Current Management Scenarios Research Articles

Selectivity-based management for reversing overexploitation of demersal fisheries in North-western Mediterranean Sea

Bottom trawling in the Mediterranean Sea has compromised the availability of demersal fishery resources, primarily due to decades of overexploitation beyond sustainability thresholds. Low selective bottom trawl nets have exacerbated this situation by catching large numbers of under-sized or immature individuals of targeted and not-targeted commercial species that are subsequently discarded. EU legislation requires EU Mediterranean countries to recover demersal fish stocks to sustainable levels by January 2025. This is a challenging requirement under current management scenarios that mainly focus on reducing fishing hours, compromising the activity of the fleets. While social networks among fishing fleets and fisherman associations are essential for facilitating the transition to sustainable exploitation, improving the selectivity of bottom trawl gears is proposed as a viable option beyond reducing fishing hours. This study presents the benefits of improving bottom trawlers net selectivity in multi-species NW Mediterranean coastal and deep-sea fisheries to reduce the catch of non-commercial sizes and discards. Data from selectivity experiments and literature review, fish market landings and a regional monitoring program in the FAO geographical sub-area 6 were used. Results indicate that in the short term, enhanced selectivity leads to an increase in the proportion of fish that are closer to their minimum conservation reference sizes or sizes at maturity, while minimising the impact on commercial catches. Sustainability may be achieved, though beyond 2025, with measures complementing selectivity. These include the adoption of semi-pelagic otter doors to mitigate the impact of trawlers on the seabed and the expansion of no-take marine reserves to ensure habitat recovery and spillover effects.

Management of Pustular Psoriasis; The Way Ahead.

Pustular psoriasis is a specialized variant of psoriasis which can be life threatening if not treated at the earliest. The pathogenesis has been recently linked to the role of interleukin 36. Apart from the corticosteroids, systemic antipsoriatics like acitretin, cyclosporine and methotrexate have been used with some success though unpredictable. With recent identification of role of IL-36 in the pathogenesis of pustular psoriasis, biologics targeting the IL-36 receptors have been used to manage the situation with high degree of success. This narrative review deals with the recent concepts of pathogenesis of pustular psoriasis as well as the current management scenario.

Life cycle assessment of agave bagasse management strategies: PLA biocomposites versus conventional waste disposal practices

Tequila production is one of Mexico's largest agro-industries, generating significant amounts of agave bagasse (AB) as its primary solid waste. Current AB management practices encompass composting, open dumps, and incineration. Life cycle analysis was developed to compare the environmental impact of these management scenarios with developing value-added agave fiber (AF) reinforced plastic biocomposites and generating biogas through anaerobic digestion. The assessment compares three molding methods for the PLA-AF biocomposite, with the environmental impact evaluated against pure PLA and low-density polyethylene (LDPE). Extrusion-injection molding was the most environmentally friendly molding method across all indicators, primarily due to the reduced inputs required for pretreating the fibers. Among the current management scenarios, composting was the least environmentally impactful for the global warming potential indicator. Nonetheless, composting requires substantial time and land use, posing challenges for some producers. Incineration displayed a significant trade-off on the fossil resource scarcity indicator by replacing natural gas. Anaerobic digestion displayed high impacts in all indicators as AB does not yield high methane potential. While the production of PLA-AF displays a significantly higher environmental impact, it remains a preferable option when compared to pure PLA and may further improve its sustainability through green chemistry principles. Notably, LDPE was less environmentally impactful than both bioplastic options assessed, due to the environmental impacts of PLA production and the widespread standardization of LDPE production processes. Context-specificity is critical to assess the environmental impact of circular bioeconomy pathways, which are not always inherently beneficial, while addressing SDG 12: Responsible Consumption and Production.

