In comparison to other CARICOMP sites, the tiny island of Saba, in the Windward Islands arc of the Lesser Antilles, can be described as atypical in terms of its topography, geology, and marine environment. Saba has a small human population and anthropogenic impacts on the nearshore marine environment are limited. Sedimentation, dive tourism, and fishing are the three main impacts in coastal waters. Saba is devoid of mangrove stands; Thalassia seagrass beds and coral communities are restricted to a narrow shelf and offshore seamounts. CARICOMP sampling occurs only at one reef area on the leeward west coast. Physical oceanographic data are available for this site, and meteorological data are available for the island. Benthic composition is described based on CARICOMP surveys carried out to date and on a baseline monitoring program that was executed in 1993 as part of a study for the Saba Marine Park

Findings:

The main conclusion from this study is that at the moment tourists and locals use Lac Bay and its catchment area at levels and in ways that are not sustainable.

Recreational use:

• Recreational use is concentrated on and around the Sorobon Peninsula. The major activities are beach and sports-related (sunbathing and windsurfing). The main water based activities are windsurfing and swimming/wading.
• The social carrying capacity for the present kind of visitor and present kind of usage begins to become an issue around 250 beach visitors. Average visitor numbers on cruise days is 359 (highest is 760) and on weekends is 260.
• There is a large difference in visitor numbers between cruise days and non- cruise days, with cruise days having the highest.
• Awareness of Lac Bay’s regulations and zoning plan is low, resulting in certain activities taking place in sensitive zones.

Land use:

• Fresh water surface-flow to the bay is affected by approximately 54 dams or more, and groundwater flow by many (uncounted) wells
• 213 kunukus (farms on Bonaire) are present in Lac Bay and its catchment area.

Livestock densities within the natural areas surrounding Lac Bay are not sustainable. They exceed the ecological carrying capacity of the area.

Management Recommendations

- Develop and implement a set of measures that can be used to preserve and enhance the Lac visitor experience in accordance with social carrying capacity.

- Develop sunbathing and water sport possibilities elsewhere on Bonaire to distribute user densities from Lac Bay.

- Develop and implement a set of measures that can be used to preserve and enhance the natural values of Lac Bay.

• Improve the implementation of the zoning plan.
• Organize several facilities at Sorobon more properly.
• Create a visitor centre at Sorobon.
• Reduce livestock densities in the Lac Bay catchment area.

Key recommendations for further study:

• Research on up to what extend tourists facilities are contributing to the eutrophication at Lac.
• Research on the effect of sunscreen on coral bleaching at Lac.
• Further research to obtain a clear overview of land use in Lac’s catchment area.

The purpose of this survey was to describe and map the natural and cultural resources of the marine environment with a view to sustainable development of these resources for tourism.The following main habitat types were identified: coral-encrusted rock, true coral reefs, sand with algal beds, and artificial habitat (wreck sites). The most important areas for recreational use and further tourism development are the reef complex south of the city pier, the reefs of Jenkins Bay and the archaeological sites in Oranjebaai.
In addition to describing and mapping the resources, an inventory of uses of the marine environment was made, being fisheries, diving and snorkeling, anchoring and ship's traffic. Individual uses were mapped and these maps were overlayed to show areas of conflict between uses. The overlays formed the basis for a zoning plan for the marine environment. This plan identifies certain zones for different uses, so as to avoid conflicts between users. The zoning plan proposes two marine park
zones, two archaeological zones, a large anchorage/harbor zone, traffic zones and a fisheries management zone. Since the institutional structure for managing the marine environment and enforcing the regulations of the zoning plan is not available at present, creation of a new non-governmental body is recommended for management. All interest groups should be represented in such a body. Once the Island Government approves the recommendations and the proposed zoning plan, a detailed
project proposal and budget need to be drafted and submitted for funding.

