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612 result(s) for "Hamilton, Richard J."
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A cultural landscape approach to community-based conservation in Solomon Islands
International environmental organizations have an increasing commitment to the development of conservation programs in high-diversity regions where indigenous communities maintain customary rights to their lands and seas. A major challenge that these programs face is the alignment of international conservation values with those of the indigenous communities whose cooperation and support are vital. International environmental organizations are focused on biodiversity conservation, but local communities often have a different range of concerns and interests, only some of which relate to biodiversity. One solution to this problem involves adoption of a cultural landscape approach as the ethical and organizational foundation of the conservation program. In our conservation work in coastal Melanesia, we have developed a cultural landscape approach that involves the construction of a conceptual model of environment that reflects the indigenous perceptions of landscape. This model incorporates cultural, ideational, and spiritual values alongside other ecosystem services and underpins the conservation activities, priorities, and organizational structure of our programs. This cultural landscape model was a reaction to a survey of environmental values conducted by our team in which Solomon Islanders reported far greater interest in conserving cultural heritage sites than any other ecosystem resources. This caused a radical rethinking of community-based conservation programs. The methodologies we adopted are derived from the fields of archaeology and historical anthropology, in which there is an established practice of working through research problems within the framework of indigenous concepts of, and relationship to, landscape. In our work in Isabel Province, Solomon Islands, coastal communities have enthusiastically adopted conservation programs that are based on cultural landscape models that recognize indigenous values. A particularly useful tool is the Cultural Heritage Module, which identifies cultural heritage sites that become targets of conservation management and that are used as part of a holistic framework for thinking about broader conservation values.
Solomon Islands Largest Hawksbill Turtle Rookery Shows Signs of Recovery after 150 Years of Excessive Exploitation
The largest rookery for hawksbill turtles in the oceanic South Pacific is the Arnavon Islands, which are located in the Manning Strait between Isabel and Choiseul Province, Solomon Islands. The history of this rookery is one of overexploitation, conflict and violence. Throughout the 1800s Roviana headhunters from New Georgia repeatedly raided the Manning Strait to collect hawksbill shell which they traded with European whalers. By the 1970s the Arnavons hawksbill population was in severe decline and the national government intervened, declaring the Arnavons a sanctuary in 1976. But this government led initiative was short lived, with traditional owners burning down the government infrastructure and resuming intensive harvesting in 1982. In 1991 routine beach monitoring and turtle tagging commenced at the Arnavons along with extensive community consultations regarding the islands' future, and in 1995 the Arnavon Community Marine Conservation Area (ACMCA) was established. Around the same time national legislation banning the sale of all turtle products was passed. This paper represents the first analysis of data from 4536 beach surveys and 845 individual turtle tagging histories obtained from the Arnavons between 1991-2012. Our results and the results of others, reveal that many of the hawksbill turtles that nest at the ACMCA forage in distant Australian waters, and that nesting on the Arnavons occurs throughout the year with peak nesting activity coinciding with the austral winter. Our results also provide the first known evidence of recovery for a western pacific hawksbill rookery, with the number of nests laid at the ACMCA and the remigration rates of turtles doubling since the establishment of the ACMCA in 1995. The Arnavons case study provides an example of how changes in policy, inclusive community-based management and long term commitment can turn the tide for one of the most charismatic and endangered species on our planet.
Severe Hyponatremia and Syndrome of Inappropriate Antidiuretic Hormone Secretion After Kambô Ritual
Kambô poisoning can cause severe hyponatremia, neurologic effects, and gastrointestinal symptoms. Clinicians need to determine whether the derangements are the result of ritualistic consumption of water or toxin‐induced syndrome of inappropriate antidiuretic hormone secretion (SIADH). An appropriate workup for SIADH guides electrolyte correction and leads to resolution of neurologic and systemic effects.
Community-based management fails to halt declines of bumphead parrotfish and humphead wrasse in Roviana Lagoon, Solomon Islands
Community-based fisheries management that integrates local knowledge and existing user rights is often seen as a solution to the failures of top-down fisheries management in the Pacific. In Roviana Lagoon, Western Solomon Islands, a network of community-based marine protected areas (MPAs) was established in the early 2000s to conserve declining populations of bumphead parrotfish (Bolbometopon muricatum) and other locally valuable fish species such as humphead wrasse (Cheilinus undulatus). We aimed to evaluate the success of these protected areas at preventing declines of B. muricatum and C. undulatus. We conducted 27 underwater visual census (UVC) surveys at permanent passage and outer reef monitoring sites in Roviana Lagoon in 2018 and compared our findings with results from 72 UVC surveys that we had conducted at the same sites 18 yrs earlier. We also interviewed Roviana spearfishers about their maximum nightly B. muricatum catches from 2018, the early 2000s and the 1980s. Abundances of all B. muricatum and C. undulatus sighted on UVC surveys declined by 62% and 57%, respectively, between 2000 and 2018, and abundances of adult B. muricatum and C. undulatus declined by 78% and 72%, respectively, over the same period. Using a joint model of B. muricatum abundance and its reported maximum catch, we estimated that in 2018 the population of B. muricatum was 8% of its 1980’s abundance. By modelling projected rates of decline over three generations, we show that populations of B. muricatum and C. undulatus in Roviana Lagoon meet the IUCN Red List thresholds for Critically Endangered (CR). The probable causes of these declines are sustained fishing pressure, poor enforcement of community-based management measures and loss of fish nursery habitats due to logging. Our findings suggest urgent co-management of the ridge-to-reef system is needed to prevent further fish population declines in Roviana Lagoon.
