Porfirio M. Aliño

A review of the status of Philippine reefs

Abstract Since 1979, the status of Philippine reefs has been periodically updated. While conditions of the reefs during the early surveys were assessed in terms of live coral cover per se, the ‘coral mortality index’ was applied to the sets of data collected during the past 7 yr which may be a better gauge in determining the health of the reefs. Generally, most reefs surveyed are in fair condition. Major destructive factors described are sedimentation and siltation from coastal development and activities inland, illegal and destructive methods of fishing, and overfishing. If the reefs are to continue to provide for the present and future users, the ecological processes that render them productive must be maintained through integrated approaches of coastal area management.

Designing Marine Reserves for Fisheries Management, Biodiversity Conservation, and Climate Change Adaptation

Overfishing and habitat destruction due to local and global threats are undermining fisheries, biodiversity, and the long-term sustainability of tropical marine ecosystems worldwide, including in the Coral Triangle. Well-designed and effectively managed marine reserve networks can reduce local threats, and contribute to achieving multiple objectives regarding fisheries management, biodiversity conservation and adaptation to changes in climate and ocean chemistry. Previous studies provided advice regarding ecological guidelines for designing marine reserves to achieve one or two of these objectives. While there are many similarities in these guidelines, there are key differences that provide conflicting advice. Thus, there is a need to provide integrated guidelines for practitioners who wish to design marine reserves to achieve all three objectives simultaneously. Scientific advances regarding fish connectivity and recovery rates, and climate and ocean change vulnerability, also necessitate refining advice for marine reserve design. Here we review ecological considerations for marine reserve design, and provide guidelines to achieve all three objectives simultaneously regarding: habitat representation; risk spreading; protecting critical, special and unique areas; reserve size, spacing, location, and duration; protecting climate resilient areas; and minimizing and avoiding threats. In addition to applying ecological guidelines, reserves must be designed to address social and governance considerations, and be integrated within broader fisheries and coastal management regimes.

Monitoring and evaluation of reef protected areas by local fishers in the Philippines: tightening the adaptive management cycle

Monitoring by local community managers tightens the adaptive management cycle by linking management more closely with its evaluation, so management actions become more responsive to the field situation. Local community volunteers, usually fishers, managing coral reef protected areas in the Philippines used simple methods (e.g. snorkeling fish visual census) to periodically monitor and evaluate reef protection together with professional marine biologists. Except for estimates of hard coral, data collected by local volunteers were not significantly correlated with data collected by biologists (specifically abundance estimates of sand, major reef fish carnivores, and fish herbivores). Community-collected fish data generally have higher variance and show higher abundances than biologist-collected data. Nonetheless, though the data was less precise, the locally based monitoring identified or confirmed the need for management actions that were generic in nature (e.g. stronger enforcement, organizational strengthening, etc.). The locally based monitoring also encouraged cooperation among stakeholders and prompted a management response. Little time and financing is required after initial establishment and replication has been increasing. However, sustainability depends upon the communities’ perceived added-value of undertaking the monitoring and input from a paid and/or more committed local person (e.g. government) who occasionally conducts monitoring himself/herself and supervises the community monitoring. Management impact depends heavily upon good integration with active management interventions outside the monitoring effort per se

