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首页> 外文期刊>oecologia >The distribution and prevalence of helminths, coccidia and blood parasites in two competing species of gecko: implications for apparent competition
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The distribution and prevalence of helminths, coccidia and blood parasites in two competing species of gecko: implications for apparent competition

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Across the Pacific the invading gecko speciesHemidactylus frenatushas competitively displaced the resident gecko speciesLepidodactylus lugubrisin urban/surburban habitats. Do parasites enhance, inhibit, orhave no effect on this invasion? Parasites can confer an advantage to an invading species when the invader (1) introduces a new parasite to a resident species that has a greater detrimental effect on the resident than the invader, (2) is less susceptible to endemic parasites than the resident, and/or (3) increases the susceptibility of the resident to parasites. Conversely, parasites may protect a resident against invasion when endemic parasites have a greater impact on the invader than the resident. We screened more than one thousandH. frenatusandL. lugubrisin areas of sympatry and allopatry from 28 islands and 5 sites on mainland Asia for a broad array of blood parasites, coccidia and helminths in order to evaluate the potential for parasites to affect their interaction. We found that 1) There were no parasites which appear to protectL. lugubrisagainst invasion byH. frenatus. 2)H. frenatusdoes not introduce the same parasite toL. lugubrisin every location where the two come in to contact, but probably has introduced different parasites in different locations.L. lugubrisalso seems to have introduced at least one parasite toH. frenatus. 3) The prevalence of parasite species shared by the two hosts is generally higher inH. frenatus; however, prevalence is determined by many factors and cannot be directly translated as susceptibility. We discuss the implications of this difference in prevalence for the Red Queen hypothesis. 4) The prevalence of the cestodeCylindrotaeniasp. is significantly higher inL. lugubristhat are sympatric withH. frenatusthan those which are allopatric.

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