Spatial patterns reveal negative density dependence and habitat associations in tropical trees

Robert Bagchi, Peter A. Henrys, Patrick E. Brown, David F. R. P. Burslem, Peter J. Diggle, C. V. Savitri Gunatilleke, I. A. U. Nimal Gunatilleke, Abdul Rahman Kassim, Richard Law, Supardi Noor, Renato L. Valencia

Research output: Contribution to journalArticle

68 Citations (Scopus)

Abstract

Understanding how plant species coexist in tropical rainforests is one of the biggest challenges in community ecology. One prominent hypothesis suggests that rare species are at an advantage because trees have lower survival in areas of high conspecific density due to increased attack by natural enemies, a process known as negative density dependence (NDD). A consensus is emerging that NDD is important for plant-species coexistence in tropical forests. Most evidence comes from short-term studies, but testing the prediction that NDD decreases the spatial aggregation of tree populations provides a long-term perspective. While spatial distributions have provided only weak evidence for NDD so far, the opposing effects of environmental heterogeneity might have confounded previous analyses. Here we use a novel statistical technique to control for environmental heterogeneity while testing whether spatial aggregation decreases with tree size in four tropical forests. We provide evidence for NDD in 22% of the 139 tree species analyzed and show that environmental heterogeneity can obscure the spatial signal of NDD. Environmental heterogeneity contributed to aggregation in 84% of species. We conclude that both biotic interactions and environmental heterogeneity play crucial roles in shaping tree dynamics in tropical forests.

Original languageEnglish
Pages (from-to)1723-1729
Number of pages7
JournalEcology
Volume92
Issue number9
DOIs
Publication statusPublished - Sep 2011

Keywords

  • environmental heterogeneity
  • inhomogeneous K function
  • Janzen-Connell hypothesis
  • negative density dependence
  • species coexistence
  • tropical rain forest
  • rain-forest
  • point-processes
  • soil nutrients
  • diversity
  • recruitment
  • distributions
  • populations
  • mortality
  • inference

Cite this

Bagchi, R., Henrys, P. A., Brown, P. E., Burslem, D. F. R. P., Diggle, P. J., Gunatilleke, C. V. S., ... Valencia, R. L. (2011). Spatial patterns reveal negative density dependence and habitat associations in tropical trees. Ecology, 92(9), 1723-1729. https://doi.org/10.1890/11-0335.1

Spatial patterns reveal negative density dependence and habitat associations in tropical trees. / Bagchi, Robert; Henrys, Peter A.; Brown, Patrick E.; Burslem, David F. R. P.; Diggle, Peter J.; Gunatilleke, C. V. Savitri; Gunatilleke, I. A. U. Nimal; Kassim, Abdul Rahman; Law, Richard; Noor, Supardi; Valencia, Renato L.

In: Ecology, Vol. 92, No. 9, 09.2011, p. 1723-1729.

Research output: Contribution to journalArticle

Bagchi, R, Henrys, PA, Brown, PE, Burslem, DFRP, Diggle, PJ, Gunatilleke, CVS, Gunatilleke, IAUN, Kassim, AR, Law, R, Noor, S & Valencia, RL 2011, 'Spatial patterns reveal negative density dependence and habitat associations in tropical trees' Ecology, vol. 92, no. 9, pp. 1723-1729. https://doi.org/10.1890/11-0335.1
Bagchi, Robert ; Henrys, Peter A. ; Brown, Patrick E. ; Burslem, David F. R. P. ; Diggle, Peter J. ; Gunatilleke, C. V. Savitri ; Gunatilleke, I. A. U. Nimal ; Kassim, Abdul Rahman ; Law, Richard ; Noor, Supardi ; Valencia, Renato L. / Spatial patterns reveal negative density dependence and habitat associations in tropical trees. In: Ecology. 2011 ; Vol. 92, No. 9. pp. 1723-1729.
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