Comparison of sapling demography of four dipterocarp species with different seed-dispersal strategies

Comparison of sapling demography of four dipterocarp species with different seed-dispersal... To determine the relative roles of seed dispersal in regeneration, we compared the spatial distribution and demography of four co-occurring dipterocarp species with different seed dispersal strategies: two long-distance seed dispersers with winged seeds ( Dipterocarpus globosus and Shorea beccariana ) and two short-distance dispersers with wingless seeds ( D. tempehes and S. laxa ). The spatial distribution and dynamics of saplings of the four species were investigated to test whether seed dispersal confers benefits with respect to either increasing the availability of safe sites or avoiding high mortality near conspecific adults. The median distance between a sapling and the nearest conspecific adult increased with sapling size in the long-distance dispersers. The saplings of short-distance dispersers were largely aggregated near conspecific adults, and the median distance did not change with sapling size. Light- and topography-dependent mortality and density/distance-dependent mortality were observed in some size classes of saplings of both long-distance dispersers. However, the mortality of short-distance dispersers did not show clear density dependence, partly because of the low mortality. We concluded that the functions of long-distance seed dispersal, i.e., escape or colonization, differ with size in D. globosus and S. beccariana , while the short-distance seed dispersers D. tempehes and S. laxa have other mechanisms to avoid mortality. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Forest Ecology and Management Elsevier

Comparison of sapling demography of four dipterocarp species with different seed-dispersal strategies

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Publisher
Elsevier
Copyright
Copyright © 2004 Elsevier B.V.
ISSN
0378-1127
eISSN
1872-7042
DOI
10.1016/j.foreco.2004.12.002
Publisher site
See Article on Publisher Site

Abstract

To determine the relative roles of seed dispersal in regeneration, we compared the spatial distribution and demography of four co-occurring dipterocarp species with different seed dispersal strategies: two long-distance seed dispersers with winged seeds ( Dipterocarpus globosus and Shorea beccariana ) and two short-distance dispersers with wingless seeds ( D. tempehes and S. laxa ). The spatial distribution and dynamics of saplings of the four species were investigated to test whether seed dispersal confers benefits with respect to either increasing the availability of safe sites or avoiding high mortality near conspecific adults. The median distance between a sapling and the nearest conspecific adult increased with sapling size in the long-distance dispersers. The saplings of short-distance dispersers were largely aggregated near conspecific adults, and the median distance did not change with sapling size. Light- and topography-dependent mortality and density/distance-dependent mortality were observed in some size classes of saplings of both long-distance dispersers. However, the mortality of short-distance dispersers did not show clear density dependence, partly because of the low mortality. We concluded that the functions of long-distance seed dispersal, i.e., escape or colonization, differ with size in D. globosus and S. beccariana , while the short-distance seed dispersers D. tempehes and S. laxa have other mechanisms to avoid mortality.

Journal

Forest Ecology and ManagementElsevier

Published: Apr 5, 2005

References

  • Seedling dynamics over thirty-two years in a tropical rain forest tree
    Connell, J.H.; Green, P.T.
  • Seed dispersal in Cakile edentula var. lacustris: decoupling the fitness effects of density and distance from the home site
    Donohue, K.
  • Ecology of seed dispersal
    Howe, H.F.; Smallwood, J.
  • Seedling demography of Swida controversa : effect of light and distance to conspecifics
    Masaki, T.; Nakashizuka, T.
  • Structure, dynamics and disturbance regime of temperate broad-leaved forest in Japan
    Masaki, T.; Tanaka, H.; Tanouchi, H.; Sakai, T.; Nakashizuka, T.

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