Journal of Biosciences

, Volume 19, Issue 4, pp 369–380 | Cite as

Non-random foraging in certain bird pests of field crops

  • S. Subramanya


Two systems of bird-crop interactions were studied to explain the between- and the within-field variation in the foraging pattern of bird pests in agro-ecosystems. Weaverbirds and munias select rice fields with greater vegetation complexity and not based on the resource status. Within a selected area the concentration of feeding birds was greater close to vegetation cover and decreased non-linearly with increase in distance. Certain structural features and earhead characters of rice plants predisposed particular varieties for intense grain predation by birds. In the parakeet-sunflower system the extent of damage among plants within a field was closely linked to the foraging pattern of parakeets. The extent of achene predation by parakeets was influenced by certain structural features of sunflower plants and not the resource load of each plant. Selective feeding on sunflower plants was governed by the predator vigilance pattern; parakeets prefer to feed on plants that offered better field of vision. The results suggest that the observed pattern of foraging by bird pests in agro-ecosystems is non-random and is dependent on factors favouring predator avoidance behaviour and not on resource maximization.


Argo-ecosystems bird pests foraging pattern plant structure predator avoidance 


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  1. Ali S and Ripley S D 1984Handbook of the birds of India and Pakistan Compact edition (Delhi: Oxford Univ. Press)Google Scholar
  2. Babu R S and Muthukrishnan T S 1987 Studies on the damage ofPsiltacula krameri (Scopoli) andPasser domesticus (Linnaeus) on certain crops;Trop. Pest. Manage. 33 367–369CrossRefGoogle Scholar
  3. Bertram B C R 1980 Vigilance and group size in ostriches;Anim. Behav. 28 278–286CrossRefGoogle Scholar
  4. Besser J F 1978 Birds and sunflower; inSunflower science and technology (ed.) J F Carter (Madison, Wisconsin: American Society of Agronomy) pp 263–277Google Scholar
  5. Bhatnagar R K, Sarup P K N, Mehrotra K N, Raizado M, Marwaha K, Panwara V P S and Siddiqui K H 1982 Bird damage to maize cobs: Relationship between susceptibility of maize germplasms and spathe configuration; inProceedings of the seminars on management of problem birds in aviation and agriculture (eds) R A Agarwal and R K Bhatnagar (New Delhi: IARI) pp 233–234Google Scholar
  6. Diamond S and Lazarus J 1974 The problem of vigilance in animal life;Brain Behav. Evol. 9 60–69Google Scholar
  7. Dickson J G 1979 Seasonal population of insectivorous birds in a mature bottomland Hardwood forest south Louisiana; inThe role of insectivorous birds in forest ecosystems (eds) J C Dickson, R N Connor, R R Fleet, J A Jackson and J C Kroll (New York: Academic Press) pp 26I-268Google Scholar
  8. Dolbeer R A 1975 A comparison of two methods for estimating bird damage to sunflower;J. Wildl. Manage. 39 802–806CrossRefGoogle Scholar
  9. Dyer M I and Ward P 1977 Management of pest situations; inGranivorous birds in ecosystems (eds) J Pinowski and S C Kendeigh (Cambridge: Cambridge Univ. Press) pp 267–300Google Scholar
  10. Grist D H and Lever R J A W 1969Pests of rice (London: Longman)Google Scholar
  11. Kendeigh S C 1975Ecology with special reference to animals and man (New Jersey: Prentice-Hall)Google Scholar
  12. Mathew D N 1976 Ecology of weaverbirds;J. Bombay Nat. Hist. Soc. 72 204–206Google Scholar
  13. Mehrotra K N and Bhatnagar R K 1979Status of economic ornithology in India (New Delhi, India: ICAR)Google Scholar
