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Aerial surveillance by a generalist seed predator: food resource tracking by Meyer's parrot Poicephalus meyeri in the Okavango Delta, Botswana

Published online by Cambridge University Press:  28 May 2010

Rutledge S. Boyes  and
Michael R. Perrin
Rutledge S. Boyes*
Affiliation:
DST/NRF Centre of Excellence, Percy FitzPatrick Institute of African Ornithology, University of Cape Town, Rondebosch, 7701, Cape Town, South Africa
Michael R. Perrin
Affiliation:
Research Centre for African Parrot Conservation, School of Biological and Conservation Sciences, University of KwaZulu-Natal, P/Bag X01, Scottsville, 3209, KwaZulu-Natal, South Africa
*
1Corresponding author. Email: [email protected]
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Abstract:

As a proven food resource generalist, Meyer's parrot (Poicephalus meyeri) was expected to track the availability of all significant food resources in its diet over time. Here we recorded all feeding activity during 366 standardized road transects for correlation with an index of relative food resource abundance over 18 mo. As expected, Meyer's parrot made food resource decisions according to relative abundance at landscape level. Feeding activity on food resources available throughout the year (e.g. ripe Kigelia africana fruit) or not visible from the air (e.g. unripe Diospyros lycoides fruit), however, did not correlate significantly with fluctuations in their relative resource abundance. In addition, over 70% of all feeding bouts were in the high canopy and over 70% of all food items consumed formed bi-coloured displays. The influence of estimated protein and energy acquisition rates from different food resources was insignificant. Therefore, important selection criteria for utilization by Meyer's parrot include relative abundance and visibility from the air (i.e. food resources with the highest probability of encounter when dispersing from a central roost). Sensitivity to fluctuations in resource abundance at landscape level demonstrates the relative importance of maximizing net gain per unit foraging time by minimizing foraging flight distance.

Keywords

Africabirdsforest habitatfruiting phenologyniche breadthsubtropics
Type
Research Article
Information
Journal of Tropical Ecology , Volume 26 , Issue 4 , July 2010 , pp. 381 - 392
Copyright
Copyright © Cambridge University Press 2010

