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Using a possum’s parentage to predict possible pathways across landscapes

Using a possum’s parentage to predict possible pathways across landscapes. Thomas R. Etherington. Invasive spread in New Zealand. Brushtail Possum ( Trichosurus vulpecula ). Red Deer ( Cervus elaphus ). adapted from King (2005). Patch-matrix landscape dispersal. ?. ?. ?. ?. ?. ?. ?.

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Using a possum’s parentage to predict possible pathways across landscapes

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  1. Using a possum’s parentage to predict possible pathways across landscapes Thomas R. Etherington

  2. Invasive spread in New Zealand Brushtail Possum (Trichosurus vulpecula) Red Deer (Cervus elaphus) adapted from King (2005)

  3. Patch-matrix landscape dispersal ? ? ? ? ? ? ? ? Year 3 Year 4 Year 1 Year 2

  4. Matrix composition Homogenous Kouchibouguac National Park, Canada Heterogeneous Puhoi River Valley, New Zealand

  5. Friction surface Landscape Forest Grass Rock Water Cost 1 10 100 1000

  6. Least-cost paths Ca + Cb 2 cd ab = Dab × Cb + Cc 2 a b cd bc = D bc × c (D = distance, C = cost) LCPac = cd ab + cd bc LCP = 32×103 Cost LCP = 57×103 1 16×103 m Start point 10 End point 100 Least-cost pathway LCP = 16×103 1000

  7. Least-cost spread 20000 15000 10000 5000 from Lockwood et al. (2007)

  8. Connectivity and Relatedness ? ? ? ? ? ? ? ?

  9. Hawke’s Bay Possum Genetics Genetic distance Euclidean distance (m) Separated by a river Genetic distance Not separated by a river Euclidean distance (m) from Cowan et al. (2006)

  10. Hawke’s Bay Possum Genetics Wide river Genetic distance High Low N 10 Kilometres

  11. Acknowledgements

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