Grizzly Bear Conservation in Southwest BC Dr. Bruce McLellan - - PowerPoint PPT Presentation

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grizzly bear conservation in southwest bc
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Grizzly Bear Conservation in Southwest BC Dr. Bruce McLellan - - PowerPoint PPT Presentation

Oct 31, 2022 552 likes •935 views

Grizzly Bear Conservation in Southwest BC Dr. Bruce McLellan Redlist Authority IUCN Bear Specialist Group Bear Specialist Group Conservation-related issues regarding 7 species of terrestrial bears 190 members 61 range countries and

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Grizzly Bear Conservation in Southwest BC

  • Dr. Bruce McLellan

Redlist Authority IUCN Bear Specialist Group

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Conservation-related issues regarding

7 species of “terrestrial” bears

Bear Specialist Group

190 members 61 range countries

and former range countries

(missing 6 range countries)

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110,000 24,000 58,000

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Asia

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Himalaya 130 – 220 Hindu Kush 15 - 30 Western China 6300 bears Gobi 27 - 45 Karakoram Pamir 1000 – 1500 Russia/Kazakhstan 110,000 bears Tian Shan Mts < 1000 CR CR EN VU VU

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East Anatolia 3000 bears

Zagros 100 bears Elburz 1300 bear

West Anatolia 300 Kure Mts 400 Toros 100 West Toros 100 <50 <50

Caucasus 1500 bears

250

< 20

20

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Cantabrian 200 Pyrenean 25 Abruzzo 45 Alps 45 Scandinavian 3,400 Carpathian 8,100 Dinaric/Pindos 3,000 East Balkans 610 Baltic 710

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Yellowstone VU Selkirks, Cabinet Yahk 2 EN & VU South Coast Mts 3 CR ABC Islands LC Kodiak LC

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18-22 bears < 10 < 10

Stein Nahatlatch Hat Ck Cascade Mountains

Garibaldi Pitt < 10 South Chilcotin > 220

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  • Mt. Currie

Lillooet

South Chilcotin

Stein/Nahatlatch

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Local Grizzly Population Trends

5 10 15 20 25

2000 2005 2010 2015 2020

Density (Bears/1000km2 )

Southern Chilcotin Stein Nahatlach

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Some vital rate comparisons

South Chilcotin

  • 17 F, 10 M collared, 0 died
  • Cub litter size

2.4

  • Cub survival

1.0

  • 2 yr-old recruit

0.21

  • DNA recruitment

0.26

  • mass Ad F, spring

111 kg

  • He

0.58

Stein Nahatlatch

  • 9 F, 8 M collared, 4 died

(3 natural deaths)

  • Cub litter size

2.0

  • Cub survival

0.3

  • 2 yr-old recruit

0.13

  • DNA recruitment

0.12

  • mass Ad F, spring 97 kg
  • He

0.49

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Human caused mortality

Attractants – indirect safety

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Ungulate hunter caused mortality

Self defence At camps Increases with road access.

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Local grizzly food

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Southern Chilcotin Diet

0% 20% 40% 60% 80% 100% 0% 20% 40% 60% 80% 100%

WB Pine Meat Herb Berry

Stein/Nahatlatch Diet

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10 20 30 40 50

May Jun Jul Aug Sep Oct

AVERAGE BODY FAT (%)

MONTH OF YEAR

Body fat by month

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0.5 1 1.5 2 2.5 3 1 2 3 4 5 Cubs/Parous Female Previous Year Huckleberry Index

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Spring-Early Summer

Similar in both areas

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Late Summer - Fall

MORE IN SOUTH CHILCOTIN THAN STEIN NAHATLATCH

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Dispersal

Distance from mother’s home range

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South Chilcotin Stein Nahatlatch

Pemberton

1 M 4 M

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Other Barriers to connectivity

  • Recreation /displacement?

#Hashtag

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Needed for Recovery of all Isolated Populations

  • Immigration of females by making

fractures safe for bears to live in.

  • Move bears.
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Thank you