Advances in Management of Ovarian Cancer through Natural Resources: An Update

Since times immemorial, mankind has been dependent on Mother Nature in terms of natural resources for alleviating its sufferings. As per W.H.O., developing countries should fully explore their flora and fauna to become economically self-reliant. Country India enjoys having diverse climatic conditions of heavy rainfall, sandy deserts & snow-clad mountains, which play a perfect condition and host for the growth of plenty of medicinal plants with desirable phytoconstituents. Presently mankind is suffering from many diseases that were not so common in the olden days. Does it is a signal from our mother Nature to once again rediscover its treasure of natural resources for exploring answers for various prophylaxis and therapeutic needs of modern-day disorders and diseases? Cancer is the most fatal disease worldwide caused due to the uncontrolled growth of abnormal cells in the body. Ovarian Cancer is the fifth leading cause of death in females. The incidence and mortality rate of Ovarian Cancer is increasing day by day across the world. Biomarkers such as CA125, HE4, OVA1, and Cancer stem cells have been used for the detection of Ovarian Cancer. The current treatment of Ovarian Cancer is surgery and some common treatments include chemotherapy, radiation therapy, adoptive cell therapy, use of medicinal plants and their derivatives. Some prominent medicinal plants like Quercus tinctoria, Curcuma longa, Taxus brevifolia, Allium sativum, Asparagus racemosa, Camptotheca acuminate, Symplocus racemosa, Ginkgo biloba, Genistein, Zingiber officinale, Azadirachta indica, Embilica officinalis, Podophyllum peltatum, Camellia sinensis, Saraca indica. A large number of phytochemicals which has anticancer compounds are flavonoids, alkaloids, terpenoids, carotenoids, phenolics, and organosulfur compounds. Ayurvedic drugs highly effective on Ovarian Cancer are Arka, Bhallataka, Ahipena, Bhanga, Vishamushti, and Jayapala. The diagnosis of Ovarian Cancer in the initial stage is not possible mainly due to a lack of awareness on patients’ behalf. The main effective parameter is imaging for checking the extent and location of the disease. Some other parameters also included physical examination and transvaginal ultrasonography. Thus, the present review is an attempt to compile published reports through authentic sources regarding the current management scenario of Ovarian Cancer with the help of natural drugs or medicinal plants that inhibits or hinders the growth of cancer cell, which may serve as a ready reference for future researchers.

Habitat alteration assessment for the management of environmental flows in regulated basins.

The management of environmental flows is of paramount importance in regulated water resources systems to preserve river ecosystems. This work proposes a methodology to assess habitat alteration in river basins altered by management activities. The methodology is based on the joint application of a basin management model (SIMGES, AQUATOOL) and a model to estimate habitat time series (CAUDECO). CAUDECO is based on the weighted useable areas of the species in their different vital stages that, in turn, depend on the flows in each river stretch and the biological periods of the species. The final output is an indicator of habitat alteration, which is defined ad hoc for this work to relate the habitat suitability under regulated and natural regimes. The methodology was applied to a case study in north-western Spain: the Órbigo River basin. The results in the current management scenario highlight that the ecological flows improve the habitat suitability of several species with respect to natural regime conditions. For instance, the mean values of the habitat time series in the Órbigo River for the brown trout and bermejuela under regulated conditions are 69.6% and 88%; whereas in natural regime they are equal to 55.1% and 72.9%, respectively. Based on these results, eight additional scenarios of ecological flows were tested and their effects on both habitat alteration and water demand reliability were quantified and discussed. It was found that increases in the ecological flows up to 30% do not affect the reliability of water demands and reduce habitat alteration (i.e., lead to values of the habitat alteration indicator closer to 1) for all species present in the river basin. These results highlight that the methodology and indicator of habitat alteration proposed in this paper are useful to support the management of regulated river basins, since they allow assessing the implications of ecological flows on both habitat suitability and reliability of water demands.

Tradeoffs between units providing soil ecosystem services in multifunctional landscapes of the Orinoquia

