Relative Abundance Differences of Two Invasive Toad Species on Minami-daito and Kita-daito Islands, Japan

Detalhes bibliográficos
Autor(a) principal: Komine, Hirotaka
Data de Publicação: 2020
Outros Autores: Trentin, Bruna Elisa [UNESP], Koike, Shinsuke
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://dx.doi.org/10.5358/hsj.39.38
http://hdl.handle.net/11449/195239
Resumo: Biological invasions are major threats to global biodiversity, and island ecosystems are especially vulnerable. Many previous studies have reported the presence of invasive species on islands, but relatively few studies have quantified the population status of such species. Furthermore, multiple invasive species are often introduced to the same region or island. In such case, quantifying the relative abundance of each species would provide us with significant insight into their population dynamics and potential species interactions. Rhinella marina and Bufo gargarizans miyakonis were introduced to both Minami-daito and Kita-daito Islands before 1945. Although some studies have reported their invasion and establishment, few studies have quantified their relative abundance. To reveal their relative abundance, we set 5 km line transects and counted the number of each species from 11 to 31 July 2019. We applied generalized linear models to examine the relationship between the number of individuals observed with species and environmental factors. We also applied these models to examine the relationship between the number of individuals observed with island and environmental factors. We found the relative abundance of R. marina was significantly higher than that of B. g. miyakonis on Minami-daito Island. This is the opposite pattern of 30 years ago, suggesting the population dynamics of these invasive toads is unstable on Minami-daito Island. Although B. g. miyakonis was found on both islands, no individual of R. marina was found on Kita-daito Island. The population dynamics may depend on environmental differences between islands and ecological differences between species. Future studies are needed to reveal the potential factors determining the differences in relative abundance between islands and between species.
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spelling Relative Abundance Differences of Two Invasive Toad Species on Minami-daito and Kita-daito Islands, JapanBufo gargarizans miyakonisDaito IslandsInvasive speciesRelative abundanceRhinella marinaToadBiological invasions are major threats to global biodiversity, and island ecosystems are especially vulnerable. Many previous studies have reported the presence of invasive species on islands, but relatively few studies have quantified the population status of such species. Furthermore, multiple invasive species are often introduced to the same region or island. In such case, quantifying the relative abundance of each species would provide us with significant insight into their population dynamics and potential species interactions. Rhinella marina and Bufo gargarizans miyakonis were introduced to both Minami-daito and Kita-daito Islands before 1945. Although some studies have reported their invasion and establishment, few studies have quantified their relative abundance. To reveal their relative abundance, we set 5 km line transects and counted the number of each species from 11 to 31 July 2019. We applied generalized linear models to examine the relationship between the number of individuals observed with species and environmental factors. We also applied these models to examine the relationship between the number of individuals observed with island and environmental factors. We found the relative abundance of R. marina was significantly higher than that of B. g. miyakonis on Minami-daito Island. This is the opposite pattern of 30 years ago, suggesting the population dynamics of these invasive toads is unstable on Minami-daito Island. Although B. g. miyakonis was found on both islands, no individual of R. marina was found on Kita-daito Island. The population dynamics may depend on environmental differences between islands and ecological differences between species. Future studies are needed to reveal the potential factors determining the differences in relative abundance between islands and between species.Fujiwara Natural History FoundationTokyo Univ Agr & Technol, Inst Global Innovat Res, 3-5-8 Saiwai Cho, Fuchu, Tokyo 1838509, JapanUNESP Sao Paulo State Univ, Dept Ecol, BR-18610034 Botucatu, SP, BrazilTokyo Univ Agr & Technol, Inst Agr, 3-5-8 Saiwai Cho, Fuchu, Tokyo 1838509, JapanUNESP Sao Paulo State Univ, Dept Ecol, BR-18610034 Botucatu, SP, BrazilHerpetological Soc Japan, Kyoto Univ, Graduate Sch ScieTokyo Univ Agr & TechnolUniversidade Estadual Paulista (Unesp)Komine, HirotakaTrentin, Bruna Elisa [UNESP]Koike, Shinsuke2020-12-10T17:28:00Z2020-12-10T17:28:00Z2020-02-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article38-46http://dx.doi.org/10.5358/hsj.39.38Current Herpetology. Kyoto: Herpetological Soc Japan, Kyoto Univ, Graduate Sch Scie, v. 39, n. 1, p. 38-46, 2020.1345-5834http://hdl.handle.net/11449/19523910.5358/hsj.39.38WOS:000518799500005Web of Sciencereponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengCurrent Herpetologyinfo:eu-repo/semantics/openAccess2021-10-23T07:00:39Zoai:repositorio.unesp.br:11449/195239Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T17:37:00.136551Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv Relative Abundance Differences of Two Invasive Toad Species on Minami-daito and Kita-daito Islands, Japan
