Non-linear effects of landscape properties on mistletoe parasitism in fragmented agricultural landscapes

MacRaild, Lindy M., Radford, James Q. and Bennett, Andrew F. 2010, Non-linear effects of landscape properties on mistletoe parasitism in fragmented agricultural landscapes, Landscape ecology, vol. 25, pp. 395-406.

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Title Non-linear effects of landscape properties on mistletoe parasitism in fragmented agricultural landscapes
Author(s) MacRaild, Lindy M.
Radford, James Q.
Bennett, Andrew F.
Journal name Landscape ecology
Volume number 25
Start page 395
End page 406
Total pages 12
Publisher Springer Netherlands
Place of publication Netherlands
Publication date 2010
ISSN 0921-2973
1572-9761
Keyword(s) Land mosaic
Landscape structure
Amyema miquelii
Threshold
Farmland
Australia
Summary Ecological processes such as plant–animal interactions have a critical role in shaping the structure and function of ecosystems, but little is known of how such processes are modified by changes in landscape structure. We investigated the effect of landscape change on mistletoe parasitism in fragmented agricultural environments by surveying mistletoes on eucalypt host trees in 24 landscapes, each 100 km2 in size, in south-eastern Australia. Landscapes were selected to represent a gradient in extent (from 60% to 2% cover) and spatial pattern of remnant wooded vegetation. Mistletoes were surveyed at 15 sites in each landscape, stratified to sample five types of wooded elements in proportion to their relative cover. The incidence per landscape of box mistletoe (Amyema miquelii), the most common species, was best explained by the extent of wooded cover (non-linear relationship) and mean annual rainfall. Higher incidence occurred in landscapes with intermediate levels of cover (15–30%) and higher rainfall (>500 mm). Importantly, a marked non-linear decline in the incidence of A. miquelii in low-cover landscapes implies a disproportionate loss of this species in remaining wooded vegetation, greater than that attributable to decreasing forest cover. The most likely mechanism is the effect of landscape change on the mistletoebird (Dicaeum hirundinaceum), the primary seed-dispersal vector for A. miquelii. Our results are consistent with observations that habitat fragmentation initially enhances mistletoe occurrence in agricultural environments; but in this region, when wooded vegetation fell below a threshold of ~15% landscape cover, the incidence of A. miquelii declined precipitously. Conservation management will benefit from greater understanding of the components of landscape structure that most influence ecological processes, such as mistletoe parasitism and other plant–animal mutualisms, and the critical stages in such relationships. This will facilitate action before critical thresholds are crossed and cascading effects extend to other aspects of ecosystem function.
Language eng
Field of Research 050104 Landscape Ecology
Socio Economic Objective 960505 Ecosystem Assessment and Management of Forest and Woodlands Environments
HERDC Research category C1 Refereed article in a scholarly journal
HERDC collection year 2010
Copyright notice ©2009, Springer Science
Persistent URL http://hdl.handle.net/10536/DRO/DU:30029403

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