Influence of woody vegetation on pollinator densities in oilseed Brassica fields in an Australian temperate landscape |
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| Authors: | Anthony D. Arthur Jin Li Steve Henry Saul A. Cunningham |
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| Affiliation: | 1. CSIRO Sustainable Ecosystems, GPO Box 284, Canberra, ACT 2601, Australia;2. Geoscience Australia, GPO Box 378, Canberra, ACT 2601, Australia;3. CSIRO Entomology, GPO Box 1700, Canberra, ACT 2601, Australia;1. Centre for Environmental and Climate Research, Lund University, Ecology Building, SE-223 62 Lund, Sweden;2. Department of Biology, Lund University, Ecology Building, SE-223 62 Lund, Sweden;1. The Waite Research Institue and The School of Agriculture, Food and Wine, University of Adelaide, Waite Campus, PMB1 Glen Osmond, SA, 5064, Australia;2. Centre for Integrative Ecology, School of Life and Environmental Sciences, Deakin University, Burwood, VIC 3125, Australia;3. Institute for Applied Ecology, University of Canberra, Bruce, ACT 2617, Australia;4. School of Biological Sciences, Monash University, Clayton, VIC 3800, Australia;1. School of Agricultural and Wine Sciences, Faculty of Science, Charles Sturt University, P.O. Box 883, Orange, NSW 2800, Australia;2. Graham Centre, Charles Sturt University, P.O. Box 883, Orange, NSW, 2800, Australia;3. State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, Fujian Agriculture and Forestry University, Fuzhou, 350002, China;4. Institute of Applied Ecology and Research Centre for Biodiversity and Eco-Safety, Fujian Agriculture and Forestry University, Fuzhou, 350002, China;5. Fujian-Taiwan Joint Innovation Centre for Ecological Control of Crop Pests, Fujian Agriculture and Forestry University, Fuzhou, 350002, China;1. CSIRO Ecosystem Sciences, Waite Campus, Urrbrae, SA 5064, Australia;2. CSIRO Ecosystem Sciences, Black Mountain, Canberra, ACT 2601, Australia;3. CSIRO Ecosystem Sciences, Dutton Park, QLD 4102, Australia;4. CSIRO Marine and Atmospheric Research, Black Mountain, Canberra, ACT 2601, Australia;5. CSIRO Land and Water, Black Mountain, Canberra, ACT 2601, Australia;6. CSIRO Land and Water, Dutton Park, QLD 4102, Australia;7. School of Biological Sciences, The University of Queensland, St. Lucia, QLD 4072, Australia |
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| Abstract: | Wild pollinators may benefit Brassica oilseed production in temperate Australia, yet it is not known how the density of potential pollinators varies in these landscapes. In this study we assessed whether the density of feral honeybees, hoverflies (probably 2 species) and native bees (multiple species) in temperate Australian Brassica oilseed crops was related to the composition of the landscape. The density of pollinators was measured at multiple points in six different Brassica oilseed paddocks (20–80 ha) at least 1.75 km apart. Landscape composition at multiple scales (radii 100–2000 m) was determined from GIS layers of Brassica paddocks, woody vegetation and non-woody vegetation, and a derived layer expected to reflect the condition of woody vegetation remnants (the ‘Link’ score). Densities of feral honeybees were higher near the edges of Brassica fields than towards the middle. Densities of feral honeybees were strongly positively associated with the summed ‘Link’ score within 300 m and with the amount of woody vegetation. Densities of native bees and hoverflies were not strongly associated with woody vegetation or with woody vegetation with a high ‘Link’ score. Our results suggest that maximising feral honeybee abundance within paddocks in these landscapes may require smaller paddocks than those typically used, interspersed with habitat beneficial to feral honeybees such as woody vegetation in good condition. |
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