Western Ecological Research Center

Publications

Below is a list of WERC's peer-reviewed publications. If you are searching for a specific publication and cannot find it in this list, please contact werc_web@usgs.gov

Filter Total Items: 3,300
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Year Published: 2021

Free-roaming horses disrupt greater sage-grouse lekking activity in the Great Basin

Greater Sage-Grouse (Centrocercus urophasianus; hereafter, sage-grouse) and free-roaming horses (Equus caballus) co-occur within large portions of sagebrush ecosystems within the Great Basin of western North America. In recent decades, sage-grouse populations have declined substantially while concomitant free-roaming horse populations have...

Munoz, Diana A.; Coates, Peter S.; Ricca, Mark A.

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Year Published: 2021

Harnessing landscape genomics to identify future climate resilient genotypes in a desert annual

Local adaptation features critically in shaping species responses to changing environments, complicating efforts to revegetate degraded areas. Rapid climate change poses an additional challenge that could reduce fitness of even locally sourced seeds in restoration. Predictive restoration strategies that apply seeds with favourable adaptations to...

Shryock, Daniel F.; Washburn, Loraine K; DeFalco, Lesley A.; Esque, Todd C.

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Year Published: 2021

Multidecadal comparison of Red-footed Booby Sula sula diet at Ulupa'u Crater, O'ahu, Hawai'i

We describe the diet of Red-footed Boobies Sula sula nesting at Ulupaʻu Crater, Oʻahu, Hawaiʻi based on 106 regurgitations collected during 2014 and 2015. We also compare our results to a diet study at this colony five decades earlier. Both studies indicate that flying squid (Ommastrephidae) and flyingfish (Exocoetidae) are important prey for this...

Donahue, Sarah E.; Adams, Josh; Hyrenbach, K David

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Year Published: 2021

Genetic analysis of the diet of red‐footed boobies (Sula sula) provisioning chicks at Ulupa'u Crater, O'ahu

The diet of red‐footed boobies (Sula sula) provisioning chicks was quantified using 106 regurgitations collected from 81 adults over two study years with contrasting oceanographic conditions: 2014 and 2015.A total of 1,049 prey items were sorted into three broad categories (fish, squid, and other, consisting of highly‐digested ‘mush’ and parasitic...

Donahue, Sarah E.; Adams, Josh; Renshaw, Mark A; Hyrenbach, K David

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Year Published: 2021

Genetic diversity, population structure, and historical demography of a highly vagile and human‐impacted seabird in the Pacific Ocean: The red‐tailed tropicbird, Phaethon rubricauda

Many seabird breeding colonies have recovered from heavy anthropogenic disturbance after conservation actions. The widely distributed red‐tailed tropicbird, Phaethon rubricauda, was used as a model species to assess potential anthropogenic impacts on the genetic diversity of breeding colonies in the Pacific Ocean.Cytochrome c ...

Varela, Andrea I; Brokordt, Katherina; Ismar‐Rebitz, Stefanie M.H.; Gaskin, Chris P; Carlile, Nicholas; O'Dwyer, Terence; Adams, Josh; Vanderwerf, Eric A.; Luna‐Jorquera, Guillermo

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Year Published: 2021

Integrating the evidence for a terrestrial carbon sink caused by increasing atmospheric CO2

Atmospheric carbon dioxide concentration ([CO2]) is increasing, which increases leaf‐scale photosynthesis and intrinsic water‐use efficiency. These direct responses have the potential to increase plant growth, vegetation biomass, and soil organic matter; transferring carbon from the atmosphere into terrestrial ecosystems (a carbon sink). A...

