Benefits Of Reserves Research Articles

Marine reserves can buffer against environmental fluctuations for overexploited but not sustainably harvested fisheries.

Globally, decision-makers are seeking management levers that can mitigate the negative effects of climate change on ecosystems that have already been transformed from their natural state by the effects of fishing. An important question is whether marine reserves can provide buffering (i.e., population-level resilience) against climate disturbances to fished populations. Here, we examine one aspect of this question, by asking whether marine reserves can reduce the variability in either overall biomass or in fishery yield, in the face of environmental variability. This could happen because greater reproduction of longer-lived, larger fish inside reserves could supplement recruitment to the fished portion of the population. We addressed this question using age-structured population models, assuming a system where some proportion of the coastline is protected in marine reserves (0%-30%), and the remainder is fished (at a range of possible harvest rates). We modeled populations with sedentary adults and dispersal via a larval pool. Since recent extreme climate events (e.g., marine heatwaves) have reduced juvenile survival for some fish species, we assumed that environmental variability affected the survival of the first age class in our model. We viewed population variability as a question of buffering, measured as the proportion of time a simulated population spent below a target reference point, with the idea that marine reserves could prevent the population from reaching low levels in the face of fishing and environmental variability. We found that fisheries with more area in marine reserves always had less variability in biomass. However, adding marine reserves only reduced variability in fisheries yield when the fished part of the population was being harvested at a rate exceeding the maximum sustainable yield. This new result on reducing variability is in line with previous findings that the "spillover" effects of marine reserve benefits to fishery yields only accrue when the fishery outside reserve boundaries is being overharvested.

Effect of doping of metal salts on polymers and their applications in various fields

Abstract Transition metal compounds (TMCs) provide the benefits of vast reserves, affordability, non-toxicity, and environmental friendliness, making them highly sought-after in recent times. Integrating transition metal salts into polymers may result in substantial enhancements in optical and electrical characteristics, making them appealing for many applications. Transition metal ions may display a range of electronic transitions, which enables the adjustment of absorption and emission spectra. This characteristic has significant value in applications such as light-emitting devices (LEDs) and sensors. The photoluminescence of polymers may be improved by the addition of transition metal salts, which results in light emission that is both more brilliant and more efficient. On the other hand, this is advantageous for screens and optoelectronic devices. The presence of transition metal salts in polymers may help to improve their optical stability, hence lowering the probability that the polymers will degrade or change color over time. When it comes to the performance of optical devices over the long run, this is quite essential. Elevating the electrical conductivity of polymers is possible via the use of transition metal salts. This is very helpful in the process of developing conductive polymers for use in applications such as electronic fabrics, organic solar cells, and flexible electronic devices. Transition metal salts can affect the electrical band structure of polymers, which enables the band gap of the material to be tuned. This is very necessary in order to maximize the amount of light that is absorbed by photovoltaic devices. Through having all these benefits, we conducted a review to find out the effects on polymeric materials.

Benefits of Reservation for Persons with Disability in Education and Employment in India

Benefits of Reservation for Persons with Disability in Education and Employment in India

Development and validation of a predictive nomogram for sarcopenia among older people in China.

Development and validation of a predictive nomogram for sarcopenia among older people in China.

TOXIC STRESS, RESILIENCY RESOURCES, AND TIME TO DEMENTIA DIAGNOSIS AMONG AMERICANS AGED ≥50 YEARS IN THE HRS 2006–2016

Abstract Toxic stress (TS), resiliency-promoting factors (RPFs) and their interactions were investigated in relationship to incident dementia in a sample (n = 6516) of US adults ≥50 years old enrolled in the HRS between 2006-2016. TS included experiences of everyday discrimination and RPF included personal mastery. Race/ethnicity was self-reported as African American (AA), Caucasian, or Other. Multivariable Cox proportional hazards regression models estimated TS-, RPF- and race-associated hazard ratios (HR) for dementia diagnosis and 95% confidence intervals (CIs) with adjustment for comorbidity and socio-demographic factors. Discrimination-associated risk of dementia diagnosis on average increased with education level [discrimination x education, p = 0.032; HR = 1.75 (95% CI: 1.01–3.03) if < high school, HR = 5.67 (95% CI: 2.94–10.94) if high school completed and HR = 2.48 (95% CI: 1.53–4.00) if ≥some college education]. Likewise, AA vs. Caucasian race disparity in new-onset dementia was evident (HR = 2.12, 95% CI: 1.42–3.17) among adults with high-mastery while absent (HR = 1.35, 95% CI: 0.75–2.41) among adults with low mastery (Mastery x Race, p = 0.01). TS is a contextual driver of incident dementia that seemingly operates in a race and RPF-dependent manner. Heterogeneity pattern suggests that TS may overwhelm the cognitive reserve benefit of RPF particularly in status-inconsistent contexts including persons subjected to discrimination despite high education and in AA individuals despite high mastery. Policies that reduce discrimination and promote equitable treatment by race/ethnicity may support cognitive resiliency and reduce the risk of dementia diagnosis in adult Americans.

