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THE RISING RISK OF DROUGHT. Droughts of the twenty-first century are characterized by hotter temperatures, longer duration, and greater spatial extent, and are increasingly exacerbated by human demands for water. This situation increases the vulnerability of ecosystems to drought, including a rise in drought-driven tree mortality globally (Allen et al. 2015) and anticipated ecosystem transformations from one state to another—for example, forest to a shrubland (Jiang et al. 2013). When a drought drives changes within ecosystems, there can be a ripple effect through human communities that depend on those ecosystems for critical goods and services (Millar and Stephenson 2015). For example, the “Millennium Drought”...
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Types: Citation
Climate change is already affecting ecosystems, with the potential to trigger significant and permanent state changes in both natural and human systems. Ecological transformations may stem from gradual changes, or may occur rapidly; for an example, an extensive drought-related mortality event may be coupled with regeneration conditions that are no longer able to support the re-establishment of the historic ecosystem. In addition to climate change, patterns of land use and human water use, and site-scale management history may be important contributors to the degree or pace of change. This project focuses on climate-related risks in the Great Plains of the U.S., a grassland dominated region with a complex history...
Categories: Publication;
Types: Citation
Institutional authority and responsibility for allocating water to ecosystems (“ecologically available water” [EAW]) is spread across local, state, and federal agencies, which operate under a range of statutes, mandates, and planning processes. We use a case study of the Upper Missouri Headwaters Basin in southwestern Montana, United States, to illustrate this fragmented institutional landscape. Our goals are to (a) describe the patchwork of agencies and institutional actors whose intersecting authorities and actions influence the EAW in the study basin; (b) describe the range of governance mechanisms these agencies use, including laws, policies, administrative programs, and planning processes; and (c) assess the...
Categories: Publication;
Types: Citation
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