Community structure, species composition, and changes over time after
disturbances are frequently studied using common descriptors. We used rank
abundance distribution plots (RADs), Rényi entropy plots, common theoretical
community models, ordination analysis of similarities (ANOSIM and Clusters),
and abundance spectra analyses to study the effects of a gradual natural
population decline and an anthropogenic punctuated disturbance on the
structure of octocoral communities in Panama, considered a hot spot area for
octocoral diversity in the Tropical Eastern Pacific. Over a 17-month period,
no significant change was found in community structure after a natural
yearly population decline of 25.2%. After a disturbance, however, different
recovery trajectories were observed in various coral communities. Possible
physical and biological explanations for the observed differences include
initial local species diversity and abundance, species life history
patterns, colony morphology, and the geographical location of the community.
Differences in community structure between study sites were best described
using a combination of community descriptors, RADs, and abundance spectra.
Rényi plots were useful in identifying changes in community structure,
whereas the extent of the changes was best evaluated using ANOSIM and
cluster analysis.