Ecological assessment of soil ecosystem services was made through indicators of provision of nutrients, amount of organic matter, and cation exchange capacity; and climate regulation, carbon storage, in the Orotoy river basin. As units that provide ecosystem services, mosaics of tropical humid forest cover, oil palm crops and cattle pastures were selected, persistent for 20 years, in windows located in the upper, middle and lower areas of the basin. Soil samples (896) were collected and analyzed in the laboratory for determining physical and chemical properties. The data were processed with the SPAW and R software. Indicators, ranging from 0 to 1, and tradeoffs were represented on a 1: 25.000 scale land cover map. It was found that in the indicator of carbon storage, the low zone obtained the highest average value (0.42); and the indicator of the ecosystem service of nutrient provision obtained close average values in the middle and lower zones, 0.33 and 0.44, correspondingly. In vegetation cover, the tropical humid forest presented the highest average values for the indicator of climate regulation (0,43). The established trade-offs from the valuation are: the upper zone is fundamental for water regulation and climate regulation throughout the basin; forest cover in the entire basin regulates the climate, oil palm crops and cattle pastures via fertilization, contribute to the surrounding forests, located in areas of less slope. In the mosaics of the multifunctional landscapes it was found that although the ecosystem services are related to the forming factors of the soil and the vegetation coverage, the influence of cultural practices on the soils is also evident; these determine trade-offs. The importance of including the ecosystem services of the soil in the processes of territorial ordering and management of landscapes like the one of the basin of the Orotoy river is verified, which in the current management scenario presents trade-offs between zones and coverages.

Intensive agriculture, nitrogen legacies, and water quality: intersections and implications

More than a century of land-use changes and intensive agriculture across the Mississippi River Basin (MRB) has led to a degradation of soil and water resources. Nitrogen (N) leaching from the excess application of fertilizers has been implicated in algal blooms and the development of large, coastal ‘dead zones’. It is, however, increasingly recognized that water quality today is a function not only of the current-year inputs but also of legacy N within the watershed—legacy that has accumulated in soil and groundwater over decades of high-input agricultural practices. Although attempts have been made to quantify the extent to which soil organic nitrogen (SON) is being sequestered in agricultural soils with intensive fertilization, improved residue management, and the adoption of conservation tillage practices, the controls on accumulation dynamics as well as linkages between legacy N accumulation and water quality remain unclear. Here, we have used the process-based model CENTURY to quantify accumulation and depletion trajectories for soil N across a range of climate and soil types characteristic of the MRB. The model was calibrated against crop yield data and soil N accumulation data from a long-term field site. Model runs highlighted that under current management scenarios, N accumulation is greatest in regions with the highest crop yield, and this can be attributed to the higher residue rates with greater yields. We thus find that humans, through management practices, have homogenized spatial patterns of SON across the landscape by increasing SON magnitudes in warmer and drier regions. Results also suggest a regime shift in the relationship between soil organic N and N mineralization fluxes, such that N fluxes are greater now than in the 1930s, despite similar soil organic N magnitudes, mainly due to higher proportions of labile, unprotected soil organic matter. This regime shift leads to elevated N leaching to tiles and groundwater in landscapes under intensive agriculture.

Может ли экономика замкнутого цикла спасти мировую экономику?

Global polarization and linear economy models has for generations been the servant of ruthless capitalism and bourgeoisie ventures. In such ruthless circumstance there has been alarming situation both globally and locally to challenge prevailing linear economy structures to question and create a sustainable platform for protecting the resources and user structures of our future generations. Life cycle assessments globally has been a case study which has shown the minimal usage of products in value based propositions and bringing the environmental ecosystem in a balanced structure irrespective of political or governmental interventions. From the birth of the Paris Agreements on Climate changes, scientists and technologists globally has stressed upon the importance of sustainability and resilience on global food security as well as natural resource management. In such scenario resource allocations even in advanced countries like Europe and America has fallen prey to gross inequality, gender gaps and faulty resource transitions even in most advanced regions. Shocking Gini coefficient figures across boundaries have led scientists and economists globally to rethink and restrategise the way strategic business management hovers globally and to better revisualise globalization and utilize the resources our earth has endowed us upon. This paper challenges prevailing notions and even best practices in current management scenario and principles of economics of entrepreneurship to jump start a society based on values, tradition and value based usage proposition; in other terms from a linear based economy to a sustainable resilient circular economy model with greater emphasis on environmental protection, poverty eradication with better integration of triple line bottom of pyramid and better community disciplines to foster a vibrant shared economy model. There is a persistent gap lying across various parameters of a linear economy which has in turn been the causal effect of human impoverishment, poverty and vast scale ecological destructions. A case based approach and exploratory study in this research paper tries to answer rising question in addressing this burning topic of circular entrepreneurship which is quite different in structure and outcome to normative economical falsifications arising out of entrepreneurship models which has till now failed to create a functional economy devoid of hazards and wastes.

