Tritrophic interactions between parasitoids and cereal aphids are mediated by nitrogen fertilizer. (19th December 2014)

• Record Type: Journal Article
• Authors: Aqueel, Muhammad A.; Raza, Abu‐bakar M.; Balal, Rashad M.; Shahid, Muhammad A.; Mustafa, Irfan; Javaid, Muhammad M.; Leather, Simon R.
• Is Part Of: Insect science. Volume 22:Number 6(2015:Dec.)
• Page Start: 813
• Page End: 820
• Publication Date: 2014-12-19
• Subjects: cereal aphid parasitoids -- nitrogen fertilization -- tritrophic interactions; Insects -- Periodicals; Entomology -- Periodicals; 595.705
• DOI: 10.1111/1744-7917.12123
• Languages: English
• ISSNs: 1672-9609

Abstract

Abstract: Host plant nutritional quality can directly and indirectly affect the third trophic levels. The aphid–parasitoid relationship provides an ideal system to investigate tritrophic interactions (as the parasitoids are completely dependent for their development upon their hosts) and assess the bottom up forces operating at different concentrations of nitrogen applications. The effects of varying nitrogen fertilizer on the performance of Aphidius colemani (V.) reared on Sitobion avenae (F.) and Aphidius rhopalosiphi (D.) reared on Rhopalosiphum padi (L.) were measured. Parasitism and percent emergence of parasitoids were positively affected by nitrogen fertilizer treatments while developmental duration (egg, larval, and pupal stages) was not affected by increasing nitrogen inputs. In males and females of both parasitoid species, adult longevity increased with the increasing nitrogen fertilizer. Hind tibia length and mummy weight of both parasitoid species increased with nitrogen fertilizer concentrations, as a result of larger aphids. This study showed that nitrogen application to the soil can have important consequences for aboveground multitrophic interactions.