Findings

The main issues that Lac Bay faces were identified as follows:

1. Filling-in of Lac and reduced water circulation. Over-grazing by extensive livestock husbandry as well as non-sustainable land-use practices (e.g. barren fields) has resulted in an accelerated infilling of the bay with sediment, which hampers water circulation and causes mangrove die-off. This has lead to a gradual reduction of the effective nursery and habitat surface of the bay over the last decades.
2. Increase in uncontrolled recreational pressure. The Lac ecosystem has been modified or altered by construction of roads, the building of hotels, subterraneous nutrient enrichment by untreated sewage and more. Trampling is causing an important decrease in sea grass bed coverage in the bay. Endangered species such as turtles and nesting birds are vulnerable to human disturbance (Lac is intensively used for various kinds of recreation).
3. Litter contamination. Marine litter washed in from the open ocean and abandoned fishing lines in the deeper parts of Lac are big issues.
4. Algal blooms. While the outer reef is in very good health, many of the inner reef’s corals, gorgonians and sponges are being overgrown by the crustose calcareous alga Ramicrusta sp. This may cause a serious decline in living corals inside the bay.

Management Recommendations:

The highest priority is to start habitat restoration.

Direct enforcement of existing and new legislation is crucial as well as a permanent presence of one or more officials.

Filling-in of Lac and reduced water circulation

• Tackle the livestock overgrazing problem in the whole watershed.
• Regularly open up the former channels to the rear areas of the mangroves and re-establish circulation and water quality.
• Remove filled-in sediments and reforest with red mangroves in the rear stagnant areas of Lac so as to re-establish mangrove and fish nursery habitat.

Address increase in uncontrolled recreational pressure

• Set upper limits for the various users.
• Strictly limit public access to seagrass areas using a combination of zoning, demarcation and enforcement.
• Upgrade the visitor facilities designed to limit or steer user impact towards low sensitivity areas.
• Monitor the human use of the bay.
• Assess Lac’s current bird use and their vulnerability to disturbance.

Litter contamination

• Conduct regular cleanups with volunteers and monitor litter densities.
• Limit and regulate fishing inside of Lac.
• Conduct PAH  (polyaromatic hydrocarbon) studies of the water in Lac.

Algal blooms

• Periodic annual monitoring of enteric bacterial presence at high risk locations.
• Install a monitoring program to assess the nutrient situation in Lac at several locations.
• Continue monitoring of coral overgrowth by Ramicrusta sp. 

Management Recommendations:

• To keep collecting data for long term monitoring programs. It is fundamental for the proper management of our natural resources.
• Try to recruit regular local volunteers and provide them with training until financial resources to hire professional staff are available.
• Increase the number of bird surveys as resources and trained personnel become available.
• If a third year of surveys brings again positive results consider lowering the frequency of the surveys in order to cover other species that need attention. 

Lac Bay, Bonaire is the most important mangrove and seagrass area of Bonaire and has been undergoing steady ecological decline in the last decades. Based on an initial assessment of conservation management issue and potential solutions, as, conducted by IMARES in June 2010, the Dutch Ministry of Agriculture, Nature and Food Quality (LNV) asked IMARES to return to Bonaire to work with Stinapa Bonaire to choose narrower priorities and jointly make a short-list of topics as a working document for cooperation and action. In the beginning of September, site visits and discussions were held in Bonaire with the manager of Lac Bay and various stakeholders to identify and agree on priority issues for action. This working report gives the results of that visit.

Four action spear point projects were identified, based on urgency and feasibility based on local Bonaire and Dutch IMARES expertise. The projects are as follows:

1. Mangrove restoration demonstration pilot study
The basic objective is to reestablish water depth and tidal connection in high marsh salt areas that have resulted from infilling with sediment, and restore them as effective mangrove and low marsh fish nursery habitats. By collecting baseline data before the restoration activities take place, it will be possible to monitor and compare and assess changes in fauna and flora at the restoration sites and hence evaluate the effectiveness of the measures implemented.

2. Baseline ecological study of the zonation of aquatic communities
The goal is to complete a scientific description of Lac’s aquatic community zonation as it exists at landscape level today. This will provide the framework against which large-scale community change and effectiveness of mitigation measures can be monitored and evaluated.

3. Recreational and land use survey for Lac Bay and its catchment area
The goal is to identify user problems and potential solutions by mapping and assessing user density and pressures in Lac

4. Study of avifaunal habitat use of Lac Bay
The goal is to identify bird habitat use problems and potential solutions by assessing habitat use of Lac by birds during the migratory season.

(A fifth project for implementation by Stinapa and Dienst LVV was identified)
5. Lac mangrove channel clearing project
Re-establish water flow from the Bakuna dam to Lac using a pipe system.

