Marine plastic debris is a growing concern that has captured the general public’s attention. While the negative impacts of plastic debris on oceanic macrobiota, including mammals and birds, are well documented, little is known about its influence on smaller marine residents, including microbes that have key roles in ocean biogeochemistry. Our work provides a new perspective on microbial communities inhabiting microplastics that includes its effect on microbial biogeochemical activities and a description of the cross-domain communities inhabiting plastic particles. This study is among the first molecular ecology, plastic debris biota surveys in the North Pacific Subtropical Gyre. It has identified fundamental differences in the functional potential and taxonomic composition of plastic-associated microbes versus planktonic microbes found in the surrounding open-ocean habitat.

The varied effects of recent extreme weather events around the world exemplify the uneven impacts of climate change on populations, even within relatively small geographic regions. Differential human vulnerability to environmental hazards results from a range of social, economic, historical, and political factors, all of which operate at multiple scales. While adaptation to climate change has been the dominant focus of policy and research agendas, it is essential to ask as well why some communities and peoples are disproportionately exposed to and affected by climate threats. The cases and synthesis presented here are organized around four key themes (resource access, governance, culture, and knowledge), which we approach from four social science fields (cultural anthropology, archaeology, human geography, and sociology). Social scientific approaches to human vulnerability draw vital attention to the root causes of climate change threats and the reasons that people are forced to adapt to them. Because vulnerability is a multidimensional process rather than an unchanging state, a dynamic social approach to vulnerability is most likely to improve mitigation and adaptation planning efforts. This article is categorized under: Vulnerability and Adaptation to Climate Change > Values‐Based Approach to Vulnerability and Adaptation

No abstract

International cooperation has become a universal mandate for governing transboundary waterbodies. Diverse stakeholders promote cooperation as a desirable, if not indispensable, approach to achieving sustainable and equitable benefits from and for transboundary waterbodies. However, calls for international water cooperation operate from the presupposition that cooperation is an unambiguous concept. While cooperation appears self-evident and unproblematic, cases of formal cooperation reveal points of contestation about cooperation itself. For example, India and Bangladesh disagree about the extent to which cooperation is occurring over the Ganges River despite having penned a bilateral treaty that has been in force for 20 years. I analyze qualitative interviews and previously unpublished hydrological data to evaluate assertions that hydrological hazards in Southwestern Bangladesh result from India's activities and that India is failing to uphold the 1996 agreement. The analysis indicates that these assertions are true and false: India is broadly adhering to the Ganges Treaty but unilaterally withdraws water during a critical period of the dry season when regional livelihoods are most vulnerable. The study concludes that transboundary water cooperation as an abstract ideal overlooks the fact that cooperation as a practice emerges from and operates within specific historical, political, cultural, and economic contexts.