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Biodiversity management in dryland ecosystems Grant Norbury James Smith Andrea Byrom Roger Pech

Biodiversity management in dryland ecosystems Grant Norbury James Smith Andrea Byrom Roger Pech. Diverse, but threatened, indigenous biodiversity. Two major ecological issues. Complex food webs Successional vegetation. Exotic invaders. Short grass. Tall grass. Tall grass Shrub.

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Biodiversity management in dryland ecosystems Grant Norbury James Smith Andrea Byrom Roger Pech

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  1. Biodiversity management in dryland ecosystemsGrant NorburyJames SmithAndrea ByromRoger Pech

  2. Diverse, but threatened, indigenous biodiversity

  3. Two major ecological issues • Complex food webs • Successional vegetation

  4. Exotic invaders

  5. Short grass Tall grass Tall grass Shrub Shrub succession Shrub

  6. Conservation management in drylands • Predator control • Rabbit control • Weed control • Land retirement • Land development

  7. Herbivores Mesopredators • Predator control • Mesic Top predators Insectivores Invertebrates Lizards Pasture/seed/fruit

  8. Herbivores • Predator control • Dryland Top predators Insectivores Mesopredators Invertebrates Lizards Pasture/seed/fruit

  9. Rabbit control Top predators Insectivores Herbivores Mesopredators Invertebrates Lizards ? Pasture/seed/fruit

  10. Weed control Top predators Insectivores Herbivores Mesopredators Invertebrates Lizards Grass ? Pasture/seed/fruit

  11. Land retirement Top predators Insectivores Herbivores Mesopredators Invertebrates Lizards ? Pasture/seed/fruit

  12. Land use intensification Short grass Tall grass Tall grass Shrub Shrub

  13. Land use intensification

  14. 2003 1990 5 km

  15. 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

  16. Thankyou • Foundation for Research, Science & Technology • Department of Conservation

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