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   Iguana iguana (reptile) English 
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         Impact global

    Competition and hybridization between Iguana iguana and the Lesser Antilles iguana, the 'Vulnerable 'VU' (Iguana delicatissima), are mentioned as the main causes of the virtual disappearance of the Lesser Antilles iguana from Iles des Saintes, Guadeloupe, in the second half of the 20th century (Breuil and Sastre, 1993). On Martinique, the green iguana which is larger and more opportunistic in its food choices than the endemic I. delicatissima may be a strong competitor for the latter (Breuil, 2002). Green iguana may compete for resources with the 'Critically Endangered (CR)' endemic Cayman island ground iguana (see Cyclura lewisi in IUCN Red List of Threatened Species) on Grand Cayman, if their ranges overlap in the future (Burton, 2003).

    While there are reports of juvenile green iguana being predated on by the Florida burrowing owl (Athene cunicularia floridana a species of 'Special Concern'); there are concerns that adult green iguana may venture into burrows of the owl and forage on eggs and hatchlings (McKie et al. 2005). In their native range green iguana are known to be herbivorous through their lifespan, however, juveniles have been reported to maybe, be omnivorous (Savage 2002). Analysis of stomach contents of 18 green iguanas by Townsend et al. (2005) as part of an ongoing study on the exotic herpetofauna and its management in Florida, discovered the remains of an arboreal snail Drymaeus multilineatus in two specimens, one with accompanying plant material (suggesting that they could have been ingested accidentally with plant material on which the snails were aestivating) and the other without (suggesting that they could have ingested the snails intentionally). The authors of this study point out that while D. multilineatus is widespread and in no immediate danger, increased numbers of green iguana could potentially impact on tree snails with restricted distributions, whose native range overlap with that of the green iguana.
    Green iguana are reported to be posing a collision hazard on airport runways in Puerto Rico (Engeman et al. 2005).
    The keeping of reptiles as pets has been cited as the source of a number of laboratory-confirmed cases of human salmonellosis associated with exposure to exotic pets including iguanas (Woodward et al. 1997).




         Étude de cas sur les impacts
    Basse-Terre (Guadeloupe) français  English 
    Compétition

    Hybridation
    Îles des Saintes (Guadeloupe) français  English 
    Compétition: La compétition et l'hybridation entre l’Iguane vert et l’Iguane des Petites Antilles (Iguana delicatissima), classé en danger par l'UICN (voir Iguana delicatissima dans la Liste rouge de l'UICN des espèces menacées), sont évoquées comme la principale cause de la quasi disparition de l’Iguane des Petites Antilles des Saintes pendant la seconde moitié du 20ème siècle (Breuil et Sastre, 1993).

    Hybridation
    Martinique français  English 
    Compétition: L’Iguane vert, de taille supérieure à l’Iguane des Petites Antilles (Iguana delicatissima) et plus opportuniste dans ses choix alimentaires, est un fort compétiteur face à ce dernier (Breuil, 2002), espèce endémique des Petites Antilles et classée vulnérable par l’UICN (voir Iguana delicatissima dans la Liste rouge de l'UICN des espèces menacées). Cependant, à l’heure actuelle, les populations de ces deux espèces ne semblent pas en contact, l’Iguane des Petites Antilles étant localisé sur l’îlet Chancel et dans des forêts difficiles d’accès au Nord.

    Hybridation
    Luis Munoz Marin International Airport (Puerto Rico) English 
    Nuisance pour les personnes: At the Luis Munoz Marin International Airport operations had to be halted six times within two months due to the hazard presented by the presence of iguanas on the tarmac.
    Saint Lucia English 
    Compétition: Predicted impacts include hybridization and competition with the native Saint Lucia iguana.

    Hybridation: Predicted impacts include hybridization and competition with the native Saint Lucia iguana.
    Florida (USA) (United States (USA)) English 
    Réduction de la biodiversité indigène: While there are reports of juvenile green iguana being predated on by the Florida burrowing owl (Athene cunicularia floridana a species of 'Special Concern'); there are concerns that adult green iguana may venture into burrows of the owl and forage on eggs and hatchlings (McKie et al. 2005). In their native range green iguana are known to be herbivorous through their lifespan, however, juveniles have been reported to maybe, be omnivorous (Savage 2002). Analysis of stomach contents of 18 green iguanas by Townsend et al. (2005) as part of an ongoing study on the exotic herpetofauna and its management in Florida, discovered the remains of an arboreal snail Drymaeus multilineatus in two specimens, one with accompanying plant material (suggesting that they could have been ingested accidentally with plant material on which the snails were aestivating) and the other without (suggesting that they could have ingested the snails intentionally). The authors of this study point out that while D. multilineatus is widespread and in no immediate danger, increased numbers of green iguana could potentially impact on tree snails in with restricted distribution, whose native range overlap with that of the green iguana.



ISSG Landcare Research NBII IUCN University of Auckland