Lygodium microphyllum (Old World climbing fern)
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1 Australia/New Zealand Weed Risk Assessment adapted for Florida. Data used for analysis published in: Gordon, D.R., D.A. Onderdonk, A.M. Fox, R.K. Stocker, and C. Gantz. 28. Predicting Invasive Plants in Florida using the Australian Weed Risk Assessment. Invasive Plant Science and Management : Lygodium microphyllum (Old World climbing fern) Question number Question Answer Score. Is the species highly domesticated? n.2 Has the species become naturalised where grown?.3 Does the species have weedy races? 2. Species suited to Florida's USDA climate zones (-low; -intermediate; 2-high) Quality of climate match data (-low; -intermediate; 2-high) Broad climate suitability (environmental versatility) y 2.4 Native or naturalized in habitats with periodic inundation y 2.5 Does the species have a history of repeated introductions outside its natural y range? 3. Naturalized beyond native range y 3.2 Garden/amenity/disturbance weed n 3.3 Weed of agriculture n 3.4 Environmental weed n 3.5 Congeneric weed y 4. Produces spines, thorns or burrs n 4.2 Allelopathic n 4.3 Parasitic n 4.4 Unpalatable to grazing animals 4.5 Toxic to animals n 4.6 Host for recognised pests and pathogens 4.7 Causes allergies or is otherwise toxic to humans n 4.8 Creates a fire hazard in natural ecosystems y 4.9 Is a shade tolerant plant at some stage of its life cycle y 4. Grows on infertile soils (oligotrophic, limerock, or excessively draining soils) 4. Climbing or smothering growth habit y 4.2 Forms dense thickets y 5. Aquatic n
2 5.2 Grass n 5.3 Nitrogen fixing woody plant n 5.4 Geophyte n 6. Evidence of substantial reproductive failure in native habitat 6.2 Produces viable seed y 6.3 Hybridizes naturally 6.4 Self-compatible or apomictic y 6.5 Requires specialist pollinators n 6.6 Reproduction by vegetative fragmentation y 6.7 Minimum generative time (years) 7. Propagules likely to be dispersed unintentionally (plants growing in heavily trafficked areas) 7.2 Propagules dispersed intentionally by people y 7.3 Propagules likely to disperse as a produce contaminant n 7.4 Propagules adapted to wind dispersal y 7.5 Propagules water dispersed? 7.6 Propagules bird dispersed n 7.7 Propagules dispersed by other animals (externally) 7.8 Propagules dispersed by other animals (internally) n 8. Prolific seed production y 8.2 Evidence that a persistent propagule bank is formed (> yr) y 8.3 Well controlled by herbicides y 8.4 Tolerates, or benefits from, mutilation or cultivation y 8.5 Effective natural enemies present in Florida, or east of the continental divide Total Score 5 Outcome Reject* *Used secondary screen from: Daehler, C. C., J.L. Denslow, S. Ansari, and H. Kuo. 24. A risk assessment system for screening out harmful invasive pest plants from Hawaii s and other Pacific islands. Conserv. Biol. 8:
3 section # questions answered satisfy minimum? A 8 yes B 9 yes C 8 yes total 35 yes Data collected Question number Reference Source data. cultivated, but no evidence of selection for reduced weediness Pemberton and Ferriter (998) Old World climbing fern (Lygodium microphyllum), a dangerous invasive weed in Florida. American Fern Journal 88: Ferriter, ed. (2) Lygodium Management Plan Ferriter, ed. (2) Lygodium Management Plan 2.5 Pemberton and Ferriter (998) Old World climbing fern (Lygodium microphyllum), a dangerous invasive weed in Florida. American Fern Journal 88: Pemberton, Goolsby, and Wright (22) Old World climbing fern. Chp. in Van Driesche et the Eastern United States. USDA Forest Service Publication FHTET no evidence 3.3 no evidence 3.4 no evidence 3.5 Pemberton, Goolsby, and Wright (22) Old World climbing fern. Chp. in Van Driesche et "The aboveground portion of the plant is killed by frost, but it can recover if the temperatures are not low enough to kill the roots." "L. microphyllum has a very large native range, extending through much of the Old World tropics, spanning almost half of the world's circumference from 8 E in Senegal to 5 W in Tahiti between the latitudes of 29 S in Australia and 27 N in northeastern India (Alston 959, Copeland 994a, So 994b, Holttum 968)." "In its natural range, L. microphyllum is found in a variety of habitats including mesic forests, rain forest, and open swampy areas". "Lygodium microphyllum has been cultivated as an ornamental plant for many years." "Lygodium microphyllum also is naturalized to a limited extent in Jamaica and Guyana." L. japonicum is invasive in the southeastern U.S. 3