Evaluating spatial management options for tiger shark (Galeocerdo cuvier) conservation in US Atlantic Waters

Abstract There has been debate in the literature over the use and success of spatial management zones (i.e. marine protected areas and time/area closures) as policy tools for commercially exploited sharks. The tiger shark (Galeocerdo cuvier) is a highly migratory predator found worldwide in warm temperate and tropical seas, which is caught in multiple US fisheries. We used a spatially explicit modelling approach to investigate the impact of varying spatial management options in the Western North Atlantic Ocean on tiger shark biomass, catch, and distribution, and impacts to other species in the ecosystem. Results suggest that under current management scenarios, tiger shark biomass will increase over time. Model outputs indicate that protecting additional habitats will have relatively minimal impacts on tiger shark biomass, as would increasing or decreasing protections in areas not highly suitable for tiger sharks. However, increasing spatial management protections in highly suitable habitats is predicted to have a positive effect on their biomass. Results also predict possible spill-over effects from current spatial protections. Our results provide insights for evaluating differing management strategies on tiger shark abundance patterns and suggest that management zones may be an effective conservation tool for highly migratory species if highly suitable habitat is protected.

Current and potential contributions of the Gulf of Lion Fisheries Restricted Area to fisheries sustainability in the NW Mediterranean Sea

Among FAO’s Major Fishing Areas, the Mediterranean and the Black Sea had the highest percentage (62.5%) of stocks fished at unsustainable levels, especially demersal stocks. Spatial-temporal restrictions of fishing activities are important measures used for the management of marine stocks. However, sometimes these regulations are not fully implemented due to a lack of effectiveness and compliance, which contributes to their failure. Here, we developed a food-web model approach using the Ecopath with Ecosim (EwE) model representing the Fisheries Restricted Area (FRA) of the Gulf of Lion ecosystem (CoSEGoL model) prior to the establishment of the fisheries restrictions (2006–2008). We characterized the structure and functioning of the ecosystem before and after its establishment. The constructed food-web model was then fitted to the available time series of data from 2008 to 2016 to verify whether this FRA has contributed to the recovery of target demersal species and the demersal community. The fitted model was used to explore alternative future management scenarios to explore feasible management options in order to ensure a full ecosystem recovery under climate change conditions. Our results suggest a failure in the recovery of target species in the restricted area under the current management scenario, potentially revealing a lack of protection efficiency and/or enforcement. Scenarios of management options under plausible climate futures revealed possible recovery of targeted species, especially European hake. The study highlighted the importance of considering trophic interactions between predators and prey to identify trade-offs and synergies in fisheries management outcomes and the need to consider both fishing and climate dynamics.

A state-level restrictive policy as a potential trigger to discuss collaborative actions towards more sustainable shrimp fisheries on the southern coast of Brazil

Worldwide environmental impacts derived from bottom trawling, such as bycatch and habitat loss, have been widely discussed by fishers, scientists, and other stakeholders. A strategy to mitigate such impacts was adopted in the Rio Grande do Sul state (RS) in southern Brazil and involved an increase in the trawl exclusion zone (TEZ). Even though this intervention was implemented collaboratively by RS stakeholders, it was widely criticized by the fishing sector (mainly by shrimp fishers from other states), because of the associated loss of access to fishing areas within the extended exclusion zone. The TEZ law has increased conflicts between fishers from neighboring states and prompted meetings and discussions between fishers and policymakers at state and federal levels. Considering that Brazilian bottom-trawl fisheries are data-limited and that the current management scenario is focused on target species (e.g., shrimp fisheries), we believe that facilitating collaborative efforts between all stakeholders towards co-management of fisheries is necessary and possible. This approach could avoid negative social and economic impacts, and we propose four key directives to broaden the debate: 1. Establishment of local working groups; 2. Data acquisition and analysis within a bycatch co-monitoring program; 3. Designation and/or implementation of closed fishing seasons; and 4. Implementation and assessment of technologies to reduce bycatch. These directives might contribute to improving the legal framework and ecological status of shrimp fisheries (and their associated bycatch) along the southern Brazilian coast. By assuming a multi-stakeholder technical contribution system that embraces a regional co-management action, we could provide a model for areas and/or countries that lack fishery-related information and enhance the potential for sustainable and economically appropriate decision making.

