Estimation of biomass from body length and width for tropical rainforest canopy invertebrates

Wardhaugh, Carl W. (2013) Estimation of biomass from body length and width for tropical rainforest canopy invertebrates. Australian Journal of Entomology, 52 (4). pp. 291-298.

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Abstract

Accurate estimates of invertebrate biomass are essential for quantifying community structure, food web dynamics and energy flow in terrestrial ecosystems. In this paper, length-mass and length × width-mass regressions were carried out for 18 invertebrate taxonomic groups collected from the canopy of an Australian tropical rainforest. In an additional analysis, invertebrates were divided among seven body shape categories based on the ratio of body length to body width (from short and squat to long and thin) in an attempt to develop accurate equations for estimating biomass that can be applied to any taxonomic group in any locality. For most groups, the inclusion of body width to the predictor variable improved the model, confirming that body shape is an important factor in the accuracy of biomass estimations. The most accurate method for estimating invertebrate biomass was the use of taxon-specific equations, followed by equations based on body shape. Single whole-fauna equations were very inaccurate for estimating biomass, especially for insects that are either very squat or very long and thin. In accordance with previous studies, it was concluded that the most accurate method for estimating invertebrate biomass from proxy body measurements is the use of taxon-specific regression equations, especially those that incorporate body width in the model. However, equations based on body shape categories may be useful for estimating the biomass of groups for which no length-mass relationship has been determined, while single, whole-fauna equations should be avoided.

Item ID: 33346
Item Type: Article (Research - C1)
ISSN: 2052-1758
Keywords: Daintree Rainforest Observatory; length-weight regression; rainforest canopy; Wet Tropics
Funders: Marine and Tropical Sciences Research Facility (MTSRF), Skyrail Rainforest Foundation
Date Deposited: 25 May 2014 03:42
FoR Codes: 06 BIOLOGICAL SCIENCES > 0602 Ecology > 060203 Ecological Physiology @ 30%
06 BIOLOGICAL SCIENCES > 0608 Zoology > 060808 Invertebrate Biology @ 40%
06 BIOLOGICAL SCIENCES > 0602 Ecology > 060208 Terrestrial Ecology @ 30%
SEO Codes: 96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960806 Forest and Woodlands Flora, Fauna and Biodiversity @ 40%
97 EXPANDING KNOWLEDGE > 970105 Expanding Knowledge in the Environmental Sciences @ 30%
97 EXPANDING KNOWLEDGE > 970106 Expanding Knowledge in the Biological Sciences @ 30%
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