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Water users of the Platte River Basin have long struggled to share this scarce commodity in the arid high plains, ultimately organizing collectively owned and managed water systems, allocating water along extensive stream systems, and integrating newer groundwater with existing surface-water uses. In 1973, the Endangered Species Act brought a new challenge: incorporating the habitat needs of four species-the whooping crane, piping plover, least tern, and pallid sturgeon-into its water-management agenda. Implementing the Endangered Species Act on the Platte Basin Water Commons tells of the negotiations among the U.S. Department of the Interior, the environmental community, and the states of Wyoming, Colorado, and Nebraska that took place from the mid-1970s to 2006. Ambitious talks among rival water users, environmentalists, state authorities, and the Department of the Interior finally resulted in the Platte River Habitat Recovery Program. Documenting how organizational interests found remedies within the conditions set by the Endangered Species Act, describing how these interests addressed habitat restoration, and advancing sociological propositions under which water providers transcended self-interest and produced an agreement benefiting the environment, this book details the messy process that took place over more than thirty years. Presenting important implications for the future of water management in arid and semi-arid environments, this book will be of interest to anyone involved in water management, as well as academics interested in the social organization of common property.

Now forty years old, the Endangered Species Act (ESA) remains a landmark act in conservation and one of the world's most comprehensive laws designed to prevent species extinctions and support recovery efforts for imperiled species. A controversial law and often subject to political attack, the ESA is successful overall but not without difficulties. Those who enforce the ESA, for example, struggle to achieve viable recovery goals for many species.At the forefront of challenges is a reactive framework that sometimes leads to perverse incentives and legal battles that strain support and resources. Further, few species have been delisted.Proactive Strategies for Protecting Speciesexplores the perspectives, opportunities, and challenges around designing and implementing pre-listing programs and approaches to species conservation.This volume brings together conservation biologists, economists, private and government stakeholders, and others to create a legal, scientific, sociological, financial, and technological foundation for designing solutions that incentivize conservation action for hundreds of at-risk species-prior to their potential listing under the ESA.This forward-thinking, innovative volume provides a roadmap for designing species conservation programs on the ground so they are effective and take place upstream of regulation, which will contribute to a reduction in lawsuits and other expenses that arise after a species is listed.Proactive Strategies for Species Protectionis a guidebook for anyone anywhere interested in designing programs that incentivize environmental stewardship and species conservation.

Rapid environmental change makes adaptive potential—the capacity of populations to evolve genetically based changes in response to selection—more important than ever for long-term persistence of at-risk species. At the same time, advances in genomics provide unprecedented power to test for and quantify adaptive potential, enabling consideration of adaptive potential in estimates of extinction risk and laws protecting endangered species. The U.S. Endangered Species Act (ESA) is one of the most powerful environmental laws in the world, but so far, the full potential of genomics in ESA listing and recovery decisions has not been realized by the federal agencies responsible for implementing the ESA or by conservation geneticists. The goal of our paper is to chart a path forward for integrating genomics into ESA decision making to facilitate full consideration of adaptive potential in evaluating long-term risk of extinction. For policy makers, managers, and other conservation practitioners, we outline why adaptive potential is important for population persistence and what genomic tools are available for quantifying it. For conservation geneticists, we discuss how federal agencies can integrate information on the effect of adaptive potential on extinction risk—and the related uncertainty—into decisions, and suggest next steps for advancing understanding of the effect of adaptive potential on extinction risk. The mechanisms and consequences of adaptation are incredibly complex, and we may never have a complete understanding of adaptive potential for any organism. Nevertheless, we argue that the best available evidence regarding adaptive potential can now be incorporated by federal agencies into modeling and decision making processes, while at the same time conserving genome-wide variation and striving for a deeper understanding of adaptive potential and its effects on population persistence to improve decision making into the future.

Canada's Species at Risk Act (SARA) and the US Endangered Species Act (ESA) have adopted different approaches to achieve overlapping goals. We compare the ESA and SARA, focusing on the roles of science and policy in determining which species warrant legal protection. Our analysis suggests that each act could benefit from mimicking the strengths of the other, and both could be strengthened by greater clarity and transparency of listing determinations. A particular strength of SARA is that all evaluations of species' status are conducted by a single national scientific body. The ESA does not involve a comparable national body but has more stringent legal deadlines for listing actions, and listing decisions cannot by law consider socioeconomic factors (as can occur under SARA). The conservation of biodiversity would be enhanced if both acts were complemented by additional programs focused on broader efforts that protect more species before individual intervention is needed.

