Demographics and population persistence of Gehyra variegata (Gekkonidae) following habitat fragmentation

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    Abstract

    Predicting the effects of habitat fragmentation on the demographic characteristics and habitat use of a species is critical for managing that species in fragmented habitat. In contrast to other geckos, Gehyra variegata exhibits a high level of occupancy in remnant habitat in the Western Australian wheatbelt. In this study, I compare the population characteristics of G. variegata in 12 smooth-barked Eucalyptus woodland remnants with those in similar woodland communities in three nature reserves. Population sizes in the remnants ranged from 11 to 545 and were highly correlated with remnant size while sex ratios and age structure were reasonably consistent among remnant and nature reserve populations. These data suggest that populations are most affected by habitat or characteristics associated with habitat such as food and shelter availability and are inconsistent with stochastic effects associated with small population size. Habitat use varied markedly between remnant and nature reserve populations, with the lizards largely confined to logs or eucalypts in habitat remnants but using shrubs in the nature reserves with high frequency. This indicates that habitat change has caused G. variegata to alter its habitat usage and emphasizes the value of being able to occupy a wide variety of habitats. Comparison of the demographic characteristics of G. variegata populations with those of other species of geckos suggest that the generalist habitat requirements, stable population structure, and long life expectancy in adulthood (all typical of G. variegata) are important contributors to its ability to persist in remnant habitat.
    Original languageEnglish
    Pages (from-to)153-162
    JournalJournal of Herpetology
    Volume32
    Issue number2
    Publication statusPublished - 1998

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    Gekkonidae
    habitat fragmentation
    demographic statistics
    persistence
    habitat
    habitats
    nature reserve
    conservation areas
    sociodemographic characteristics
    habitat use
    population size
    woodland
    woodlands
    population characteristics
    life expectancy
    lizard
    generalist
    shelter
    age structure
    sex ratio

    Cite this

    @article{ddeeafaa990c44e49581769581157100,
    title = "Demographics and population persistence of Gehyra variegata (Gekkonidae) following habitat fragmentation",
    abstract = "Predicting the effects of habitat fragmentation on the demographic characteristics and habitat use of a species is critical for managing that species in fragmented habitat. In contrast to other geckos, Gehyra variegata exhibits a high level of occupancy in remnant habitat in the Western Australian wheatbelt. In this study, I compare the population characteristics of G. variegata in 12 smooth-barked Eucalyptus woodland remnants with those in similar woodland communities in three nature reserves. Population sizes in the remnants ranged from 11 to 545 and were highly correlated with remnant size while sex ratios and age structure were reasonably consistent among remnant and nature reserve populations. These data suggest that populations are most affected by habitat or characteristics associated with habitat such as food and shelter availability and are inconsistent with stochastic effects associated with small population size. Habitat use varied markedly between remnant and nature reserve populations, with the lizards largely confined to logs or eucalypts in habitat remnants but using shrubs in the nature reserves with high frequency. This indicates that habitat change has caused G. variegata to alter its habitat usage and emphasizes the value of being able to occupy a wide variety of habitats. Comparison of the demographic characteristics of G. variegata populations with those of other species of geckos suggest that the generalist habitat requirements, stable population structure, and long life expectancy in adulthood (all typical of G. variegata) are important contributors to its ability to persist in remnant habitat.",
    author = "Stephen SARRE",
    year = "1998",
    language = "English",
    volume = "32",
    pages = "153--162",
    journal = "Journal of Herpetology",
    issn = "0022-1511",
    publisher = "Society for the Study of Amphibians and Reptiles",
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    }

    Demographics and population persistence of Gehyra variegata (Gekkonidae) following habitat fragmentation. / SARRE, Stephen.

    In: Journal of Herpetology, Vol. 32, No. 2, 1998, p. 153-162.

    Research output: Contribution to journalArticle

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    AB - Predicting the effects of habitat fragmentation on the demographic characteristics and habitat use of a species is critical for managing that species in fragmented habitat. In contrast to other geckos, Gehyra variegata exhibits a high level of occupancy in remnant habitat in the Western Australian wheatbelt. In this study, I compare the population characteristics of G. variegata in 12 smooth-barked Eucalyptus woodland remnants with those in similar woodland communities in three nature reserves. Population sizes in the remnants ranged from 11 to 545 and were highly correlated with remnant size while sex ratios and age structure were reasonably consistent among remnant and nature reserve populations. These data suggest that populations are most affected by habitat or characteristics associated with habitat such as food and shelter availability and are inconsistent with stochastic effects associated with small population size. Habitat use varied markedly between remnant and nature reserve populations, with the lizards largely confined to logs or eucalypts in habitat remnants but using shrubs in the nature reserves with high frequency. This indicates that habitat change has caused G. variegata to alter its habitat usage and emphasizes the value of being able to occupy a wide variety of habitats. Comparison of the demographic characteristics of G. variegata populations with those of other species of geckos suggest that the generalist habitat requirements, stable population structure, and long life expectancy in adulthood (all typical of G. variegata) are important contributors to its ability to persist in remnant habitat.

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