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

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Presentation on theme: "Biodiversity management in dryland ecosystems Grant Norbury James Smith Andrea Byrom Roger Pech."— Presentation transcript:

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

2 Diverse, but threatened, indigenous biodiversity

3 Two major ecological issues 1.Complex food webs 2.Successional vegetation

4 Exoticinvaders

5

6 Shrub succession

7 Conservation management in drylands 1.Predator control 2.Rabbit control 3.Weed control 4.Land retirement Land development

8 Lizards Invertebrates Mesopredators Insectivores Herbivores Top predators Pasture/seed/fruit Predator control Mesic Predator control Mesic

9 Lizards Invertebrates Mesopredators Insectivores Herbivores Top predators Pasture/seed/fruit Predator control Dryland Predator control Dryland

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

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

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

13 Land use intensification

14

15 km

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17 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

18 Thankyou Foundation for Research, Science & Technology Department of Conservation


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