Growth and survival of two north Australian relictual tree species, Allosyncarpia ternata (Myrtaceae) and Callitris intratropica (Cupressaceae)

L Prior, David Bowman, B BROOK

    Research output: Contribution to journalArticleResearchpeer-review

    Abstract

    Allosyncarpia ternata (an angiosperm) and Callitris intratropica (a gymnosperm) are two fire-sensitive tree species of the Australian monsoonal tropics. Studies using historical aerial photography have revealed recent expansion of A. ternata rainforests. There has simultaneously been a widespread collapse of C. intratropica populations in northern Australian savannas, presumably because of cessation of traditional Aboriginal landscape burning. To explain the demography behind these contrasting trends, stand structure, survival, and growth of the two species were recorded over a 16-year period at the boundary of a rainforest patch and also in adjacent savanna, in Kakadu National Park. Ages of the largest trees of each species, estimated by using a Bayesian analysis of tree-diameter increments, were approximately 433 years for A. ternata and 235 years for C. intratropica on the rainforest boundary, and 417 years for C. intratropica in the adjacent savanna. Densities of juveniles (seedlings and re-sprouts <0.5 m high) were 325-6,000 times higher for A. ternata than for C. intratropica. Life-table calculations indicated there was sufficient recruitment of A. ternata, but not C. intratropica, to overcome observed mortality rates and maintain a stable population. This is almost certainly because A. ternata re-sprouts prolifically after fire whereas C. intratropica is an obligate seeder. These results highlight the critical need for careful fire management to maintain populations of a characteristic Australian gymnosperm over much of its range. � 2006 The Ecological Society of Japan.
    Original languageEnglish
    Pages (from-to)228-236
    Number of pages9
    JournalEcological Research
    Volume22
    Issue number2
    Publication statusPublished - 2007

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    Callitris
    Cupressaceae
    Myrtaceae
    rainforest
    savanna
    rain forests
    savannas
    gymnosperm
    aerial photography
    Bayesian analysis
    fire management
    life table
    population characteristics
    stand structure
    life tables
    Bayesian theory
    demography
    angiosperm
    tree and stand measurements
    Angiospermae

    Cite this

    @article{bdc2ade61f9242a7a97505cb1b0db538,
    title = "Growth and survival of two north Australian relictual tree species, Allosyncarpia ternata (Myrtaceae) and Callitris intratropica (Cupressaceae)",
    abstract = "Allosyncarpia ternata (an angiosperm) and Callitris intratropica (a gymnosperm) are two fire-sensitive tree species of the Australian monsoonal tropics. Studies using historical aerial photography have revealed recent expansion of A. ternata rainforests. There has simultaneously been a widespread collapse of C. intratropica populations in northern Australian savannas, presumably because of cessation of traditional Aboriginal landscape burning. To explain the demography behind these contrasting trends, stand structure, survival, and growth of the two species were recorded over a 16-year period at the boundary of a rainforest patch and also in adjacent savanna, in Kakadu National Park. Ages of the largest trees of each species, estimated by using a Bayesian analysis of tree-diameter increments, were approximately 433 years for A. ternata and 235 years for C. intratropica on the rainforest boundary, and 417 years for C. intratropica in the adjacent savanna. Densities of juveniles (seedlings and re-sprouts <0.5 m high) were 325-6,000 times higher for A. ternata than for C. intratropica. Life-table calculations indicated there was sufficient recruitment of A. ternata, but not C. intratropica, to overcome observed mortality rates and maintain a stable population. This is almost certainly because A. ternata re-sprouts prolifically after fire whereas C. intratropica is an obligate seeder. These results highlight the critical need for careful fire management to maintain populations of a characteristic Australian gymnosperm over much of its range. � 2006 The Ecological Society of Japan.",
    keywords = "aerial photography, burning, coniferous tree, dicotyledon, fire management, growth rate, life table, mortality, rainforest, recruitment, relict species, savanna, stand structure, survival, Australasia, Australia, Kakadu National Park, Northern Territory, Allosyncarpia ternata, Callitris intratropica, Cupressaceae, Gymnospermae, Magnoliophyta, Myrtaceae",
    author = "L Prior and David Bowman and B BROOK",
    year = "2007",
    language = "English",
    volume = "22",
    pages = "228--236",
    journal = "Ecological Research",
    issn = "0912-3814",
    publisher = "Global Science Books",
    number = "2",

    }

    Growth and survival of two north Australian relictual tree species, Allosyncarpia ternata (Myrtaceae) and Callitris intratropica (Cupressaceae). / Prior, L; Bowman, David; BROOK, B.

