Exploring: Endangered Species
Whooping Cranes past and present
The Whooping Crane (Grus americana), endemic to North America, is the rarest of all crane species. It is believed that in the early 1800s, the Whooping Crane was widespread in North America, though it was never very abundant. Whooping Crane numbers decreased precipitously as westward migration of Euro-American settlers converted ...French, John B.; Converse, Sarah J.; Austin, Jane E.
Klamath River Basin water-quality data
The Klamath River Basin stretches from the mountains and inland basins of south-central Oregon and northern California to the Pacific Ocean, spanning multiple climatic regions and encompassing a variety of ecosystems. Water quantity and water quality are important topics in the basin, because water is a critical resource for farming and municipal...Sobieszczyk, Steven; Smith, Cassandra D.; Rounds, Stewart A.; Orzol, Leonard L.
Crowding affects health, growth, and behavior in headstart pens for Agassiz's desert tortoise
Worldwide, scientists have headstarted threatened and endangered reptiles to augment depleted populations. Not all efforts have been successful. For the threatened Agassiz's desert tortoise (Gopherus agassizii), one challenge to recovery is poor recruitment of juveniles into adult populations, and this is being addressed through headstart programs...Mack, Jeremy S.; Schneider, Heather E.; Berry, Kristin H.
Status and trends of adult Lost River (Deltistes luxatus) and shortnose (Chasmistes brevirostris) sucker populations in Upper Klamath Lake, Oregon, 2017
Executive SummaryData from a long-term capture-recapture program were used to assess the status and dynamics of populations of two long-lived, federally endangered catostomids in Upper Klamath Lake, Oregon. Lost River suckers (LRS; Deltistes luxatus) and shortnose suckers (SNS; Chasmistes brevirostris) have been captured and tagged with passive...Hewitt, David A.; Janney, Eric C.; Hayes, Brian S.; Harris, Alta C.
Flight response to spatial and temporal correlates informs risk from wind turbines to the California Condor
Wind power is a fast-growing energy resource, but wind turbines can kill volant wildlife, and the flight behavior of obligate soaring birds can place them at risk of collision with these structures. We analyzed altitudinal data from GPS telemetry of critically endangered California Condors (Gymnogyps californianus) to assess the circumstances...Poessel, Sharon; Brandt, Joseph; Mendenhall, Laura C.; Braham, Melissa A.; Lanzone, Michael J.; McGann, Andrew J.; Katzner, Todd E.
With over 1300 species identified, bats represent almost one quarter of the world’s mammals (Fenton and Simmons 2014), bats provide important environmental services such as insect pest suppression, seed dispersal, and pollination and inhabit a wide variety of ecological niches on all continents except Antarctica. Over 150 species are listed as...Farina, Lisa L.; Lankton, Julia S.
Water temperature in the Lower Quinault River, Olympic Peninsula, Washington, June 2016 - August 2017
The availability of cold-water refugia during summertime river-water temperature maximums is important for cold-water fish species including Endangered Species Act listed salmonids since water temperature influences metabolism, growth, and phenology. The U.S. Geological Survey monitored water temperature at 10 sites approximately evenly-spaced...Jaeger, Kristin L.; Curran, Christopher A.; Wulfkuhle, Elyse J.; Opatz, Chad C.
A semi-arid river in distress: Contributing factors and recovery solutions for three imperiled freshwater mussels (Family Unionidae) endemic to the Rio Grande basin in North America
Freshwater resources in arid and semi-arid regions are in extreme demand, which creates conflicts between needs of humans and aquatic ecosystems. The Rio Grande basin in the southwestern United States and northern Mexico exemplifies this issue, as much of its aquatic biodiversity is in peril as a result of human activities. Unionid mussels have...Randklev, Charles R.; Miller, Tom; Hart, Michael; Morton, Jennifer; Johnson, Nathan A.; Skow, Kevin; Inoue, Kentaro; Tsakiris, Eric; Oetker, Susan; Smith, Ryan; Robertson, Clint; Lopez, Roel
Two-species occupancy modeling accounting for species misidentification and nondetection
In occupancy studies, species misidentification can lead to false‐positive detections, which can cause severe estimator biases. Currently, all models that account for false‐positive errors only consider omnibus sources of false detections and are limited to single‐species occupancy.However, false detections for a given species often occur because...Chambert, Thierry; Campbell Grant, Evan H.; Miller, David A. W.; Nichols, James; Mulder, Kevin P.; Brand, Adrianne B,
Inferring species interactions through joint mark–recapture analysis
Introduced species are frequently implicated in declines of native species. In many cases, however, evidence linking introduced species to native declines is weak. Failure to make strong inferences regarding the role of introduced species can hamper attempts to predict population viability and delay effective management responses. For many species...Yackulic, Charles B.; Korman, Josh; Yard, Michael D.; Dzul, Maria C.
