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Mediation of Gene Flow in Tropical Trees of Sub-Saharan Africa
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 Title & Authors
Mediation of Gene Flow in Tropical Trees of Sub-Saharan Africa
Onokpise, Oghenekome U.; Akinyele, Adejoke O.;
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 Abstract
Tropical forests whether fragmented or undisturbed or be they equatorial or deciduous, remain the storehouse of biodiversity for hundreds of thousands of plant and animal species. This unique characteristic continues to attract a wide range of scientists and international organizations to study and attempt to understand tropical forest ecosystems. Gene flow is mediated by pollen, seed and seedling dispersal, and factors affecting this gene flow include phenology, spatial distribution, population structures, seed predation, sexual and mating systems as well as physical and biological barriers to gene flow. Two methods are used in measuring gene flow: direct method that relies on the actual observation of seed and pollen dispersal, whereas indirect methods involve the use of genetic markers such as allozymes and DNA techniques. Political strife, extreme natural and artificial disasters, the lack of a comprehensive forestry research vision, coupled with difficult socio-economic conditions in Africa have made the environment quite difficult for sustained research activities on the part of those undertaking or wishing to undertake such studies. Gene flow studies in this region are few and far between. This review elaborates on the mechanisms of gene flow mediation in Sub-Saharan Africa.
 Keywords
mechanism for gene flow;mediators;population ecology;
 Language
English
 Cited by
 References
1.
Aldrich PR, Hamrick JL. 1998. Reproductive Dominance of Pasture Trees in a Fragmented Tropical Forest Mosaic. Science 281: 103-105. crossref(new window)

2.
Appanah S, Chan HT. 1981. Thrips: The Pollinators of Some Dipterocarps. Malaysian Forester 44: 234-252.

3.
Ashton PS. 1969. Speciation among Tropical Forest Trees: Some Deductions in the Light of Recent Evidence. Biol J Linn Soc 1: 155-196. crossref(new window)

4.
Baker HG. 1970. Evolution in the Tropics. Biotropica 2: 101-111. crossref(new window)

5.
Bawa KS, Crisp JE. 1980. Wind-pollination in the Understorey of a Rain Forest in Costa. Rica. Journal of Ecology 68: 871-876. crossref(new window)

6.
Boshier DH, Chase MR, Bawa KS. 1995. Population Genetics of Cordia Alliorda (Boraginaceae), a Neotropical Tree. 3. Gene flow, Neighborhood and Population Structure. Amer J Bot 82: 484-490. crossref(new window)

7.
Bowles IA, Rice RE, Mitteneier RA, da Fonseca GAB. 1998. Logging and Tropical Forest Conservation. Science 280: 1899-1900. crossref(new window)

8.
Buckley DP, O'Malley DM, Apsit V, Prance GT, Bawa KS. 1988. Genetics of Brazil nut (Bertholletia excelsa Humb & Bonpl.: (Lecythidaceae) 1. Genetic Variation in Natural Populations. Theor Appl Genet 76: 923-928. crossref(new window)

9.
Byron N, Perez MR. 1996. What Future for the Tropical Moist Forests 25 Years Hence? Commonwealth Forestry Review 75: 124-129.

10.
Chan HT. 1981. Reproductive Biology of Some Malaysian Dipterocarps. III. Breeding Systems. Malaysian Forester 44: 28-36.

11.
Chapman VJ. 1976. Mangrove Vegetation. (Inder AR, eds) Gaetner, Verlag Kommanditgesellshaft, pp 457.

12.
Clark DB, Clark DA. 1986. Regeneration of Canopy Trees in Tropical Wet Forests. Trends Ecol Evol 1: 150-154. crossref(new window)

13.
Connell JH, Lowman MD. 1989. Low-diversity Tropical Rain Forests: Some Possible Mechanisms for Their Existence. American Naturalist 134: 88-119. crossref(new window)

14.
Dudley N, Jeanrenaud JP, Sullivan F. 1995. Bad Harvest? The Timber Trade and the Degradation of the World's Forests. Earthscan, London.

