Fecha de Publicación: 12 Mar 2019
Cita: J.L. Herrera-Giraldo, C.E. Figuerola-Hernández, N.D. Holmes, K. Swinnerton, E.N. Bermúdez-Carambot, J.F. González-Maya and D.A. Gómez-Hoyos. 2019. Survival analysis of two endemic lizard species before, during and after a rat eradication attempt on Desecheo Island, Puerto Rico. In: C.R. Veitch, M.N. Clout, A.R. Martin, J.C. Russell and C.J. West (eds.) (2019). Island invasives: scaling up to meet the challenge, pp. 191–195. Occasional Paper SSC no. 62. Gland, Switzerland: IUCN.

Survival analysis of two endemic lizard species before, during and after a rat eradication attempt on Desecheo Island, Puerto Rico

This study focused on the survivorship of two reptile species because of the high conservation value of these single-island endemics. Rodenticide application risk assessments should also consider the role of lizards as prey items, and thus as potential toxin pathways to other native species. Food web models that include rodenticide introduction can inform risk assessments, including potential pathways and levels of exposure. Residue analyses can help confi rm these assessments. Ultimately, risk assessments for rodent eradication operations using toxicants must evaluate the cost and benefi t impacts of these eff orts (i.e. negative impacts from using toxicants versus positive impacts from removing rats)

Proceedings of the international conference on island invasives 2017

Edited by C.R. Veitch, M.N. Clout, A.R. Martin, J.C. Russell and C.J. WestOccasional Paper of the IUCN

Species Survival Commission N 62

Rodent eradications are a key island restoration activity to counteract extinction and endangerment to native species. Despite the widespread use of brodifacoum as a rodenticide for island restoration, there has been little examination of its potential negative eff ects on native reptiles. Here we examined the survival of two endemic insular lizard populations before, during and after a brodifacoum-based rodent eradication using a mark-recapture study. We found no evidence of an eff ect from baiting in Anolis desechensis and evidence of a change in recapture rates after baiting for Ameiva desechensis.

Effects of baiting on survival rates were not measurable due to a small sample size. Results suggest that brodifacoum did not result in population-level impacts during the three-week study period after brodifacoum exposure. For invasive species eradications using toxicants, potential risks to non-target species should be assessed against the expected benefi ts to native biota from the removal of threats posed by invasive mammals. We recommend continued studies that directly examine non-target risk to native reptile populations derived from toxicant baiting programs, particularly on tropical islands that are home for high numbers of endemic reptiles.

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