great horned owl diet geoffrey h. palmer. intro to great horned owls

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Great Horned Owl Diet Geoffrey H. Palmer

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Page 1: Great Horned Owl Diet Geoffrey H. Palmer. Intro to Great Horned Owls

Great Horned Owl Diet

Geoffrey H. Palmer

Page 2: Great Horned Owl Diet Geoffrey H. Palmer. Intro to Great Horned Owls

Intro to Great Horned Owls

Page 3: Great Horned Owl Diet Geoffrey H. Palmer. Intro to Great Horned Owls

Intro to Great Horned Owls

• Classification

Page 4: Great Horned Owl Diet Geoffrey H. Palmer. Intro to Great Horned Owls

Intro to Great Horned Owls

• Classification• Distribution

Page 5: Great Horned Owl Diet Geoffrey H. Palmer. Intro to Great Horned Owls

Intro to Great Horned Owls

• Classification• Distribution• Morphology

Page 6: Great Horned Owl Diet Geoffrey H. Palmer. Intro to Great Horned Owls

Intro to Great Horned Owls

• Classification• Distribution• Morphology• Behavior & Diet

Page 7: Great Horned Owl Diet Geoffrey H. Palmer. Intro to Great Horned Owls

Does diet vary over time?

Page 8: Great Horned Owl Diet Geoffrey H. Palmer. Intro to Great Horned Owls

Why would diet vary over time?

Page 9: Great Horned Owl Diet Geoffrey H. Palmer. Intro to Great Horned Owls

Why would diet vary over time?

1. Prey availability & vulnerability

Page 10: Great Horned Owl Diet Geoffrey H. Palmer. Intro to Great Horned Owls

Why would diet vary over time?

1. Prey availability & vulnerability

2. Breeding season of owls

Page 11: Great Horned Owl Diet Geoffrey H. Palmer. Intro to Great Horned Owls

How can I measure diet variation?

Page 12: Great Horned Owl Diet Geoffrey H. Palmer. Intro to Great Horned Owls

How can I measure diet variation?

Page 13: Great Horned Owl Diet Geoffrey H. Palmer. Intro to Great Horned Owls

Field Site

Page 14: Great Horned Owl Diet Geoffrey H. Palmer. Intro to Great Horned Owls

Methods

19 Feb 2008 to 05 Apr 2008

Page 15: Great Horned Owl Diet Geoffrey H. Palmer. Intro to Great Horned Owls

Results

• 44 pellets

• 46 individuals

• 7 groups of small mammals

Page 16: Great Horned Owl Diet Geoffrey H. Palmer. Intro to Great Horned Owls

Dipodomys – Kangaroo rats

• 3 species

• 2 individuals

Page 17: Great Horned Owl Diet Geoffrey H. Palmer. Intro to Great Horned Owls

Reithrodontomys – Harvest mice

• 3 species

• 4 individuals

Page 18: Great Horned Owl Diet Geoffrey H. Palmer. Intro to Great Horned Owls

Sigmodon – Cotton rats

• 4 species

• 4 individuals

Page 19: Great Horned Owl Diet Geoffrey H. Palmer. Intro to Great Horned Owls

Neotoma - Woodrats

• 1 species

• 2 individuals

Page 20: Great Horned Owl Diet Geoffrey H. Palmer. Intro to Great Horned Owls

Peromyscus – Deer mice

• 4 species

• 15 individuals

Page 21: Great Horned Owl Diet Geoffrey H. Palmer. Intro to Great Horned Owls

Pocket Mice

• 5 species

• 17 individuals

Page 22: Great Horned Owl Diet Geoffrey H. Palmer. Intro to Great Horned Owls

Visits Totals

Dipidomys 1 1 0 0 0 2

Reithrodotomys 3 0 1 0 0 4

Sigmidon 2 1 0 1 0 4

Peromyscus 5 4 3 2 1 15

Pocket mice 8 3 6 0 0 17

Neotoma 1 0 0 1 0 2

Unknown 0 0 0 0 2 2

Pellets 19 10 8 5 2 44

Page 23: Great Horned Owl Diet Geoffrey H. Palmer. Intro to Great Horned Owls

Importance

1. Las Cienegas

Page 24: Great Horned Owl Diet Geoffrey H. Palmer. Intro to Great Horned Owls

Management Practices

Page 25: Great Horned Owl Diet Geoffrey H. Palmer. Intro to Great Horned Owls

Management Practices

Change in prey species:

1. Availability

2. Vulnerability

Page 26: Great Horned Owl Diet Geoffrey H. Palmer. Intro to Great Horned Owls

Importance

1. Las Cienegas

2. Range wide

Page 27: Great Horned Owl Diet Geoffrey H. Palmer. Intro to Great Horned Owls

Importance

1. Las Cienegas

2. Range wide

3. Other species

Page 28: Great Horned Owl Diet Geoffrey H. Palmer. Intro to Great Horned Owls

Importance

1. Las Cienegas

2. Range wide

3. Other species

Page 29: Great Horned Owl Diet Geoffrey H. Palmer. Intro to Great Horned Owls

Importance

1. Las Cienegas

2. Range wide

3. Other species

Page 30: Great Horned Owl Diet Geoffrey H. Palmer. Intro to Great Horned Owls

Importance

1. Las Cienegas

2. Range wide

3. Other species

Page 31: Great Horned Owl Diet Geoffrey H. Palmer. Intro to Great Horned Owls

Importance

1. Las Cienegas

2. Range wide

3. Other species

Page 32: Great Horned Owl Diet Geoffrey H. Palmer. Intro to Great Horned Owls

Importance

1. Las Cienegas

2. Range wide

3. Other species

Page 33: Great Horned Owl Diet Geoffrey H. Palmer. Intro to Great Horned Owls

Acknowledgements

Dr. JodyLee Duek

Jess Gwinn

Nate Gwinn

David Kahrs

Sonja Smith

Page 34: Great Horned Owl Diet Geoffrey H. Palmer. Intro to Great Horned Owls

?Questions?