Analysis and trends of rainfall amounts and extreme events in the Western Mediterranean region

Since the dawn of civilization, the Western Mediterranean region has been a unique path for encounters and exchanges. The stability of the general conditions prevailing in its surrounding was crucial to ensure this vital link between north and south and east and west. However, any imbalance would be the precursor of a harmful domino effect to these environments, where the natural vulnerabilities are combined to a worsening socioeconomic congestion. In both banks, efforts are made not to give way to the fragile balance of water availability and risks. Here, we show that the amount and recurrence of extreme rainfall events contradict with current management scenarios. Our pixel-based assessment of the rain components extracted from the African Rainfall Climatology product reveals an annual increase in the total amount of rainfall and extreme rainfall events. A spatial and a trend analysis of the studied rainfall components were carried out to determine their spatial patterns and magnitude. The cumulative annual rainfall alone will not mean if a year is dry or wet. A wet year can experience great periods of drought, which will have serious repercussions on the socioeconomic and ecological levels. In addition, the increased occurrence of extreme rains can produce floods, intensifying land degradation processes, loss of biodiversity, water availability and economic growth. Decision-makers should be aware that current models of territorial management will not be able to cope with this change and that interdisciplinary cohesion and cross-border actions are the most appropriate solution.

African wild dogs: Genetic viability of translocated populations across South Africa

South Africa holds a viable population of the endangered African wild dog (Lycaon pictus), with almost 500 individuals divided into (1) an unmanaged population in the Kruger National Park (KNP), (2) a free-roaming population, and (3) a managed metapopulation (MTP) that originated from reintroductions. Because metapopulation reserves are geographically isolated, translocations are ongoing to mimic natural dispersal. During this study, we questioned whether the metapopulation management plan for wild dogs has been successful at maintaining healthy levels of genetic diversity and avoiding inbreeding in packs. We evaluated whether the current approach is effective for long-term population viability and assessed whether population admixture occurs between the three populations. To achieve this, we amplified 20 microsatellite loci for genetic analysis. We found high levels of genetic variation, likely resulting from translocations and artificial pack formation. Results showed that in the absence of any management intervention, the MTP would lose 48% of its heterozygosity over a 100-year trajectory, and KNP 12% heterozygosity. Under the current management scenario, the MTP will maintain 95% of its heterozygosity. We found genetic evidence that limited recent dispersal occurs between the MTP and KNP (FST = 0.06). In conclusion, the metapopulation management plan can be considered successful based on the achieved population growth and preservation of genetic diversity. Our study highlights that genetic data form a critical part of conservation management, and that translocations can be a vital tool to restore genetic variability of species.

Optimización de la producción forestal maderable y conservación del ecosistema en bosques comunitarios en el sur de México

Current forest management approaches require management strategies that identify where and when to carry out harvest activities that satisfy the demand for wood products while forest ecosystem services are conserved. This work makes the TRIAD zoning approach operational through a mathematical model to optimize the forestry planning process. This approach proposes dividing the forest under management into an intensive harvesting area, an extensive harvesting area, and a conservation area, according to the production objectives established. A mixed integer nonlinear optimization model was formulated to maximize the present value of gains derived from timber production, while satisficing operative and biodiversity conservation restrictions associated with the forest community of San Pedro El Alto, Oaxaca, Mexico. The model was solved through a genetic algorithm, in their simple version (GNS), and two variants of it (GN2 and GN3). The process allowed completing three objectives: 1) to propose and validate a model capable of generating comparable solutions to the current management scenario in the community, 2) to compare three different solution algorithms, and 3) to offer an efficient algorithm to solve similar optimization problems.

