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Spatial and temporal variation of abundance, biomass and diversity within marine reserves in the Philippines

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Abstract Aim 

The objective of this study was to investigate the influence of protection duration (years of fishing closure) and location (distance from shore) on reef fish diversity. Location 

Danajon Double Barrier Reef, Bohol, Philippines. Methods 

Reef fish abundance and size structure, by species, were obtained monthly using replicated underwater visual belt transects (n = 8; 70 × 5-m belt transects) over 3 years (2002–2005) at eight sites that included six marine reserves and two unprotected reef areas. We analysed species accumulation curves, diversity indices and abundance–biomass comparison (ABC) curves within and across the study sites to assess the influence of protection duration and location. Results 

Analyses showed that longer protection duration impacted reef fish diversity at both inshore and offshore sites by shifting ABC curves from higher abundance than biomass curves at fished sites to higher biomass than abundance curves at most of the protected sites. Protection duration did not significantly influence either the rate of species accumulation within sites or the 12 diversity indices measured across the study sites. The offshore sites consistently showed higher rates of species accumulation and diversity indices values than inshore sites with similar protection duration. One protected offshore young marine reserve site that has been assessed as the least well-managed showed patterns more consistent with the fished sites. Main conclusions 

Analyses showed that protection duration mainly impacted diversity by increasing the dominance of large-bodied species and enhancing total biomass. Besides protection duration, reserve location influenced species accumulation curves and diversity indices.
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Keywords: Biodiversity; conservation; marine protected areas; no-take zones; overfishing; small-scale fisheries

Document Type: Research Article

Affiliations: 1: Sea Around Us Project, The University of British Columbia, 2202 Main Mall, Vancouver, British Columbia V6T 1Z4, Canada 2: Project Seahorse, Fisheries Centre, The University of British Columbia, 2202 Main Mall, Vancouver, British Columbia V6T 1Z4, Canada

Publication date: 2010-07-01

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