The Lac mangrove channel clearing project of Stinapa was reviewed and judged to be valuable and important. The baseline study of zonation of aquatic communities (project 2) is urgently needed in this respect to allow short and long-term evaluation of this project which need to become a structural part of Lac Bay management. Routine mangrove channel maintenance was identified as ideal work for involvement of Bonaire youths and volunteers, to rekindle public involvement in caring for Lac and its rich natural and cultural-historical heritage. 

Management Recommendations:

A project plan is presented by which all four projects can be delivered by December 2012. These projects can count on government and broad community support. In this all, Stinapa indicated to be willing to provide basic free lodging to interns and scientists at their science accommodations at the entrance of Washington-Slagbaai National Park. The ability and willingness of IMARES to recruit and guide students and interns for these projects was an important selection criterion to help restrain total project costs. The action spear points will, nevertheless, require funding as well as permits from the Island Government of Bonaire. With LNV various funding options were reviewed and discussed, and the need for permits was discussed with DROB (Dienst Ruimtelijke Ontwikkeling en Beheer) Bonaire. DROB envisioned few problems with the required permits. The visit was concluded by the joint resolve to work out ways to maintain momentum and proceed towards the implementation phase.

Structural change in both the habitat and reef-associated fish assemblages within spatially managed coral reefs can provide key insights into the benefits and limitations of Marine Protected Areas (MPAs). While MPA zoning effects on particular target species are well reported, we are yet to fully resolve the various affects of spatial management on the structure of coral reef communities over decadal time scales. Here, we document mixed affects of MPA zoning on fish density, biomass and species richness over the 21 years since establishment of the Saba Marine Park (SMP). Although we found significantly greater biomass and species richness of reef-associated fishes within shallow habitats (5 meters depth) closed to fishing, this did not hold for deeper (15 m) habitats, and there was a widespread decline (38% decrease) in live hard coral cover and a 68% loss of carnivorous reef fishes across all zones of the SMP from the 1990s to 2008. Given the importance of live coral for the maintenance and replenishment of reef fishes, and the likely role of chronic disturbance in driving coral decline across the region, we explore how local spatial management can help protect coral reef ecosystems within the context of large- scale environmental pressures and disturbances outside the purview of local MPA management. 

Management Recommendations:

• To keep collecting data for long term monitoring programs. It is fundamental for the proper management of our natural resources.
• Try to find permanent local volunteers to do these surveys until an adequate amount of professional staff is available.
• Provide more training for the volunteers. 

Abstract:

Marine reserves, in which exploitation of marine organisms and other human activities are restricted or prohibited, can be valuable tools for marine conservation and fisheries management. No-take marine reserves support greater density, size, and diversity of fishes than exploited areas, with most benefits accruing to heavily exploited species. Protected areas can also export biomass to sustain or increase the overall yield of adjacent fisheries. These effects can be especially significant for organisms with small home ranges, such as coral reef fish. Although there are many benefits to creating marine reserves they are also costly to manage and can infringe on people’s recreation and livelihoods. For marine reserves to be used as management tools, a comprehensive knowledge of the ecosystems is needed and reserve impacts should be regularly monitored.

St. Eustatius Marine Park and two no-take marine reserves were established by the Statian government in 1996 to promote dive tourism and sustainable fisheries. No fisheries study was carried out prior to reserve implementation to determine the status of fish stocks. In the summer of 2008, surveys were undertaken inside and outside the marine reserves to census reef fish and habitat to establish a current baseline and to evaluate the effects of the marine reserves on reef fish populations. The data that was collected was used to answer three questions about the current state of the Marine Park: 1) are there habitat related differences between reserve areas and non-reserve areas or between reef types? 2) do fish density, diversity, or biomass differ between protected and unprotected sites or between reef types? and 3) do habitat characteristics, reserve status, or reef type influence fish density, diversity, and biomass?

This study determined that habitat differences among the survey sites affected reef fish populations more than reserve status. However, the no-take reserves may still be important for protecting reef fish populations. The two reserves have been in place for more than 10 years and it is unknown what happened to fish populations during that time. Future research, employing the methods of this study, can be used to monitor reef fish populations and habitat over time to better determine if the reserves are having beneficial effects.