Changes in arthropod community but not plant quality benefit a specialist herbivore on plants under reduced water availability

Po-An Lin, Chia-Ming Liu, Jia-Ang Ou, Cheng-Han Sun, Wen-Po Chuang, Chuan-Kai Ho, Natsuko Kinoshita & Gary Felton
Plants growing under reduced water availability can affect insect herbivores differently, in some instances benefitting them. However, the forces mediating these positive impacts remain mostly unclear. To identify how water availability impacts plant quality and multitrophic interactions, we conducted manipulative field studies with two populations of the specialist herbivore Pieris rapae, and its host plant, Rorippa indica. We found that P. rapae larvae experienced higher survival on R. indica growing under low water availability compared...
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