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Effects of Yeast on the Growth and Development of Drosophila melanogaster and Pardosa pseudoannulata (Araneae: Lycsidae) Through the Food Chain

Yaqi Peng,Rui Liu,Wei Li,Yao Zhao,Yu Peng

Published 2025 in Insects

ABSTRACT

Simple Summary Pardosa pseudoannulata is a natural predator that helps control insect pests. Since yeast is known to improve the growth and reproduction of Drosophila melanogaster, we tested whether yeast in the flies’ diet affects both the flies and the spiders that eat them. We compared three diets for the flies: no yeast, active yeast, or inactivated yeast. Adding yeast helped fruit flies grow faster, increased their body weight, and boosted their fat, protein, and glucose levels. When spiders ate these yeast-fed flies, their early development (second instar) was faster, but yeast had no effect on their final size or weight. Yeast also increased the spiders’ fat content but did not change their protein or glucose levels. Our findings highlight how yeast in fruit-fly diets influences both flies and their spider predators.

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