Molecular dynamics-based analysis of the factors influencing the CO2 replacement of methane hydrate

The benefits of large reserves, wide distribution, and high combustion energy density of natural gas hydrates are of great practical importance to alleviate the energy tension, enhance the existing energy system in China and reduce the greenhouse effect. The CO2 replacement method is a critical way to develop natural gas hydrate, while traditional experimental methods are difficult to reveal the microscopic mechanism of the replacement system. An MD (molecular dynamics) technique was utilized in this work to simulate the process of carbon dioxide replacement of gas hydrates. This simulation investigates the effects of temperature, pressure, and CO2 purity during the CO2 replacement process. CO2, different concentrations of CO2/H2O, and CO2/NH3 are used as the injected fluid. The simulation results show that the influence of temperature on the CO2 replacement of natural gas hydrate is more significant than that of pressure. Within the temperature and pressure range specified in the simulation, H2O inhibits the replacement of CO2, owing to the inhibitory effect increasing as the concentration of H2O increases; NH3 promotes the process of CO2 replacement under the temperature conditions of 250 K and 260 K, and the promotion effect becomes more significant as the concentration of NH3 increases. However, adding NH3 inhibits the CO2 replacement process with hydrate when the temperature lifts to 270 K. These findings provide new ideas to improve the efficiency of the CO2 replacement method and provide theoretical insight for the engineering exploitation of hydrates.

Reservasi secara online untuk meningkatkan hunian kamar LINK Hotel

The purpose of this study is to discuss the contribution of room reservations through online media and offline reservations to increase room occupancy and to know the implementation of room reservation systems through online media in an effort to increase room occupancy at LINK Hotel. Methods of data collection are Observation, Interview, Documentation, and literature. The analysis techniques used are statistics descriptive and descriptive qualitative. The results of this study indicate that the contribution of reservation through offline reservation and online reservation to the room occupancy during three years experienced fluctuation or unstable circumstances every month, with the average contribution of reservation through offline reservation in the year 2015 that is 6.8%, the year of 2016 that is 1, 87%, the year of 2017 that is 1.62%. And the contribution of reservations through online reservations in the year 2015 is 93,41%, in the year 2016 that is 98,13%, the year 2017 that is 98,38%. And the implementation of the room reservation system through online reservation media discusses online reservation steps, the benefits of online reservation, and how to apply online reservation maximally.

Increasing spillover enhances southern California spiny lobster catch along marine reserve borders

AbstractThe conservation benefits of marine reserves are well established but their contribution to adjacent fisheries via spillover is less certain and context‐dependent. Theoretical predictions do not always match empirical evidence from individual reserves, so carefully designed studies are essential for accurately assessing spillover and its contribution to fisheries. Biomass buildup within reserves, and spillover from reserve borders, also usually takes time to develop. In 2003, a network of no‐take marine reserves was established in the Northern Channel Islands (NCI) of southern California (CA) to conserve biodiversity and to eventually enhance local fisheries through spillover of larvae, juveniles, and adults. The reserve network impacted the local CA spiny lobster (Panulirus interruptus) fishery by removing about 20% of fishing grounds in the NCI. In 2008, a collaborative fisheries research effort detected substantial lobster population increases within reserves, and an indication of the possible spillover of adult lobsters across reserve borders. To estimate whether and how much populations within reserves, and spillover from reserves, have increased through time, we repeated the sampling program 10 years later in 2018 at two of the three original reserves. Scientific trapping was conducted prior to the fishing season along a spatial gradient beginning deep within the reserves to reference sites located outside (≥2 km) of reserve borders. Results showed that legal‐sized lobster abundance in traps (catch per unit effort) increased by 125%–465% deep inside reserves, and by 223%–331% at sites near to reserve borders, and by nearly 400% just outside of reserve borders over the 10‐year period, thus indicating a substantial increase in spillover across reserve borders. A similar pattern was observed in lobster biomass caught in traps at the two reserves. This study demonstrates how spillover scales with biomass buildup and that collaborative fisheries research can be used to assess the efficacy of marine reserves as fishery management tools worldwide.

