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Ecological determinants of foraging efficiency:
insights from the group foraging bat
Molossus molossus
Yann GAGER
Adapted from [Cvikel et al. 2015]
Information transfer about food
Information transfer about food
Adapted from [Cvikel et al. 2015]
Information transfer about food
[Dechmann et al. 2010]
Social foraging
confirmed by telemetry,
37 mins foraging time
Optimal group size for foraging efficiency?
Group size
Foraging
efficiency
Improved prey detection
Inspired from [Cvikel e...
Group size
Foraging
efficiency
Improved prey detection conspecific interference
Optimal group size for foraging efficiency...
Small harems of stable size
[81 captures – 14 social groups]
Adultgroupsize
Roost identity
Recruitment
of juveniles
disper...
Automated data collection:
transponder reader + scale
Reader data from one adult of each sex
SunriseSunset
Typical female:
foraging (x̄ = 38 mins)
Reader data from one adult of each sex
Typical female:
foraging (x̄ = 38 mins)
Typical male:
foraging (x̄ = 32 mins)
+ roo...
Mass data for one femaleMass(g)
Month of the year
Mass data for one femaleMass(g)
Month of the year
Emergence
Return
Mass data for one female
Birth
Pregnancy
Mass(g)
Month of the year
Modelling mass data
for after-sunset period
- 5 social groups with group size manipulation
- Evening foraging period [suns...
Modelling mass data
for after-sunset period
- 5 social groups with group size manipulation
- Evening foraging period [suns...
Modelling mass data
for after-sunset period
Linear mixed-effect models
- Response variable: Mass
- Fixed predictor variabl...
Important predictor variables for mass
>
Sex
[Female-defense polygyny]
Important predictor variables for mass
>
Sex
[Female-defense polygyny]
Time
[Sunset: 3 h after sunset]
Important predictor variables for mass
>
Sex
[Female-defense polygyny]
Rain & wind speed
[Effect on foraging]
Time
[Sunset...
Important predictor variables for mass
>
Sex
[Female-defense polygyny]
Rain & wind speed
[Effect on foraging]
Time
[Sunset...
Mass gain over 3 h ~ group size
Massgain(g)over3h
Group size
Mass gain over 3 h ~ group size
95%
Credibility
Interval
Group size
Massgain(g)over3h
A cooperative piece of work
yanngager.weebly.com
Fitness ~ group size
Higashi~1993
Compromise
Stable
Optimal
Mass variation: the Linear Mixed-Effect model
What are the multiple benefits of bat sociality?
Predator avoidance
Food sharing
Social thermoregulation
Information trans...
Ecological determinants of foraging efficiency: insights from the group foraging bat Molossus molossus
Ecological determinants of foraging efficiency: insights from the group foraging bat Molossus molossus
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Ecological determinants of foraging efficiency: insights from the group foraging bat Molossus molossus

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Ecology & Behaviour 2015 - Toulouse (France)
17-21 mai 2015

Published in: Science
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Ecological determinants of foraging efficiency: insights from the group foraging bat Molossus molossus

  1. 1. Ecological determinants of foraging efficiency: insights from the group foraging bat Molossus molossus Yann GAGER
  2. 2. Adapted from [Cvikel et al. 2015] Information transfer about food
  3. 3. Information transfer about food Adapted from [Cvikel et al. 2015]
  4. 4. Information transfer about food [Dechmann et al. 2010] Social foraging confirmed by telemetry, 37 mins foraging time
  5. 5. Optimal group size for foraging efficiency? Group size Foraging efficiency Improved prey detection Inspired from [Cvikel et al. 2015]
  6. 6. Group size Foraging efficiency Improved prey detection conspecific interference Optimal group size for foraging efficiency? Inspired from [Cvikel et al. 2015]
  7. 7. Small harems of stable size [81 captures – 14 social groups] Adultgroupsize Roost identity Recruitment of juveniles dispersing Death of group members + -
  8. 8. Automated data collection: transponder reader + scale
  9. 9. Reader data from one adult of each sex SunriseSunset Typical female: foraging (x̄ = 38 mins)
  10. 10. Reader data from one adult of each sex Typical female: foraging (x̄ = 38 mins) Typical male: foraging (x̄ = 32 mins) + roost guarding SunriseSunset
  11. 11. Mass data for one femaleMass(g) Month of the year
  12. 12. Mass data for one femaleMass(g) Month of the year Emergence Return
  13. 13. Mass data for one female Birth Pregnancy Mass(g) Month of the year
  14. 14. Modelling mass data for after-sunset period - 5 social groups with group size manipulation - Evening foraging period [sunset: 3 h after sunset] - 37 days, 73 individuals, 8681 mass points The automated dataset of mass
  15. 15. Modelling mass data for after-sunset period - 5 social groups with group size manipulation - Evening foraging period [sunset: 3 h after sunset] - 37 days, 73 individuals, 8681 mass points The automated dataset of mass Day 1 Day 6 Day 11 Day 15 Natural size (100%) Artificial size (50-75%) Natural size (100%)
  16. 16. Modelling mass data for after-sunset period Linear mixed-effect models - Response variable: Mass - Fixed predictor variables (sex, group size, day, time, weather [rain, wind speed, temp., moon]) - Random effect variables (transponder, roost) - 5 social groups with group size manipulation - Evening foraging period [sunset: 3 h after sunset] - 37 days, 73 individuals, 8681 mass points The automated dataset of mass
  17. 17. Important predictor variables for mass > Sex [Female-defense polygyny]
  18. 18. Important predictor variables for mass > Sex [Female-defense polygyny] Time [Sunset: 3 h after sunset]
  19. 19. Important predictor variables for mass > Sex [Female-defense polygyny] Rain & wind speed [Effect on foraging] Time [Sunset: 3 h after sunset]
  20. 20. Important predictor variables for mass > Sex [Female-defense polygyny] Rain & wind speed [Effect on foraging] Time [Sunset: 3 h after sunset] Group size [Optimal for mass gain]
  21. 21. Mass gain over 3 h ~ group size Massgain(g)over3h Group size
  22. 22. Mass gain over 3 h ~ group size 95% Credibility Interval Group size Massgain(g)over3h
  23. 23. A cooperative piece of work
  24. 24. yanngager.weebly.com
  25. 25. Fitness ~ group size Higashi~1993 Compromise Stable Optimal
  26. 26. Mass variation: the Linear Mixed-Effect model
  27. 27. What are the multiple benefits of bat sociality? Predator avoidance Food sharing Social thermoregulation Information transfer about food

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