Artigo

Density estimates of cane toads from native populations based on mark-recapture data

The cane toad (Bufo marinus) has received considerable attention because of its rapid spread in Australia and the potential threat it may represent to native species. Although the introduction of pathogens from native populations is now being considered to control this species, population estimates...

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Autor principal: Lampo, Margarita
Outros Autores: Bayliss, Peter G.
Grau: Artigo
Idioma: English
Publicado em: Wildlife Research 2020
Assuntos:
Cane Toad
Introduced Amphibian
Mark Recapture
Australia, South America
Bufo Marinus
Acesso em linha: https://repositorio.inpa.gov.br/handle/1/19408
id oai:repositorio:1-19408
recordtype dspace
spelling oai:repositorio:1-19408 Density estimates of cane toads from native populations based on mark-recapture data Lampo, Margarita Bayliss, Peter G. Cane Toad Introduced Amphibian Mark Recapture Australia, South America Bufo Marinus The cane toad (Bufo marinus) has received considerable attention because of its rapid spread in Australia and the potential threat it may represent to native species. Although the introduction of pathogens from native populations is now being considered to control this species, population estimates based on comparable methods that demonstrate that native populations are in fact less dense than the introduced ones are not available. Accurate population estimates are necessary to evaluate potential techniques for the control of the cane toad. We estimated population densities of cane toads over a wide range of habitat types and climate conditions by means of mark-recapture data. The capture history and location of toads each night were analysed to explore the validity of some of the assumptions of mark-recapture models. Because migrations, deaths and recruitment over three nights appear to be unimportant, populations may be legitimately regarded as closed for that period. However, cane toads seem highly sensitive to disturbance effects due to trapping and/or handling. Consequently, density estimates based on removal methods seem the most reliable because they are not sensitive to handling and trapping effects. Similarly, analyses of residuals of regressions between 1-night counts and density estimates suggested that toad nightly activity is affected by the air temperature during sampling. However, only 60% of the variation in estimated densities can be predicted by 1-night counts and air temperature. Estimates of population density over a wide range of habitats in South America were one order of magnitude lower than estimates in Australia. We speculate on the possible factors that may account for the lower densities in populations in the native range of the species. 2020-06-15T22:08:17Z 2020-06-15T22:08:17Z 1996 Artigo https://repositorio.inpa.gov.br/handle/1/19408 10.1071/WR9960305 en Volume 23, Número 3, Pags. 305-315 Restrito Wildlife Research
institution Instituto Nacional de Pesquisas da Amazônia - Repositório Institucional
collection INPA-RI
language English
topic Cane Toad
Introduced Amphibian
Mark Recapture
Australia, South America
Bufo Marinus
spellingShingle Cane Toad
Introduced Amphibian
Mark Recapture
Australia, South America
Bufo Marinus
Lampo, Margarita
Density estimates of cane toads from native populations based on mark-recapture data
topic_facet Cane Toad
Introduced Amphibian
Mark Recapture
Australia, South America
Bufo Marinus
description The cane toad (Bufo marinus) has received considerable attention because of its rapid spread in Australia and the potential threat it may represent to native species. Although the introduction of pathogens from native populations is now being considered to control this species, population estimates based on comparable methods that demonstrate that native populations are in fact less dense than the introduced ones are not available. Accurate population estimates are necessary to evaluate potential techniques for the control of the cane toad. We estimated population densities of cane toads over a wide range of habitat types and climate conditions by means of mark-recapture data. The capture history and location of toads each night were analysed to explore the validity of some of the assumptions of mark-recapture models. Because migrations, deaths and recruitment over three nights appear to be unimportant, populations may be legitimately regarded as closed for that period. However, cane toads seem highly sensitive to disturbance effects due to trapping and/or handling. Consequently, density estimates based on removal methods seem the most reliable because they are not sensitive to handling and trapping effects. Similarly, analyses of residuals of regressions between 1-night counts and density estimates suggested that toad nightly activity is affected by the air temperature during sampling. However, only 60% of the variation in estimated densities can be predicted by 1-night counts and air temperature. Estimates of population density over a wide range of habitats in South America were one order of magnitude lower than estimates in Australia. We speculate on the possible factors that may account for the lower densities in populations in the native range of the species.
format Artigo
author Lampo, Margarita
author2 Bayliss, Peter G.
author2Str Bayliss, Peter G.
title Density estimates of cane toads from native populations based on mark-recapture data
title_short Density estimates of cane toads from native populations based on mark-recapture data
title_full Density estimates of cane toads from native populations based on mark-recapture data
title_fullStr Density estimates of cane toads from native populations based on mark-recapture data
title_full_unstemmed Density estimates of cane toads from native populations based on mark-recapture data
title_sort density estimates of cane toads from native populations based on mark-recapture data
publisher Wildlife Research
publishDate 2020
url https://repositorio.inpa.gov.br/handle/1/19408
_version_ 1787142284163153920
score 11.755432

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