4 the Eastern United States. USDA Forest Service Publication FHTET Nauman (993) Lygodiaceae C. Presl. In Flora of North America. Volume 2. Oxford University Press, New York. Pp no description of these traits 4.2 no evidence 4.3 Nauman (993) Lygodiaceae C. Presl. In Flora of North America. Volume 2. Oxford University Press, New York. Pp no description of this no evidence Bruneton (999) Toxic Plants: Dangerous to Humans and Animals. Lavoisier Publishing, "Ferns are rarely harmful to humans"; Paris. "Allergies to ferns are very rare" 4.8 "Tall infestations by this fern can be a fire hazard because the dry dead fronds Weber (23) Invasive Plant Species of the are flammable and carry fires into the canopies of trees." 4.9. Pemberton, Goolsby, and Wright (22) Old World climbing fern. Chp. in Van Driesche et the Eastern United States. USDA Forest Service Publication FHTET Volin, Lott, Muss, and Owen (24) Predicting rapid invasion of the Florida Everglades by Old World climbing fern (Lygodium microphyllum). Diversity and Distributions : Volin, Lott, Muss, and Owen (24) Predicting rapid invasion of the Florida Everglades by Old World climbing fern (Lygodium microphyllum). Diversity and Distributions : Weber (23) Invasive Plant Species of the. "The plant can grow either in full sun or shade." 2. "its ability to grow in a low-light understorey environment" "L. microphyllum is a vine-like fern that climbs on trees and shrubs" "the numerous fronds build thick mats that completely smother whole plant communities" 5. terrestrial 5.2 Weber (23) Invasive Plant Species of the Schizaeaceae 5.3 Weber (23) Invasive Plant Species of the Schizaeaceae 5.4 Duncan (994) Ferns and Allied Plants of Victoria, Tasmania and South Australia. Melbourne University Press, Carlton, Victoria. fern roots are usually fine and fibrous Volin, Lott, Muss, and Owen (24) Predicting rapid invasion of the Florida Everglades by Old World climbing fern (Lygodium microphyllum). Diversity and Distributions : Volin, Lott, Muss, and Owen (24) Predicting rapid invasion of the Florida Everglades by Old World climbing fern (Lygodium microphyllum). "spores have a high germination rate and the resulting gametophytes have an equally high rate of sporophyte production" "The fern is able to reproduce by all three mating systems possible in homosporous ferns: intra- and 4
5 Diversity and Distributions : intergametophytic selfing and outcrossing." 6.5 fern 6.6 Weber (23) Invasive Plant Species of the short-creeping rhizomes 6.7 Lott, Volin, Pemberton, and Austin (23) The "Sexually mature gametophytes of L. reproductive biology of the invasive ferns microphyllum and L. japonicum were Lygodium microphyllum and L. japonicum observed within 5 wk of germination. (Schizaeaceae): implications for invasive Once sexual maturity was reached, potential. American Journal of Botany 9: sporophyte production began and continued rapidly through week 2." Pemberton and Ferriter (998) Old World climbing fern (Lygodium microphyllum), a dangerous invasive weed in Florida. American Fern Journal 88: "Lygodium microphyllum has been cultivated as an ornamental plant for many years." 7.3 no evidence 7.4 Pemberton, Goolsby, and Wright (22) Old World climbing fern. Chp. in Van Driesche et the Eastern United States. USDA Forest "The fern spreads over long distances Service Publication FHTET by wind-borne spores" 7.5 Ferriter, ed. (2) Lygodium Management Plan "Water and wind of storm events may help disperse millions of tiny spores over long distances, although little is known about Lygodium dispersal mechanisms." 7.6 unlikely for spores unlikely for spores 8.. Pemberton, Goolsby, and Wright (22) Old World climbing fern. Chp. in Van Driesche et the Eastern United States. USDA Forest 8.2 Service Publication FHTET Volin, Lott, Muss, and Owen (24) Predicting rapid invasion of the Florida Everglades by Old World climbing fern (Lygodium microphyllum). Diversity and Distributions : Ferriter, ed. (2) Lygodium Management Plan 8.3. Ferriter, ed. (2) Lygodium Management Plan for Florida. Florida Exotic Pest Plant Council s 2. Pemberton and Ferriter (998) Old World climbing fern (Lygodium microphyllum), a dangerous invasive weed in Florida. American Fern Journal 88: "The fern produces large numbers of spores; more than 8 spores/m3/hour were trapped" 2. "Each fertile leaflet could...potentially produce 28,6 spores" "Spores of the Lygodium genus have very thick walls, giving these propagules long environmental viability.". "Excellent control of L. microphyllum has been observed where Rodeo was applied at a rate of 8.8 l/ha (7.5 pt/acre)." BUT 2. "No effective method of control for the plant exists." 5
6 8.4 Ferriter, ed. (2) Lygodium Management Plan 8.5 "L. microphyllum is tolerant of fire" 6
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