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Biodiversity management in dryland ecosystems Grant Norbury James Smith Andrea Byrom Roger Pech
Diverse, but threatened, indigenous biodiversity
Two major ecological issues 1.Complex food webs 2.Successional vegetation
Conservation management in drylands 1.Predator control 2.Rabbit control 3.Weed control 4.Land retirement Land development
Lizards Invertebrates Mesopredators Insectivores Herbivores Top predators Pasture/seed/fruit Predator control Mesic Predator control Mesic
Lizards Invertebrates Mesopredators Insectivores Herbivores Top predators Pasture/seed/fruit Predator control Dryland Predator control Dryland
Lizards Invertebrates Mesopredators Insectivores Herbivores Top predators Pasture/seed/fruit Rabbit control ?
Lizards Invertebrates Mesopredators Insectivores Herbivores Top predators Pasture/seed/fruit Weed control Grass ?
Lizards Invertebrates Mesopredators Insectivores Herbivores Top predators Pasture/seed/fruit Land retirement ?
Land use intensification
19902003 5 km
Conclusions Ecosystem complexity leads to uncertain outcomes Changes in land use can have profound effects on food webs, and therefore on biodiversity Scale of management is critical
Thankyou Foundation for Research, Science & Technology Department of Conservation
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