Density-dependent dynamics of a dominant rain forest tree change with juvenile stage and time of masting

Oecologia
Julian M Norghauer, David M Newbery

Abstract

Although negative density dependence (NDD) can facilitate tree species coexistence in forests, the underlying mechanisms can differ, and rarely are the dynamics of seedlings and saplings studied together. Herein we present and discuss a novel mechanism based on our investigation of NDD predictions for the large, grove-forming ectomycorrhizal mast fruiting tree, Microberlinia bisulcata (Caesalpiniaceae), in an 82.5-ha plot at Korup, Cameroon. We tested whether juvenile density, size, growth and survival decreases with increasing conspecific adult basal area for 3245 'new' seedlings and 540 'old' seedlings (< 75-cm tall) during an approximately 4-year study period (2008-2012) and for 234 'saplings' (≥ 75-cm tall) during an approximately 6-year study period (2008-2014). We found that the respective densities of new seedlings, old seedlings and saplings were positively, not and negatively related to increasing BA. Maximum leaf numbers and heights of old seedlings were negatively correlated with increasing basal areas, as were sapling heights and stem diameters. Whereas survivorship of new seedlings decreased by more than one-half with increasing basal area over its range in 2010-2012, that of old seedlings decreased by almost two-t...Continue Reading

References

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May 19, 2012·Science·Daniel J JohnsonKeith Clay
Jun 1, 2012·Oecologia·Salvador Herrando-PérezCorey J A Bradshaw
Nov 26, 2015·Ecology·Kai ZhuJames S Clark

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Citations

Oct 19, 2017·Ecology and Evolution·Benjamin S RamageKeith Clay
Apr 25, 2018·The New Phytologist·Adriana CorralesMatthew E Smith

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