Wildfire smoke linked to vocal changes in wild Bornean orangutans.

Tropical peatlands are the sites of Earth's largest fire events, with outsized contributions to greenhouse gases, toxic smoke, and haze rich with particulate matter. The human health risks from wildfire smoke are well known, but its effects on wildlife inhabiting these ecosystems are poorly understood. In 2015, peatland fires on Borneo created a thick haze of smoke that blanketed the region. We studied its effects on the long call vocalizations of four adult male Bornean orangutans (Pongo pygmaeus wurmbii) in a peat swamp forest. During the period of heavy smoke, orangutans called less often and showed reduced vocal quality-lower pitch, increased harshness and perturbations, and more nonlinear phenomena-similar to changes in human smokers. Most of these changes persisted for two months after the smoke had cleared and likely signal changes in health. Our work contributes valuable information to support non-invasive acoustic monitoring of this Critically Endangered primate.

Effectiveness of 20 years of conservation investments in protecting orangutans.

Conservation strategies are rarely systematically evaluated, which reduces transparency, hinders the cost-effective deployment of resources, and hides what works best in different contexts. Using data on the iconic and critically endangered orangutan (Pongo spp.), we developed a novel spatiotemporal framework for evaluating conservation investments. We show that around USD 1 billion was invested between 2000 and 2019 into orangutan conservation by governments, nongovernmental organizations, companies, and communities. Broken down by allocation to different conservation strategies, we find that habitat protection, patrolling, and public outreach had the greatest return on investment for maintaining orangutan populations. Given the variability in threats, land-use opportunity costs, and baseline remunerations in different regions, there were differential benefits per dollar invested across conservation activities and regions. We show that although challenging from a data and analysis perspective, it is possible to fully understand the relationships between conservation investments and outcomes and the external factors that influence these outcomes. Such analyses can provide improved guidance toward a more effective biodiversity conservation. Insights into the spatiotemporal interplays between the costs and benefits driving effectiveness can inform decisions about the most suitable orangutan conservation strategies for halting population declines. Although our study focuses on the three extant orangutan species of Sumatra and Borneo, our findings have broad application for evidence-based conservation science and practice worldwide.

An evaluation of problem-based learning in a nursing theory and practice module.

Interest in Problem-Based Learning (PBL) within nurse education has increased internationally in recent years. The expectations of this teaching/learning strategy are that it will enable nurses to develop skills required for professional practice including: enquiry, reasoning, interpersonal and lifelong learning skills. However, to date, there is little empirical evidence within nursing literature to support such expectations. This study evaluated the reiterative PBL approach in an undergraduate programme within one University. The Responsive Evaluation Model (Guba & Lincoln 1989) guided the design of the study, permitting multiple methods of observation, focus group interview s and a questionnaire. Findings revealed an overall positive student experience of PBL. However, many students found PBL initially stressful due to the deliberately ambiguous nature of the scenario and the requirement upon students to direct their own le arning. The tutor role was unclear to some students, while others found the facilitative approach empowering. Recommendations are offered which may be of value to students, teachers and practitioners implementing and facilitating PBL within Making A Difference curricula (Department of Health 1999).