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References

LITERATURE CITED

ARRUDA, R., RODRIGUES, D. J. & IZZO, T. J. 2008. Rapid assessment of fruit-color selection by birds using artificial fruits at local scale in Central Amazonia. Acta Amazonica 38:291–296.CrossRefGoogle Scholar
BOYES, R. S. 2009. The ecology of Meyer's parrot Poicephalus meyeri in the Okavango Delta, Botswana. PhD thesis. University of KwaZulu-Natal, South Africa.CrossRefGoogle Scholar
BOYES, R. S. & PERRIN, M. R. 2009a. Generalists, specialists and opportunists: niche metrics of Poicephalus parrots in southern Africa. Ostrich 80:93–97.CrossRefGoogle Scholar
BOYES, R. S. & PERRIN, M. R. 2009b. Do Meyer's parrots Poicephalus meyeri benefit pollination and seed dispersal of plants in the Okavango Delta, Botswana? African Journal of Ecology. DOI: 10.1111/j.1365-2028.2009.01177.xCrossRefGoogle Scholar
BOYES, R. S. & PERRIN, M. R. 2009c. Flocking dynamics and roosting behaviour of the Meyer's parrot, Poicephalus meyeri, in the Okavango Delta, Botswana. African Zoology 44:181–193.Google Scholar
BOYES, R. S. & PERRIN, M. R. 2009d. Feeding ecology of Meyer's parrot Poicephalus meyeri in the Okavango Delta, Botswana. Ostrich 80:153–164.CrossRefGoogle Scholar
BOYES, R. S. & PERRIN, M. R. 2010. Patterns of daily activity of Meyer's parrot Poicephalus meyeri in the Okavango Delta, Botswana. Emu 110: 54–65.CrossRefGoogle Scholar
BURNS, K. C. & DALEN, J. L. 2002. Foliage color contrasts and adaptive fruit color variation in a bird-dispersed plant community. Oikos 96:463–469.CrossRefGoogle Scholar
CACCAMISE, D. F. & MORRISON, D. W. 1986. Avian communal roosting: implications of diurnal activity centers. American Naturalist 128:191–198.CrossRefGoogle Scholar
CARLSON, A. & MORENO, J. 1992. Cost of short flights in the Willow Tit measured with double-labeled water. Auk 109:389–393.CrossRefGoogle Scholar
CASAGRANDE, D. G. & BEISSINGER, S. R. 1997. Evaluation of four methods of estimating parrot population size. Condor 99:445–457.CrossRefGoogle Scholar
CHAPMAN, C. A., CHAPMAN, L. J., WRANGHAM, R., HUNT, K., GEBO, D. & GARDNER, L. 1992. Estimators of fruit abundance of tropical trees. Biotropica 24:527–531.CrossRefGoogle Scholar
CHAPMAN, C. A., CHAPMAN, L. J. & WRANGHAM, R. 1993. Observations on the feeding biology and population ecology of Grey Parrot Psittacus erithacus. Scopus 16:89–93.Google Scholar
CHAPMAN, C. A., WRANGHAM, R. & CHAPMAN, L. J. 1994. Indices of habitat-wide fruit abundance in tropical forest. Biotropica 26:160–171.CrossRefGoogle Scholar
COLWELL, R. K. & FUTUYMA, D. J. 1971. On the measurement of niche breadth and overlap. Ecology 52:567–576.CrossRefGoogle ScholarPubMed
DUMONT, E. R. 1999. The effect of food hardness on feeding behaviour in frugivorous bats (Phyllostomidae): an experimental study. Journal of Zoology, London 248:219–229.CrossRefGoogle Scholar
ELLERY, K. & ELLERY, W. N. 1997. Plants of the Okavango Delta: a field guide. Tsaro Publishing, Durban. 280 pp.Google Scholar
ELLERY, W. N., MCCARTHY, T. S. & DANGERFIELD, J. M. 2000. Floristic diversity in the Okavango Delta, Botswana, as an endogenous product of biological activity. Pp. 195–225 in Gopal, B., Junk, W. J. & Davis, J. A. (eds.). Biodiversity in wetlands: assessment, function and conservation, Volume 1. Backhuys Publishers, Leiden.Google Scholar
ELLERY, W. N., MCCARTHY, T. S. & SMITH, N. D. 2003. Vegetation, hydrology and sedimentation patterns on the main distributary system of the Okavango Fan, Botswana. Wetlands 23:357–375.CrossRefGoogle Scholar
FLINT, E. N. & NAGY, K. A. 1984. Flight energetics of free-living Sooty Terns. Auk 101:288–294.CrossRefGoogle Scholar
FORSHAW, J. M. 1989. Parrots of the World. (Third revised edition). Willoughby, Lansdowne Editions, Melbourne. 570 pp.Google Scholar
GALETTI, M. 1993. Diet of the Scaly-headed Parrot Pionus maximiliani in a semi-deciduous forest in southeastern Brazil. Biotropica 25: 419–425.CrossRefGoogle Scholar
