Variability in post-dispersal seed predation in deciduous woodland: relative importance of location, seed species, burial and density
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The considerable variability found in post-dispersal seed predation and the absence of consistent directional trends (e.g., with reference to seed size) has made it difficult to predict accurately the impact of seed predators on plant communities. We examined the variation attributable to location, seed density and seed burial on the removal of seeds of three tree species: Fraxinus excelsior, Taxus baccata and Ulmus glabra. Experiments were undertaken in five deciduous woodlands in Durham, U.K., and the relative importance of vertebrate and invertebrate seed predators was assessed using selective exclosures. In all five woodlands, seed removal was greatest from treatments to which vertebrates had access, and losses attributable to invertebrates were negligible. Rodents, in particular Apodemus sylvaticus (Muridae) and Clethrionomys glareolus (Cricetidae), were the principal seed consumers in these woodlands. Unidentified vertebrate seed predators (probably birds, rabbits and/or squirrels) appeared to be significant seed removers in three of the five woodlands. Rates of removal differed among the three tree species, increasing in the following order Fraxinus < Taxus < Ulmus but were not related to seed mass. The major effect influencing rates of seed removal was seed burial, which halved rates of seed removal overall. The effect of seed burial was a function of seed size. The larger seeds of Taxus realising little benefit from seed burial whereas encounter of the smaller Ulmus seeds fell by almost two-thirds. Removal was density-dependent for all three species. However, the relative increase in seed encounter through an increase in seed density was a negative function of seed size. This suggests that, for large seeds, the opportunity to escape seed predation via burial or reduced seed density is limited. These results reveal a number of parallels with other studies of post-dispersal predation and identify several generalities regarding the interaction between plants and post-dispersal seed predators. Comparison of the seed predation results with actual seedling distributions suggests that seed predators may influence regeneration of Ulmus glabra but probably play a lesser role in the dynamics of Taxus baccata and Fraxinus excelsior.
- Clapham, A. R., Tutin, T. G. & Moore, D. M. 1987. Flora of the British Isles. 3rd edition. Cambridge University Press, Cambridge.
- De Steven, D. 1991. Experiments on mechanisms of tree establishment in old-field succession: seedling emergence. Ecology 72: 1076–1088.
- Gardner, G. 1977. The reproductive capacity of Fraxinus excelsior on the Derbyshire limestone. Journal of Ecology 65: 107–118.
- Grime, J. P., Hodgson, J. G. & Hunt, R. 1988. Comparative plant ecology. A functional approach to common British species. Unwin Hyman Ltd., London.
- Hansson, L. 1985. The food of bank voles, woodmice and yellownecked mice. Symp. Zool. Soc. London 55: 141–168.
- Hulme, P. E. 1992. The ecology of a temperate plant in a Mediterranean environment: post-dispersal seed predation of Daphne laureola. Pp. 281–286. In: Thanos, C. A. (ed.), Plant-animal interactions in Mediterranean type ecosystems. Athens University Press, Athens.
- Hulme, P. E. 1993. Post-dispersal seed predation by small mammals. Symp. Zool. Soc. London 65: 269–287.
- Hulme, P. E. 1994. Rodent post-dispersal seed predation in grassland: magnitude and sources of variation. J. Ecol. 82: 645–652.
- Hulme, P.E. 1996a. Herbivory, plant regeneration and species coexistence. J. Ecol. 84: 609–616.
- Hulme, P. E. 1996b. Natural regeneration of yew (Taxus baccata L): microsite, seed or herbivore limitation? J. Ecol. 84: 853–861.
- Hulme, P. E. 1997. Post-dispersal seed predation and the establishment of vertebrate dispersed plants in Mediterranean scrublands. Oecologia 111: 91–98.
- Hulme, P. E. 1998a. Post-dispersal seed predation: consequences for plant demography and evolution. Persp. Plant Ecol., Syst. Evol. 1: 32–46.
- Hulme, P. E. 1998b. Post-dispersal seed predation and seed bank persistence. Seed Sci. Technol. 8: 513–519.
