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Seed Mast Induced Population Synchrony in the White-footed Mouse Peromyscus leucopus

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Seed Mast Induced Population Synchrony in the White-footed Mouse Peromyscus leucopus. Pei-Jen Shaner March 2005. Population Synchrony. Definition: Spatial covariation in population density fluctuations Measure: Cross-correlation coefficient (Bjørnstad et al. 1999). - PowerPoint PPT Presentation
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Seed Mast Induced Population Synchrony Seed Mast Induced Population Synchrony in the White-footed Mouse in the White-footed Mouse Peromyscus Peromyscus leucopus leucopus Pei-Jen Shaner Pei-Jen Shaner March 2005 March 2005
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Page 1: Seed Mast Induced Population Synchrony in the  White-footed Mouse  Peromyscus leucopus

Seed Mast Induced Population Seed Mast Induced Population

Synchrony in the White-footed Mouse Synchrony in the White-footed Mouse

Peromyscus leucopusPeromyscus leucopus

Pei-Jen ShanerPei-Jen ShanerMarch 2005March 2005

Page 2: Seed Mast Induced Population Synchrony in the  White-footed Mouse  Peromyscus leucopus

Population SynchronyPopulation Synchrony

Definition: Spatial covariation in population density fluctuations

Measure: Cross-correlation coefficient

(Bjørnstad et al. 1999)

Eample: Soay sheep synchrony by Moran effect (Grenfell et al. 1998)

Page 3: Seed Mast Induced Population Synchrony in the  White-footed Mouse  Peromyscus leucopus

Seed Mast and the Deer Mouse Seed Mast and the Deer Mouse ((Peromyscus sppPeromyscus spp.).)

-Does seed mast induce population synchrony in the deer mouse?

-What demographic processes drive the synchrony?

Ac

orn

s p

er

he

cta

re

(in

th

ou

sa

nd

s)

Nu

mb

er

of

mic

ep

er

10

0 t

rap

pin

gs

(Elias et al. 2004)

Page 4: Seed Mast Induced Population Synchrony in the  White-footed Mouse  Peromyscus leucopus

Model I: direct demographic effectsModel I: direct demographic effects

seed masting

reproduction

adult survivalin situ

recruitmentjuvenilesurvival

recruitment

adultmovement

adult survival

reproduction

juvenilesurvival

in situ recruitment

recruitment

population growth

Page 5: Seed Mast Induced Population Synchrony in the  White-footed Mouse  Peromyscus leucopus

Model II: indirect dispersal effectsModel II: indirect dispersal effects

juveniledispersal

seed masting

reproduction

adult survivalin situ

recruitmentjuvenilesurvival

recruitment

adult survival

reproduction

juvenilesurvival

in situ recruitment

recruitment

population growth

Page 6: Seed Mast Induced Population Synchrony in the  White-footed Mouse  Peromyscus leucopus

Methods I: Mark-recapture and Methods I: Mark-recapture and DemographyDemography

Three annual cycles

Population density (MNA)

Survivorship (MARK)

Reproduction:

percent breeding females

Recruitment:

number juveniles per adult

female

Page 7: Seed Mast Induced Population Synchrony in the  White-footed Mouse  Peromyscus leucopus

Demographic variables estimatedDemographic variables estimated

seed masting juvenile

dispersal

reproduction

adult survival

recruitment

adult survival

reproduction

in situ recruitmentjuvenile

survival

juvenilesurvival

in situ recruitment

recruitment

population growthadult

movement

in situ recruitmentjuvenile

survival

juvenilesurvival

in situ recruitment

Page 8: Seed Mast Induced Population Synchrony in the  White-footed Mouse  Peromyscus leucopus

Methods II: Isotopic Tracing of Adults Methods II: Isotopic Tracing of Adults and Juvenilesand Juveniles

September-October 2003 with a total of 200 pounds of seeds / grid

-3

0

3

6

9

12

-35-30-25-20-15-10

13C

15N

Mixing equation:

Δ xE (‰) = fb x (xEb) + (fm) x (xEm), where (fb + fm) = 1

Page 9: Seed Mast Induced Population Synchrony in the  White-footed Mouse  Peromyscus leucopus

Habitat-specific Patterns in Population Habitat-specific Patterns in Population Synchrony Synchrony

2001-02 2002-03 2003-04

2001-02 2002-03 2003-04

Forest

Field

Cro

ss-c

orr

elat

ion

co

effi

cien

t

Page 10: Seed Mast Induced Population Synchrony in the  White-footed Mouse  Peromyscus leucopus

Annual SurvivalAnnual Survival

*

Page 11: Seed Mast Induced Population Synchrony in the  White-footed Mouse  Peromyscus leucopus

Adult Female ReproductionAdult Female Reproduction

*

*

Page 12: Seed Mast Induced Population Synchrony in the  White-footed Mouse  Peromyscus leucopus

Juvenile RecruitmentJuvenile Recruitment

*

Page 13: Seed Mast Induced Population Synchrony in the  White-footed Mouse  Peromyscus leucopus

Adult Movement vs. Juvenile DispersalAdult Movement vs. Juvenile Dispersal

*

Page 14: Seed Mast Induced Population Synchrony in the  White-footed Mouse  Peromyscus leucopus

Summary: direct versus indirect Summary: direct versus indirect demographic effectsdemographic effects

reproduction

adult survival

recruitment

adult survival

reproduction

in situ recruitmentjuvenile

survival

juvenilesurvival

in situ recruitment

recruitment

population growthseed

mastingadult

movementjuveniledispersal

Page 15: Seed Mast Induced Population Synchrony in the  White-footed Mouse  Peromyscus leucopus

Conclusions Conclusions

Habitat-specific synchrony

- effects of landscape fragmentation on population synchrony

Seed mast induces synchrony mainly through juvenile

dispersal

- meta-population dynamics

- genetic flow between populations

Seed mast and spatial dynamics of consumer populations

- landscape compositions and demographic processes are important

Page 16: Seed Mast Induced Population Synchrony in the  White-footed Mouse  Peromyscus leucopus

AcknowledgementAcknowledgement

Bowers, Michael

Carr, Dave

Morris, Clay

Sparding, Kimberly

Funding:

National Science Foundation

Blandy Experimental Farm,

VA

Kraus, Johanna

Low, Candace

Pedersen, Amy


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