Generalised regressions provide good estimates of insect and spider biomass in the monsoonal tropics of Australia

C BRADY, Richard Noske

    Research output: Contribution to journalArticleResearchpeer-review

    Abstract

    The estimation of arthropod biomass is often important in studies of terrestrial ecosystem structure and function, including analyses of the relative importance of different arthropod taxa in the diet of insectivorous animals. In order to estimate arthropod biomass in eucalypt woodlands and rehabilitated mine-land in the monsoonal tropics of northern Australia, insect morpho-species (n = 693) and spider morpho-species (n = 100) were collected, sorted, then weighed and measured. Body length-weight regressions were determined for spiders, nine insect orders and all insects combined. There was a significant relationship between body length and weight for all taxonomic groups, with the power model being a better predictor than linear or exponential models for all groups except Diptera (which was best predicted by the linear model). Whilst Schoener (1980) found that the length-weight regression slopes of neotropical insects (all orders combined, as well as several individual orders) differed from those of their temperate North American counterparts, our comparisons between monsoon-tropical and temperate Australian arthropods suggested differences among Dipterans and spiders only. We conclude that generalised regressions provide adequate estimates of arthropod biomass across Australia, providing that the body proportions of the dominant taxa do not vary substantively. � 2006 The Authors.
    Original languageEnglish
    Pages (from-to)187-191
    Number of pages5
    JournalAustral Entomology
    Volume45
    Issue number3
    Publication statusPublished - 2006

    Fingerprint

    spider
    arthropod
    Araneae
    arthropods
    tropics
    insect
    insects
    biomass
    body length
    ecosystem structure
    ecosystem function
    terrestrial ecosystem
    woodlands
    woodland
    monsoon
    linear models
    diet
    body weight
    animal
    animals

    Cite this

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    title = "Generalised regressions provide good estimates of insect and spider biomass in the monsoonal tropics of Australia",
    abstract = "The estimation of arthropod biomass is often important in studies of terrestrial ecosystem structure and function, including analyses of the relative importance of different arthropod taxa in the diet of insectivorous animals. In order to estimate arthropod biomass in eucalypt woodlands and rehabilitated mine-land in the monsoonal tropics of northern Australia, insect morpho-species (n = 693) and spider morpho-species (n = 100) were collected, sorted, then weighed and measured. Body length-weight regressions were determined for spiders, nine insect orders and all insects combined. There was a significant relationship between body length and weight for all taxonomic groups, with the power model being a better predictor than linear or exponential models for all groups except Diptera (which was best predicted by the linear model). Whilst Schoener (1980) found that the length-weight regression slopes of neotropical insects (all orders combined, as well as several individual orders) differed from those of their temperate North American counterparts, our comparisons between monsoon-tropical and temperate Australian arthropods suggested differences among Dipterans and spiders only. We conclude that generalised regressions provide adequate estimates of arthropod biomass across Australia, providing that the body proportions of the dominant taxa do not vary substantively. � 2006 The Authors.",
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    author = "C BRADY and Richard Noske",
    year = "2006",
    language = "English",
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    pages = "187--191",
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    Generalised regressions provide good estimates of insect and spider biomass in the monsoonal tropics of Australia. / BRADY, C; Noske, Richard.

    In: Austral Entomology, Vol. 45, No. 3, 2006, p. 187-191.

    Research output: Contribution to journalArticleResearchpeer-review

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    AU - BRADY, C

    AU - Noske, Richard

    PY - 2006

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    AB - The estimation of arthropod biomass is often important in studies of terrestrial ecosystem structure and function, including analyses of the relative importance of different arthropod taxa in the diet of insectivorous animals. In order to estimate arthropod biomass in eucalypt woodlands and rehabilitated mine-land in the monsoonal tropics of northern Australia, insect morpho-species (n = 693) and spider morpho-species (n = 100) were collected, sorted, then weighed and measured. Body length-weight regressions were determined for spiders, nine insect orders and all insects combined. There was a significant relationship between body length and weight for all taxonomic groups, with the power model being a better predictor than linear or exponential models for all groups except Diptera (which was best predicted by the linear model). Whilst Schoener (1980) found that the length-weight regression slopes of neotropical insects (all orders combined, as well as several individual orders) differed from those of their temperate North American counterparts, our comparisons between monsoon-tropical and temperate Australian arthropods suggested differences among Dipterans and spiders only. We conclude that generalised regressions provide adequate estimates of arthropod biomass across Australia, providing that the body proportions of the dominant taxa do not vary substantively. � 2006 The Authors.

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