Ecotourism risk assessment in Yaoluoping Nature Reserve, Anhui, China based on GIS

As tourism development and human disturbance increase, they have been affecting the functional structure distribution, sustainable utilization of resources, and ecological benefits of nature reserves. At the same time, ecological risk has increased significantly. This study proposes ecotourism development patterns for risk areas at each level, to provide a basis for stabilizing and promoting the ecological sustainable development of nature reserves. Yaoluoping National Nature Reserve in China is used as a study case. Based on GaoFen-2 satellite data within the reserve area in 2017, ENVI, Fragstats and ArcGIS10.2 are used for land use classification as well as evaluation indicators selection and analysis. The ecotourism risk assessment model of the reserve is constructed, which is also imbedded with analytic hierarchy process and Ecological Risk Index. The model consists of landscape ecology, topographic hydrology, land use and human activities factors, and it can produce the distribution map at the ecotourism risk level of the reserve. Results show that the high ecotourism risk areas in the reserve are mainly located around rivers and roads, and they are distributed in strips. Overall, the ecotourism risk level in the northern part of the reserve is higher than that in the southern part. Nearly 90% of the regional ecotourism risk is at the middle or low level, implying the reserve in a healthy level overall. However, except for low-risk areas, the proportion of risk areas at all levels in the core zone is higher than that in the buffer zone.

Toxic Psychosocial Stress, Resiliency Resources and Time to Dementia Diagnosis in a Nationally Representative Sample of Older Americans in the Health and Retirement Study from 2006-2016.

Background: Toxic stress (TS), resiliency-promoting factors (RPFs) and their interactions were investigated in relationship to incident dementia in a nationally representative sample (n = 6516) of American adults ≥50 years enrolled in the Health and Retirement Study between 2006 and 2016. Methods: TS included experiences of everyday discrimination and RPF included personal mastery. Race/ethnicity was self-reported as African American, Caucasian, or Other. Multivariable Cox proportional hazards regression models estimated TS-, RPF- and race-associated hazard ratios (HR) for dementia diagnosis and 95% confidence intervals (CIs) with adjustment for comorbidity, lifestyle, and socio-demographic confounders. Results: Discrimination-associated risk of dementia diagnosis on average increased with education level [discrimination x education, p = 0.032; HR = 1.75 (95% CI: 1.01–3.03) if < high school, HR = 5.67 (95% CI: 2.94–10.94) if high school completed and HR = 2.48 (95% CI: 1.53–4.00) if ≥some college education]. Likewise, African American vs. Caucasian race disparity in new-onset dementia was evident (HR = 2.12, 95% CI: 1.42–3.17) among adults with high-mastery while absent (HR = 1.35, 95% CI: 0.75–2.41) among adults with low mastery (Mastery x Race, p = 0.01). Conclusions: TS is a contextual driver of incident dementia that seemingly operates in a race and RPF-dependent fashion among American adults. Association pattern suggests that TS may overwhelm the cognitive reserve benefit of RPF particularly in status-inconsistent contexts including persons subjected to discrimination despite high education and persons of African American descent despite high mastery. Policies that reduce discrimination and promote equitable treatment by race/ethnicity may support cognitive resiliency and reduce the risk of dementia diagnosis in adult Americans.

Transient perturbations reveal distinct strategies for reserve benefits in life history-dependent ecosystems

Marine reserves can improve fisheries yields of target species while maintaining the persistence of bycatch species. However, the prevalent equilibrium analyses prevent our understandings in transient behaviours to achieve fisheries adaptive management. By incorporating age structure, we develop high-dimensional theoretical frameworks including both target and bycatch species to compare the yields of target species under different fisheries management strategies. With practical applications to the West Coast groundfish fishery in the USA, our research suggests that strategies with reserves can perform more benefits than traditional strategies without reserves in both conservation and fisheries aspects if target species have old ages at maturity and low adult survivorships. In addition, if fisheries yields are measured by weight, fisheries management has multiple choices over short time scales, which is contrary to the conclusions when yields are measured by numbers. The generality of applying our theoretical frameworks to fisheries management is tested with hypothetical parameters. Our work can be used to choose suitable measurement metrics and design more precise optimal fisheries strategies for given natural systems with specific life histories.