Walker, Anthony P.; De Kauwe, Martin G; Bastos, Ana; Belmecheri, Soumaya; Georgiou, Katerina; Keeling, Ralph F.; McMahon, Sean M.; Medlyn, Belinda E.; Moore, David J P; Norby, Richard J.; Zaehle, Sönke; Anderson-Teixeira, Kristina J.; Battipaglia, Giovanna; Brienen, Roel J W; Cabugao, Kristine G; Cailleret, Maxime; Campbell, Elliott; Canadell, Josep G; Ciais, Philippe; Craig, Matthew E; Ellsworth, David S; Farquhar, Graham D; Fatichi, Simone; Fisher, Joshua B.; Frank, David C; Graven, Heather; Gu, Lianhong; Haverd, Vanessa; Heilman, Kelly A; Heimann, Martin; Hungate, Bruce A; Iverson, Colleen M.; Joos, Fortunat; Jiang, Mingkai; Keenan, Trevor F.; Knauer, Jurgen; Korner, Christian; Leshyk, Victor O; Leuzinger, Sebastian; Liu, Yao; MacBean, Natasha; Malhi, Yadvinder; McVicar, Tim R; Penuelas, Josep; Pongratz, Julia; Powell, A Shafer; Riutta, Terhi; Sabot, Manon E B; Schleucher, Juergen; Sitch, Stephen; Smith, William K.; Sulman, Benjamin N.; Taylor, Benton; Terrer, Cesar; Torn, Margaret S.; Treseder, Kathleen K; Trugman, Anna T; Trumbore, Susan E.; van Mantgem, Phillip J.; Voelker, Steve L; Whelan, Mary E; Zuidema., Peiter A

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Year Published: 2021

Mortality predispositions of conifers across western USA

Conifer mortality rates are increasing in western North America, but the physiological mechanisms underlying this trend are not well understood.We examined tree‐ring‐based radial growth along with stable carbon (C) and oxygen (O) isotope composition (δ13C and δ18O, respectively) of dying and surviving conifers at eight old‐growth forest sites...

Wang, Wenzhi; English, Nathan B.; Grossiord, Charlotte; Gessler, Arthur; Das, Adrian; Stephenson, Nathan L.; Baisan, Christopher H.; Allen, Craig D.; McDowell, Nate G.

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Year Published: 2021

At Palmyra Atoll, the fish‐community environmental DNA signal changes across habitats but not with tides

At Palmyra Atoll, the environmental DNA (eDNA) signal on tidal sand flats was associated with fish biomass density and captured 98%–100% of the expected species diversity there. Although eDNA spilled over across habitats, species associated with reef habitat contributed more eDNA to reef sites than to sand‐flat sites, and species associated with...

Lafferty, Kevin D.; Garcia-Vedrenne, Ana E; McLaughlin, John P.; Childress, Jasmine N.; Morse, Marisa F; Jerde, Christopher L.

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Year Published: 2020

Management of the brown-headed cowbird: Implications for endangered species and agricultural damage mitigation

The brown-headed cowbird (Molothrus ater; cowbird) is unique among North American blackbirds (Icteridae) because it is managed to mitigate the negative effects on endangered songbirds and economic losses in agricultural crops. Cowbird brood parasitism can further affect species that are considered threatened or endangered due to anthropogenic land...

Peer, Brian D; Kus, Barbara E.; Whitfield, Mary J.; Hall, Linnea S.; Rothstein, Stephen I

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Year Published: 2020

Hatchling emergence ecology of Ouachita map turtles (Graptemys ouachitensis) on the lower Wisconsin River, Wisconsin, USA

Despite its biological importance in shaping both individual fitness and population structure, much remains to be learned about the hatchling emergence ecology of most freshwater turtles. Here, we provide some of the first details on these early life stages for the Ouachita map turtle (Graptemys ouachitensis) obtained during 2015–2017 along the...

Geller, Gregory A; Casper, Gary S; Halstead, Brian J.

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Year Published: 2020

Occurrence of a suite of stream-obligate amphibians in timberlands of Mendocino County, California, examined using environmental DNA

Stream-obligate amphibians are important indicators of ecosystem health in the Pacific Northwest, but distributional information to improve forest management is lacking in many regions. We analyzed archived DNA extracted from water samples in 60 pools in streams on private timberlands in Mendocino County, California, for 3 California Species of...

Halstead, Brian J.; Goldberg, Caren S.; Douglas, Robert B; Kleeman, Patrick M.; Ulrich, David W

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Year Published: 2020

Dispersal of hatchling Ouachita map turtles (Graptemys ouachitensis) from natural nests on the lower Wisconsin River, Wisconsin, USA

Despite its importance to individual fitness and population dynamics, the dispersal behaviors of most neonate freshwater turtles after nest emergence are poorly known. We studied the initial dispersal tendencies of neonate Ouachita map turtles (Graptemys ouachitensis) exiting natural nests during 2015–2017 along the Wisconsin River, Wisconsin....

Geller, Gregory A; Casper, Gary S; Halstead, Brian J.