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Inter-relationships between type, size and colour of fruits and dispersal in southern African trees

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Summary

The indigenous angiosperm tree flora (1,340 species) of southern Africa was analysed for type, size and colour of fruits and class of biotic dispersal agent (consumer). Species producing fleshy (drupes and berries) and dry (pods, capsules and nuts) fruits account for 52% and 47%, respectively, of the flora. The flora contains about 2.5 times as many berry-producing as drupe-producing species. Based on a log-linear model, fruit type, consumer and fruit size are dependent statistically on each other, whereas fruit colour depends on both fruit size and consumer type acting independently of each other. Drupes and berries are consumed by birds and mammals, with berries being favoured by both birds and mammals. At least 23% (307 species) of the flora apparently depends predominantly on birds for seed dispersal. Drupes and berries favoured by birds tend to be small and brightly coloured (red or black), whereas those eaten mainly by mammals tend to be large and dull (yellow or green). Relatively few fleshy fruits are brown. Pods, capsules and nuts tend to be brown or green. Birds apparently tend to avoid eating green fruits. The notion that green coloration has evolved to enhance crypsis and/or to signal unpalatability in unripe fruit to reduce premature exploitation is questioned. Green as a cryptic colour is incompatible with the demonstrated mammalian selection of this colour, while to function aposematically a stronger contrast colour may be required.

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References

  • Berg RY (1975) Myrmecochorous plants in Australia and their dispersal by ants. Aust J Bot 23:475–508

    Google Scholar 

  • Brown MB (1973) Aids in the selection of models for multidimensional contingency tables. Available from Health Science Computing Facility University of California Los Angeles

  • Brown MB (1974) The identification of sources of significance in two-way contingency tables. Applied Statistics 23:405–413

    Google Scholar 

  • Brown MB (1976) Screening effects in multidimensional contingency tables. Applied Statistics 25:37–46

    Google Scholar 

  • Brown MB (1977a) P2F Two-way frequency tables-empty cells and departures from independence. In: Dixon WJ, Brown MB (eds) Biomedical Computer Programs P Series. University of California Press, Los Angeles

    Google Scholar 

  • Brown MB (1977b) P3F Multiway frequency tables-the log linear model. In: Dixon WJ, Brown MB (eds) Biomedical Computer Programs P Series. University of California Press, Los Angeles

    Google Scholar 

  • Chapin JP (1932–54) The birds of the Belgian Congo. Bul Amer Mus Nat Hist vols 65, 75, 75A, 75B

    Google Scholar 

  • Coates Palgrave K (1977) Trees of southern Africa. Struik Cape Town

  • Corner EJH (1949) The durian theory or the origin of the modern tree. Ann Bot 13:367–414

    Google Scholar 

  • Fienberg SE (1970) The analysis of multidimensional contingency tables. Ecology 51:419–433

    Google Scholar 

  • Fienberg SE (1972) The analysis of incomplete multi-way contingency tables. Biometrics 28:177–202

    Google Scholar 

  • Fienberg SE (1977) The Analysis of cross-classified categorical data. M.I.T. Press, Cambridge

    Google Scholar 

  • Goodman LA (1969) On partitioning λ2 and detecting partial association in three-way contingency tables. J Royal Stat Soc (B) 31:486–498

    Google Scholar 

  • Howe HF, Estabrook GF (1977) On intraspecific competition for avian dispersers in tropical trees. Amer Natur 111:817–832

    Google Scholar 

  • Huntley BJ (1965) A preliminary account of the Ngoye forest reserve, Zululand. JS Afr Bot 31:177–205

    Google Scholar 

  • Hildebrand M (1974) Analysis of vertebrate structure. Wiley New York

    Google Scholar 

  • Kendall MG (1980) Multivariate analysis 2nd edn. Griffin London

    Google Scholar 

  • Lamprey HF, Halevy G, Makacha S (1974) Interactions between Acacia, bruchid seed beetles and large herbivores. E Afr Wildl J 12:81–85

    Google Scholar 

  • Liversidge R (1965) The birds of the Addo National Park. Koedoe 8:41–67

    Google Scholar 

  • Manly BFJ (1976) Exponential data transformations. Statistician 25:37–42

    Google Scholar 

  • McKey D (1975) The ecology of coevolved seed dispersal systems. In: Gilbert LE, Raven PH (eds) Coevolution of animals and plants. University of Texas Press, Austin

    Google Scholar 

  • Morton ES (1973) On the evolutionary advantages and disadvantages of fruit eating in tropical birds. Amer Natur 107:8–22

    Google Scholar 

  • Oatley TB (1969) Bird ecology in the evergreen forests of North Western Zambia. Puku 5:141–180

    Google Scholar 

  • Palmer E (1977) Trees of southern Africa. Collins Johannesburg

    Google Scholar 

  • Palmer E, Pitman N (1972, 1973) Trees of southern Africa vols 1–3. Balkema Cape Town

    Google Scholar 

  • Phillips JFV (1927) The role of the “Bushdove” Columba arquatrix T and K, in fruit dispersal in the Knysna Forests. S Afr J Sci 24:435–440

    Google Scholar 

  • Phillips JFV (1931) Forest succession and ecology in the Knysna Region. Memoirs of the Botanical Survey of South Africa 11, Government Printer Pretoria

  • Pijl L van der (1969a) Evolutionary action of tropical animals on the reproduction of plants. In: Lowe McConnell RH (ed) Speciation in tropical environments. Academic Press, London

    Google Scholar 

  • Pijl L van der (1969b) Principles of dispersal in higher plants. Springer, Berlin Heidelberg New York

    Google Scholar 

  • Skead CJ (1965) Report on the bird life in the Mountain Zebra National Park, Cradock, C.P., 1962–1964. Koedoe 8:1–40

    Google Scholar 

  • Skutch AF (1980) Arils as food of tropical American birds. Condor 82:31–42

    Google Scholar 

  • Snow DW (1971) Evolutionary aspects of fruit-eating by birds. Ibis 113:194–202

    Google Scholar 

  • Stiles EW (1980) Patterns of fruit presentation and seed dispersal in bird-disseminated woody plants in the eastern deciduous forest. Amer Natur 116:670–688

    Google Scholar 

  • Turcek FJ (1963) Color preference in fruit- and seed-eating birds. Proceedings of XIII International Ornithological Congress 1:285–292

    Google Scholar 

  • White F (1962) Forest flora of Northern Rhodesia. University Press, Oxford

    Google Scholar 

  • Williams K (1976a) Analysis of multidimensional contingency tables. Statistician 25:51–58

    Google Scholar 

  • Williams K (1976b) The failure of Pearson's goodness of fit statistic. Statistician 25:49

    Google Scholar 

  • Wyk P van (1972–1974) Trees of the Kruger National Park, vols 1–2. Purnell Johannesburg

    Google Scholar 

Download references

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Knight, R.S., Siegfried, W.R. Inter-relationships between type, size and colour of fruits and dispersal in southern African trees. Oecologia 56, 405–412 (1983). https://doi.org/10.1007/BF00379720

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