1 / 21

Market Hunting - See text

Market Hunting - See text. Midcontinent Light Geese Example Includes Greater and Lesser Snow Geese (blue and white color phases) and Ross geese. Greater and Lesser Snow geese on Atlantic and Mississippi Flyways Use Hudson’s Bay

zack
Download Presentation

Market Hunting - See text

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. Market Hunting - See text

  2. Midcontinent Light Geese Example Includes Greater and Lesser Snow Geese (blue and white color phases) and Ross geese

  3. Greater and Lesser Snow geese on Atlantic and Mississippi Flyways Use Hudson’s Bay as breeding ground and stopover areas (“Midcontinental light geese”)

  4. 1965present: Greater Snow 30,000 600,000 Lesser Snow 1 3 million Ross 30,000 400,000 Population sizes from 1968-1993 • Why the Increase? • Agriculture • Sanctuaries • Reduced Hunter Harvest • Climate shift on BG • Result: • Higher adult survival/condition • Higher repro

  5. Goose “grubbing” for rhizomes & tubers results in major shifts in vegetation

  6. Hudson Bay Study Site 1984 Is it really geese? 1997

  7. Is it really geese? – The exclosure experiment At Hudson Bay 35% of habitat destroyed, 30 % damaged, 35% overgrazed

  8. Recall the ways hunting can be used to alter outcome: • Season • Method of Take • Bag Limit • # of Hunters • Which animals

  9. Management Response • Conservation Order Light Goose Hunts ordered by USFWS • Extend Hunting Season into Spring • Methods • Electronic calls • No limit on number shells shotgun contains • Bag limit • No daily bag limit imposed, set by states

  10. USFWS Final Environmental Impact Statement: Light Goose Management June 2007 The management goal for light geese in the mid-continent region is to reduce the population by 50% from the level observed in the late 1990s. The management goal for greater snow geese is to reduce the population to 500,000 birds.

  11. Lethal Trapping - More controversial than hunting See Table 10-3 for pro-con views Leghold trap Snare

  12. 1994 AZ Ban on trapping on federal/state lands • Effect on harvest – lab exercise • Current Regulations: • 1) Only on private lands or special designations • 2) License, written exam, course required • 3) All traps labeled, padded jaws, offset • 4) Checked daily, kill target or release non-target • 5) Written annual report to AZGFD • Exemptions: • Livestock losses • Federal, state, county, local health departments • Rodent control

  13. Examples of use of trapping: • Mesocarnivores on refuges/breeding grounds • Garretson and Rohwer 2001. JWM 65:398-405. • 41km2 sites, ½ trapped other not trapped • Trappers paid $18,000 for 5 mos • 2404 coons, skunks and foxes • Response: Doubled duck nesting success 23% vs 43% and return rate • (so what was management goal in this case?) • Recommendations: • 1) Treat large areas, with high repro potential • 2) May not be necessary where coyotes prey on • coons, skunks and foxes • 3) Need public acceptance – rural area so • acceptance was… high or low?

  14. 2) Introduced Exotic Species Nutria (Coypu) Native of South America 5-8 young/litter 2-3 litters per year Introduced for fur in 1930’s

  15. Intro in La in 1930 – 20 million by 1950 1970 – 10,000 trappers in La 1998 - 1,700

  16. Effects: Destroy levees Consume crops Convert marsh to open water Cost: millions of $ Chesapeake Bay of Maryland CONTROL Options???

  17. Lethal Trapping – worked in Great Britain where coypu eradicated • Alternatives to lethal trapping? • 1) Live trapping and removal • Cost • Remove to where? • 2) Contraception • Cost • Availability • 3) Poison • Non-target effects • Reduced suffering? • Limiting access • Reintroduce predators • Feasibility • Acceptance

  18. Arizona’s Coypu?

More Related