Clinical Presentation and Management of 10 Consecutive Cases of Primary Orbital Tumors of Neurological Origin Presenting to a Regional Institute of Ophthalmology

Introduction: Proptosis is a common presentation to our outpatient department. The eyes are as much a visual structure as they are an aesthetic part of the face. We designed a study to document the clinical presentation and management of ten consecutive cases of primary benign neural orbital tumors presenting to a regional institute of ophthalmology. Aim: The aim of the study is to document the clinical presentation and management of ten consecutive cases of primary benign neural orbital tumors presenting to a regional institute of Ophthalmology. Methodology: Ten consecutive cases of primary benign neural orbital tumors were enrolled. They were subjected to a thorough clinical examination and imaging. Thereafter they were managed by observation, surgery or radiotherapy as per the case. Results: There were five cases of schwannoma which responded well to surgery with good visual outcome. The two cases of optic nerve glioma one was subjected to observation due to slow growth and good vision. The second case was managed surgically due to proptosis and poor vision. Two cases of meningioma were subjected to surgery due to proptosis with poor vision. One case was observed and subjected to radiotherapy due to good vision and slow growth. Discussion: We report the clinical presentation and management of primary orbital tumors of neurological origin from our part of the world. The current management scenario from our perspective is in concordance with that reported by other workers from different parts of the globe. Conclusion: Primary benign neural tumors of the orbit can be managed by surgery or observation as per the case. Our unique perspective on these tumors is invaluable to the world oncology literature.

Bison Conservation in Northern Great Plains National Parks: No Need to Panic

Bison (Bison bison) are a keystone species in the North American Great Plains. They are also a species of conservation concern in part because they suffered a severe population bottleneck at the end of the 19th century and now exist in mostly small and isolated populations. Wind Cave National Park introduced 20 bison in 1913–16; Theodore Roosevelt National Park introduced 29 animals to a South Unit in 1956 and subsequently transferred 20 bison from that herd to the park's North Unit in 1962; and Badlands National Park introduced 53 animals in 1963–64 and another 20 in 1984. The four herds are confined within fences, and no known introduction of new bison into the gene pools has occurred. The four herds are routinely culled down to approximately 425, 350, 200, and 700 animals, respectively. I found no evidence of inbreeding depression as measured by annual population growth and reproductive rates. A population viability analysis also failed to find persuasive evidence of inbreeding depression. Under current management scenarios, gene diversity in 100 years should remain above levels currently known to cause inbreeding depression in bison. I found no compelling reason to introduce new bison into the herds or transfer bison between herds in the foreseeable future.

Using an agent-based model to examine forest management outcomes in a fire-prone landscape in Oregon, USA

Fire-prone landscapes present many challenges for both managers and policy makers in developing adaptive behaviors and institutions. We used a coupled human and natural systems framework and an agent-based landscape model to examine how alternative management scenarios affect fire and ecosystem services metrics in a fire-prone multiownership landscape in the eastern Cascades of Oregon. Our model incorporated existing models of vegetation succession and fire spread and information from original empirical studies of landowner decision making. Our findings indicate that alternative management strategies can have variable effects on landscape outcomes over 50 years for fire, socioeconomic, and ecosystem services metrics. For example, scenarios with federal restoration treatments had slightly less high-severity fire than a scenario without treatment; exposure of homes in the wildland-urban interface to fire was also slightly less with restoration treatments compared to no management. Treatments appeared to be more effective at reducing high-severity fire in years with more fire than in years with less fire. Under the current management scenario, timber production could be maintained for at least 50 years on federal lands. Under an accelerated restoration scenario, timber production fell because of a shortage of areas meeting current stand structure treatment targets. Trade-offs between restoration outcomes (e.g., open forests with large fire-resistant trees) and habitat for species that require dense older forests were evident. For example, the proportional area of nesting habitat for northern spotted owl (Strix occidentalis) was somewhat less after 50 years under the restoration scenarios than under no management. However, the amount of resilient older forest structure and habitat for white-headed woodpecker (Leuconotopicus albolarvatus) was higher after 50 years under active management. More carbon was stored on this landscape without management than with management, despite the occurrence of high-severity wildfire. Our results and further applications of the model could be used in collaborative settings to facilitate discussion and development of policies and practices for fire-prone landscapes.

