plant-insect-coevolution
Plant-insect coevolution examines how plants and insects reciprocally shape one another's traits over evolutionary time, from chemical defenses to specialized feeding structures. This dynamic drives the diversification of plant secondary metabolites, resin and volatile compounds, and physical adaptations that deter herbivores or attract pollinators. Understanding these interactions helps researchers explain patterns of plant chemical diversity, resistance strategies, and ecosystem-level relationships between flora and their insect partners.
open_in_new WikipediaPubMed · 2026-06-27
Two closely related flies that form galls on rubber rabbitbrush evolved into separate species surprisingly fast — in under 110,000 years — because each became so genetically locked to its specific host plant variety that it can't survive on the other's plant.
The two fly species diverged into reproductively isolated species in only 72,000–110,000 years, an unusually rapid rate of speciation.
Purebred flies and even first- and second-generation hybrids failed to successfully induce galls on the alternate host plant variety, demonstrating near-complete 'immigrant inviability'.
Genomic analysis showed high genetic differentiation (FST) and low gene flow between the two species despite living in the same geographic area, confirming that host-plant specialization alone drove their separation.
