Evolutionary Ecology

, Volume 6, Issue 2, pp 142–151

Departure rules used by bees foraging for nectar: A field test

  • Ronen Kadmon
  • Avi Shmida
Papers

Summary

Departure rules used by solitary long-tongued bees (Anthophora spp. andEucera spp.) collecting nectar from flowers ofAnchusa strigosa (Boraginaceae) were studied. The amount of nectar a bee receives from an individual flower was estimated by measuring the time elapsed since the previous bee visit to that flower. Measurements of nectar accumulation in experimentally emptied flowers indicated that this time interval is an accurate predictor of nectar volumes in flowers. We found that nectar rewards influence the probability of departure from individual plants, as well as distances of movements within plants. The probability of departure from individual plants was negatively related to the amount of reward received at the two lastvisited flowers. This result indicates that the bees used a probabllistic departure rule, rather than a simple threshold departure rule, and that rewards from both the current and the previously visited flower were important in determining departure points. Distances of inter-flower movements within plants were negatively related to the amount of reward received at the current flower. The overall results suggest that the pollinators ofA. strigosa make two types of departure decisions-departures from the whole plant and departures from the neighbourhood of individual flowers-and that they use different departure rules for each scale. Factors influencing the decision-making processes of the observed foraging behaviour are discussed.

Keywords

bees departure rules optimal foraging theory 

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References

  1. Best, L. S. and Bierzychudek, P. (1982) Pollinator foraging on Foxglove (Digitalis purpurea): a test of a new model.Evolution 36, 70–9.Google Scholar
  2. Charnov, E. L. (1976) Optimal foraging: the marginal-value theorem.Theor. Pop. Biol. 9, 129–36.CrossRefGoogle Scholar
  3. Cresswell, J. E. (1990) How and why do nectar-foraging bumblebees initiate movements between inflorescences of wild bergamoMonarda fistulosa (Lamiaceae)?Oecologia 82, 450–60.CrossRefGoogle Scholar
  4. Feinbrun-Dothan, N. (1977)Flora Palestina, Vol. III. The Israel Academy of Sciences and Humanities, Jerusalem.Google Scholar
  5. Hartling, L. K. and Plowright, R. C. (1978) Foraging by bumble bees on patches of artificial flowers: a laboratory study.Can. J. Bot. 63, 488–91.Google Scholar
  6. Heinrich, B. (1979) Resource heterogeneity and patterns of movement in foraging bumble bees.Oecologia 40, 235–46.CrossRefGoogle Scholar
  7. Hodges, C. M. (1981) Optimal foraging in bumblebees: hunting by expectation.Anim. Behav. 29, 1166–71.Google Scholar
  8. Hodges, C. M. (1985) Bumblebees foraging: the threshold departure rule.Ecology 66, 179–87.Google Scholar
  9. Kadmon, R., Shmida, A. and Selten, R. (1992) Within-plant foraging behavior of bees and its relation to nectar distribution inAnchusa strigosa. Isr. J. Bot. (in press).Google Scholar
  10. Maynard Smith, J. (1978) Optimization theory in evolution.Ann. Rev. Ecol. Systematics 9, 31–56.CrossRefGoogle Scholar
  11. McNamara, J. and Houston A. (1980) The application of statistical decision theory to animal behavior.J. Theor. Biol. 85, 673–90.CrossRefPubMedGoogle Scholar
  12. Ollason, J. G. (1980) Learning to forage-optimally?Theor. Pop. Biol. 18, 44–56.CrossRefGoogle Scholar
  13. Pleasants, J. M. (1989) Optimal foraging by nectarivores: a test of the marginal-value theorem.Am. Nat. 134, 51–71.CrossRefGoogle Scholar
  14. Pyke, G. H. (1978) Optimal foraging: movement patterns of bumblebees between inflorescenses.Theor. Pop. Biol. 13, 72–98.CrossRefGoogle Scholar
  15. Shmida, A. and Ellner, S. (1984) Coexistence of plant species with similar niches.Vegetatio 58, 20–55.Google Scholar
  16. Shmida, A. and Kadmon, R. (1991) Within-plant patchiness in nectar distribution inAnchusa strigosa.Vegetatio 94, 95–9.CrossRefGoogle Scholar
  17. Stephens, D. W. and Krebs, J. R. (1986)Foraging Theory. Princeton University Press, Princeton, NJ, USA.Google Scholar
  18. Waddington, K. D. (1980) Flight patterns of foraging bees relative to density of artificial flowers and distribution of nectar.Oecologia 44, 199–204.CrossRefGoogle Scholar
  19. Waddington, K. D. (1981) Factors influencing pollen flow in bumblebee-pollinatedDelphinium virescens.Oikos 37, 153–9.Google Scholar
  20. Zimmerman, M. (1982) The effect of nectar production on neighborhood size.Oecologia 52, 104–108.CrossRefGoogle Scholar
  21. Zimmerman, M. (1983) Plant reproduction and optimal foraging: experimental nectar manipulations inDelphinium nelsonii.Oikos 41, 57–63.Google Scholar
  22. Zimmerman, M. and Cook, S. (1986) Pollinator foraging, experimental nectar robbing and plant fitness inImpatiens capensis.Am. Midland Nat. 113, 84–91.Google Scholar
  23. Zimmerman, M. and Pyke, G. H. (1986) Reproduction inPolemonium: patterns and implications of floral nectar production and standing crops.Am. J. Bot. 73, 1405–15.Google Scholar

Copyright information

© Chapman & Hall 1992

Authors and Affiliations

  • Ronen Kadmon
    • 1
  • Avi Shmida
    • 1
  1. 1.Department of Botany, Institute of Life SciencesThe Hebrew UniversityJerusalemIsrael

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