  14. Metcalf N B 1984 The effect of habitat on the vigilance of shorebirds: Is visibility important?;Anim. Behav. 32 10–42Google Scholar
  15. Morse D H 1973 Interaction between tit flocks and sparrowhawks (Accipiter nisus);Ibis 115 591–593Google Scholar
  16. Murton R K and Jones 1973 The ecology and economics of damage to Brassicae by wood-pigeonsColumbapalumbus;Ann. Appl. Biol. 75 I07–122CrossRefGoogle Scholar
  17. Murton R K and Wright E N I968The problem of birds as pests (London: Academic Press)Google Scholar
  18. Nakamara K and Matsuoka S I991 Food resource utilization of the rufous turtle dove (Streptopelia orientalis) in cultivated fields; inNestling mortality of granivorous birds due to microorganisms and toxic substances (eds) J Pinowski, B P Kavanagh and W Gorski (Warsaw: Polish Scientific Publishers) pp 61–69Google Scholar
  19. O’Conner R J and Shrubb M 1986Farming and birds (Cambridge: Cambridge Univ. Press)Google Scholar
  20. Perrins A. M and Birkhead 1983Avian ecology (London: Blackie)Google Scholar
  21. Pinowski J and Kendeigh S C 1977Granivorous birds in ecosystems (London: Cambridge Univ. Press)Google Scholar
  22. Pulliam H R 1973 On the advantages of flocking;J. Theor. Biol. 38 419–422PubMedCrossRefGoogle Scholar
  23. Pulliam H R and Mills G S 1977 The use of space by sparrows;Ecology 58 1393-I399CrossRefGoogle Scholar
  24. Pulliam H R, Pyke G H and Coraco T 1982 The scanning behaviour of Juncos: a game theoretical approach;J. Theor. Biol. 95 89–103CrossRefGoogle Scholar
  25. Price P W 1975Insect ecology (New York: John Wiley)Google Scholar
  26. Rudebeck G 1951 The choice of prey and modes of hunting of predatory birds with special reference to their selective effect;Oikos 3 200–23ICrossRefGoogle Scholar
  27. Southwood T R E I978Ecological methods (London: Chapman Hall)Google Scholar
  28. Stone A. P and Mott D F 1973 Bird damage to ripening field corn in the United States, 1971;US Dept. Interior Fish Wildlife Serv. Leaflet 505 1–8Google Scholar
  29. Subramanya S 1991Studies on birds of rice fields with special reference to certain pest species, Ph D thesis, University of Agricultural Sciences, BangaloreGoogle Scholar
  30. Sundararaj N S, Nagaraju M N, Venkataramu and Jagannath M K I972Design analysis of experiments (Bangalore: Univ. Agric. Sci.)Google Scholar
  31. Treisman M I975 Predation and the evolution of gregariousness. I. Model for concealment and evasion;Anim. Behav. 23 801–825CrossRefGoogle Scholar
  32. Weatherhead P J and Tinker S H 1982 Maize ear characteristics affecting vulnerability to damage by redwinged blackbirds;Prot. Ecol. 5 167–175Google Scholar
  33. Ward P 1965 Feeding ecology of the black-faced diochQuelea quelea in Nigeria;Ibis 107 I73–2I4Google Scholar
  34. Wiens J A I976 Population responses to patchy environments;Annu. Rev. Ecol. Syst. 7 81-I20CrossRefGoogle Scholar
  35. Wiens J A and Dyer M I I977 Assessing potential impact of granivorous birds in ecosystems; inGranivorous birds in ecosystems (eds) J Pinowski and S C Kendeigh (London: Cambridge Univ. Press) pp 205–268Google Scholar
  36. Weins J A and Johnson R F 1977 Adaptive correlates of granivory in birds; inGranivorous birds in ecosystems (eds) J Pinowski and S C Kendeigh (London: Cambridge Univ. Press) pp 301–340Google Scholar
  37. Wright E N, Inglis I R and Feare A. J 1980Bird problems in agriculture (Croydon: British Crop Prot. Council)Google Scholar

Copyright information

© Indian Academy of Sciences 1994

Authors and Affiliations

  • S. Subramanya
    • 1
  1. 1.HPHT Scheme, ‘J’ BlockUniversity of Agricultural Sciences, GKVICBangaloreIndia

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