).
2. No evidence for competition over floral resources between winter-active parasitoids and pollinators in agroecosystems. Scientific Reports (2024).
3. Alyssum (Lobularia maritima) selectively attracts and enhances the performance of Cotesia vestalis, a parasitoid of Plutella xylostella. Scientific Reports (2020).
4. Plants for Fitness Enhancement of a Coffee Leaf Miner Parasitoid. Agriculture (2023).
5. Plant guttation provides nutrient-rich food for insects. Proceedings of the Royal Society B (2020).
6. Fitness Effects of Food Resources on the Polyphagous Aphid Parasitoid, Aphidius colemani Viereck (Hymenoptera: Braconidae: Aphidiinae). PLOS ONE (2016).