Population estimates of the Endangered Hawaiʻi ʻĀkepa (Loxops coccineus) in different habitats on windward Mauna Loa
Endangered Hawai‘i ʻĀkepas (Loxops coccineus) are endemic to Hawai‘i island, where they occur in five spatially distinct populations. Data concerning the status and population trends of these unique Hawaiian honeycreepers are crucial for assessing the effectiveness of recovery and management actions. In 2016, we used point‐transect distance...Judge, Seth W.; Camp, Richard J.; Hart, Patrick J.; Kichman, Scott T.
Rearing environment influences boldness and prey acquisition behavior, and brain and lens development of bull trout
Animals reared in barren captive environments exhibit different developmental trajectories and behaviors than wild counterparts. Hence, the captive phenotypes may influence the success of reintroduction and recovery programs for threatened and endangered species. We collected wild bull trout embryos from the Metolius River Basin, Oregon and reared...Brignon, William R.; Pike, Martin M.; Ebbesson, Lars O.E.; Schaller, Howard A.; Peterson, James T.; Schreck, Carl B.
Molecular and morphological data reveal non-monophyly and speciation in imperiled freshwater mussels (Anodontoides and Strophitus)
Accurate taxonomic placement is vital to conservation efforts considering many intrinsic biological characteristics of understudied species are inferred from closely related taxa. The rayed creekshell, Anodontoides radiatus (Conrad, 1834), exists in the Gulf of Mexico drainages from western Florida to Louisiana and has been petitioned for listing...Smith, Chase H.; Johnson, Nathan A.; Pfeiffer, John M.; Gangloff, Michael M.
Invasive rat control is an efficient, yet insufficient, method for recovery of the critically endangered Hawaiian plant hau kuahiwi (Hibiscadelphus giffardianus)
Biological invasions of rodents and other species have been especially problematic on tropical islands. Invasive Rattus rattus consumption of Hibiscadelphus giffardianus (Malvaceae; common Hawaiian name hau kuahiwi) fruit and seeds has been hypothesized to be the most-limiting factor inhibiting the critically endangered tree, but this has not been...Gill, Nathan S.; Yelenik, Stephanie G.; Banko, Paul C.; Dixon, Christopher B.; Jaenecke, Kelly; Peck, Robert
Population genomic surveys for six rare plant species in San Diego County, California
San Diego County is a hotspot of biodiversity, situated at the intersection of the Baja peninsula, the California floristic province, and the desert southwest. This hotspot is characterized by a high number of rare and endemic species, which persist alongside a major urban epicenter. San Diego County has implemented a strategic management plan...Milano, Elizabeth R.; Vandergast, Amy G.
Findings and lessons learned from the assessment of the Mexico-United States transboundary San Pedro and Santa Cruz aquifers: The utility of social science in applied hydrologic research
Study RegionThis study region encompasses the Transboundary San Pedro and Santa Cruz aquifers which are shared between the states of Sonora (Mexico) and Arizona (US). Special regional considerations include a semi-arid climate, basin-fill aquifers with predominantly montane recharge areas, economic drivers in the mining, trade, and military...Callegary, James B.; Megdal, Sharon B.; Tapia Villaseñor, Elia María; Petersen-Perlman, Jacob D.; Minjárez Sosa, Ismael; Monreal, R.; Gray, F.; Grijalva Noriega, Francisco
United States bat species of concern: A synthesis
In 1994 the federal government designated 24 species or subspecies of bats in the United States (U.S.) and its territories as Category 2 candidates for listing as Endangered or Threatened under the U.S. Endangered Species Act. Category 2 was eliminated in 1996, but taxa previously receiving this designation were informally considered “species of...O'Shea, Thomas J.; Cryan, Paul; Bogan, Michael A.
Genetic analyses of Astragalus sect. Humillimi (Fabaceae) resolve taxonomy and enable effective conservation
Premise of the StudyAstragalus sect. Humillimi is distributed across the southwestern United States and contains two endangered taxa, A. cremnophylax var. cremnophylax and A. humillimus. The former was originally described from the South Rim of the Grand Canyon. Analysis of individuals discovered on the...Massatti, Robert; Belus, Matthew; Dowlatshahi, Shahed; Allan, Gerard J.
U.S. Geological Survey sage-grouse and sagebrush ecosystem research annual report for 2018
The sagebrush (Artemisia spp.) ecosystem extends across a large portion of the Western United States, and the greater sage-grouse (Centrocercus urophasianus) is one of the iconic species of this ecosystem. Greater sage-grouse populations occur in 11 States and are dependent on relatively large expanses of sagebrush-dominated habitat. Sage-grouse...Hanser, Steven E.
Quantitative tools for implementing the new definition of significant portion of the range in the U.S. Endangered Species Act
In 2014, the Fish and Wildlife Service (FWS) and National Marine Fisheries Service announced a new policy interpretation for the U.S. Endangered Species Act (ESA). According to the act, a species must be listed as threatened or endangered if it is determined to be threatened or endangered in a significant portion of its range (SPR). The 2014...Earl, Julia E.; Nicol, Samuel; Wiederholt, Ruscena; Diffendorfer, Jay E.; Semmens, Darius J.; Flockhart, D. T. Tyler; Mattsson, Brady; McCracken, Gary; Norris, D. Ryan; Thogmartin, Wayne E.; Lopez-Hoffman, Laura