P-A Åhlen - 40 years with wild boars
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Transcript of P-A Åhlen - 40 years with wild boars
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Sweden, 40 years with wild boars. Pros and Cons on the return of a highly reproductive
ungulate
P-A Åhlén, Swedish Association For Hunting and Wildlife Management
(Svenska Jägareförbundet)
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Raccoon Dog Project
P-A Åhlén, Swedish Association For Hunting and Wildlife Management(Svenska Jägareförbundet)
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Rear endFront
Up
Down
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Wild Boar (Sus scrofa)
• Annual home range 800-2000ha (>10 000ha)
• High reproduction• High mortality from hunting (94% hunting,
4% traffic, 2% diseases and drowning) • 70% of the annual food is related to
hunters feeding• Low dispersal abillity (4 km for sows and
16 km for males)
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Native and introduced range
http://www.untamedscience.com/biodiversity/wild-boar/
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History in Sweden
• Eradicated ≈ 1000, 1600, 1750, 1950• Last introduction1970-ish• Eradication…• Wild Boar law 1980
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•New law 1988
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Population growth 28%/yearDoubble numbers every 3 year (2,85)
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Speed 5 km / year (Truvé 2004)
Today 25% of possible area
30 more years of dispersal to populate possible areas
400 000 – 500 000 / year
PROGNOSIS DISPERSAL
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Limiting factors
50 cm
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Limiting factors
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Limiting factors
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Limiting factors / ASF
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Limiting factors / Management
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Tools of the trade
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Tools of the trade
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Tools of the trade
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Tools of the trade
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Tools of the trade
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Tools of the trade
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Detect presence - EWS
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EWS-Wild Boar
• 1 camera / 2000ha• 100 000ha → 50 cams• Food, sex, territory and tar
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Sex and territory
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Food
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MMS-kameror
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Management
• Baits and MMS-cams• Dogs and Hounds• Cars, GPS
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•1000 wildlife managers•50 countries
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INVASIVE SPECIES
• Quickly escalating development on tools and methods for control and eradication of invasive species
• Development of species specific immunocontrareceptive baits
• NZ predict development of tools for continental eradications within 5‐10 years
• Extreme conservation gains to come
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Future Game Management?• Challenge recreational hunters role in game management• If the hunters cannot control game populations down to levels set by the
society, new methods will replace them
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• Almost total consensus on recreational hunters inability to stabilize and reduce game populations
• Few believed us when we claimed that ungulate populations were regulated with recreational hunters in the Nordic countries
• Popular game species has the most secured conservation status
• Control of ungulate populations is a globally growing research branch
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• Massive discontent with recreational hunters ability to reduce game populations
• Ban for wild boar hunting in some US states
• Poison, professional hunters, helicopters, snares, corral traps, electrocution devices with solar panels that recharge for next boar and so on
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Lessons from Sweden
• Farmers with no hunting rights
• Commercial hunting• High lease cost
-Feeding -Protection of sows
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Effekten av villsvinets (Sus scrofa) populasjonsvekst i Sverige på populasjonene av rødrev (Vulpes vulpes), grevling (Meles meles) og storfugl (Tetrao urogallus)Bjørnrud 2013
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Thank you!