Long-term change within a Neotropical forest: Assessing differential functional and floristic responses to disturbance and drought

Brian Enquist, Carolyn A F Enquist

Research output: Contribution to journalArticle

70 Citations (Scopus)

Abstract

Disentangling the relative roles of biotic and abiotic forces influencing forest structure, function, and local community composition continues to be an important goal in ecology. Here, utilizing two forest surveys 20-year apart from a Central American dry tropical forest, we assess the relative role of past disturbance and local climatic change in the form of increased drought in driving forest dynamics. We observe: (i) a net decrease in the number of trees; (ii) a decrease in total forest biomass by 7.7Mgha-1 but when calculated on subquadrat basis the biomass per unit area did not change indicating scale sensitivity of forest biomass measures; (iii) that the decrease in the number of stems occurred mainly in the smallest sizes, and in more moist and evergreen habitats; (iv) that there has been an increase in the proportion of trees that are deciduous, compound leaved and are canopy species, and a concomitant reduction in trees that are evergreen, simple-leaved, and understory species. These changes are opposite to predictions based on recovery from disturbance, and have resulted in (v) a uniform multivariate shift from a more mesic to a more xeric forest. Together, our results show that over relatively short time scales, community composition and the functional dominance may be more responsive to climate change than recovery to past disturbances. Our findings point to the importance of assessing proportional changes in forest composition and not just changes in absolute numbers. Our findings are also consistent with the hypothesis that tropical tree species exhibit differential sensitivity to changes in precipitation. Predicted future decreases in rainfall may result in quick differential shifts in forest function, physiognomy, and species composition. Quantifying proportional functional composition offers a basis for a predictive framework for how the structure, and diversity of tropical forests will respond to global change.

Original languageEnglish (US)
Pages (from-to)1408-1424
Number of pages17
JournalGlobal Change Biology
Volume17
Issue number3
DOIs
StatePublished - Mar 2011

Fingerprint

Drought
long-term change
floristics
drought
disturbance
Chemical analysis
Biomass
tropical forest
Recovery
community composition
biomass
Precipitation (meteorology)
Ecology
Climate change
Rain
climate change
forest dynamics
dry forest
global change
understory

Keywords

  • Climate change
  • Community ecology
  • Drought
  • El Niño
  • Long-term forest dynamics
  • Pacific Decadal Oscillation
  • Tropical dry forest

ASJC Scopus subject areas

  • Ecology
  • Global and Planetary Change
  • Environmental Science(all)
  • Environmental Chemistry

Cite this

Long-term change within a Neotropical forest : Assessing differential functional and floristic responses to disturbance and drought. / Enquist, Brian; Enquist, Carolyn A F.

In: Global Change Biology, Vol. 17, No. 3, 03.2011, p. 1408-1424.

Research output: Contribution to journalArticle

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