Marine Protected Areas in the Coral Triangle: Progress, Issues, and Options

The six Coral Triangle countries—Indonesia, Malaysia, Papua New Guinea, Philippines, Solomon Islands, and Timor-Leste—each have evolving systems of marine protected areas (MPAs) at the national and local levels. More than 1,900 MPAs covering 200,881 km2 (1.6% of the exclusive economic zone for the region) have been established within these countries over the last 40 years under legal mandates that range from village level traditional law to national legal frameworks that mandate the protection of large areas as MPAs. The focus of protection has been primarily on critical marine habitats and ecosystems, with a strong emphasis on maintaining and improving the status of near-shore fisheries, a primary food and economic resource in the region. This article brings together for the first time a consistent set of current data on MPAs for the six countries and reviews progress toward the establishment of MPAs in these countries with regard to (i) coverage of critical habitat (e.g., 17.8% of the coral reef habitat within the region lies within an MPA), (ii) areas under effective management, and (iii) actions needed to improve the implementation of MPAs as a marine conservation and resource management strategy. The contribution of MPAs to the Coral Triangle MPA System as called for in the Coral Triangle Initiative on Coral Reefs, Fisheries and Food Security Regional Plan of Action is clarified. Options for scaling up existing MPAs to networks of MPAs that are more ecologically linked and integrated with fisheries management and responsive to changing climate through the Coral Triangle MPA System development are discussed. A key point is the need to improve the effectiveness of existing MPAs, and plan in a manner leading to ecosystem-based management.

A multi-scale biophysical model to inform regional management of coral reefs in the western Philippines and South China Sea

The health and functioning of coral reef ecosystems worldwide is in decline, and in the face of increasing anthropogenic stress, the rate of decline of these important ecosystems is set to accelerate. Mitigation strategies at regional scales are costly, but nevertheless critical, as reef systems are highly connected across regions by ocean transport of both larval propagules and pollutants. It is essential that these strategies are informed by sound science, but the inherent complexity of coral reef systems confers significant challenges for scientists and managers. Models are useful tools for dealing with complexity and can inform decision making for coral reef management. We develop a spatially explicit biophysical model for a general coral reef system. The model couples dynamics from local (10^2 m) to regional (10^6 m) scales, and explicitly incorporates larval connectivity patterns derived from sophisticated larval dispersal models. Here, we instantiate and validate the model for coral reefs in the Philippines region of the South China Sea. We demonstrate how the model can be used in decision support for coral reef management by presenting two examples of regional-scale scenario projection relating to key management issues in the Philippines: (i) marine reserve design and the recovery of fish stocks; and (ii) synergistic effects between coral bleaching and poor water quality. These scenarios highlight the importance of considering multiple stressors to reef health and patterns of larval connectivity in regional-scale management decisions.

Developing Marine Protected Area Networks in the Coral Triangle: Good Practices for Expanding the Coral Triangle Marine Protected Area System

The Coral Triangle Marine Protected Area System aspires to become a region-wide, comprehensive, ecologically representative and well-managed system of marine protected areas (MPAs) and MPA networks. The development of this system will proceed primarily through the implementation of ecological, social, and governance MPA networks at the sub-national scale. We describe six case studies that exemplify different approaches taken to develop MPA networks in the Coral Triangle region at different scales: Nusa Penida in Indonesia; Tun Mustapha Park in Malaysia; Kimbe Bay in Papua New Guinea; Verde Island Passage in the Philippines; The Lauru Ridges to Reefs Protected Area Network in Choiseul, Solomon Islands; and Nino Konis Santana Park in Timor Leste. Through synthesis of these case studies, we identify five common themes that contributed to successful outcomes: (1) the need for multi-stakeholder and cross-level management institutions; (2) the value of integrating cutting-edge science with local knowledge and community-based management; (3) the importance of building local capacity; (4) using multiple-use zoning to balance competing objectives; and (5) participation in learning and governance networks. These lessons will be invaluable in guiding future efforts to expand the Coral Triangle Marine Protected Area System, and provide important insights for MPA practitioners elsewhere.

Exploitation-related reef fish species richness depletion in the epicenter of marine biodiversity

The central Visayan region of the Philippines historically has the highest concentration of coral reef fishes than any other large marine area in the world. This well-supported biogeographic phenomenon is contradicted by recent transect observations on coral reefs that indicates that the Visayan region and the southern Philippine Sea region have the lowest species richness in the Philippines. The Visayan region has unusually low counts of species typically exploited in fisheries and the aquarium trade. This evidence, coupled with numerous reports of intense fishing and habitat degradation and subsequent species declines at local scales suggests that this exploitation is having a cumulative effect on the overall species richness of the Visayan region. Successes in Marine Protected Areas in this region in increasing species richness at local scales suggests that improved management of these protected areas coupled with much more intensive fisheries management will be key to reviving a healthy biodiversity in the Visayas.