When introduced or cultivated plants or animals hybridize with their native relatives, the spread of invasive genes into native populations might have biological, aesthetic, and legal implications. Models suggest that the rate of displacement of native by invasive alleles can be rapid and inevitable if they are favored by natural selection. We document the spread of a few introduced genes 90 km into a threatened native species (the California Tiger Salamander) in 60 years. Meanwhile, a majority of genetic markers (65 of 68) show little evidence of spread beyond the region where introductions occurred. Using computer simulations, we found that such a pattern is unlikely to emerge by chance among selectively neutral markers. Therefore, our results imply that natural selection has favored both the movement and fixation of these exceptional invasive alleles. The legal status of introgressed populations (native populations that are slightly genetically modified) is unresolved by the US Endangered Species Act. Our results illustrate that genetic and ecological factors need to be carefully weighed when considering different criteria for protection, because different rules could result in dramatically different geographic areas and numbers of individuals being protected.

In recent decades, many bumble bee species have declined due to changes in habitat, climate, and pressures from pathogens, pesticides, and introduced species. The western bumble bee (Bombus occidentalis), once common throughout western North America, is a species of concern and will be considered for listing by the U.S. Fish and Wildlife Service (USFWS) under the Endangered Species Act (ESA). We attempt to improve alignment of data collection and research with USFWS needs to consider redundancy, resiliency, and representation in the upcoming species status assessment. We reviewed existing data and literature on B. occidentalis, highlighting information gaps and priority topics for research. Priorities include increased knowledge of trends, basic information on several life‐history stages, and improved understanding of the relative and interacting effects of stressors on population trends, especially the effects of pathogens, pesticides, climate change, and habitat loss. An understanding of how and where geographic range extent has changed for the two subspecies of B. occidentalis is also needed. We outline data that could be easily collected in other research projects that would increase their utility for understanding range‐wide trends of bumble bees. We modeled the overall trend in occupancy from 1998 to 2018 of Bombus occidentalis within the continental United States using existing data. The probability of local occupancy declined by 93% over 21 yr from 0.81 (95% CRI = 0.43, 0.98) in 1998 to 0.06 (95% CRI = 0.02, 0.16) in 2018. The decline in occupancy varied spatially by landcover and other environmental factors. Detection rates vary in both space and time, but peak detection across the continental United States occurs in mid‐July. We found considerable spatial gaps in recent sampling, with limited sampling in many regions, including most of Alaska, northwestern Canada, and the southwestern United States. We therefore propose a sampling design to address these gaps to best inform the ESA species status assessment through improved assessment of how the spatial distribution of stressors influences occupancy changes. Finally, we request involvement via data sharing, participation in occupancy sampling with repeated visits to distributed survey sites, and complementary research to address priorities outlined in this paper.

The US Endangered Species Act has enabled species conservation but has differentially impacted fire management and rare bird conservation in the southern and western US. In the South, prescribed fire and restoration-based forest thinning are commonly used to conserve the endangered red-cockaded woodpecker (Picoides borealis; RCW), whereas in the West, land managers continue to suppress fire across the diverse habitats of the northern, Californian, and Mexican spotted owls (Strix occidentalis subspecies; SO). Although the habitat needs of the RCW and SO are not identical, substantial portions of both species’ ranges have historically been exposed to relatively frequent, low-to moderate-intensity fires. Active management with fire and thinning has benefited the RCW but proves challenging in the western US. We suggest the western US could benefit from the adoption of a similar innovative approach through policy, public–private partnerships, and complementarity of endangered species management with multiple objectives. These changes would likely balance long-term goals of SO conservation and enhance forest resilience.

In 2017 the rusty patched bumble bee (Bombus affinis) became the first bee listed under the Endangered Species Act in the continental United States due to population declines and an 87% reduction in the species’ distribution. Bombus affinis decline began in the 1990s, predating modern bee surveying initiatives, and obfuscating drivers of decline. While understood to be a highly generalist forager, little is known about the role that resource limitation or shifting floral community composition could have played in B. affinis decline. Determining which floral species support B. affinis could assist conservation efforts where B. affinis persists and identify floral species for restoration efforts. We constructed a historical foraging profile of B. affinis via DNA sequencing of pollen from museum specimens spanning seven states collected from 1913 to 2013. Molecular analysis revealed no temporal changes in the floral richness or composition of B. affinis pollen samples across our sampling period. Likewise, we found no temporal changes in the presence or proportion of native vs. introduced species in pollen samples, though we observed much greater use of introduced floral species than previously determined for B. affinis. Floral community composition was regionally dissimilar, inconsistent with patterns of B. affinis decline by state. Our results suggest B. affinis decline was unlikely to have been driven by spatial or temporal limitations of specific floral species. This work greatly expands the known forage of B. affinis and will provide managers with insight to aid the conservation of B. affinis.