title: Low susceptibility of invasive red lionfish (Pterois volitans) to a generalist ectoparasite in both its introduced and native ranges.
abstract: Escape from parasites in their native range is one of many mechanisms that can contribute to the success of an invasive species. Gnathiid isopods are blood-feeding ectoparasites that infest a wide range of fish hosts, mostly in coral reef habitats. They are ecologically similar to terrestrial ticks, with the ability to transmit blood-borne parasites and cause damage or even death to heavily infected hosts. Therefore, being highly resistant or highly susceptible to gnathiids can have significant fitness consequences for reef-associated fishes. Indo-Pacific red lionfish (Pterois volitans) have invaded coastal habitats of the western tropical and subtropical Atlantic and Caribbean regions. We assessed the susceptibility of red lionfish to parasitic gnathiid isopods in both their native Pacific and introduced Atlantic ranges via experimental field studies during which lionfish and other, ecologically-similar reef fishes were caged and exposed to gnathiid infestation on shallow coral reefs. Lionfish in both ranges had very few gnathiids when compared with other species, suggesting that lionfish are not highly susceptible to infestation by generalist ectoparasitic gnathiids. While this pattern implies that release from gnathiid infestation is unlikely to contribute to the success of lionfish as invaders, it does suggest that in environments with high gnathiid densities, lionfish may have an advantage over species that are more susceptible to gnathiids. Also, because lionfish are not completely resistant to gnathiids, our results suggest that lionfish could possibly have transported blood parasites between their native Pacific and invaded Atlantic ranges.
authors.affiliation: Department of Biological Sciences, Arkansas State University, Jonesboro, Arkansas, United States of America.
authors.forename: Paul C
authors.initials: PC
authors.lastname: Sikkel
authors.affiliation: Department of Integrative Biology, Oregon State University, Corvallis, Oregon, United States of America.
authors.forename: Lillian J
authors.initials: LJ
authors.lastname: Tuttle
authors.affiliation: The Marine Laboratory, University of Guam, Mangilao, Guam; School of Plant Biology and Oceans Institute, The University of Western Australia, Crawley, Australia.
authors.forename: Katherine
authors.initials: K
authors.lastname: Cure
authors.affiliation: Department of Biological Sciences, Arkansas State University, Jonesboro, Arkansas, United States of America.
authors.forename: Ann Marie
authors.initials: AM
authors.lastname: Coile
authors.affiliation: Department of Biology, University of Hawai'i at Mānoa, Honolulu, Hawai'i, United States of America.
authors.forename: Mark A
authors.initials: MA
authors.lastname: Hixon
mesh_terms: D000818:Animals; D004478:Ectoparasitic Infestations; D005393:Fish Diseases / Q000469:parasitology*; D058865:Introduced Species; D033321:Isopoda; D010473:Perciformes / Q000469:parasitology*