Genetic structure and dispersal in peripheral populations of a marine fish (Pacific cod, Gadus macrocephalus) and their importance for adaptation to climate change.

Small and isolated peripheral populations, which are often remnants of glacial refugia, offer an opportunity to determine the magnitude and direction of fine-scale connectivity in high gene flow marine species. When located at the equatorial edge of a species' range, these populations may also harbor genetic diversity related to survival and reproduction at higher temperatures, a critical resource for marine species facing warming ocean temperatures. Pacific cod (Gadus macrocephalus), a marine fish in the North Pacific, has already experienced major shifts in biomass and distribution linked to climate change. We estimated the magnitude and direction of connectivity between peripheral populations of Pacific cod at the southern edge of the species' range, by conducting restriction site-associated DNA (RAD) sequencing and individual assignment on fish collected around the Korean Peninsula during the spawning season. Three populations on the western, eastern, and southern Korean coasts were highly differentiated (FST  = 0.025-0.042) and relatively small (Ne  = 433-1,777). Ten putative dispersers and estimates of contemporary migration rates revealed asymmetrical, west-to-east movement around the Korean Peninsula, at a higher rate than predicted by indirect estimates of connectivity (FST ). Allele frequencies at 87 RAD loci were decisively correlated with strong marine temperature gradients between the warmer southern coast and the cooler waters of the eastern and western coasts. Despite relatively small sample sizes, our data suggest asymmetrical dispersal and gene flow, potentially involving adaptive alleles, between peripheral populations inhabiting markedly different thermal regimes. Our study emphasizes the conservation value of peripheral populations in high gene flow marine fish species.

Public Health Emergency Response Leadership Training: A Qualitative Assessment of Existing Educational Opportunities and Perceived Facilitators, Barriers, and Priorities in Professional Development.

OBJECTIVE: We aimed to understand the current training environment for developing public health emergency response leaders and highlight facilitators and barriers in accessing targeted training. DESIGN: We designed 4 focus groups to gather organizational perspectives on public health emergency response leadership development. Discussions were recorded, transcribed, coded, and analyzed to synthesize key themes. SETTING: Focus groups were convened at the 2019 Preparedness Summit (March 27-28) in St Louis, Missouri. PARTICIPANTS: Twenty-three public health professionals from 9 Public Health Emergency Preparedness (PHEP) Cooperative Agreement award recipient jurisdictions and 12 local health departments participated. MAIN OUTCOME MEASURES: We examined the current availability, relevance, specificity, and utility of educational content and delivery modalities. Facilitators and barriers were identified as opportunities to improve training access. RESULTS: Generic emergency management training is considered important and widely available but with limited application in public health practice. Existing leadership training opportunities in public health emergency response are limited and not widely known. While organizational support and accessible training facilitate participation, resource constraints (ie, funding, time, and staff) exist as key barriers. In addition, frequent staff turnover and attrition that result in loss of institutional knowledge likely hinder effective public health emergency responses. CONCLUSION: Effective public health emergency response depends on capable leaders not only well versed in specialized technical disciplines and practices but also familiar with-or preferably fluent in-emergency management principles and functions. This study demonstrated that well-aimed training strategies and organizational planning are essential in developing public health emergency response leaders. Specifically, leadership development may accrue considerable benefit from a standardized training curriculum. In addition, scalable training programs developed through public, private, and academic partnerships may lessen resource demands on individual organizations to facilitate training access. Finally, training practicums (eg, mentoring, shadowing) may provide opportunities to facilitate active learning and preserve institutional knowledge through leadership transitions.

Marine heatwave challenges solutions to human-wildlife conflict.

Despite the increasing frequency and magnitude of extreme climate events, little is known about how their impacts flow through social and ecological systems or whether management actions can dampen deleterious effects. We examined how the record 2014-2016 Northeast Pacific marine heatwave influenced trade-offs in managing conflict between conservation goals and human activities using a case study on large whale entanglements in the U.S. west coast's most lucrative fishery (the Dungeness crab fishery). We showed that this extreme climate event diminished the power of multiple management strategies to resolve trade-offs between entanglement risk and fishery revenue, transforming near win-win to clear win-lose outcomes (for whales and fishers, respectively). While some actions were more cost-effective than others, there was no silver-bullet strategy to reduce the severity of these trade-offs. Our study highlights how extreme climate events can exacerbate human-wildlife conflict, and emphasizes the need for innovative management and policy interventions that provide ecologically and socially sustainable solutions in an era of rapid environmental change.