Policy Forum: Establishing an Urban Reserve—Property Tax Challenges and Opportunities

Urban reserves offer a unique economic development tool for First Nation governments by providing access to markets and infrastructure unavailable on most reserve lands in Canada. Asimakiniseekan Askiy is Canada's first urban reserve established on land previously owned by a city. The urban reserve was established in Saskatoon by the Muskeg Lake Cree Nation in 1988. Asimakiniseekan Askiy provides an example of the economic potential of urban reserves for First Nations and their members, as well as municipal governments and their citizens. The urban reserve is currently home to 60 First Nation and non-First Nation businesses and their 700 employees. In 2020, the urban reserve contributed $465,662 to the city of Saskatoon in service fee payments. However, before this economic potential could be realized, property taxation presented a sizable barrier in the path of taking Asimakiniseekan Askiy from an innovative idea to a successful reality. Establishing an urban reserve has significant property tax implications, since the process requires the transfer of property from the taxing authority of a municipal jurisdiction to the tax jurisdiction of a First Nation government. Agreements providing for the transfer of tax authority also include negotiations relating to the continued provision of services to the urban reserve by the municipality. This article first provides a summary of the statutory environment surrounding the formation and taxation of an urban reserve. A case study of the establishment and 33 years of operation of Asimakiniseekan Askiy is then provided, to illustrate the property tax implications and municipal service agreement process necessary for Canadian communities to achieve the economic benefits of urban reserves. The authors identify property tax challenges inherent in the establishment of an urban reserve and offer recommendations to improve access to urban reserves as an innovative economic development tool.

Economic valuation of the snapper recruitment effect from a well-established temperate no-take marine reserve on adjacent fisheries

The global exhaustion of marine fishery resources has triggered worldwide demands for sustainable utilization of marine resources and Ecosystem-Based Management (EBM). Marine Protected Areas (MPAs) are a long-term spatial management strategy in the EBM toolbox. MPAs demonstrate ecological and economic benefits. While MPAs’ ecological benefits are well researched, there are only a few studies that estimate the economic benefits of MPAs to the adjacent fisheries. Currently, methodologies for measuring the economic benefits flowing from MPAs are underdeveloped. Our research builds on a recent assessment of the economic contribution of a small, temperate, no-take marine reserve in New Zealand to rejuvenating depleted snapper (Sparidae: Chrysophrys auratus) stocks. Empirical evidence shows that 10.6% of newly settled juvenile snappers sampled up to 55 km outside of the MPA were the offspring of adult snappers from the MPA. This suggests a significant boost to the commercial fishery of $NZ 1.49 million catch landing value per annum and $NZ 3.21 million added from recreational fishing activity associated spending per annum. These values all come from the recruitment effects associated with one species, from only 0.08% of the marine space in the Hauraki Gulf, New Zealand. The economic valuation of this marine reserve’s snapper recruitment effect demonstrated $NZ 9.64 million in total spending accruing to recreational fishing per annum and $NZ 4.89 million in total output to commercial fisheries annually. This study is the first estimation of the economic valuation of the recruitment effects from a well-established temperate no-take MPA. It represents an important step forward for quantifying the economic benefits of marine reserves and how marine reserves could have positive influence on EBM and marine sustainability.

Increased connectivity and depth improve the effectiveness of marine reserves.

Marine reserves are a key tool for the conservation of marine biodiversity, yet only ~2.5% of the world's oceans are protected. The integration of marine reserves into connected networks representing all habitats has been encouraged by international agreements, yet the benefits of this design has not been tested empirically. Australia has one of the largest systems of marine reserves, providing a rare opportunity to assess how connectivity influences conservation success. An Australia‐wide dataset was collected using baited remote underwater video systems deployed across a depth range from 0 to 100 m to assess the effectiveness of marine reserves for protecting teleosts subject to commercial and recreational fishing. A meta‐analytical comparison of 73 fished species within 91 marine reserves found that, on average, marine reserves had 28% greater abundance and 53% greater biomass of fished species compared to adjacent areas open to fishing. However, benefits of protection were not observed across all reserves (heterogeneity), so full subsets generalized additive modelling was used to consider factors that influence marine reserve effectiveness, including distance‐based and ecological metrics of connectivity among reserves. Our results suggest that increased connectivity and depth improve the aforementioned marine reserve benefits and that these factors should be considered to optimize such benefits over time. We provide important guidance on factors to consider when implementing marine reserves for the purpose of increasing the abundance and size of fished species, given the expected increase in coverage globally. We show that marine reserves that are highly protected (no‐take) and designed to optimize connectivity, size and depth range can provide an effective conservation strategy for fished species in temperate and tropical waters within an overarching marine biodiversity conservation framework.

