Understanding crop performance and pest control under climate change requires considering interactions among warming,...

Area of Science:

• Agroecosystem dynamics
• Climate change ecology
• Trophic interactions

Background:

• Climate change research often overlooks combined abiotic and biotic stressors.
• Understanding these interactions is crucial for predicting crop performance and pest control.

Purpose of the Study:

• To investigate the interactive effects of elevated temperature, CO2, and trophic interactions on a soybean agroecosystem.
• To assess how climate change affects biocontrol effectiveness by ladybeetles against aphids.

Main Methods:

• Empirical examination of a tri-trophic system (soybean, aphid, ladybeetle) under controlled environmental conditions.
• Manipulation of temperature (control, +2°C, +4°C) and CO2 (ambient, elevated) levels.
• Assessment of plant, herbivore, and predator traits.

Main Results:

• Abiotic factors (temperature, CO2) and trophic interactions significantly influenced soybean, aphid, and ladybeetle traits.
• Ladybeetle biocontrol of aphids was compromised under elevated temperature and CO2.
• Aphids reduced soybean seed production, but ladybeetles partially rescued it, though less effectively under stress.

Conclusions:

• Climate change research must incorporate abiotic-biotic interactions for improved predictability.
• Local climate-trophic interactions are vital for assessing regional food security.
• While species show plastic responses, evolutionary adaptation to climate change requires further study.