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IMI

IMI. Invasive mammal impacts on biodiversity. History. ►. ►. ►. IMI research: 4 ‘strands’. Wendy Ruscoe. 1. Forests. 2. Drylands. Andrea Byrom. Pen Holland. Grant Norbury. Mandy Barron. Graeme Elliott. 3. Global change. 4. Theory. Dryland food web. Top-level predators.

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IMI

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  1. IMI Invasive mammal impacts on biodiversity

  2. History ► ► ►

  3. IMI research: 4 ‘strands’ Wendy Ruscoe 1. Forests 2. Drylands Andrea Byrom Pen Holland Grant Norbury Mandy Barron Graeme Elliott 3. Global change 4. Theory

  4. Dryland food web Top-level predators Ferret Cat Stoat Herbivores Mesopredators Insectivore Rabbit Rat Hedgehog Impacts Possum Hare Mouse Native lizards Native invertebrates Pasture/Seed/Fruit Climate

  5. Using models to drive research ... 36 38 40 37 Cats Ferrets Stoats & Weasels 41 39 42 34 20 33 35 26 25 27 19 15 14 30 24 Rabbits Possums Mice Lizards Hedgehog RHD? 31 28 22 21 18 32 29 23 13 16 17 8 Pasture seed Shrub seed Tussock seed Invertebrates 11 4 6 9 5 7 10 12 Dan Roger Andrea Grant James 3 Pasture Shrub Tussock 2 1 Temperature Rainfall Sunlight hours? Evapotranspiration? Sheep

  6. Using models to predict... 36 38 40 37 Cats Ferrets Stoats & Weasels 41 39 42 34 20 33 35 26 25 27 19 15 14 30 24 Rabbits Possums Mice Lizards Hedgehog RHD? 31 28 22 21 18 32 29 23 13 16 17 8 Pasture seed Shrub seed Tussock seed Invertebrates 11 4 6 9 5 7 10 12 Dan Roger Andrea Grant James 3 Pasture Shrub Tussock 2 1 Temperature Rainfall Sunlight hours? Evapotranspiration? Sheep

  7. Using models to predict... 36 38 40 37 Cats Ferrets Stoats & Weasels 41 39 42 34 20 33 35 26 25 27 19 15 14 30 24 Rabbits Possums Mice Lizards Hedgehog RHD? 31 28 22 21 18 32 29 23 13 16 17 8 Pasture seed Shrub seed Tussock seed Invertebrates 11 4 6 9 5 7 10 12 Dan Roger Andrea Grant James 3 Pasture Shrub Tussock 2 1 Temperature Rainfall Sunlight hours? Evapotranspiration? Sheep

  8. Area with pest control Site-based pest control in a landscape Short-term removal of nearby pest animals Area with effective pest reduction Re-invasion by pests

  9. Area with pest control Area with biodiversity benefits Site-based conservation in a landscape ? ?

  10. Area with pest control Dispersal, re-colonisation & gene flow Area with biodiversity benefits Site-based conservation in a landscape ? ?

  11. From single sites to future networks: ‘metapopulation models’ • ‘Classic’ (Levin) • Mainland – island • Patch population • Non-equilibrium metapopulation • combination of a - d Harrison & Taylor (1997)

  12. Site-based pest management Site-based pest management Creating a conservation network Survival rate of threatened species core edge edge core edge

  13. Site-based pest management Site-based pest management Network management Connect sites with some pest control timed to match optimal conditions Creating a conservation network Survival rate of threatened species core edge edge core edge

  14. Research summary • Focus on the impacts of invasive mammals W. Green Optimising biodiversity protection in Wellington’s Forest Parks

  15. Research summary • Focus on the impacts of invasive mammals • Ecosystems: forests, drylands, braided rivers, alpine areas

  16. Research summary • Focus on the impacts of invasive mammals • Ecosystems: forests, drylands, braided rivers, alpine areas • Research to link sites across landscapes

  17. Making a difference … • Close collaboration with agencies (DOC, regional councils, private groups) via ‘management experiments’ • Emphasis on publications • Students: next generation scientists • Rebecca Lawrence: rat behaviour & risk of predation • Hannah Windley: plant defence & possum browse • Tom Etherington: landscape connectivity & pest risk • Maggie Triska: restoration ecology • Liz Rayner: rabbit diet • NEW STUDENT: braided river ecosystems • (?)Eru Nathan: pest animal behaviour • New technology for providing information

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