15.
Ellstarnd NC, Pentice HC, Hancock JF. 1999. Gene Flow and Introgression from Domesticated Plants to Their Wild Relatives. Ann Rev Ecol Syst 30: 539-563. crossref(new window)

16.
Elmqvist T, Cox PA, Rainey WE, Pierson ED. 1992. Restricted Pollination on Oceanic Islands: Pollination of Ceiba Pentandra by Flying Foxes in Samoa. Biotropica 24: 15-23. crossref(new window)

17.
FAO. 1982. Tropical Forest Resources Assessment Study. FAO Paper No 30. Rome.

18.
Finkeldey R. 1999. An Introduction to Forest Genetics. Georg-August-University of Georgia Institute of Forest Genetics and Forest Tree Breeding, Lecture Manual.

19.
Finkeldey R. 2001. Gene Flow within and Among Populations: A Review of Methods and Results from Temperate and Tropical Forest Trees. Sub-Pleanary Papers and Abstracts. Forests and Society. The Role of Research. Vol. I. XXI IUFRO World Congress, 7-12, 2000. Kuala Lumpur.

20.
Finkeldey R, Hattemer HH. 2007. Tropical Forest Genetics. Springer-Verlag, Berlin.

21.
Foster PF, Sork VL. 1997. Population and Genetic Structure of the west African Rain Forest Liana Ancistrocladus Korupensis (Ancistrocladaceae). Am J Bot 84: 1078-1091. crossref(new window)

22.
Frankie GW, Haber WA, Opler PA, Bawa KS. 1983. Characteristics and Organization of the Large Bee Pollination System in the Costa Rican Dry Forest. In: Handbook of Experimental Pollination Biology (Jones CE, Little RJ, eds.) Van Nostrand Reinhold, New York, pp 411-447.

23.
Gascon C, Lougheed SC, Bogart JP. 1996. Genetic and Morphological Variation in Vanzolinus Discodactylus: A Test of the River Hypothesis of Speciation. Biotropica 28: 376-387. crossref(new window)

24.
Gill AM, Tomlinson PB. 1969. Studies on the Growth of Red Mangrove (Rhizophora mangle L.). I. Habit and General Morphology. Biotropica 1: 1-9. crossref(new window)

25.
Gregorius HR, Hattemer HH, Bergmann F. 1995. Umweltbelastung und Anpassungsfaigkeit von Baumpopulationen. Silvae Genetica 34: 230-241.

26.
Hamilton AC. 1982. Environmental History of East Africa. Academic Press, London.

27.
Hamilton MB. 1999. Tropical Tree Gene Flow and Seed Dispersal: Deforestation Affects the Genetic Structure of the Surviving Forest Fragments. Nature 401: 129-130. crossref(new window)

28.
Hamrick JL, Loveless MD. 1989. The Genetic Structure of Tropical Tree Populations. Associations with Reproductive Biology. In: The Evolutionary Ecology of Plants (Bock JH, Linhart YB, eds.) Westview Press, Boulder, Colorado, pp 129-146.

29.
Harper JL, Lovell PH, Moore KG. 1970. The Shapes and Sizes of seeds. Annu Rev Ecol Syst 1: 327-356. crossref(new window)

30.
Hattemer HH, Melchior GH. 1993. Genetics and Its Application to Tropical Forestry In: Tropical Froestry Handbook. Vol. I (Pancel, ed.) Berlin, etc., Springer, pp 333-380.

31.
Howe HF. 1986. Seed Dispersal by Fruit-eating Birds and Mammals. In: Seed Dispersal (Murray DR, ed.) Academic Press, New York, pp 123-190.

32.
Howe HF. 1990. Seed Dispersal by Birds and Mammals: Implications for Seedling Demography. UNESCO and the Parthenon Publishing Group, Paris, pp 191-218.

33.
Janzen DH. 1983. Dispersal of Seeds by Vertebrate Guts. In: Coevolution (Futuyma DJ, Slatkin M, eds.) Sinauer Associates, Sunderland, MA, pp 232-262.