The Problem of the Legal Consequences of Reservations Incompatible with the Object and Purpose of the Treaty

This research aims to address the problem of the legal consequences of reservations incompatible with the object and purpose of the treaty according to Article 19(c) of the Vienna Convention on the Law of Treaties 1969 (VCLT). As there exist no provisions in the VCLT that indicate the legal consequences of reservations incompatible with the object and purpose of the treaty, this raises issues of the vagueness and uncertainty of the legal consequences of the incompatibility between a reservation and the object and purpose of the treaty. The legal consequences of reservations incompatible with the object and purpose of a treaty must be addressed in two dimensions. The first dimension is the determination of the legal consequence of a reservation which is incompatible with the object and purpose of a treaty. The second dimension is the consequences of the state consent to be bound by a treaty given by a reserving state with which a problematic reservation is attached. Whilst the legal consequence of a reservation itself is less problematic, as it has been well settled that the reservation prohibited by 19(c) is invalid and produces no legal effects, the legal consequence of the consent to be bound by a treaty of a reserving state is still an unsolved riddle. Academically, three proposals —the surgical approach, the backlash approach, and the severability approach — are put forward to serve as a proper threshold for determining the legal consequence of the consent of a reserving state which has made a reservation which is incompatible with the purpose and object of a treaty. First, according to the surgical approach, the incompatibility of a reservation with the object and purpose of a treaty invalidates the reservation itself; moreover, the invalidity of the reservation has a further consequence that the provisions, the effect of which an incompatible reservation purports to exclude or modify, will not apply to a reserving state. Second, the backlash approach construes the legal consequence of the incompatibility of a reservation with the object and purpose of the treaty as invalidity of both the incompatible reservation and the consent of a reserving state excluding a reserving state from the membership of the treaty. Third, pursuant to the severability approach, invalid reservations are severable from the instrument of the consent of a state and a reserving state is still regarded as a party to a treaty without being able to take the benefits of an invalid reservation. By examining the three approaches, the research argues that none of the three by itself can serve as a proper criterion to determine the legal consequence of incompatibility between a reservation and the object and purpose of the treaty on the consent of a reserving state. However, it is proposed by this research that the hybrid model based on the essentiality of a reservation to the consent of a reserving state which compromises between the backlash approach and the severability approach can serve as the solution to this issue. In order to deal with legal uncertainty caused by the essentiality criterion of the hybrid model, it is a recommendation of the research that the clause on the rebuttable presumption of severability should be incorporated into a treaty which will be helpful in cases where states fail to express to make a clear intention to be bound or not by a treaty in case of a reservation is considered invalid. Nevertheless, the suggestion of the ILC in its Guide to Practice on Reservations that a reserving state is allowed to express its intention not to be bound by the treaty in case of invalidity of its reservation after the formulation of the reservation is rejected by this research due to a problem of legal uncertainty it may potentially cause. This research is submitted to and sponsored by the Research Promotion Committee, Faculty of Law, Thammasat University.

Marine reserve benefits and recreational fishing yields: The winners and the losers.

Marine reserves constitute effective tools for preserving fish stocks and associated human benefits. However, not all reserves perform equally, and predicting the response of marine communities to management actions in the long run is challenging. Our decadal-scale survey of recreational fishing yields at France's 45-year old Cerbère-Banyuls marine reserve indicated significant protection benefits, with 40-50% higher fishing yields per unit effort in the partial-protection zone of the reserve (where fishing is permitted but at a lower level) than in surrounding non-reserve areas. Over the period 2005-2014, catch per unit effort (CPUE) declined both inside and outside the reserve, while weight per unit effort (WPUE) increased by 131% inside and decreased by 60% outside. Different CPUE and WPUE trajectories among fish families indicated changing catch assemblages, with yields increasing for the family most valued by fisheries, Sparidae (the ecological winners). However, reserve benefits were restricted to off-shore fishermen (the social winners), as on-shore yields were ~4 times lower and declining, even inside the reserve. Our study illustrates how surveys of recreational fishing yields can help evaluate the effectiveness of marine protected areas for key social and ecological protagonists. We show that, more than four decades after its establishment, fishing efficiencies at the historical Cerbère-Banyuls marine reserve are still changing, but benefits in terms of catch abundance, weight, and composition remain predominantly restricted to off-shore fishermen. Further regulations appear necessary to guarantee that conservation strategies equitably benefit societal groups.

