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Lygodium microphyllum (Old World climbing fern) is one of the most problematic weeds in south Florida, invading numerous habitats from mangroves to pine flatwoods natural ecosystems. Much of the research efforts on L. microphyllum has been focused on reproductive potential, spore release, growth under different environmental conditions, belowground rhizome dormancy and survival strategies that describes its invasiveness. However, the role of an important mutualistic association with arbuscular mycorrhizal fungi (AMF) in the competitive ability and successful invasion of L. microphyllum by enhancing nutrient uptake has not been previously considered. Analysis of field root and soil samples from the ferns introduced and native range as well as a seven-week growth chamber experiment were done to determine the level of mycorrhizal colonization in the roots of L. microphyllum and the dependency on mycorrhizal fungi for growth and phosphorus (P) uptake. The field root samples showed that L. microphyllum was heavily colonized by AMF in relatively dry conditions, which are commonly found on some Florida sites compared to wet sites where the fern is found in its native Australia. The results from the growth chamber experiment showed that the mycorrhizal treatment plants had significantly higher relative growth rate and biomass compared to the non-mycorrhizal plants. Similarly, L. microphyllum was highly dependent on the

Influence of Soil Biogeochemical Properties on the Invasiveness of Old World Climbing Fern (Lygodium microphyllum)