Floss release, seed fall and germination of kapok seeds (Ceiba pentandra) in an urban environment ()
Range Management Section, Department of Animal Science and Production, Sokoine University of Agriculture, Morogoro, Tanzania&Department of Fish and Wildlife Conservation, Virginia Polytechnic and State University, Blacksburg, USA.
The tropical forest kapok tree occurs widely in urban environments, dispersing thousands of floss during the fruiting season. However, its seedlings are rarely seen around human settlements, raising questions on what factorsmight be limiting its recruitment. We examined the pattern of floss release, seed fall post-dispersal and influences of watering frequency on germination ofCeiba pentandraseeds. Evening,overall, was associated with a significantlyhigher rate and quantity of floss release (p= 0.0001) than were mid-day and morning, correlating well with the speed of wind across the day (rh = 0.666,p= 0.001). Mean dispersal quantity differed significantly between the individual sampled trees, in which the highest dispersal was recorded from trees located in relatively open areas and the lowest was recorded in closed stand trees. Seed fall was higher within100 mdistances than seed fall farther away from dispersing trees, depending on the microsites and weather conditions. Germination started on day 5 onwards and only 15.67% of sown seeds germinated. Watering frequency strongly influenced seed germination while local human activities determined fate of dispersed seeds. We conclude that recruitment ofC. pentandraspecies in the study area may have been limited by environmental and human factors operating at various local and spatial scales.
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Conflicts of Interest
The authors declare no conflicts of interest.
Gribel, R., Gibbs, P. E. and Queiroaz, A.L. (1999) Flowering phenology and pollination biology of Ceiba pentandra (Bombacaceae) in Central Amazonia. Journal of Tropical Ecology, 15, 247-263.
|||Baker, H.G. and Harris, B.J. (1959) Bat-pollination of the silk-cotton tree, Ceiba pentandra (L.) Gaertn. (sensu lato), in Ghana. Journal of the West African Science Association, 4, 1-9.|
Cox, P.A. (1983) Observations on the natural history of Samoan bats. Mammalia, 47, 519-521.
|||Elmqvist, T., Cox, P.A., Rainey, W.E. and Pierson, E.D. (1992) Restricted pollination on oceanic islands: Pollination of Ceiba pentandra by flying foxes in Samoa. Biotropica, 24, 15-23. http://dx.doi.org/10.2307/2388469|
Heithaus, E.R., Fleming, T.H. and Opler P.A. (1975) Foraging patterns and resource utilization in seven species of bats in a seasonal tropical forest. Ecology, 56, 841-854.
Baker, H.G. (1955) Self-compatibility and establishment after “long-distance” dispersal. Evolution, 9, 347-349.
|||Murawski, D.A. and Hamrick, J.L. (1992) Mating system and phenology of Ceiba pentandra (Bombacaceae) in Central Panama. Journal of Heredity, 83, 401-404.|
|||Toledo, V.M. (1977) Pollination of some rain forest plants by non-hovering birds in Veracruz, Mexico. Biotropica, 9, 262-267. http://dx.doi.org/10.2307/2388144|
Janson, C.H., Terborgh, J. and Emmons L.H. (1981) Nonflying mammals as pollinating agents in the Amazonian forest. Biotropica, 13, 1-6.
Nathan, R. and Muller-Landau, H.C. (2000) Spatial patterns of seed dispersal, their determinants and conesquences for recruitment. Trends in Ecology & Evolution, 15, 278-285.
Vander Wall, S.B. and Joyner, J.W. (1998) Secondary dispersal by the wind of winged pine seeds across the ground surface. The American Midland Naturalist Journal, 139, 365-373.
Voysey, B.C., McDonald, K.E., Rogers, M.E., Tutin, C.E. G. and Parnell R. J. (1999) Gorillas and seed dispersal in the Lopé Reserve, Gabon. II: Survival and growth of seedlings. Journal of Tropical Ecology, 15, 23-38.
|||Schupp, E.W. and Fuentes, M. (1995) Spatial patterns of seed dispersal and the unification of plant population ecology. Ecoscience, 2, 267-275.|
|||Vander Wall, S.B., Kuhn, K.M. and Beck, M.J. (2005) Seed removal, seed predation, and secondary dispersal. Ecology, 86, 801-806. http://dx.doi.org/10.1890/04-0847|
Orrock, J.L., Levey, D.J., Danielson, B.J. and Damschen, E.I. (2006) Seed predation, not seed dispersal, explains the landscape-level abundance of an early-successional plant. Journal of Ecology, 94, 838-845.
