Gradients of abundance of fish across no-take marine reserve boundaries: evidence from Philippine coral reefs

Abesamis, Rene, Russ, Garry, and Alcala, Angel (2006) Gradients of abundance of fish across no-take marine reserve boundaries: evidence from Philippine coral reefs. Aquatic Conservation: marine and freshwater ecosystems , 16 (4). pp. 349-371.

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Abstract

1. An abundance gradient from high inside to low outside a no-take marine reserve may indicate net emigration of adult fish from the reserve (spillover).

2. We examined spatial patterns of abundance of fish across two 900 m long sections of coral reef slope at each of two small Philippine islands (Apo and Balicasag). One section sampled the entire length of a no-take reserve and extended 200-400 m outside the two lateral reserve boundaries. The other section, without a reserve, was a control. The reserves had had 20 (Apo) and 15 (Balicasag) years of protection when sampled in 2002.

3. Significant spatial gradients of decreasing abundance of target fish occurred across only one (Apo Reserve northern boundary = ARNB) of four real reserve boundaries, and across none of the control boundaries. Abundance of non-target fish did not decline significantly across reserve boundaries.

4. Abundance of target fish declined sharply 50 m outside the ARNB, but enhanced abundance extended 100-350 m beyond this boundary, depending on fish mobility.

5. Density of sedentary target fish declined 2-6 times faster than density of highly vagile and vagile target fish across the ARNB.

6. Habitat factors could not account for these ARNB results for target fish, but did influence abundance patterns of non-target fish.

7. The lack of abundance gradients of target fish at Balicasag may reflect reduced fishing outside the reserve since it was established.

8. Apo Reserve had a gradient of abundance of target fish across at least one boundary, a result consistent with spillover.

Item ID: 4015
Item Type: Article (Refereed Research - C1)
Keywords: coral reefs; marine reserves; spillover; abundance gradients; habitat effects; Philippines
ISSN: 1099-0755
Date Deposited: 13 Nov 2009 03:08
FoR Codes: 06 BIOLOGICAL SCIENCES > 0602 Ecology > 060205 Marine and Estuarine Ecology (incl Marine Ichthyology) @ 33%
07 AGRICULTURAL AND VETERINARY SCIENCES > 0704 Fisheries Sciences > 070402 Aquatic Ecosystem Studies and Stock Assessment @ 33%
07 AGRICULTURAL AND VETERINARY SCIENCES > 0704 Fisheries Sciences > 070403 Fisheries Management @ 34%
SEO Codes: 96 ENVIRONMENT > 9613 Remnant Vegetation and Protected Conservation Areas > 961303 Protected Conservation Areas in Marine Environments @ 60%
83 ANIMAL PRODUCTION AND ANIMAL PRIMARY PRODUCTS > 8302 Fisheries - Wild Caught > 830299 Fisheries- Wild Caught not elsewhere classified @ 20%
83 ANIMAL PRODUCTION AND ANIMAL PRIMARY PRODUCTS > 8302 Fisheries - Wild Caught > 830201 Fisheries Recreational @ 20%
Citation Count from Web of Science Web of Science 33
Downloads: Total: 2
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