Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.
Evolution of group living:
insights from a social foraging bat
Dina Dechmann
Teague O’Mara
Rachel Page’s lab
Olivier Gimen...
True sociality:
Persistence in associations
between individuals
in space and time
[Lee 1994]
[Van Schaik & VanHoof 1983]
[Schult et al. 2001]
Multiple
Convergent
evolution
of sociality
e.g. Primates
Ecological drivers
of sociality
Predators
Temperature Roost
Food
Spatial and temporal food constraints
Spatial Temporal
Sunrise Sunset
Time
Social foraging & information transfer
[Safi & Kerth 2007]
Social foraging
in bats
=
+
Feeding buzzes (cues)
Solitary
=
Echoes up to 5m
Group
=
Eavesdropping up
to 50 m
Numerous benefits and costs
of group living
Fitness ~ Group size
[Van Schaik & VanHoof 1983]
How does group size affect fitness components?
Group size
Fitness
Foraging efficiency ~ Group size?
Group size
Foraging
efficiency
[Beauchamp 1998]
Group size
Survival
[Beauchamp 1998]
Survival ~ group size ?
How does group size affect fitness components?
Survival?
Foraging
efficiency?
Group size
The social bat
M. molossus
Total size of social groups
Adult size of social groups
Sunset
Sunrise
Morning
foraging
period
Evening
foraging
period
A narrow ecological niche
[Dechmann et al. 2010]
Two energetic strategies
Group
foraging
Lowered
metabolism
[Dechmann et al. 2011]
Weight at retur
Weight at
emergence
The mass data
Foraging efficiency ~ group size
5 social groups
with automated recorders
Artificial group size
manipulation
Linear Mixed-...
Mass variation over foraging period
- Linear model with Mixed-effects
- Ecological + genetic data
- Polynomial function fo...
Model: Quadratic function of group size (+ 95% CrI )
Survival ~ group size
201 recaptures of 126 adult females of 14 social groups
Survival ~ group size
No influence of group size on survival
Continuous monitoring of 63 marked adult females from 4 socia...
Survival ~ group size
Transitions between group size
Continuous monitoring of 63 marked adult females from 4 social groups
Main results
Foraging efficiency ~ GS
Survival ~ GS
Fitness components ~ group size:
Various patterns!
PhD Milestones
Next months:
- Write foraging efficiency chapter
- Analyses on reproductive success
- Analyses on emergence...
@Bat_Yann
chiroblog.com
Evolution of group living: insights from a social foraging bat
Upcoming SlideShare
Loading in …5
×

Evolution of group living: insights from a social foraging bat

486 views

Published on

Séminaire ISEM - Montpellier (France)
15 Décembre 2014

Published in: Science
  • Be the first to comment

  • Be the first to like this

Evolution of group living: insights from a social foraging bat

  1. 1. Evolution of group living: insights from a social foraging bat Dina Dechmann Teague O’Mara Rachel Page’s lab Olivier Gimenez Stephen Rossiter’s lab Yann GAGER
  2. 2. True sociality: Persistence in associations between individuals in space and time [Lee 1994]
  3. 3. [Van Schaik & VanHoof 1983]
  4. 4. [Schult et al. 2001] Multiple Convergent evolution of sociality e.g. Primates
  5. 5. Ecological drivers of sociality Predators Temperature Roost Food
  6. 6. Spatial and temporal food constraints Spatial Temporal Sunrise Sunset Time
  7. 7. Social foraging & information transfer
  8. 8. [Safi & Kerth 2007] Social foraging in bats = +
  9. 9. Feeding buzzes (cues) Solitary = Echoes up to 5m Group = Eavesdropping up to 50 m
  10. 10. Numerous benefits and costs of group living Fitness ~ Group size [Van Schaik & VanHoof 1983]
  11. 11. How does group size affect fitness components? Group size Fitness
  12. 12. Foraging efficiency ~ Group size? Group size Foraging efficiency [Beauchamp 1998]
  13. 13. Group size Survival [Beauchamp 1998] Survival ~ group size ?
  14. 14. How does group size affect fitness components? Survival? Foraging efficiency? Group size
  15. 15. The social bat M. molossus
  16. 16. Total size of social groups
  17. 17. Adult size of social groups
  18. 18. Sunset Sunrise Morning foraging period Evening foraging period A narrow ecological niche
  19. 19. [Dechmann et al. 2010] Two energetic strategies Group foraging Lowered metabolism [Dechmann et al. 2011]
  20. 20. Weight at retur Weight at emergence The mass data
  21. 21. Foraging efficiency ~ group size 5 social groups with automated recorders Artificial group size manipulation Linear Mixed-Effect Model + Bayesian simulations Molecular ecology 78 marked individuals 20 to 50% of individuals kept in captivity Fixed + Random effects 5000 simulations Up to 18 microsatellites for most individuals
  22. 22. Mass variation over foraging period - Linear model with Mixed-effects - Ecological + genetic data - Polynomial function for group size - Interactions with time
  23. 23. Model: Quadratic function of group size (+ 95% CrI )
  24. 24. Survival ~ group size 201 recaptures of 126 adult females of 14 social groups
  25. 25. Survival ~ group size No influence of group size on survival Continuous monitoring of 63 marked adult females from 4 social groups
  26. 26. Survival ~ group size Transitions between group size Continuous monitoring of 63 marked adult females from 4 social groups
  27. 27. Main results Foraging efficiency ~ GS Survival ~ GS Fitness components ~ group size: Various patterns!
  28. 28. PhD Milestones Next months: - Write foraging efficiency chapter - Analyses on reproductive success - Analyses on emergence order December 2015: PhD defense (Konstanz) Next weeks: - Submit survival chapter - Finish microsatellite note
  29. 29. @Bat_Yann chiroblog.com

×