Estimating the footprint of pollution on coral reefs with models of species turnover
Ecological communities typically change along gradients of human impact, although it is difficult to estimate the footprint of impacts for diffuse threats such as pollution. We developed a joint model (i.e., one that includes multiple species and their interactions with each other and environmental covariates) of benthic habitats on lagoonal coral reefs and used it to infer change in benthic composition along a gradient of distance from logging operations. The model estimated both changes in abundances of benthic groups and their compositional turnover, a type of beta diversity. We used the model to predict the footprint of turbidity impacts from past and recent logging. Benthic communities far from logging were dominated by branching corals, whereas communities close to logging had higher cover of dead coral, massive corals, and soft sediment. Recent impacts were predicted to be small relative to the extensive impacts of past logging because recent logging has occurred far from lagoonal reefs. Our model can be used more generally to estimate the footprint of human impacts on ecosystems and evaluate the benefits of conservation actions for ecosystems. Las comunidades ecológicas cambian generalmente a lo largo de gradientes de impacto humano, aunque es difícil estimar la huella de los impactos para dispersar amenazas como la contaminación. Desarrollamos un modelo conjunto (es decir,uno que incluye múltiples especies y sus interacciones unas con otras y covariantes ambientales) de hábitats bénticos en los arrecifes lagunares y lo usamos para inferir los cambios en la composición béntica a través de un gradiente de distancia desde puntos de explotación forestal El modelo estimó tanto los cambios en abundancia de los grupos bénticos como su recambio en la composición, un tipo de diversidad beta. Usamos el modelo para pronosticar la huella de los impactos de turbidez de actividades de explotación forestal pasada y reciente. Las comunidades bénticas alejadas de la explotación forestal estuvieron dominadas por corales ramificados,mientras que las comunidades cercanas a la explotación forestal tuvieron una mayor cobertura de coral muerto, corales masivos y sedimento suave. Se pronosticó que los impactos recientes serían pequeños en relación a los impactos extensos de la explotación forestal pasada porque las actividades recientes de explotación forestal han ocurrido lejos de los arrecifes lagunares. Nuestro modelo puede usarse de manera más general para estimar la huella de los impactos humanos sobre los ecosistemas y para evaluar los beneficios de las acciones de conservación para los ecosistemas.
Educational Interventions for Refugee Children
How can schools best prepare themselves to successfully educate refugee children? By focusing on the education of refugee children, this book takes a rare look at a subject of increasing significance in current educational spheres. Highlighting the many difficulties facing refugee children, the editors draw upon a wealth of international experience and resources to present a broad, informative and sensitive text. Educational Interventions for Refugee Children identifies school-based interventions, whilst suggesting methods and measures with which to assess the efficacy of such programmes. It also develops a useful model that provides a standard for assessing refugee experience, offering diagnostic indicators for: * Evaluating support services for refugee children * Future avenues of research * Practical implications of creating supportive educational environments for refugee children The need to identify and prepare for the education of refugee children is an international issue, and this is reflected in the broad outlook and appeal of this book. The editors have developed an overall model of refugee experience, integrating psychological, cultural and educational perspectives, which researchers, practitioners and policy makers in education will find invaluable. Dr Richard Hamilton and Professor Dennis Moore are co-directors of the Research Centre for Interventions in Teaching and Learning at the University of Auckland.
A guide to modelling priorities for managing land-based impacts on coastal ecosystems
Pollution from land‐based run‐off threatens coastal ecosystems and the services they provide, detrimentally affecting the livelihoods of millions people on the world's coasts. Planning for linkages among terrestrial, freshwater and marine ecosystems can help managers mitigate the impacts of land‐use change on water quality and coastal ecosystem services. We examine the approaches used for land‐sea planning, with particular focus on the models currently used to estimate the impacts of land‐use change on water quality and fisheries. Our findings could also be applied to other ecosystem services. This Review encompasses modelling of: large scale drivers of land‐use change; local activities that cause such change; run‐off, dispersal and transformation of pollutants in the coastal ocean; ecological responses to pollutants; socio‐economic responses to ecological change; and finally, the design of a planning response. We find that there is a disconnect between the dynamical models that can be used to link land to sea processes and the simple tools that are typically used to inform planning. This disconnect may weaken the robustness of plans to manage dynamic processes. Land‐sea planning is highly interdisciplinary, making the development of effective plans a challenge for small teams of managers and decision makers. Synthesis and applications. We propose some guiding principles for where and how dynamic land‐sea connections can most effectively be built into planning tools. Tools that can capture pertinent processes are needed, but they must be simple enough to be implemented in regions with limited resources for collecting data, developing models and developing integrated land‐sea plans. We propose some guiding principles for where and how dynamic land‐sea connections can most effectively be built into planning tools. Tools that can capture pertinent processes are needed, but they must be simple enough to be implemented in regions with limited resources for collecting data, developing models and developing integrated land‐sea plans.