VazFerreira, A., Bruna, E.M. and Vasconcelos, H.L. (2011) Seed predators limit plant recruitment in Neotropical savannas. Oikos, 120, 1013-1022.
Gentry, A.H. and Vasquez, R. (1988) Where have all the Ceibas gone? A case history of mismanagement of a tropical forest resource. Forest Ecology and Management, 23, 73-76.
|||Friday, E.T., James, O., Olusegun, O. and Gabriel, A. (2011) Investigations on the nutritional and medicinal potentials of Ceiba pentandra leaf: A common vegetable in Nigeria. International Journal of Plant Physiology and Biochemistry, 3, 95-101.|
|||Theng, K., Preston, T.R. and Ly, J. (2003) Studies on utilisation of trees and shrubs as the sole feedstuff by growing goats; foliage preferences and nutrients utilization. Livestocks Research & Rural Development, 15, 7.|
|||Rija, A. A. (2003) Feeding habits, abundance and distribution of pied crow Corvus albus around the Uluguru Mountains, Morogoro Tanzania. BSc. Thesis, Library of Sokoine University of Agriculture, Tanzania.|
|||Morrison, M.E.S. and Lind, E.M. (1974) East Africa vegetation. Longman, London, 257 p.|
|||Frankie, G.W., Baker, H.G. and Opler, P.A. (1974) Comparative phenological studies of trees in tropical wet and dry forests in the lowlands of Costa Rica. Journal of Ecology, 62, 881-913. http://dx.doi.org/10.2307/2258961|
Lobo, J.A., Quesada, M., Stoner, K.E., Fuchs, E.J., Herrerias-Diego, Y., Rojas, J. and Saborio G. (2003) Factors affecting phenological patterns of bombacaceous trees in seasonal forests in Costa Rica and Mexico. American Journal of Botany, 90, 1054-1063.
|||Khurana, E. and Singh, J.S. (2001) Ecology of seed and seedling growth for conservation and restoration of tropical dry forest: A review. Environmental Conservation, 28, 39-52. http://dx.doi.org/10.1017/S0376892901000042|
Horn, H.S., Nathan, R. and Kaplan, S.R. (2001) Longdistance dispersal of tree seeds by wind. Ecological Research, 16, 877-885.
Bohrer, G., Katul, G.G., Nathan, R., Walko, R.L. and Avissar, R. (2008) Effects of canopy heterogeneity, seed abscission and inertia on wind-driven dispersal kernels of treeseeds. Journal of Ecology, 96, 569-580.
Nathan, R., Safrie, U.N., Noy-Meir, I. and Schiller, G. (1999) Seed release without fire in Pinus halepensis, a Mediterranean serotinous wind-dispersed tree. Journal of Ecology, 87, 659-669.
Greene, D.F. and Johnson, E.A. (1992) Fruit abscission in Acer saccharinum with reference to seed dispersal. Canadian Journal of Botany, 70, 2277-2283.
|||Nathan, R., Horn, H.S., Chave, J. and Levin, S.A. (2002) Mechanistic models for tree seed dispersal by wind in dense forests and open landscapes. In: Levey, D.J., Silva, W.R. and Galetti, M., Eds., Seed Dispersal and Frugivory: Ecology, Evolution and Conservation, CABI International, Oxfordshire, 69-82.|
Bullock, J.M. and Clarke, R.T. (2000) Long distance seed dispersal by wind: Measuring and modelling the tail of the curve. Oecologia, 124, 506-521.
Pearson, T.R.H., Burslem, D.F.R. Mullins, P.C.E. and Dalling, J.W. (2002) Germination ecology of neotropical pioneers: Interacting effects of environmental conditions and seed size. Ecology, 83, 2798-2807.
|||Dileep, M., Sudhakara, K., Santosh Kumar, A.V., Nazeema, K.K. and Ashokan, P.K. (1994) Effect of seed size, rooting medium and fertilizers on the growth of seedlings of Ceiba pentandra (Linn) Gaertn. Indian Journal of Forestry, 17, 293-300.|
|||Khan, A.A. (1980) The physiology and biochemistry of seed dormancy and germination. North Holland, New York.|
|||Kandya, S. (1990) Studies on the biochemical basis of seed dormancy in some forest tree species used in social forestry programmes. Ph.D. Thesis, Dr H.S. Gour University Sagar, India.|
Singaravelan, N. and Marimuthu, G. (2004) Nectar feeding and pollen carrying from Ceiba pentandra by pteropodid bats. Journal of Mammalogy, 85, 1-7.
|||Rija, A.A. (2010) Incentives for conserving and greening our cities. Tanzania Wildlife Magazine-Kakakuona, 57, 58-61.|