1 / 11

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. ?. ?. ?. ?. ?. ?. ?.

dean-hoffman
Download Presentation

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

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related