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Description:
Author(s):
Vardi, T., Williams, D. E., Sandin, S. A.
Title:
Population dynamics of threatened elkhorn coral in the northern Florida Keys, USA
Publication Date:
2012
Journal Title:
Endangered Species Research
Volume:
19
Issue:
2
Page(s):
157-169
Abstract:
"Caribbean elkhorn coral Acropora palmata (Lamarck, 1816) was once so widespread and abundant that geologists use its fossils to measure sea levels from the Pleistocene through the Holocene. Now it exists at a small fraction of its former abundance and is listed, along with a congener, as 'threatened' under the US Endangered Species Act. We conducted annual demographic surveys on the northern Florida Keys (USA) population from 2004 to 2010. Percent cover of the benthos, number of colonies, and dominance by large individuals declined throughout the study period. We created population matrix models for each annual interval of the study, which included a severe hurricane year (2005-2006). Hurricane recurrence was simulated stochastically along with multiple outplanting scenarios. Population depletion is predicted given a return time for severe hurricanes of 20 yr or less. Elasticity analysis showed that the largest individuals have the greatest contribution to the rate of change in population size. Active management through outplanting can provide a positive population trajectory over the short term, especially if colonies are reared for several years before transplanting. However, the former abundance of this species suggests that background life history traits, specifically rates of growth versus shrinkage measured herein, are fundamentally different from what they must have been in the past. Ultimately, recovery of this species will depend on enacting local short-term management solutions while improving regional and global environmental conditions."
Electronic DOI:
Notes:
CRCP Project ID 1055; Project Title: Assessment and Monitoring of Candidate Coral Species; Principal Investigator: Margaret Miller. CRCP Project ID 20430; Project Title: Evaluation of Acropora Status for Management, Recovery and Climate Response; Principal Investigator: Margaret Miller.
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