What drives dispersal
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What drives dispersal?. Mark Andruskiw. Costs & benefits. Traditional hypotheses:. Competition for resources Competition for mates Inbreeding avoidance. Berteaux and Boutin 2000. Cone abundance:. Population density:. mom. kids. Philopatry vs. dispersal:. Berteaux and Boutin 2000.

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What drives dispersal
What drivesdispersal?

Mark Andruskiw



Traditional hypotheses
Traditional hypotheses:

  • Competition for resources

  • Competition for mates

  • Inbreeding avoidance





Philopatry vs dispersal

mom

kids

Philopatry vs. dispersal:

Berteaux and Boutin 2000



Model mom s decision1
Model mom’s decision:

where:

Y = mother’s behavior

(keep, share, bequeath)

X1..Xn = explanatory variables



Model mom s decision3
Model mom’s decision:

Individual level


Model mom s decision4
Model mom’s decision:

Individual level

Weight by quality

Expand neighborhood


Model mom s decision5
Model mom’s decision:

Individual level

Weight by quality

Expand neighborhood


Survival cost

Probability

Survival cost:


Model kid s decision
Model kid’s decision:

where:

Y = dispersal distance

X1..Xn = explanatory

variables



Manipulations
Manipulations:

r10

male

r2

fem

r1

male

r4

fem

r9

fem

r3

male

F

r8

fem

r5

fem

r6

fem

r7

male


Core squirrel data
Core squirrel data:

  • Family information

  • Paternity

  • Midden ownership (vacancy, disp. dist)

  • Cone counts

  • Seen sheets (predators, alternate prey)



Logistic needs
Logistic needs:

1 technician

35+ radios

1 telemetry flight (?)

2 receivers


2005 papers
2005 papers:

Nest switching in relation to flea load


2005 papers1
2005 papers:

Dad?

Kin recognition in red squirrels


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