Multi-species spawning of corals in north-western Philippines

The Philippines has more than 30,000 km of reef area and hosts some of the world’s most diverse and endangered coral communities, however there is little information on patterns of coral reproduction (Bermas et al. 1992) and to date there are no published accounts of direct spawning observations. Sampling to determine the reproductive state of Acropora species and in situ observations of coral spawning was conducted in 2006 and 2007 at sites close to the Bolinao Marine Laboratory (BML) in northwestern Luzon, (16 22¢N 119 54¢E). Prior to the full moon in March 2006, 22 sampled Acropora species (67% of colonies, n = 208) contained white or pigmented oocytes large enough to be visible in branches that were fractured artificially underwater (for methods see Baird et al. 2002) suggesting a seasonal peak in reproduction from March to May. Night dives were carried out during the week following the full moons of 15 March and 14 April 2006; and 2 April, 2 May and 1 June 2007. Multi-species coral spawning was observed during all of the months of observation except in April 2007. Across all months of observation, a total of at least 36 scleractinian species belonging to 14 genera and 7 families (Acroporidae, Mussidae, Agariciidae, Faviidae, Oculinidae, Merulinidae and Poritidae) broadcast spawned (Fig. 1), with a maximum of 13 species observed on the fifth night after full moon in May 2007. Further studies are required to establish the extent of spawning at other times of the year and the reproductive patterns of corals elsewhere in the Philippines.

Effects of the soft coral Xenia puertogalerae on the recruitment of scleractinian corals

The effects of Xenia puertogalerae on the recruitment of juvenile corals was studied at two levels, involving early and more advanced settlement stages. Inhibition by X. puertogalerae was evident. Terracotta tiles established near soft coral colonies had fewer recruits than those located away from the soft corals. This inhibitory effect may be selective as acroporids were able to settle and survive in the presence of Xenia. This selectivity in allowing recruitment implies an important role for X. puertogalerae in determining succession and community structure. It may affect community structure by favouring the establishment of tolerant species, but effectively deters settlement of other corals in the area.

Partial mortality in Porites corals: variation among Philippine reefs

Partial mortality or tissue necrosis was quantified in the massive scleractinian coral Porites at three sites in The Philippines (Bolinao, NW Luzon; Puerto Galera, Mindoro; and El Nido, N Palawan). Overall, 15 ± 1 (mean ± 1 standard error, 642 replicates) percent of colony area was dead, mean colony area was 1135 ± 127 cm 2 , and lesion density was 1.7 ± 0.1 dm ‐2 . Total live coral cover varied between 20 and 63% in belt transects, and Porites and Acropora cover were inversely correlated. ANOVA models incorporating effects of site, colony size, sedimentation rates, wave exposure and depth were highly significant but explained only a small proportion of the variation observed in lesion density and percent dead area (respectively 8 and 2%). Lesion density was found to vary significantly with site (contributed 29% to this explained variance), decrease with increasing colony area (33%), and increase with increasing sedimentation (23%) and wave exposure (14%). Colony size was significantly explained by the factor site (contributing 61% to the total 29% explained variance) and depth (34%), with the smallest colonies being observed in Bolinao and the largest in El Nido. Densities of lesions were highest in Bolinao, intermediate in Puerto Galera, and lowest in El Nido. This pattern is parallel to intensity of human reef exploitation and opposite to that in colony size, live coral cover and Acropora cover. Since only a small part of the observed variance in partial mortality estimators was explained by the ANOVAs, other factors not quantified here must have been more important (e.g. disease incidence, predation, human exploitation).