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Case Studies
In order to provide context to the lessons learned from the implementation and management
of MPAs in East Asia and Micronesia, we have provided 25 case studies from around
the region, grouped into four categories: Habitats and Biodiversity, Socio-economic
Objectives and Impacts, MPA Benefits to Fisheries and MPA Monitoring. These case
studies represent current issues and problems in the science and management and
the approaches used to address them. All of these case studies are taken from published
journal articles or reports and the citation is provided. Click on "view details"
to read the complete case study.
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Category
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MPA monitoring
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Region / Country
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Philippines
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Project Name
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The accuracy in assumption
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Citation
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Russ, G.R., B. Stockwell, A.C. Alcala. 2005. Inferring versus measuring rates of recovery in no-take marine reserves. Marine Ecology Progress Series, Vol. 292: 1-12pp.
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To answer the question of whether the rates of biomass recovery of fished species can be inferred reliably from once-only spatial comparisons of no- take marine reserves of different ages and fished areas- a study was conducted at 15 no-take reserves and 14 adjacent control (fished) sites in the cen ...
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To answer the question of whether the rates of biomass recovery of fished species can be inferred reliably from once-only spatial comparisons of no- take marine reserves of different ages and fished areas- a study was conducted at 15 no-take reserves and 14 adjacent control (fished) sites in the central Philippines. The estimates of density and size structure of all species of Serranidae (Epinephelinae), Lutjanidae and Letthrinidae were made by underwater visual census (UVC) once in these monitored areas between June 2002 and April 2003. In the census, the habitat complexity was also monitored aside from just the estimates of fish biomass. A comparison of site-specific predicted and observed rugosity estimates at the different monitoring sites is needed to be done as a correction factor to prevent underestimation of rugosity between the reserves. The study has proven that useful inferences can be made about rates of recovery in no-take marine reserves of different ages from once-only spatial comparisons of reserves and fished sites. The increase in habitat complexity with duration of reserve protection does not indicate in the particular study’s spatial comparison data; that the longer a site is protected, the better the habitat becomes. This is because its temporal monitoring found that habitat complexity did not co-vary with fish biomass- which was inferred to increase significantly in the reserves but stay relatively stable in the fished sites. From this study, it was proven that one can make useful and reliable inferences about rates of recovery in no-take marine reserves from once-only spatial comparisons of reserve and fished sites. It also suggest that longer-lived target species is, the more circumspect one should be in making conclusions about rates of recovery from once-only spatial comparisons of reserves and fished sites. Hence, temporal monitoring studies are very important in predicting the rates of development in fish stocks in the marine reserves.
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