Publication
 

Temporal and spatial variability in seedling dynamics: A cross-site comparison in four lowland tropical forests

Spatial and temporal variation in seedling dynamics was assessed using records of community-wide seedling demography collected with identical monitoring methods at four tropical lowland forests in Panama, Malaysia, Ecuador and French Guiana for periods of between 3 and 10 y. At each site, the fates of between 8617 and 391 777 seedlings were followed through annual censuses of the 370-1008 1-m2 seedling plots. Within-site spatial and inter-annual variation in density, recruitment, growth and mortality was compared with among-site variability using Bayesian hierarchical modelling to determine the generality of each site's patterns and potential for meaningful comparisons among sites. The Malaysian forest, which experiences community-wide masting, was the most variable in both seedling density and recruitment. However, density varied year-to-year at all sites (CVamong years at site = 8-43%), driven largely by high variability in recruitment rates (CV = 40-117%). At all sites, recruitment was more variable than mortality (CV = 5-64%) or growth (CV = 12-51%). Increases in mortality rates lagged 1 y behind large recruitment events. Within-site spatial variation and inter-annual differences were greater than differences among site averages in all rates, emphasizing the value of long-term comparative studies when generalizing how spatial and temporal variation drive patterns of recruitment in tropical forests.

Authors: 
Norden, Natalia Chen, Yu-Yun Comita, Liza S. Metz, Margaret R. Condit, Richard Hubbell, Stephen P. Sun, I-Fang Supardi, Md. Nur Noor Wright, S. Joseph
Journal: 
Journal of Tropical Ecology
Year: 
2008
Volume: 
24
Issue: 
1
Pages: 
9-18
DOI: 
doi:10.1017/S0266467407004695