    In: Ecological Research, Vol. 22, No. 2, 2007, p. 228-236.

    Research output: Contribution to journalArticleResearchpeer-review

    TY - JOUR

    T1 - Growth and survival of two north Australian relictual tree species, Allosyncarpia ternata (Myrtaceae) and Callitris intratropica (Cupressaceae)

    AU - Prior, L

    AU - Bowman, David

    AU - BROOK, B

    PY - 2007

    Y1 - 2007

    N2 - Allosyncarpia ternata (an angiosperm) and Callitris intratropica (a gymnosperm) are two fire-sensitive tree species of the Australian monsoonal tropics. Studies using historical aerial photography have revealed recent expansion of A. ternata rainforests. There has simultaneously been a widespread collapse of C. intratropica populations in northern Australian savannas, presumably because of cessation of traditional Aboriginal landscape burning. To explain the demography behind these contrasting trends, stand structure, survival, and growth of the two species were recorded over a 16-year period at the boundary of a rainforest patch and also in adjacent savanna, in Kakadu National Park. Ages of the largest trees of each species, estimated by using a Bayesian analysis of tree-diameter increments, were approximately 433 years for A. ternata and 235 years for C. intratropica on the rainforest boundary, and 417 years for C. intratropica in the adjacent savanna. Densities of juveniles (seedlings and re-sprouts <0.5 m high) were 325-6,000 times higher for A. ternata than for C. intratropica. Life-table calculations indicated there was sufficient recruitment of A. ternata, but not C. intratropica, to overcome observed mortality rates and maintain a stable population. This is almost certainly because A. ternata re-sprouts prolifically after fire whereas C. intratropica is an obligate seeder. These results highlight the critical need for careful fire management to maintain populations of a characteristic Australian gymnosperm over much of its range. � 2006 The Ecological Society of Japan.

    AB - Allosyncarpia ternata (an angiosperm) and Callitris intratropica (a gymnosperm) are two fire-sensitive tree species of the Australian monsoonal tropics. Studies using historical aerial photography have revealed recent expansion of A. ternata rainforests. There has simultaneously been a widespread collapse of C. intratropica populations in northern Australian savannas, presumably because of cessation of traditional Aboriginal landscape burning. To explain the demography behind these contrasting trends, stand structure, survival, and growth of the two species were recorded over a 16-year period at the boundary of a rainforest patch and also in adjacent savanna, in Kakadu National Park. Ages of the largest trees of each species, estimated by using a Bayesian analysis of tree-diameter increments, were approximately 433 years for A. ternata and 235 years for C. intratropica on the rainforest boundary, and 417 years for C. intratropica in the adjacent savanna. Densities of juveniles (seedlings and re-sprouts <0.5 m high) were 325-6,000 times higher for A. ternata than for C. intratropica. Life-table calculations indicated there was sufficient recruitment of A. ternata, but not C. intratropica, to overcome observed mortality rates and maintain a stable population. This is almost certainly because A. ternata re-sprouts prolifically after fire whereas C. intratropica is an obligate seeder. These results highlight the critical need for careful fire management to maintain populations of a characteristic Australian gymnosperm over much of its range. � 2006 The Ecological Society of Japan.

    KW - aerial photography

    KW - burning

    KW - coniferous tree

    KW - dicotyledon

    KW - fire management

    KW - growth rate

    KW - life table

    KW - mortality

    KW - rainforest

    KW - recruitment

    KW - relict species

    KW - savanna

    KW - stand structure

    KW - survival

    KW - Australasia

    KW - Australia

    KW - Kakadu National Park

    KW - Northern Territory

    KW - Allosyncarpia ternata

    KW - Callitris intratropica

    KW - Cupressaceae

    KW - Gymnospermae

    KW - Magnoliophyta

    KW - Myrtaceae

    M3 - Article

    VL - 22

    SP - 228

    EP - 236

    JO - Ecological Research

    JF - Ecological Research

    SN - 0912-3814

    IS - 2

    ER -