Optimal control of biological invasions in lake networks.

A metapopulation model for alien species invasion of a lake network is coupled with an economic model of prevention. The model restates a stochastic problem in deterministic terms. It provides a macroscopic description of the lake network with prevention methods controlling both the outflow of invaders at infected lakes and the inflow of invaders at uninfected lakes. Results indicate that optimal control implements no more than one of these methods at any moment in time. Typical optimal control measures change over time as the lake ecosystem becomes successively more invaded. Early control of outflow from infected lakes is replaced by later control of inflow to remaining uninfected lakes. Closed-loop control trajectories are analytically characterized in the phase-plane for a limiting case, while in general a simple and stable numerical algorithm is developed for solving the optimal control problem

Managing the climate commons at the nexus of ecology, behaviour and economics

Sustainably managing coupled ecological–economic systems requires not only an understanding of the environmental factors that affect them, but also knowledge of the interactions and feedback cycles that operate between resource dynamics and activities attributable to human intervention. The socioeconomic dynamics, in turn, call for an investigation of the behavioural drivers behind human action. We argue that a multidisciplinary approach is needed in order to tackle the increasingly pressing and intertwined environmental challenges faced by modern societies. Academic contributions to climate change policy have been constrained by methodological and terminological differences, so we discuss how programmes aimed at cross-disciplinary education and involvement in governance may help to unlock scholars' potential to propose new solutions

Development of an integrated economic and ecological framework for ecosystem-based fisheries management in New England

Author Posting. © The Author(s), 2012. This is the author's version of the work. It is posted here by permission of Elsevier B.V. for personal use, not for redistribution. The definitive version was published in Progress in Oceanography 102 (2012): 93-101, doi:10.1016/j.pocean.2012.03.007.We present an integrated economic-ecological framework designed to help assess the implementation of ecosystem-based fisheries management (EBFM) in New England. We develop the framework by linking a computable general equilibrium (CGE) model of a coastal economy to an end-to-end (E2E) model of a marine food web for Georges Bank. We focus on the New England region using coastal county economic data for a restricted set of industry sectors and marine ecological data for three top level trophic feeding guilds: planktivores, benthivores, and piscivores. We undertake numerical simulations to model the welfare effects of changes in alternative combinations of yields from feeding guilds and alternative manifestations of biological productivity. We estimate the economic and distributional effects of these alternative simulations across a range of consumer income levels. This framework could be used to extend existing methodologies for assessing the impacts on human communities of groundfish stock rebuilding strategies, such as those expected through the implementation of the sector management program in the US northeast fishery. We discuss other possible applications of and modifications and limitations to the framework.This work was supported by the NOAA Saltonstall-Kennedy Grant Program (Award No. NA09NMF4270097), the MIT Sea Grant College Program (NOAA Award No. NA10OAR4170086, Subaward No. 5710002974), and the Johnson Endowment of the WHOI Marine Policy Center

Injury and Illness: An Analysis of Team USA Athletes at the 2024 Winter Youth Olympic Games

BACKGROUND: Injury and illness surveillance is essential for understanding the relative risks of sports participation to develop effective strategies to optimize athlete health, wellness, and performance. Epidemiological studies examining injuries and illnesses among Team USA youth athletes are limited, particularly among athletes competing in Winter sports. The purpose of this study was to characterize the injury and illness incidence rate among Team USA athletes participating in the 2024 Winter Youth Olympic Games (YOG). METHODS: Injuries and illnesses among 101 Team USA youth athletes (40.6% female; age, 17 ± 1 years) were prospectively documented. Injury and illness prevalence, and incidence rate (IR) per 1,000 athlete-days (AD), and incidence rate ratios (IRR) were calculated with accompanying 95% confidence intervals ([95% CI]). RESULTS: Nineteen (18.8%) Team USA athletes reported at least one injury during the 2024 Winter YOG (38.0 [26.1, 53.3] injuries per 1,000 AD). Injury IR was highest among athletes competing in bobsled (166.7 [54.1, 388.9] injuries per 1,000 AD), and overuse was the most common mechanism of injury (17.3 [9.7, 28.5] injuries per 1,000 AD) among all athletes. There were no differences in injury IRs between male and female athletes (IRR [95%CI], 1.6 [0.7, 3.3]), but female athletes reported all time-loss injuries. Ten (9.9%) athletes reported at least one illness (15.0 [8.0, 26.5] per 1,000 AD), with respiratory illness (6%) being the most common type (6.9 [2.5, 15.0] per 1,000 AD). CONCLUSION: This study highlights the need for focused efforts for injury and illness prevention for youth female athletes and athletes participating in high-risk sliding sports. Additionally, consideration for implementation of respiratory illness mitigation measures and load management strategies at and leading up to future competitions for youth athletes is key

What Do Poor Women Want? Public Employment or Cash Transfers? Lessons from Argentina

The literature on public employment policies such as the job guarantee (JG) and the employer of last resort (ELR) often emphasizes their macroeconomic stabilization effects. But carefully designed and implemented policies like these can also have profound social transformative effects. In particular, they can help address enduring economic problems such as poverty and gender disparity. To examine how, this paper will look at the reform of Argentina’s Plan Jefes into Plan Familias. Plan Jefes was the hallmark stabilization policy of the Argentine government after the 2001 crisis. It guaranteed a public sector job in a community project to unemployed male and female heads of households. The vast majority of beneficiaries, however, turned out to be poor women. For a number of reasons that are explored below, the program was later reformed into a cash transfer policy, known as Plan Familias, that still exists today. The paper examines this reform in order to evaluate the relative impact of such policies on some of the most vulnerable members of society; namely, poor women. An examination of the Argentine experience based on survey evidence and fieldwork reveals that poor women overwhelmingly want paid work opportunities, and that a policy such as the JG or the ELR cannot only guarantees full employment and macroeconomic stabilization, but it can also serve as an institutional vehicle that begins to transform some of the structures and norms that produce and reproduce gender disparities. These transformative features of public employment policies are elucidated by turning to the capabilities approach developed by Amartya Sen and elaborated by Martha Nussbaum - an approach commonly invoked in the feminist literature. This paper examines how the access to paid employment can enhance what Sen defines as an individual’s 'substantive freedom'. Any policy that fosters genuine freedom begins with an understanding of what the targeted population (in this case, poor women) wants. It then devises a strategy that guarantees that such opportunities exist and removes the obstacles to accessing these opportunities

Proceedings from the Ice Hockey Summit III: Action on Concussion

Objectives The Ice Hockey Summit III provided updated scientific evidence on concussions in hockey to inform these five objectives: (1) describe sport related concussion (SRC) epidemiology, (2) classify prevention strategies, (3) define objective, diagnostic tests, (4) identify treatment and (5) integrate science and clinical care into prioritized action plans and policy. Methods Our action plan evolved from 40 scientific presentations. The 155 attendees (physicians, athletic trainers, physical therapists, nurses, neuropsychologists, scientists, engineers, coaches and officials) voted to prioritize these action items in the final Summit session. Results (1) establish a national and international hockey data base for SRCs at all levels; (2) eliminate body checking in Bantam youth hockey games; (3) expand a behavior modification program (Fair Play) to all youth hockey levels; (4) enforce game ejection penalties for fighting in Junior A and professional hockey leagues; (5) establish objective tests to diagnose concussion at point of care (POC); and (6) mandate baseline testing to improve concussion diagnosis for all age groups. Conclusions Expedient implementation of the Summit III prioritized action items is necessary to reduce the risk, severity and consequences of concussion in the sport of ice hockey