GARCIA, D. & ORTIZ-PULIDO, R. 2004. Patterns of resource tracking by avian frugivores at multiple spatial scales: two case studies on discordance among scales. Ecography 27:187–196.CrossRefGoogle Scholar
GAUTIER-HION, A. & MICHAULOUD, G. 1989. Are figs always keystone resources for tropical frugivorous vertebrates? A test in Gabon. Ecology 70:1826–1833.CrossRefGoogle Scholar
GREG-SMITH, P. W. 1986. Bi-colored fruit displays and frugivorous birds: the importance of fruit quality to dispersers and seed predators. American Naturalist 127:246–251.CrossRefGoogle Scholar
GUMBRICHT, T., MCCARTHY, T. S. & MERRY, C. L. 2001. The topography of the Okavango Delta, Botswana, and its tectonic and sedimentological implications. South African Journal of Geology 104:242–264.CrossRefGoogle Scholar
HEGDE, S. G., GANESHAIAH, K. N. & SHAANKER, U. 1991. Fruit preference criteria by avian frugivores: their implications for the evolution of clutch size in Solanum pubescens. Oikos 60:20–26.CrossRefGoogle Scholar
HELRICH, K. 1990. Official methods of analysis: agricultural chemicals, contaminants and drugs. Association of Analytical Chemists, Inc. Arlington.Google Scholar
HURLBERT, S. H. 1978. The measurement of niche overlap and some relatives. Ecology 59:67–77.CrossRefGoogle Scholar
JOHNSON, R. A., WILLSON, M. F., THOMPSON, J. N. & BERTIN, R. I. 1985. Nutritional values of wild fruits and consumption by migrant frugivorous birds. Ecology 66:819–827.CrossRefGoogle Scholar
JUNIPER, T. & PARR, M. 1998. Parrots – A guide to the parrots of the World. Pica Press, Robertsbridge. 584 pp.Google Scholar
KOEN, J. H. 1992. Medium-term fluctuations of birds and their potential food resources in the Knysna forest. Ostrich 63:21–30.CrossRefGoogle Scholar
LEHOUCK, V., SPANHOVE, T., VANGESTEL, C., CORDEIRO, N. J. & LENS, L. 2009. Does landscape structure affect resource tracking by avian frugivores in a fragmented Afrotropical forest? Ecography 32:789–799.CrossRefGoogle Scholar
MALIZIA, L. R. 2001. Seasonal fluctuations of birds, fruits, and flowers in a subtropical forest of Argentina. Condor 103:45–61.CrossRefGoogle Scholar
MELLO, M. A. R., LEINER, N. O., GUIMAIRAES, P. R. & JORDANO, P. 2005. Size-based fruit selection of Calophyllum brasiliense (Clusiaceae) by bats of the genus Artibeus (Phyllostomidae) in the Restinga area, southeastern Brazil. Acta Chiropterologica 7:179–182.CrossRefGoogle Scholar
MOEGENBURG, S. S. & LEVEY, D. J. 2003. Do frugivores respond to fruit harvest? An experimental study of short-term responses. Ecology 84:2600–2612.CrossRefGoogle Scholar
NDITHIA, H. & PERRIN, M. R. 2006. Diet and foraging behaviour of the Rosy-faced Lovebird Agapornis roseicollis in Namibia. Ostrich 77:45–51.CrossRefGoogle Scholar
PALGRAVE, K. C. 2002. Trees of Southern Africa. Struik Publishers, Cape Town. 959 pp.Google Scholar
PERRIN, M. R., MCGOWAN, P., DOWNS, C. T., SYMES, C. T. & WARBURTON, L. S. 2002. Overview. Africa. Pp. 87–112 in Snyder, N., McGowan, P., Gilardi, J. & Grajal, A. (eds.) Parrots. Status, survey and Conservation Action Plan 2000–2004. IUCN, Gland.Google Scholar
QUINN, G. P. & KEOUGH, M. J. 2002. Experimental design and data analysis for biologists. Cambridge University Press, Cambridge. 623 pp.CrossRefGoogle Scholar
RAKOTOMANANA, H. & HINO, T. 1998. Fruit preferences of Velvet Asity Philepitta castanea in a rainforest of Madagascar. Japanese Journal of Ornithology 47:11–19.CrossRefGoogle Scholar
RENTON, K. 2001. Lilac-crowned parrot diet and food resource availability: resource tracking by a parrot seed predator. Condor 103:62–69.CrossRefGoogle Scholar
ROBINET, O., BRETAGNOLLE, V. & CLOUT, M. 2003. Activity patterns, habitat use, foraging behaviour and food selection of the Ouvea Parakeet Eunymphicus cornutus uvaeensis. Emu 103:71–80.CrossRefGoogle Scholar
ROODT, V. 1998. Trees and shrubs of the Okavango Delta: medicinal uses and nutritional value. Shell Oil Botswana, Gaborone. 187 pp.Google Scholar
ROWAN, M. K. 1983. The doves, parrots, louries and cuckoos of Southern Africa. David Philip, Cape Town. 429 pp.Google Scholar
