Figure 1From: Plant genetic variation mediates an indirect ecological effect between belowground earthworms and aboveground aphidsThe model system used in this study consisted of four varieties of the broad bean plant ( Vicia faba ), with two aphid species ( Aphis fabae and Acyrthosiphon pisum ) and earthworms (presence or absence). Through this we were able to study direct and indirect effects of above-belowground interactions.Back to article page