Transcript The Great Horned Owl Diet

Great Horned Owl Diet
Geoffrey H. Palmer
Intro to Great Horned Owls
Intro to Great Horned Owls
• Classification
Intro to Great Horned Owls
• Classification
• Distribution
Intro to Great Horned Owls
• Classification
• Distribution
• Morphology
Intro to Great Horned Owls
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•
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Classification
Distribution
Morphology
Behavior & Diet
Does diet vary over time?
Why would diet vary over time?
Why would diet vary over time?
1. Prey availability & vulnerability
Why would diet vary over time?
1. Prey availability & vulnerability
2. Breeding season of owls
How can I measure diet variation?
How can I measure diet variation?
Field Site
Methods
19 Feb 2008 to 05 Apr 2008
Results
• 44 pellets
• 46 individuals
• 7 groups of small mammals
Dipodomys – Kangaroo rats
• 3 species
• 2 individuals
Reithrodontomys – Harvest mice
• 3 species
• 4 individuals
Sigmodon – Cotton rats
• 4 species
• 4 individuals
Neotoma - Woodrats
• 1 species
• 2 individuals
Peromyscus – Deer mice
• 4 species
• 15 individuals
Pocket Mice
• 5 species
• 17 individuals
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
19
10
8
5
2
44
Pellets
Importance
1. Las Cienegas
Management Practices
Management Practices
Change in prey species:
1. Availability
2. Vulnerability
Importance
1. Las Cienegas
2. Range wide
Importance
1. Las Cienegas
2. Range wide
3. Other species
Importance
1. Las Cienegas
2. Range wide
3. Other species
Importance
1. Las Cienegas
2. Range wide
3. Other species
Importance
1. Las Cienegas
2. Range wide
3. Other species
Importance
1. Las Cienegas
2. Range wide
3. Other species
Importance
1. Las Cienegas
2. Range wide
3. Other species
Acknowledgements
Dr. JodyLee Duek
Jess Gwinn
Nate Gwinn
David Kahrs
Sonja Smith
?Questions?