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Putting Animal Physiology and Ecology together… Grizzly Bears. Ecological Interconnections. CB 54.2. Interconnections. We are only one of millions of species on earth. Why are species going extinct?. 2%. 36%. 39%. 23%. Nearly Extinct Species: maybe only 100 individuals exist. CB 55.3.

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Presentation Transcript
slide3

CB 54.2

Interconnections

slide7

Habitat loss and fragmentation has been extensive in the US due to human modification of the environment

slide8

What responsibility do we have for the well-being of non-humans?

Under what circumstance should we put the needs of non-humans above the needs of humans?

slide10

How are bears related to each other?

Bears (1993) Ian Stirling et al., Weldon Owen Pty Ltd pg 28

slide11

12,000 years ago: the grizzly ancestor short-faced bear

Bears (1993) Ian Stirling et al., Weldon Owen Pty Ltd pg 15

slide12

Short-faced vs grizzly bears

Bears (1993) Ian Stirling et al., Weldon Owen Pty Ltd pg 17 and 23

slide13

How closely related are these bear species?

Bears (1993) Ian Stirling et al., Weldon Owen Pty Ltd pg 28

slide14

Grizzly-Polar bear hybrid (from a zoo)

Bears (1993) Ian Stirling et al., Weldon Owen Pty Ltd pg 200

slide15

Grizzly bears live most of their lives alone

Bears (1993) Ian Stirling et al., Weldon Owen Pty Ltd pg 78

slide16

Grizzly bears live most of their lives alone.

What do they do?

Bears (1993) Ian Stirling et al., Weldon Owen Pty Ltd pg 78

slide19

Some grizzlies are excellent predators, but most eat carrion.

Bears (1993) Ian Stirling et al., Weldon Owen Pty Ltd pg 85

slide21

Grizzlies have an amazing ability to gain and lose weight.

Bears (1993) Ian Stirling et al., Weldon Owen Pty Ltd pg 62 and 63

slide22

Grizzlies constant search for food can lead to conflicts with humans.

Bears (1993) Ian Stirling et al., Weldon Owen Pty Ltd pg 186

slide23

Grizzlies constant search for food can lead to conflicts with humans.

Bears (1993) Ian Stirling et al., Weldon Owen Pty Ltd pg 215

slide24

Different teeth and diets

grizzly

cat

dog

panda

Bears (1993) Ian Stirling et al., Weldon Owen Pty Ltd pg 54

slide25

Grizzly reproduction

Bears (1993) Ian Stirling et al., Weldon Owen Pty Ltd pg 59

slide27

Grizzly cubs are born in the den and are very small (~1 lb)

Bears (1993) Ian Stirling et al., Weldon Owen Pty Ltd pg 58

slide28

Female Grizzly Bear reproductive cycle

den w/

mother

fall

juveniles

on own

winter

summer

young

born

fertiliz-ation

spring

Females are not fertile when caring for offspring

slide29

Female bears are very protective of their young

Bears (1993) Ian Stirling et al., Weldon Owen Pty Ltd pg 76

slide30

Infanticide: males will try to kill young so that mother will become fertile

Bears (1993) Ian Stirling et al., Weldon Owen Pty Ltd pg 77

slide32

Current Grizzly Bear range

Historical Grizzly Bear range

slide34

Hunters

Bears (1993) Ian Stirling et al., Weldon Owen Pty Ltd pg 216

slide36

Yellowstone NP

63 mi

54 mi

  • 466 mi of roads
  • 950 mi of backcountry trails
  • 97 trailheads
  • 287 backcountry campsites
slide39

CB 55.18

Where do grizzly bears fit?

Are they important?

How much of our resources should we share with grizzly bears?

slide40

Animal behavior is unpredictable and inexplicable

Bears (1993) Ian Stirling et al., Weldon Owen Pty Ltd pg 231