Climate shock effects and mediation in fisheries.

Climate shocks can reorganize the social-ecological linkages in food-producing communities, leading to a sudden loss of key products in food systems. The extent and persistence of this reorganization are difficult to observe and summarize, but are critical aspects of predicting and rapidly assessing community vulnerability to extreme events. We apply network analysis to evaluate the impact of a climate shock-an unprecedented marine heatwave-on patterns of resource use in California fishing communities, which were severely affected through closures of the Dungeness crab fishery. The climate shock significantly modified flows of users between fishery resources during the closures. These modifications were predicted by pre-shock patterns of resource use and were associated with three strategies used by fishing community member vessels to respond to the closures: temporary exit from the food system, spillover of effort from the Dungeness crab fishery into other fisheries, and spatial shifts in where crab were landed. Regional differences in resource use patterns and vessel-level responses highlighted the Dungeness crab fishery as a seasonal "gilded trap" for northern California fishing communities. We also detected disparities in climate shock response based on vessel size, with larger vessels more likely to display spatial mobility. Our study demonstrates the importance of highly connected and decentralized networks of resource use in reducing the vulnerability of human communities to climate shocks.

The Use of a Patient Discharge Lounge and the Impact on 30-Day Hospital Readmission.

OBJECTIVE: To investigate if there is a relationship between the use of a patient discharge hospitality center (DHC) and hospital readmissions. BACKGROUND: Hospital discharge lounges or DHCs have been developed to improve patient throughput. No studies have been conducted to determine if a discharge location influences hospital readmission. METHODS: Data were extracted for adults discharged to home or self-care. Patients were stratified by discharge/last department and admitting/discharge service lines. Readmission rates between groups in the stratified data were compared. DHC and control patients were matched on gender, marital status, age at admission, type, discharging/last department before the DHC, discharging service line, and readmission risk category. RESULTS: There was no significant difference in the readmission rate of the control group (9.74%) compared with the DHC group (9.93%), χ1 (n = 3204) = 0.031, P = .86. CONCLUSIONS: The results of this analysis do not indicate that being discharged from a DHC has an impact on readmission rates.

Population assignment and local adaptation along an isolation-by-distance gradient in Pacific cod (Gadus macrocephalus).

The discernment of populations as management units is a fundamental prerequisite for sustainable exploitation of species. A lack of clear stock boundaries complicates not only the identification of spatial management units, but also the assessment of mixed fisheries by population assignment and mixed stock analysis. Many marine species, such as Pacific cod, are characterized by isolation by distance, showing significant differentiation but no clear stock boundaries. Here, we used restriction-site-associated DNA (RAD) sequencing to investigate population structure and assess power to genetically assign Pacific cod to putative populations of origin. Samples were collected across the species range in the eastern Pacific Ocean, from the Salish Sea to the Aleutian Islands. A total of 6,425 putative biallelic single nucleotide polymorphisms were identified from 276 individuals. We found a strong isolation-by-distance signal along coastlines that mirrored previous microsatellite results and pronounced genetic differentiation between coastal samples and those from the inland waters of the Salish Sea, with no evidence for hybridization between these two populations. Individual assignment success based on two methods was high overall (≥84%) but decreased from south to north. Assignment to geographic location of origin also was successful, with average distance between capture and assignment location of 220 km. Outlier analyses identified more loci potentially under selection along the coast than between Salish Sea and coastal samples, suggesting more diverse adaptation to latitudinal environmental factors than inshore vs. offshore environments. Our results confirm previous observations of sharp genetic differentiation of the Salish Sea population and isolation by distance along the coast, but also highlight the feasibility of using modern genomic techniques to inform stock boundaries and fisheries management in a low FST marine species.