Evolution of growth traits in invasive Pereskia aculeata (Cactaceae): testing the EICA hypothesis using its specialist herbivore, Catorhintha schaffneri (Coreidae).

摘要: BACKGROUND Species introduced into new habitats are fitter than their native populations, as hypothesized by the 'evolution of increased competitive ability' (EICA). Here, Pereskia aculeata Miller was used a model to test EICA and explore how 'enemy release' may have influenced invasion success its 400-year-old populations (genotypes) compared with populations. Plant growth traits (height shoot length) 15 genotypes [four from range (South Africa) 11 (Brazil Argentina, Venezuela The Dominican Republic)] were assessed. Damage impact shoot-feeding, sap-sucking specialist Catorhintha schaffneri Brailovsky & Garcia on ten also compared. RESULTS All but one invasive significantly taller genotypes. Although relatively more damaged herbivory some genotypes, observed differences not explained completely origins. Nonetheless, findings partially supported predictions hypothesis because generally did fully support they always C. schaffneri. CONCLUSION Invasive had an advantage in can climb neighbouring vegetation quickly damage incurred relative suggests only that would be damaging South Africa, where it serves biocontrol agent, is distribution Brazil. © 2020 Society Chemical Industry.