esa13 spatial and temporal synchrony in small mammal populations
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Spatial and temporal synchrony in small mammal populations: the role of intrinsic and extrinsic
factors
Aaron C. Greenville, Glenda M. Wardle and Chris R. DickmanDesert Ecology Research Group
School of Biological SciencesUniversity of Sydney
@AarontheEcolog
Spatial dynamics
4
3
1
2
i = growth rate
Time
Abun
d
Time
Abun
d
Time
Abun
d
Time
Abun
d
Introduction Methods Results Conclusion
Moran effect
Introduction Methods Results Conclusion
Aims
1. Spatial structure of small mammal populations
– Moran effect?
2. Density dependence and extrinsic factors
Introduction Methods Results Conclusion
Study species
Photo by Bobby Tamayo
Sandy inland mouse, Ps. hermannsburgensis, 12 g
Lesser hairy-footed dunnart, Sminthopsis youngsoni, 10 g
Mulgara, Dasycercus blythi, 100 g
Ningaui, Ningaui ridei, 8 g
Dasyurid marsupials:
Rodents:
Introduction Methods Results Conclusion
3
2
9
6
5
4
7 8
1
3
1
1
2
2
2
2 1
1
1
2
1
1
2
2
1 1
1
2
2
1
3
3
2
3 1
1
1
1
1
1
1
1
1 1
1
• Asynchronous• Oasis• Wildfire• Productivity• Synchronous
• Multivariate autoregressive state-space (MARSS) models
1. Spatial structure
Introduction Methods Results Conclusion
2. Covariates
1
2
1
1
2
2
1 1
1
Introduction Methods Results Conclusion
Results:
1
1
11
1
1
1
1
1
Results:
Introduction Methods Results Conclusion
0 20 40 60 80 100 120
01234
0 20 40 60 80 100 120
01234
Trips
Ab
un
dan
ce (
log)
Photo by Bobby Tamayo
Sandy inland mouse, Ps. hermannsburgensis, 12 g
1
1
11
1
1
1 1
1
1
2
11
2
2
1 1
1
Results:
Introduction Methods Results Conclusion
0 20 40 60 80 100 120
0.0
1.0
2.0
0 20 40 60 80 100 120
0.0
1.0
2.0
Trips
Abu
ndan
ce (l
og)
3
2
9
6
5
4
7 8
1
Introduction Methods Results Conclusion
0 40 80 120
0.0
1.5
3.0
Main Camp
0 40 80 120
0.0
1.5
3.0
Carlo
0 40 80 120
0.0
1.5
3.0
Field River South
0 40 80 120
0.0
1.5
3.0
South Site
0 40 80 120
0.0
1.5
3.0
Kunnamuka Swamp East
0 40 80 120
0.0
1.5
3.0
Shitty Site
0 40 80 120
0.0
1.5
3.0
Tobermorey East
0 40 80 120
0.0
1.5
3.0
Field River North
0 40 80 120
0.0
1.5
3.0
Tobermorey West
Trips
Abu
ndan
ce (l
og)
Introduction Methods Results Conclusion
3
2
9
6
5
4
7 8
1
0 20 60 100
0.0
1.0
2.0
Main Camp
0 20 60 100
0.0
1.0
2.0
Carlo
0 20 60 100
0.0
1.0
2.0
Field River South
0 20 60 100
0.0
1.0
2.0
South Site
0 20 60 100
0.0
1.0
2.0
Kunnamuka Swamp East
0 20 60 100
0.0
1.0
2.0
Shitty Site
0 20 60 100
0.0
1.0
2.0
Tobermorey East
0 20 60 100
0.0
1.0
2.0
Field River North
0 20 60 100
0.0
1.0
2.0
Tobermorey West
Trips
Abun
danc
e (lo
g)
Photo by Bobby Tamayo
Sandy inland mouse, Ps. hermannsburgensis, 12 g
0.29 (0.07, 0.5)
0.25 (0.07, 0.44)
0.53 (0.28, 0.77)
0.23 (0.05, 0.42)
0.38 (0.13, 0.63)
0.16 (0.29, 0.03)
0.27 (0.44, 0.1)
Introduction Methods Results Conclusion
Extrinsic factors:
0.19 (0.05, 0.33)
0.26 (0.11, 0.41)
1.79 (0.46, 3.12)
0.05 (0.002, 0.09)
0.1 (0.01, 0.05)
Introduction Methods Results Conclusion
Extrinsic factors:
Conclusion• Moran effect present for rodents -synchronous
– Landscape-scale– Density dependency
• Mulgara similar to their prey + wildfire– Landscape-scale– Density dependency
• Insectivorous dasyurids – asynchronous– Local-scale– Weak density dependency
• ManagementIntroduction Methods Results Conclusion
Acknowledgements• Bobby Tamayo and the DERG team.• All our volunteers.• Bush Heritage Australia.• Bedourie Hotel.• ARC, APA and Paddy Pallin Science Grant.
Volunteer info: http://bit.ly/1fxVOhH
For more: www.AarontheEcolog.wordpress.com
@AarontheEcolog
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