title Relative Abundance Differences of Two Invasive Toad Species on Minami-daito and Kita-daito Islands, Japan
spellingShingle Relative Abundance Differences of Two Invasive Toad Species on Minami-daito and Kita-daito Islands, Japan
Komine, Hirotaka
Bufo gargarizans miyakonis
Daito Islands
Invasive species
Relative abundance
Rhinella marina
Toad
title_short Relative Abundance Differences of Two Invasive Toad Species on Minami-daito and Kita-daito Islands, Japan
title_full Relative Abundance Differences of Two Invasive Toad Species on Minami-daito and Kita-daito Islands, Japan
title_fullStr Relative Abundance Differences of Two Invasive Toad Species on Minami-daito and Kita-daito Islands, Japan
title_full_unstemmed Relative Abundance Differences of Two Invasive Toad Species on Minami-daito and Kita-daito Islands, Japan
title_sort Relative Abundance Differences of Two Invasive Toad Species on Minami-daito and Kita-daito Islands, Japan
author Komine, Hirotaka
author_facet Komine, Hirotaka
Trentin, Bruna Elisa [UNESP]
Koike, Shinsuke
author_role author
author2 Trentin, Bruna Elisa [UNESP]
Koike, Shinsuke
author2_role author
author
dc.contributor.none.fl_str_mv Tokyo Univ Agr & Technol
Universidade Estadual Paulista (Unesp)
dc.contributor.author.fl_str_mv Komine, Hirotaka
Trentin, Bruna Elisa [UNESP]
Koike, Shinsuke
dc.subject.por.fl_str_mv Bufo gargarizans miyakonis
Daito Islands
Invasive species
Relative abundance
Rhinella marina
Toad
topic Bufo gargarizans miyakonis
Daito Islands
Invasive species
Relative abundance
Rhinella marina
Toad
description Biological invasions are major threats to global biodiversity, and island ecosystems are especially vulnerable. Many previous studies have reported the presence of invasive species on islands, but relatively few studies have quantified the population status of such species. Furthermore, multiple invasive species are often introduced to the same region or island. In such case, quantifying the relative abundance of each species would provide us with significant insight into their population dynamics and potential species interactions. Rhinella marina and Bufo gargarizans miyakonis were introduced to both Minami-daito and Kita-daito Islands before 1945. Although some studies have reported their invasion and establishment, few studies have quantified their relative abundance. To reveal their relative abundance, we set 5 km line transects and counted the number of each species from 11 to 31 July 2019. We applied generalized linear models to examine the relationship between the number of individuals observed with species and environmental factors. We also applied these models to examine the relationship between the number of individuals observed with island and environmental factors. We found the relative abundance of R. marina was significantly higher than that of B. g. miyakonis on Minami-daito Island. This is the opposite pattern of 30 years ago, suggesting the population dynamics of these invasive toads is unstable on Minami-daito Island. Although B. g. miyakonis was found on both islands, no individual of R. marina was found on Kita-daito Island. The population dynamics may depend on environmental differences between islands and ecological differences between species. Future studies are needed to reveal the potential factors determining the differences in relative abundance between islands and between species.
publishDate 2020
dc.date.none.fl_str_mv 2020-12-10T17:28:00Z
2020-12-10T17:28:00Z
2020-02-01
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://dx.doi.org/10.5358/hsj.39.38
Current Herpetology. Kyoto: Herpetological Soc Japan, Kyoto Univ, Graduate Sch Scie, v. 39, n. 1, p. 38-46, 2020.
1345-5834
http://hdl.handle.net/11449/195239
10.5358/hsj.39.38
WOS:000518799500005
url http://dx.doi.org/10.5358/hsj.39.38
http://hdl.handle.net/11449/195239
identifier_str_mv Current Herpetology. Kyoto: Herpetological Soc Japan, Kyoto Univ, Graduate Sch Scie, v. 39, n. 1, p. 38-46, 2020.
1345-5834
10.5358/hsj.39.38
WOS:000518799500005
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Current Herpetology
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 38-46
dc.publisher.none.fl_str_mv Herpetological Soc Japan, Kyoto Univ, Graduate Sch Scie
publisher.none.fl_str_mv Herpetological Soc Japan, Kyoto Univ, Graduate Sch Scie
dc.source.none.fl_str_mv Web of Science
reponame:Repositório Institucional da UNESP
instname:Universidade Estadual Paulista (UNESP)
instacron:UNESP
instname_str Universidade Estadual Paulista (UNESP)
instacron_str UNESP
institution UNESP
reponame_str Repositório Institucional da UNESP
collection Repositório Institucional da UNESP
repository.name.fl_str_mv Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)
repository.mail.fl_str_mv
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