- Hulme, P. E. & Hunt, M. K. 1999. Rodent post-dispersal seed predation in deciduous woodland: predator response to absolute and relative abundance of prey. J. Animal Ecol. 68: 417–428.
- Jensen, T. S. 1982. Seed production and outbreaks of non-cyclic rodent populations in deciduous forests. Oecologia 54: 184–192.
- Jensen, T. S. 1985 Seed-seed predator interactions of European beech, Fagus sylvatica and forest rodents, Clethrionomys glareolus and Apodemus flavicollis. Oikos 44: 149–156.
- Jensen, T. S. & Nielsen, O. F. 1986. Rodents as seed dispersers in a heath-oak wood succession. Oecologia 70: 214–221.
- Kerley, G. I. H. & Erasmus, T. 1991. What do mice select for in seeds? Oecologia 86: 261–267.
- Kollmann, J. & Schill, H.-P. 1996. Spatial patterns of dispersal, seed predation and germination during colonisation of abandoned grassland by Quercus petraea and Corylus avellana. Vegetatio 125: 193–205.
- Louda, S. M. 1989. Predation in the dynamics of seed regeneration. Pp. 25–51 In: Leck M. A., Parker V. T., Simpson R. L. (eds.) Ecology of soil seed banks. Academic Press, San Diego.
- Montgomery, W. I. & Gurnell, J. 1985. The behaviour of Apodemus. Symp. Zoological Soc. London 55: 89–115.
- Myster, R. W. & Pickett S. T. A. 1993. Effect of litter, distance, density and vegetation patch type on post-dispersal tree seed predation in old fields. Oikos 66: 381–388.
- NAG, 1985. GLIM 3.77. Royal Statistical Society, London.
- Naylor, R. E. L. 1985. Establishment and peri-establishment mortality. Pp. 95–109. In: White J. (ed.), Studies on plant demography. A festschrift for John L. Harper. Academic Press, New York.
- Price, M. V. & Jenkins, S. H. 1986. Rodents as seed consumers and dispersers. Pp. 191–235. In: Murray D. R. (ed.), Seed dispersal. Academic Press, Sydney.
- Schopmeyer, C. S. 1974. Seeds of woody plants in the United States. Agriculture Handbook No. 540. USDA Forest Service, Washington, D.C.
- Schupp, E. W. 1988. Seed and early seedling predation in the forest understory and in the tree fall gaps. Oikos: 51: 71–78.
- Shaw, M. W. 1968. Factors affecting the natural regeneration of sessile oak (Quercus petraea) in North Wales. II. Acorn losses and germination under field conditions. J. Ecol. 56: 647–660.
- Silvertown, J. W. 1980. The evolutionary ecology of mast seeding in trees. Biol. J. Linnean Soc. 14: 235–250.
- Smith, C. C. & Reichman, O. J. 1984. The evolution of food caching by birds and mammals. Annu. Rev. Ecol. Syst. 15: 329–351.
- Sokal, R. R. & Rohlf, F. J. 1995. Biometry (3rd ed.), W. H. Freeman, New York.
- Wardle, P. 1959 The regeneration of Fraxinus excelsior. J. Ecol. 47: 483–497.
- Watt, A. S. 1919. On the causes of failure of natural regeneration in British oak-woods. J. Ecol. 7: 173–203.
- Watt, A. S. 1923. On the ecology of British beechwoods, with special reference to their regeneration: I. The causes of failure of natural regeneration of the beech (Fagus sylvatica) J. Ecol. 11: 1–48.
- Whelan, C. J., illson, M. F., Tuma, C. A. & Souza Pinto, I. 1991. Spatial and temporal patterns of post-dispersal seed predation. Can. J. Bot. 69: 428–436.
- Willson, M. F. & Whelan, C. J. 1990. Variation in post-dispersal survival of vertebrate-dispersed seeds: effects of density, habitat, location, season and species. Oikos 57: 191–198.
- Variability in post-dispersal seed predation in deciduous woodland: relative importance of location, seed species, burial and density
Volume 145, Issue 1 , pp 149-156
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- Density-dependence; Herbivory
- Seed size
- Seedling recruitment
- Spatial heterogeneity