Beyond protection: Fisheries co-benefits of no-take marine reserves

Overfishing and other anthropogenic impacts to ocean ecosystems have motivated widespread implementation of no-take marine reserves to protect biodiversity and fished resources. Fully protected marine reserves now comprise approximately 2.5% of the ocean and calls for enhanced protections abound. The benefits to marine biodiversity within reserve borders are clear, yet the contributions beyond borders remain the subject of continued scholarship. In this article, six co-benefits of marine reserves for fisheries are explored. Broadly, the six co-benefits fall within two categories 1) use of reserves as tools to adaptively learn, promote resiliency, and manage marine resources, especially in the face of a changing climate and 2) use of reserves to provide credit against uncertainty in management and sustainability criteria. Broader understanding and consideration of the benefits of marine reserves can further policy discussions and deepen conversations regarding social, ecological, and economic tradeoffs of implementing marine reserves.

The Status of Muslim Women in Higher Education in the Post-Sachar Scenario: Initiatives, Achievements and Challenges

The government must provide a platform for equitable a participation and inclusive growth. First of all, creating sufficient awareness about various existing facilities, schemes and programmes is very important. Affirmative action to address the serious issue needs to be undertaken. Considering the gravity of the situation, a Constitution amendment may become necessary to provide justice to the religious minorities who are suffering because of the constitutional discrimination against them. Muslims being as backward as SCs/ STs are not getting the benefits of reservation simply because of their religious identity. The present paper The Status of Muslim Women in Higher Education in the Post-Sachar Scenario: Initiatives, Achievements and Challenges argues that this issue needs to be given due consideration so that reservation can be extended to Muslims like any other community.

Stochastic reserve scheduling of energy storage system in energy and reserve markets

Energy storage systems (ESSs) can be used to participate in both the energy and reserve markets to maximize their reserve benefits. In contrast to traditional thermal units, ESSs have three statuses: charging status, discharging status, and idling status. The energy-limited feature of ESSs makes it difficult to schedule the reserve in the joint energy and reserve markets. In this paper, a detailed energy and reserve model of ESSs is considered in the joint stochastic day-ahead unit commitment model. The main highlights of this paper are the reserve model of ESSs. Compared to existing studies, a proposed six-mode hourly power reserve model of ESSs can schedule more reserve amount to participate in the reserve market. The six reserve modes include more charging/discharging, less charging/discharging, and switch from another status to charging/discharging. Besides, multi-hour coupled reserve constraints are introduced to avoid ESSs failures to provide the reserves scheduled in the day-ahead market. Considering the uncertainty of demand and renewable generation, a scenario-based stochastic model is adopted to calculate both the energy and reserve costs of the whole system. Two different systems are used to discuss the benefits of the proposed reserve model and analysis on some crucial parameters.

Fishery management and spatial variation of giant clam stocks: lessons from New Caledonia

Giant clams have been over-exploited throughout their wide geographical range in the Indo-Pacific. Marine reserves could be one tool to potentially safeguard broodstock, but their effect on giant clam abundance and the differential benefits of lagoon reserves compared to barrier reef reserves is still unclear. We assessed abundances of four species of giant clams across 20 barrier reef and 30 lagoon reef sites across 600 km of coastline in New Caledonia using stratified underwater visual censuses. Tridacna maxima was the most common species. T. derasa was significantly more abundant in marine reserves than at sites open to fishing, but there was no effect of marine reserves on total abundance pooled across the four species. T. squamosa was significantly more abundant on barrier reefs, while Hippopus hippopus was found solely on lagoon reefs. National data from fisher logbooks shows a marked reduction in commercial catches of giant clam following implementation of daily catch limits of 5 giant clams per vessel per trip. Despite small daily bag limits of 2 giant clams per recreational fisher per trip, the recreational catch appears to be significant and much greater than the commercial catch. The utility of marine reserves on giant clams appears to be species specific, and might be diminished for the group as a whole by the concomitant protection of their natural predators. Both lagoon and barrier reef sites should be included in reserve networks. Our data suggest that daily boat/trip limits are an effective output control, at least for commercial fishers, but might not safeguard giant clams if recreational fishers are numerous. Further fishery restrictions on the less common species might be needed to ensure their persistence in the Indo-Pacific.