An assessment of some improved techniques for estimating the abundance (frequency) of sedentary organisms

Article

Morrison, David A., Le Brocque, Andrew F. and Clarke, Peter J.. 1995. "An assessment of some improved techniques for estimating the abundance (frequency) of sedentary organisms." Vegetatio. 120 (2), pp. 131-145. https://doi.org/10.1007/BF00034343
Article Title

An assessment of some improved techniques for estimating the abundance (frequency) of sedentary organisms

ERA Journal ID3307
Article CategoryArticle
AuthorsMorrison, David A. (Author), Le Brocque, Andrew F. (Author) and Clarke, Peter J. (Author)
Journal TitleVegetatio
Plant Ecology
Journal Citation120 (2), pp. 131-145
Number of Pages15
Year1995
PublisherSpringer
Place of PublicationDordrecht, Netherlands
ISSN0042-3106
1385-0237
1573-5052
Digital Object Identifier (DOI)https://doi.org/10.1007/BF00034343
Abstract

The traditional sampling method for estimating frequency (the number of sub-quadrats containing a basal part of the
organisms) is compared, using both computer simulations and direct comparison in the field, to two new methods that use a compound series of variable-sized concentric sub-quadrats. Both the new frequency-score and the new
importance-score methods are closer approximations of density than is the standard frequency method, and the
estimates produced by both of the new methods are less affected by the choice of sub-quadrat size and the spatial
distribution (dispersion) of the organisms (i.e. clumping and regularity). Thus, the two nested-quadrat methods
appear to ameliorate the usual frequency limitations associated with sub-quadrat size and organism dispersion, by
the use of a range of different sub-quadrat sizes. This is important in community studies, where the component
species may show a wide range of densities and dispersions. Both of the new methods are easily employed in the
field. The importance-score method involves no more sampling effort than does standard qualitative (presenceabsence)sampling, and it can therefore be used to sample a larger quadrat area than would normally be used for frequency sampling. This makes the method much more cost-effective as a means of estimating abundance, and it allows a greater number of the rarer species to be included in the sampling. The frequency-score method is more time-consuming, but it is capable of detecting more subtle community patterns. This means that it is particularly useful for the study of species-poor communities or where small variations in composition need to be detected.

Keywordsabundance; frequency; frequency-score; importance-score; presence-absence; sampling
ANZSRC Field of Research 2020310308. Terrestrial ecology
410203. Ecosystem function
310302. Community ecology (excl. invasive species ecology)
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Le Brocque, Andrew F. and Cockfield, Geoff. 2008. Vegetation changes following the exclusion of grazing in the Traprock region. Toowoomba, Australia. University of Southern Queensland, Australian Centre for Sustainable Catchments / Traprock Wool Association Inc..
Technical report: vegetation changes following the short-term exclusion of grazing in the Traprock region
Goodhew, Kellie A. and Le Brocque, Andrew F.. 2006. Technical report: vegetation changes following the short-term exclusion of grazing in the Traprock region. Toowoomba, Australia. University of Southern Queensland.
Vegetation management, grazing and arthropod assemblages in the Traprock region: interim report
Attwood, Simon J., Le Brocque, Andrew F., Cockfield, Geoff and Schumacher, Roslyn. 2005. Vegetation management, grazing and arthropod assemblages in the Traprock region: interim report. Toowoomba, Australia. University of Southern Queensland.
Technical report: effect of vegetation management on woodland communities in the Traprock region
Le Brocque, Andrew F., Goodhew, Kellie A. and Cockfield, Geoff. 2005. Technical report: effect of vegetation management on woodland communities in the Traprock region. Toowoomba, Australia. University of Southern Queensland.
Endophytic fungi associated with Australian orchids
Dearnaley, John and Le Brocque, Andrew F.. 2006. "Endophytic fungi associated with Australian orchids." Australasian Plant Conservation: Bulletin of the Australian Network for Plant Conservation. 15 (2), pp. 7-9.
Trees in a grazing landscape: vegetation patterns in sheep-grazing agro-ecosystems in Southern Queensland
Le Brocque, Andrew F., Cockfield, Geoff and Goodhew, Kellie A.. 2006. "Trees in a grazing landscape: vegetation patterns in sheep-grazing agro-ecosystems in Southern Queensland." Timmins, Susan (ed.) 3rd Joint Conference of the New Zealand Ecological Society and the Ecological Society of Australia. Wellington, New Zealand 28 Aug - 01 Sep 2006 Wellington, New Zealand.
Vegetation community responses to altered flow regimes and weed invasion in reparian woodlands of the upper condamine floodplain, Eastern Australia
Reardon-Smith, Kathryn, Le Brocque, Andrew F., House, Alan and Zammit, Charlie. 2005. "Vegetation community responses to altered flow regimes and weed invasion in reparian woodlands of the upper condamine floodplain, Eastern Australia." Miller, Craig (ed.) 2005 Conference of the Ecological Society of Australia (ESA 2005). Brisbane, Australia 28 Nov - 02 Dec 2005 Brisbane, Queensland, Australia. Ecological Society of Australia.
Vegetation management and woodland communities in the traprock sheep grazing region of Southern Queensland
Goodhew, Kellie A., Le Brocque, Andrew F. and Zammit, Charlie. 2005. "Vegetation management and woodland communities in the traprock sheep grazing region of Southern Queensland." Miller, Craig (ed.) 2005 Conference of the Ecological Society of Australia (ESA 2005). Brisbane, Australia 28 Nov - 02 Dec 2005 Brisbane, Queensland.
Ecosystem functioning across vegetation - production boundaries in brigalow (Acacia Harpophylla) in Southern Queensland
Collard, Stuart, Zammit, Charlie and Le Brocque, Andrew F.. 2005. "Ecosystem functioning across vegetation - production boundaries in brigalow (Acacia Harpophylla) in Southern Queensland." Miller, Craig (ed.) 2005 Conference of the Ecological Society of Australia (ESA 2005). Brisbane, Australia 28 Nov - 02 Dec 2005 Brisbane, Queensland.