Global blue carbon accumulation in tidal wetlands increases with climate change

Coastal tidal wetlands produce and accumulate significant amounts of organic carbon (C) that help to mitigate climate change. However, previous data limitations have prevented a robust evaluation of the global rates and mechanisms driving C accumulation. Here, we go beyond recent soil C stock estimates to reveal global tidal wetland C accumulation and predict changes under relative sea level rise, temperature and precipitation. We use data from literature study sites and our new observations spanning wide latitudinal gradients and 20 countries. Globally, tidal wetlands accumulate 53.65 (95%CI: 48.52–59.01) Tg C yr⁻¹, which is ∼30% of the organic C buried on the ocean floor. Modeling based on current climatic drivers and under projected emissions scenarios revealed a net increase in the global C accumulation by 2100. This rapid increase is driven by sea level rise in tidal marshes, and higher temperature and precipitation in mangroves. Countries with large areas of coastal wetlands, like Indonesia and Mexico, are more susceptible to tidal wetland C losses under climate change, while regions such as Australia, Brazil, the USA and China will experience a significant C accumulation increase under all projected scenarios.     

The validity of the commercially-available,low-cost,wrist-worn Movband accelerometer during treadmill exercise and free-living physical activity

Low-cost physical activity monitors may provide a more accurate measure of physical activity than subjective methods (e.g., self-report) while being less costly than research-grade accelerometers. The present study assessed the validity of a low-cost monitor (Movband 2) to estimate physical activity behavior/intensity. Participants (N = 23, n = 16 female, BMI = 22.9 ± 4.0 kg/m², age = 21.9 ± 1.6 years) completed four, five-minute treadmill stages (2.0, 3.0, 4.0, 5.0 MPH) while wearing both the Movband and the previously-validated Actigraph monitor. Oxygen consumption (VO₂) was recorded during each stage (Laboratory assessment). A subset (n = 15, n = 10 female, BMI = 22.2 ± 3.2 kg/m², age = 21.5 ± 0.8 years) of these participants then wore the two accelerometers for three days (Free-living assessment). During the Laboratory assessment there were strong, significant (r = 0.94, p ≤ 0.001) relationships between Movband and Actigraph counts and VO₂. During Free-living assessment there was also a strong, significant (r = 0.97, p < 0.001) correlation between Movband and Actigraph counts. The low-cost, Movband accelerometer appears to provide a valid assessment of physical activity behavior/intensity.     

Computers and Traditional Teaching Practices: Factors influencing middle level students’ science achievement and attitudes about science

The purpose of this study was to examine the association of middle school student science achievement and attitudes toward science with student-reported frequency of using computers to learn science and other classroom practices. Baseline comparison data were collected on the frequency of student-centred teaching practices (e.g. the use of group experiments during science class) and traditional teaching practices (e.g. having students copy notes during science class) to learn science. The student sample was composed of 294 seventh-grade students enrolled in middle school science. Multiple regression was used to investigate the association of attitudes toward science, student-centred teaching practices, computer usage, and traditional teaching practices with science achievement. Both attitudes toward science and student-centred teaching practices were positively associated with science achievement, and student-centred teaching practice was positively associated with attitude toward science. Computer usage was found to have a negative association with student achievement, which was moderated by traditional teaching practices.     

Motivating Children to Learn Effectively: Exploring the Value of Intrinsic Integration in Educational Games

The concept of intrinsic motivation lies at the heart of the user engagement created by digital games. Yet despite this, educational software has traditionally attempted to harness games as extrinsic motivation by using them as a sugar coating for learning content. This article tests the concept of intrinsic integration as a way of creating a more productive relationship between educational games and their learning content. Two studies assessed this approach by designing and evaluating an educational game called Zombie Division to teach mathematics to 7- to 11-year-olds. Study 1 examined the learning gains of 58 children who played either the intrinsic, extrinsic, or control variants of Zombie Division for 2 hr, supported by their classroom teacher. Study 2 compared time on task for the intrinsic and extrinsic variants of the game when 16 children had free choice of which game to play. The results showed that children learned more from the intrinsic version of the game under fixed time limits and spent 7 times longer playing it in free-time situations. Together, these studies offer evidence for the genuine value of an intrinsic approach for creating effective educational games. The theoretical and commercial implications of these findings are discussed.     

A CURRICULUM FOR THE PRIMARY GRADES

Israeli film and television have risen to international prominence, presenting compelling and complicating perspectives. Simultaneously, Web 2.0 technologies have accelerated the spread and immediacy of digital media. Following the work of Holtz (2003) and Levisohn (2010 Levisohn, J. A. 2010. A menu of orientations to the teaching of rabbinic literature. Journal of Jewish Education, 76(1): 4–51. doi:10.1080/15244110903534510[Taylor &; Francis Online] , [Google Scholar]) in developing orientations for teaching Bible and Rabbinic Literature, this article develops a menu of media studies orientations for teaching Israel to Americans. It explores distinctive aspects of media studies, the relevance to Israel education of the work of Marland (1968a, 1968b), and applies the orientations through case studies of the Israeli television series Be-Tipul and Hatufim and their American adaptations, In Treatment and Homeland.     

Rate-distortion optimized frame dropping and scheduling for multi-user conversational and streaming video

INTRODUCTION Video packets are transmitted over the Internet using a best-effort service. Therefore, a large number of simultaneous video streams or cross traffic arriving at a network node (e.g. a multimedia gateway) may sometimes exceed the node’s forwarding capacity, i.e., the incoming data rate may exceed the outgoing data rate at the node. In this paper, we consider a scenario where M streaming videos and N conversa- tional videos pass through a network node with lim- ited forwardi…     

Does Student Effort Respond to Incentives? Evidence from a Guaranteed College Admissions Program

This paper studies the effects of guaranteed college admission on student effort and achievement. In 1997, Texas enacted the “Top Ten Percent” law, which guarantees admission to any public college for students in the top ten percent of their high school class. In practice, eligible students become aware of their admission status at the end of their junior year in high school—more than 1 year prior to attending college. We use data from a large, urban school district and regression discontinuity methods to test for effects on effort. Our preferred estimates show that students who barely qualify for the admissions guarantee earn marginally lower grades and take fewer advanced courses in their senior year compared to students who do not qualify for guaranteed admission and learn their status in the final senior year term. We find qualitatively similar results when limiting our sample to finer bandwidths, although the estimates are imprecise.