Management of Primary Adrenal Insufficiency: Review of Current Clinical Practice in a Developed and a Developing Country.

Treatment of primary adrenal insufficiency (PAI) requires lifelong hormone replacement with glucocorticoids (GCs) and mineralocorticoids. Impaired quality of life and increased standardized mortality ratio in these patients emphasize the importance of tailoring therapy to individual needs. Role of education is paramount in improving patient compliance and in anticipating and preventing adrenal crises. Although discovery of synthetic GCs was a major breakthrough in treatment of patients with this life-threatening condition, management of PAI continues to be challenging. The obstacles for clinicians appear to vary widely across the globe. While optimization and individualization of therapy after diagnosis of PAI remain the main challenges for clinicians in the developed world, doctors in a developing country face problems at almost every stage from the diagnosis to the treatment and follow-up of these patients; cost of therapy, lack of resources, and funding are the main hindrances. Adherence to therapy and patient education are found to be common issues in most parts of the world. This commentary highlights the challenges from both developed and developing country's perspective in treating PAI; it also provides an update on current management scenario and future treatment options.

A theoretical approach for zone-based management of the deer population on Yakushima Island

The biological balance of Yakushima Island is currently being compromised by overpopulation of sika deer (Cervus nippon yakushimae). We predicted that the island’s deer population would continue to grow unless control efforts are raised threefold from their 2012 levels. To identify the best management practice for future implementation, we evaluated and compared the performances of three different zone-based management strategies. Under the current management scenario, the median population size of the sika deer on the island would temporarily decrease, but it would subsequently rebound. Under a scenario that allows management zones to be prioritized according to the occurrence of threatened plant species and deer population size, model simulations suggested that the scenario focusing on the central zone would show the best performance based on the probability of achievement of the management goal (assuming that there is no dispersal between zones). This course of action would lead to a decrease in the median deer population size and would further ensure a high probability of achieving the 2022 target population size across most zones (up to 85 %), even if catch levels were not increased. In a future study, we would need to conduct a more detailed analysis of plants and deer density distributions.

Simulating restoration strategies for a southern boreal forest landscape with complex land ownership patterns

Restoring altered forest landscapes toward their ranges of natural variability (RNV) may enhance ecosystem sustainability and resiliency, but such efforts can be hampered by complex land ownership and management patterns. We evaluated restoration potential for southern-boreal forests in the ∼2.1millionha Border Lakes Region of northern Minnesota (U.S.A.) and Ontario (Canada), where spatially distinct timber harvest and fire suppression histories have differentially altered forest conditions (composition, age–class distribution, and landscape structure) among major management areas, effectively resulting in forest landscape “bifurcation.” We used a forest landscape simulation model to evaluate potential for four hypothetical management and two natural disturbance scenarios to restore forest conditions and reduce bifurcation, including: (1) a current management scenario that simulated timber harvest and fire suppression practices among major landowners; (2) three restoration scenarios that simulated combinations of wildland fire use and cross-boundary timber harvest designed to emulate natural disturbance patterns; (3) a historical natural disturbance scenario that simulated pre-EuroAmerican settlement fire regimes and windthrow; and (4) a contemporary fire regime that simulated fire suppression, but no timber harvest. Forest composition and landscape structure for a 200-year model period were compared among scenarios, among major land management regions within scenarios, and to six RNV benchmarks. The current management scenario met only one RNV benchmark and did not move forest composition, age–class distribution, or landscape structures toward the RNV, and it increased forest landscape bifurcation between primarily timber-managed and wilderness areas. The historical natural disturbance scenario met five RNV benchmarks and the restoration scenarios as many as five, by generally restoring forest composition, age–class distributions, and landscape structures, and reducing bifurcation of forest conditions. The contemporary natural disturbance scenario met only one benchmark and generally created a forest landscape dominated by large patches of late-successional, fire-prone forests. Some forest types (e.g., white and red pine) declined in all scenarios, despite simulated restoration strategies. It may not be possible to achieve all objectives under a single management scenario, and complications, such as fire-risk, may limit strategies. However, our model suggests that timber harvest and fire regimes that emulate natural disturbance patterns can move forest landscapes toward the RNV.