Hyperstability masks declines in bumphead parrotfish (Bolbometopon muricatum) populations
Bolbometopon muricatum , the largest species of parrotfish, is a functionally important species that is characterised by the formation of aggregations for foraging, reproductive, and sleeping behaviours. Aggregations are restricted to shallow reef habitats, the locations of which are often known to local fishers. Bolbometopon muricatum fisheries are therefore vulnerable to overfishing and are likely to exhibit hyperstability, the maintenance of high catch per unit effort (CPUE) while population abundance declines. In this study, we provide a clear demonstration of hyperstable dynamics in a commercial B. muricatum fishery in Isabel Province, Solomon Islands. Initially, we used participatory mapping to demarcate the Kia fishing grounds into nine zones that had experienced different historic levels of fishing pressure. We then conducted comprehensive underwater visual census (UVC) and CPUE surveys across these zones over a 21-month period in 2012–2013. The individual sites for replicate UVC surveys were selected using a generalised random tessellation stratified variable probability design, while CPUE surveys involved trained provincial fisheries officers and local spearfishers. A comparison of fishery-independent abundance data and fishery-dependent CPUE data indicate extreme hyperstability, with CPUE maintained as B. muricatum abundance declines towards zero. Hyperstability may explain the sudden collapses of many B. muricatum spear fisheries across the Pacific and highlights the limitations of using data-poor fisheries assessment methods to evaluate the status of commercially valuable coral reef fishes that form predicable aggregations.
The world’s largest parrotfish has slow growth and a complex reproductive ecology
The bumphead parrotfish (Bolbometopon muricatum) is an iconic coral reef species of commercial, subsistence, and cultural value that has faced severe declines across the Indo-Pacific. In this study, we summarized the age-based biological characteristics of B. muricatum based on comprehensive surveys of a small-scale but high-yield fishery in Solomon Islands. We examined the full breadth of the life history, including pelagic larval duration, growth patterns throughout the ontogeny (post-settlement, juvenile, and adult), life span, mortality, age at maturity, and reproductive timing, as well as the size-dependent relative contribution of females to overall reproductive effort. The age-based demographic information supports a sexual pattern of functional gonochorism, whereby sex ratios were consistent throughout the lifespan. After a 25-day pelagic larval duration, the species growth pattern is comparatively slow and differs by sex, where males generally reach larger sizes at a given age than females. This growth pattern is associated with a long life span (at least 30 yrs) and low mortality rates (< 0.2 yr−1). Annual and lunar tracking of ovary weights confirmed cyclical spawning activity synchronized just prior to new moon throughout the year. Surprisingly, ovary weights declined in the largest and oldest females, implying lower reproductive output. Instead, lower ovary weights may reflect alternative mating strategies among the largest females whereby spawning frequency and strategy differs among females of different body sizes. These results highlight several novel and previously unknown aspects of this species’ biology, and our analyses generate information that can strengthen population models, facilitate stock assessments, support regional management, and provide a baseline for comparative work.
Integrating indigenous ecological knowledge and customary sea tenure with marine and social science for conservation of bumphead parrotfish (Bolbometopon muricatum) in the Roviana Lagoon, Solomon Islands
Indigenous ecological knowledge and customary sea tenure may be integrated with marine and social science to conserve the bumphead parrotfish (Bolbometopon muricatum) in the Roviana Lagoon, Western Solomon Islands. Three aspects of indigenous ecological knowledge in Roviana were identified as most relevant for the management and conservation of bumphead parrotfish, and studied through a combination of marine science and anthropological methods. These were (1) local claims that fishing pressure has had a significant impact on bumphead parrotfish populations in the Roviana Lagoon; (2) the claim that only small bumphead parrotfish were ever seen or captured in the inner lagoon and that very small fish were restricted to specific shallow inner-lagoon nursery regions; and (3) assertions made by local divers that bumphead parrotfish predominantly aggregated at night around the new moon period and that catches were highest at that time. The research supported claims (1) and (2), but did not support proposition (3). Although the people of the Roviana Lagoon had similar conceptions about their entitlement rights to sea space, there were marked differences among regional villages in their opinions regarding governance and actual operational rules of management in the Lagoon. Contemporary differences in management strategies resulted from people's historical and spatial patterns of settlement across the landscape and adjoining seascapes, and the attendant impact of these patterns on property relations. This was crucial in distinguishing between those villages that held secure tenure over their contiguous sea estates from those that did not. Indigenous ecological knowledge served to (1) verify that the bumphead parrotfish was a species in urgent need of protection; (2) explain how different habitats structured the size distribution of bumphead parrotfish; (3) identify sensitive locations and habitats in need of protection; and (4) explain the effect of lunar periodicity on bumphead parrotfish behaviour and catch rates. Secure customary sea tenure identified locations best suited to bumphead parrotfish management programmes, with a greater likelihood for local participation and programme success. The information was used to establish two marine protected areas in the region for bumphead parrotfish conservation.