Multi-trophic level response to extreme metal contamination from gold mining in a subarctic lake.

Giant Mine, located in the city of Yellowknife (Northwest Territories, Canada), is a dramatic example of subarctic legacy contamination from mining activities, with remediation costs projected to exceed $1 billion. Operational between 1948 and 2004, gold extraction at Giant Mine released large quantities of arsenic and metals from the roasting of arsenopyrite ore. We examined the long-term ecological effects of roaster emissions on Pocket Lake, a small lake at the edge of the Giant Mine lease boundary, using a spectrum of palaeoenvironmental approaches. A dated sedimentary profile tracked striking increases (approx. 1700%) in arsenic concentrations coeval with the initiation of Giant Mine operations. Large increases in mercury, antimony and lead also occurred. Synchronous changes in biological indicator assemblages from multiple aquatic trophic levels, in both benthic and pelagic habitats, indicate dramatic ecological responses to extreme metal(loid) contamination. At the peak of contamination, all Cladocera, a keystone group of primary consumers, as well as all planktonic diatoms, were functionally lost from the sediment record. No biological recovery has been inferred, despite the fact that the bulk of metal(loid) emissions occurred more than 50 years ago, and the cessation of all ore-roasting activities in Yellowknife in 1999.

Promoting Staff Resilience in the Pediatric Intensive Care Unit.

BACKGROUND: Health care professionals experience workplace stress, which may lead to impaired physical and mental health, job turnover, and burnout. Resilience allows people to handle stress positively. Little research is aimed at finding interventions to improve resilience in health care professionals. OBJECTIVE: To describe the availability, use, and helpfulness of resilience-promoting resources and identify an intervention to implement across multiple pediatric intensive care units. METHODS: A descriptive study collecting data on availability, utilization, and impact of resilience resources from leadership teams and individual staff members in pediatric intensive care units, along with resilience scores and teamwork climate scores. RESULTS: Leadership teams from 20 pediatric intensive care units completed the leadership survey. Individual surveys were completed by 1066 staff members (51% response rate). The 2 most used and impactful resources were 1-on-1 discussions with colleagues and informal social interactions with colleagues out of the hospital. Other resources (taking a break from stressful patients, being relieved of duty after your patient's death, palliative care support for staff, structured social activities out of hospital, and Schwartz Center rounds) were highly impactful but underused. Utilization and impact of resources differed significantly between professions, between those with higher versus lower resilience, and between individuals in units with low versus high teamwork climate. CONCLUSIONS: Institutions could facilitate access to peer discussions and social interactions to promote resilience. Highly impactful resources with low utilization could be targets for improved access. Differences in utilization and impact between groups suggest that varied interventions would be necessary to reach all individuals.