1 / 39

Harvesting Wildlife

Harvesting Wildlife. Greg Baxter School of Natural and Rural Systems Management The University of Queensland, Gatton Campus. Presentation to North Carolina State University University June 22, 2007. Wildlife includes living, wild harvested resources. Includes;

boone
Download Presentation

Harvesting Wildlife

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. Harvesting Wildlife Greg Baxter School of Natural and Rural Systems Management The University of Queensland, Gatton Campus Presentation to North Carolina State University University June 22, 2007

  2. Wildlife includes living, wild harvested resources • Includes; • animals and their products (e.g. skins, ivory) • plants and their products (e.g. seeds, wax, natural pigments)

  3. Types of harvesting • Commercial • e.g. whales or kangaroos • profit driven • large numbers (roos >2,000,000 p.a.) • harvest not always benefit to locals

  4. Types of harvesting • Commercial • e.g. whales or kangaroos • profit driven • large numbers • Subsistence • to satisfy personal needs • can be large numbers, but local extent • now confined to Africa, S. America, parts of S.E. Asia

  5. Types of harvesting • Commercial • e.g. whales or kangaroos • profit driven • large numbers • no benefit to locals • Subsistence • to satisfy personal needs • can be large numbers, but local extent • now confined to Africa, S. America, parts of S.E. Asia • ‘Bush meat’ • to meet demands of poor urban immigrants • driven by taste and cost • huge, growing demand • transport of products

  6. Types of harvesting • Commercial • Subsistence • ‘Bush meat’ • to meet demands of poor urban immigrants • driven by taste and cost • huge, growing demand • transport of products • Cultural (including medicines) • e.g. dugongs by Aust. Aborigines, beluga whales by Inuit • small scale • local • can affect endangered/vulnerable species

  7. Types of harvesting • Commercial • Subsistence • ‘Bush meat’ • Cultural • Collector (including trophy hunting) • people want to own exotic animals/products • want hunting experience • national and international • huge volumes • consumer divorced from consequences of collecting

  8. Each type of harvesting • has different driver • different aerial extent • different mode of operation Therefore different modes of control/enforcement are applicable

  9. Different harvests require different controls

  10. Different harvests require different controls

  11. Different harvests require different controls

  12. Different harvests require different controls

  13. Different harvests require different controls

  14. Mode of harvest varies

  15. Different harvesting requires different controls • Must be international

  16. Different harvesting requires different controls • Must be international • Policing and enforcement insufficient

  17. Different harvesting requires different controls • Must be international • Policing and enforcement insufficient • Must address poverty

  18. Different harvesting requires different controls • Must be international • Policing and enforcement insufficient • Must address poverty • Must address cultural issues

  19. Different harvesting requires different controls • Must be international • Policing and enforcement insufficient • Must address poverty • Must address cultural issues • Understand there powerful vested interests

  20. Different harvesting requires different controls • Must be international • Policing and enforcement insufficient • Must address poverty • Must address cultural issues • Understand there powerful vested interests • Recognise economic and conservation outcomes can be achieved

  21. Controlling Harvest • Quotas • Regulating effort • Spatial control

  22. Quotas Preselected proportion of population(s) taken Requires; • Accurate & precise population estimate EACH harvest • Regular population monitoring (absolute abundance) • Good control over non-quota (illegal) take

  23. Obtaining an estimate of absolute abundance • Time consuming • Costly • Complex An example from the kangaroo industry (Acknowledgement to Gordon Grigg)

  24. Regulating Effort Limit how and/or when harvest can occur e.g. nest mesh size, rifle calibre, closed season(s) Requires; Does Not Require; • Compliance with regulations • Appropriate effort is specified • Monitoring of population trend • Estimate of absolute abundance Control is self-tracking with changes in population size

  25. Spatial Control Limit WHERE animals can be taken, not how many, or how = places where animals can be harvested

  26. Spatial Control Harvest between 0 – 100% in black squares Animals disperse into hunting areas Then, monitor trend in non-hunted areas

  27. Monitoring in Spatial Control If population in non-hunted areas is about constant, maintain situation

  28. Monitoring in Spatial Control If population in non-hunted areas is decreasing, restrict hunting areas

  29. Monitoring in Spatial Control If population in non-hunted areas is increasing, increase hunting areas

  30. Spatial Control Requires; Estimate of relative abundance – easy, cheap, repeatable Used; Fisheries, marine parks e.g. GBRMPA

  31. Harvest Population Size How is harvest set for quotas? Assumes sustainable harvest Must understand the link between harvest size and population size and know what population size is

  32. There are two population sizes (A & B) that will deliver any given SY Harvest at the higher one A B How is harvest set Sustained Yield (SY) Population Size

  33. There is only one populations size (A) that will produce the maximum sustained yield (MSY). MSY A How is harvest set Sustained Yield (SY) Population Size

  34. MSY Harvesting at MSY is dangerous Even a small error in population size estimate will lead to over-harvest Population usually discounted by 15% and population harvested there Sustained Yield (SY) A – 15% A Population Size

  35. Can harvest have a conservation benefit? If the following conditions are met: • Benefit accrues to the land owner/occupier • Exploitation does not endanger the species (or look alikes) • Populations are monitored and managed • Exploitation enhances habitat

  36. Questions ?

More Related