phi sigma symposium presentation
TRANSCRIPT
A Comparison of Two Methods for Quantifying Remige Structure Galen Dolkas
Slater Museum of Natural History
Advisor: Peter Wimberger
Class Aves
Wings and Remiges
Primary Feathers
Secondary FeathersP1
P10
S1SP
Past Research
From Pap et al. 2015
From Bachmann et al. 2007
Order Strigiformes
Methods- Remige Measurements
y
y
Methods- Remige Measurements
y
y
Methods- Remige Measurements
Pythagorean Properties
Pythagorean Properties
Par BD= Perp BD * sin(BA)
0 10 20 30 40 50 60 70 80 900.0
1.0
2.0
3.0
4.0
5.0
6.0
Bubo virginianus
Barb Angle (°)
Bar
b De
nsity
(bar
bs/ m
m)
Outer vane parallel barb density ranges
Inner vane parallel barb density ranges
Perpendicular barb densities
0 10 20 30 40 50 60 70 80 900.0
1.0
2.0
3.0
4.0
5.0
6.0Bubo virginianus
Tyto alba
Barb Angle (°)
Bar
b De
nsity
(bar
bs/ m
m)
Outer vane parallel barb density ranges
Inner vane parallel barb density ranges
Perpendicular barb densities
-6 -4 -2 0 2 4 6
-3-2
-10
12
3
PC1 vs. PC2
PC1
PC
2
Forest
Forest EdgeGrassland
PCA of Habitat
Parallel Barb Density
-4 -2 0 2 4 6 8
-3-2
-10
1
PC1 vs. PC2
PC1
PC
2
Forest
Forest EdgeGrassland
Perpendicular Barb Density
-4 -2 0 2 4
-4-2
02
PC1 vs. PC2
PC1
PC
2
Forest
Forest Edge
Grassland
-4 -2 0 2 4 6 8
-3-2
-10
1
PC1 vs. PC2
PC1
PC
2
Forest
Forest EdgeGrassland
-4 -2 0 2 4
-4-2
02
PC1 vs. PC2
PC1
PC
2
Forest
Forest Edge
Grassland
Barb Angle
PCA of Foraging Strategy
Long Perch: Foraging at a perch, and waiting at each perchActive Flapping: Foraging requires actively flapping of wingsShort Perch: Foraging at a perch, then immediately flying to another perchSoaring: Foraging does not require active wing flapping
-6 -4 -2 0 2 4 6
-3-2
-10
12
3
PC1 vs. PC2
PC1
PC
2
Active FlappingLong Perch
Short PerchSoaring
-4 -2 0 2 4 6 8
-3-2
-10
1
PC1 vs. PC2
PC1
PC
2
Active Flapping
Long Perch
Short Perch
Soaring
-4 -2 0 2 4
-4-2
02
PC1 vs. PC2
PC1
PC
2
Active Flapping
Long Perch
Short Perch
Soaring
Parallel Barb Density Perpendicular Barb Density Barb Angle
Future Research
0 500 1000 1500 2000 2500 30000.0
2.0
4.0
6.0
8.0
10.0
12.0
f(x) = 14.5730408655781 x^-0.188813069172804R² = 0.426174408322631
Bird Mass
P10
Out
er V
ane
Perp
Bar
b De
nsity
Acknowledgements
– Peter Wimberger for his tireless help and advice
– The Slater and Burke Museums for use of their collections
– The Slater staff for their advice and support
– Peter Hodum and Carrie Woods for answering all my stats questions
– ΦΣ, for putting on this symposium
– You, for coming to this symposium
Questions?
Bubo virginianus Remiges
10 20 30 40 50 60 70 80 900.00.51.01.52.02.53.03.54.04.5
Barb Angle
Barb
Den
sity
10 20 30 40 50 60 70 80 900.00.51.01.52.02.53.03.54.04.5
Barb Angle
Barb
Den
sity
10 20 30 40 50 60 70 80 900.00.51.01.52.02.53.03.54.04.5
Outer Vane
Inner Vane
Outer Vane
Inner VaneBarb Angle
Barb
Den
sity
10 20 30 40 50 60 70 80 900.00.51.01.52.02.53.03.5
Barb Angle
Barb
Den
sity
P10P1
S1 SP