34.
Jones EW. 1956. 'Ecological Studies on the Rain Forest of Southern Nigeria: IV (continued) the Plateau Forest of the Okomu Forest Reserve, Part 2. The Reproduction and History of the Forest'. Journal of Ecology 44: 83-117. crossref(new window)

35.
Klug WS, Cummings MR. 2000. Concepts of Genetics. 2nd ed. Prentice Hall, Upper Saddle River, New Jersey.

36.
Leighton M, Leighton DR. 1983. Vertebrate Responses to Fruiting Seasonality within a Bornean Rain Forest. In: Tropical Rain Forest: Ecology and Management (Sutton SL, Whitmore TC, Chadwick AC, eds.) Blackwell Press, Oxford, pp 181-186.

37.
Levin DA, Kester HW. 1974. Gene Flow in Seed Plants. Evolutionary Biology 7: 139-220.

38.
Lieberman D, Hall JB, Swaine MD, Lieber-man M. 1979. Seed Dispersal by Baboons in the Shai Hills, Ghana. Ecology 60: 65-75. crossref(new window)

39.
Linder HP. 2001. Plant Diversity and Endemism in Sub-Saharan Tropical Africa. Journal of Biogeography 28: 169-182. crossref(new window)

40.
McDonald MB, Copeland LO. 1997. Seed Production, Principles and Practices. Chapman & Hall, New York, pp 590-643.

41.
Medellín RA, Gaona O. 1999. Seed Dispersal by Bats and Birds in Forest and Disturbed Habitats of Chiapas, Mexico. Biotropica 31: 478-485. crossref(new window)

42.
Mori Y, Okada H. 2001. Reproductive Biology and Pollen Flow of a Rheophytic Aroid, Furtadoa Sumatrensis (Araceae) in the Malesian Wet Tropics. Plant Ssyst Evol 227: 37-47. crossref(new window)

43.
Nason JD, Hamrick JL. 1997. Dispersal and Dynamics of Genetic Structure of Fragmented Tropical Tree Populations. In: Tropical Forest Remnants: Ecology, Management and Conservation of Fragmented Communities (Lawrence WF, Bierregard RO, eds.) University of Chicago Press, Chicago, pp 304-320.

44.
Pannell CM. 1989. The Role of Animals in Natural Regeneration and the Management of Equatorial Rain Forests for Conservation and Timber Production. Commonwealth Forestry Review 68: 309-313.

45.
Pannel CM, Koziol MJ. 1987. Ecological and Phytochemical Diversity of Arrilate Seeds in Agalia (Meliaceae): Astudy of the Vertebrate Dispersal in Tropical Trees. Phil. Trans R Soc London B 316: 303-333. crossref(new window)

46.
Rabinowitz D. 1978. Dispersal Properties of Mangrove Propagules. Biotropica 10: 47-57. crossref(new window)

47.
Reis NR, Guillamet JL. 1983. Les Chauves-souris Frugivores de la Region de Manaus et Leur Role Dans la Dissemination Des espece Vegetale. Revue d'Ecologie (Terre et Vie) 38: 147-169.

48.
Richard M, Costa PM. 1999. Can Tropical Forestry be Made Profitable by "Internationalizing the Externalities." Natural Resources Perspectives No. 46. 4 ODI, London.

49.
Slatkin M. 1987. Gene Flow and Geographic Structure of Natural Populations. Science 237: 787-792.

50.
Stocker GC. 1981. Regeneration of a North Queensland Rain Forest Following Felling and Burning. Biotropica 13: 86-92. crossref(new window)

51.
Stocker GC, Irvine AK. 1983. Seed Dispersal by Cassowaries (Casuarius casuarius) in North Queensland's Rainforests. Biotropica 15: 170-176. crossref(new window)

52.
Wang K. 2001. Gene flow and mating system in european beech (Fagus sylvatica. L.). Ph.D. dissertation. Georg-August University of Gottingen, Gottingen, Germany.

53.
Webb CJ, Bawa KS. 1983. Pollen Dispersal by Hummingbirds and Butterflies: A Comparative Study of Two Lowland Tropical Plants. Evolution 37: 1258-1270. crossref(new window)

54.
White TL, Thomas Adams W, Neale DB. 2007. Forest Genetics. CAB International Publishing, Oxford.