Relationships between site characteristics, farming system and biodiversity on Australian mixed farms.
Bridle, K and Fitzgerald, M and Green, D and Smith, J and McQuillan, PB and Lefroy, T (2009) Relationships between site characteristics, farming system and biodiversity on Australian mixed farms. Animal Production Science, 49 . pp. 869-882. ISSN 1836-0939
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Official URL: http://dx.doi.org/10.1071/AN09042
A collaborative project between researchers, regional natural resource management organisations and
landholders set out to explore three questions about the relationships between biodiversity and land use in Australia’s
mixed-farming landscapes: (1) the extent to which farm-scale measures of biodiversity were related to agricultural
production; (2) the influence of the type and intensity of agricultural production on native biodiversity on farms; and
(3) the relative influence of site and farming system on selected measures of biodiversity. Four land-use types on 47 mixed
farms across nine regions, derived from several of Australia’s 56 natural resource management regions, were surveyed in
autumn and spring 2006 and 2007. Surveys of birds, surface invertebrates (beetles, ants, spiders), vegetation and soils were
undertaken on four land classes on each farm; crop, ‘rotation’ (break crop/pasture phase), perennial pasture and remnant
vegetation. Data were collected by participating regional staff, using a standard protocol, which were sent to a central
collection point for collation, analysis and interpretation.
Species richness, functional diversity and vegetation structure were assessed. This introductory paper focuses on
results relating to species richness, which for most taxa was greater in remnant vegetation than other land-use classes and
declined along a disturbance gradient (remnant, pasture, rotation, crop). Properties with a greater proportion of perennial
pastures recorded higher species richness than properties that were dominated by crop. Properties that recorded high
wheat yields (t/ha) also recorded lower species richness for spiders and birds. The presence of insectivorous birds and
beneficial invertebrates (spiders, beetles and ants) in all land-use classes suggests the potential to apply integrated pest
management approaches to mixed-farming systems across the country.
Site and system features were found to be important determinants of biodiversity, with their relative importance varying
with the scale of investigation and the taxa. At the landscape scale, bird species richness was correlated with the amount of
remnant vegetation within a 5-km radius of the farm boundary, and with the condition of native vegetation on the farm. The
average size of remnant vegetation patches was 5 ha or less on nearly half of the properties surveyed. At the farm scale, ant
species richness was correlated with site features, while beetles were correlated with management/system features such as the
presence and fertility of perennial pastures.
Analyses at the functional group level will provide more detailed information on relationships between different land-use
types. Further experimental work needs to be undertaken to qualify the suggested impact of land management practices
on different taxa, while repeated surveys will allow for the collation of datasets over time, from which population dynamics
may be determined.
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|Deposited By:||Miss AM Young|
|Deposited On:||23 Jun 2010 16:52|
|Last Modified:||23 Jun 2010 16:52|
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