Modeling and monitoring tools to assess recovery status and convergence rates between restored and undisturbed coral reef habitats

Diego Lirman, Margaret W. Miller

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

Boating activities are an increasing source of physical damage to coral reefs worldwide. The damage caused by ship groundings can be significant and may result in a shift in reef structure and function. In this study we evaluate the status of two restoration projects established in 1995, 6 years after two freighters, the M/V Maitland and the M/V Elpis, ran aground on reefs of the Florida Keys National Marine Sanctuary. Our approach includes field monitoring in support of simulation model development to assess the effectiveness of the restoration efforts. A population model was developed for the coral Porites astreoides to project the convergence rates of coral abundance and population size structure between the restored and surrounding reference habitats. Coral communities are developing rapidly on the restoration structures. Species richness and abundance of the dominant coral, P. astreoides, were nearly indistinguishable between the restoration structures and reference habitats after only 6 years. However, although abundance and size structure of P. astreoides populations are rapidly approaching those of the reference habitats (a convergence in size structure within 10 years was simulated), maximum coral size will take twice as long to converge for this species. The sensitivity of the model to maximum recruitment rates highlights the importance of recruitment on the recovery rates of restored habitats, suggesting that special attention should be afforded to provide coral recruits with appropriate recruitment substrate at the time of restoration. Finally, the rates of convergence and, hence, the level of success of a restoration effort were shown to be influenced not only by the recruitment and survivorship rates of corals on the restoration structures but by the characteristics of the reference population as well. Accordingly, reference populations ought to be considered a "moving target" against which restoration success has to be measured dynamically. The simple, cost-effective, monitoring-modeling approach presented here can provide the necessary tools to assess the current status of a restoration effort and to project the time required for coral populations to resemble those found on undamaged reference habitats.

Original languageEnglish
Pages (from-to)448-456
Number of pages9
JournalRestoration Ecology
Volume11
Issue number4
DOIs
StatePublished - Dec 1 2003

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coral reefs
coral reef
corals
coral
monitoring
habitat
habitats
modeling
size structure
reefs
reef
boating
rate
restoration
damage
ships
survivorship
simulation models
population size
survival rate

Keywords

  • Assessment
  • Convergence rates
  • Coral restoration
  • Monitoring
  • Population modeling
  • Porites asteroides

ASJC Scopus subject areas

  • Ecology

Cite this

Modeling and monitoring tools to assess recovery status and convergence rates between restored and undisturbed coral reef habitats. / Lirman, Diego; Miller, Margaret W.

In: Restoration Ecology, Vol. 11, No. 4, 01.12.2003, p. 448-456.

Research output: Contribution to journalArticle

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