SCHMIDT, V., SCHAEFER, H. M. & WINKLER, H. 2004. Conspicuousness, not colour as foraging cue in plant-animal signaling. Oikos 106:551–557.CrossRefGoogle Scholar
SELMAN, R. G., HUNTER, M. L. & PERRIN, M. R. 2002. The feeding ecology of Rüppell's Parrot Poicephalus rueppellii in Namibia. Ostrich 73:127–134.CrossRefGoogle Scholar
SIH, A. & CHRISTENSEN, B. 2001. Optimal diet theory: when does it work, and when and why does it fail? Animal Behaviour 61:379–390.CrossRefGoogle Scholar
SNOW, D. W. (ed.) 1978. An atlas of speciation in African non-passerine birds. British Museum (Natural History), London. 564 pp.Google Scholar
SORENSON, A. E. 1983. Taste aversion and frugivores preference. Oecologia 56:117–120.CrossRefGoogle Scholar
SYMES, C. T. & PERRIN, M. R. 2003a. The feeding biology of the Greyheaded Parrot Poicephalus fuscicollis suahelicus (Reichenow), in Northern Province, South Africa. Emu 103:49–58.CrossRefGoogle Scholar
SYMES, C. T. & PERRIN, M. R. 2003b. Daily flight activity and flocking behaviour patterns of the Grey-headed Parrot Poicephalus fuscicollis suahelicus Reichenow 1898 in Northern Province, South Africa. Tropical Zoology 16:47–62.CrossRefGoogle Scholar
TATNER, P. & BRYANT, D. M. 1986. Flight cost of a small passerine measured using doubly labeled water: implications for energetics studies. Auk 103:169–180.Google Scholar
TAYLOR, S. 2002. On the behavioural ecology and vocal communication of the Brown-headed Parrot Poicephalus cryptoxanthus. Ph.D. Thesis, University of KwaZulu-Natal, Pietermaritzburg, South Africa.Google Scholar
TAYLOR, S. & PERRIN, M. R. 2006. The diet of the Brown-headed Parrot Poicephalus cryptoxanthus in the wild in southern Africa. Ostrich 77:179–185.CrossRefGoogle Scholar
TELLERIA, J. L. & PEREZ-TRIS, J. 2007. Habitat effects on resource tracking ability: do wintering blackcaps Sylvia atricapilla track fruit availability? Ibis 149:18–25.CrossRefGoogle Scholar
VAN WYK, B. & VAN WYK, P. 1997. Field guide to trees of Southern Africa. Struik Publishers, Pretoria. 489 pp.Google Scholar
WARBURTON, L. S. & PERRIN, M. R. 2005. Foraging behaviour and feeding ecology of the Black-cheeked Lovebird Agapornis nigrigenis in Zambia. Ostrich 76:118–130.CrossRefGoogle Scholar
WENNY, D. G. 2003. Short-term fruit removal from a neotropical shrub with experimental bi-coloured displays. Journal of Tropical Ecology 19:469–472.CrossRefGoogle Scholar
WHEELWRIGHT, N. T. 1985. Fruit size, gape width and the diets of fruit-eating birds. Ecology 66:808–818.CrossRefGoogle Scholar
WHEELWRIGHT, N. T. & JANSON, C. H. 1985. Color of fruit displays of bird-dispersed plants in two tropical forests. American Naturalist 126:777–799.CrossRefGoogle Scholar
WHITNEY, K. D. 2005. Linking frugivores to the dynamics of a fruit color polymorphism. American Journal of Botany 92:859–867.CrossRefGoogle Scholar
WILLSON, M. F. & WHELAN, C. J. 1990. Evolution of fruit color in fleshy-fruited plants. American Naturalist 136:790–809.CrossRefGoogle Scholar
WILLSON, M. F., GRAFF, D. A. & WHELAN, C. J. 1990. Color preferences of frugivorous birds in relation to the colors of fleshy fruits. Condor 92:545–555.CrossRefGoogle Scholar
WIRMINGHAUS, J. O. 1997. Meyer's parrot Poicephalus meyeri. Pp. 526–527 in Harrison, J. A., Allan, D. G., Underhill, L. L., Herremans, M., Tree, A. J., Parker, V. & Brown, C. J. (eds.). The atlas of Southern African birds. Volume 1. BirdLife South Africa, Johannesburg.Google Scholar
WIRMINGHAUS, J. O., DOWNS, C. T., SYMES, C. T. & PERRIN, M. R. 2002. Diet of the Cape Parrot Poicephalus robustus in afromontane forests in KwaZulu-Natal, South Africa. Ostrich 73:20–25.CrossRefGoogle Scholar
WHITNEY, K. D. 2005. Linking frugivores to the dynamics of a fruit color polymorphism. American Journal of Botany 92:859–867.CrossRefGoogle Scholar
WOLSKI, P. & SAVENIJE, H. H. G. 2006. Dynamics of floodplain-island groundwater flow in the Okavango Delta, Botswana. Journal of Hydrology 320:283–301.CrossRefGoogle Scholar