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: 3,064
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Year Published: 2018

Modeling resource selection of bobcats (Lynx rufus) and vertebrate species distributions in Orange County, southern California

For nature reserves in urban settings, wildlife and wildlife habitats may be affected by recreational activities and intensive, adjacent development. Sustaining biodiversity in such reserves is a challenge for land and natural resource managers, but identification of core areas and key resources for wildlife species may help in planning for...

Boydston, Erin E.; Tracey, Jeff A.
Boydston, E.E., and Tracey, J.A., 2018, Modeling resource selection of bobcats (Lynx rufus) and vertebrate species distributions in Orange County, southern California, with a section on Modeling for reptile, amphibian, and bird distributions by Tracey, J.A., Preston, K.L., Rochester, C.J., Boydston, E.E., and Fisher, R.N.: U.S. Geological Survey Open-File Report 2018–1095, 65 p., https://doi.org/10.3133/ofr20181095.

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Year Published: 2018

Spatial decision‐support tools to guide restoration and seed‐sourcing in the Desert Southwest

Altered disturbance regimes and shifting climates have increased the need for large‐scale restoration treatments across the western United States. Seed‐sourcing remains a considerable challenge for revegetation efforts, particularly on public lands where policy favors the use of native, locally sourced plant material to avoid maladaptation. An...

Shryock, Daniel F.; DeFalco, Lesley A.; Esque, Todd C.
Shryock, D. F., L. A. DeFalco, and T. C. Esque. 2018. Spatial decision‐support tools to guide restoration and seed‐sourcing in the Desert Southwest. Ecosphere 9(10):e02453. 10.1002/ecs2.2453

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Year Published: 2018

California Gull population growth and ecological impacts in the San Francisco Bay estuary, 1980–2016

The breeding population of California Gulls (Larus californicus) in the San Francisco Bay estuary increased from 24 individuals in 1980 to a peak of over 53,000 in 2014, then declined to 38,040 in 2016. The expansion of the breeding population may be related to the availability of suitable nesting sites in close proximity to anthropogenic food...

Burns, Catherine E.; Ackerman, Joshua T.; Washburn, Natalie B.; Bluso-Demers, Jill; Robinson-Nilsen, Caitlin; Strong, Cheryl

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Year Published: 2018

Detecting southern California’s white sharks with environmental DNA

To improve ability to detect white sharks without the need for tags, or visual census, we developed a species-specific environmental DNA (eDNA) assay that targets a 163 bp fragment of the white shark (Carcharodon carcharias) mitochondrial cytochrome B gene on a digital droplet PCR (ddPCR) platform. We used this marker to detect white shark DNA in...

Lafferty, Kevin D.; Benesh, Kasey C.; Mahon, Andrew R.; Jerde, Christopher L.; Lowe, Christopher G.
Lafferty KD, Benesh KC, Mahon AR, Jerde CL and Lowe CG (2018) Detecting Southern California’s White Sharks With Environmental DNA. Front. Mar. Sci. 5:355. doi: 10.3389/fmars.2018.00355

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Year Published: 2018

Quantifying climate sensitivity and climate-driven change in North American amphibian communities

Changing climate will impact species’ ranges only when environmental variability directly impacts the demography of local populations. However, measurement of demographic responses to climate change has largely been limited to single species and locations. Here we show that amphibian communities are responsive to climatic variability, using >...

Miller, David A.W.; Campbell Grant, Evan H.; Muths, Erin L.; Amburgey, Staci M.; Adams, M.J.; Joseph, Maxwell B.; Waddle, J. Hardin; Johnson, Pieter T.J.; Ryan, Maureen E.; Schmidt, Benedikt R.; Calhoun, Daniel L.; Davis, Courtney L.; Fisher, Robert N.; Green, David M.; Hossack, Blake R.; Rittenhouse, Tracy A.G.; Walls, Susan C.; Bailey, Larissa L.; Cruickshank, Sam S.; Fellers, Gary M.; Gorman, Thomas A.; Haas, Carola A.; Hughson, Ward; Pilliod, David S.; Price, Steven J.; Ray, Andrew M.; Sadinski, Walter; Saenz, Daniel; Barichivich, William J.; Brand, Adrianne B,; Brehme, Cheryl S.; Dagit, Rosi; Delaney, Katy S.; Glorioso, Brad M.; Kats, Lee B.; Kleeman, Patrick M.; Pearl, Christopher; Rochester, Carlton J.; Riley, Seth P. D.; Roth, Mark F.; Sigafus, Brent
Miller, D. A. W., Grant, E. H. C., Muths, E., Amburgey, S. M., Adams, M. J., Joseph, M. B., Waddle, J. H., Johnson, P. J. T., Ryan, M. E., Schmid, B. R., Calhoun, D. L., Davis, C. L., Fisher, R. N., Green, D. M., Hossack, B. R., Rittenhouse, T. A. G., Walls, S. C., Bailey, L. L., Cruickshank, S. S., Fellers, G. M., Gorman, T. A., Haas, C. A., Hughson, W., Pilliod, D. S., Price, S. J., Ray, A. M., Sadinski, W., Saenz, D., Barichivich, W. J., Brand, A. B., Brehme, C. S., Dagit, R., Delaney, K. S., Glorioso, B. M., Kats, L. B., Kleeman, P. M., Pearl, C. A., Rochester, C. J., Riley, S. P. D., Roth, M., and Sigafus, B. H., 2018, Quantifying climate sensitivity and climate-driven change in North American amphibian communities: Nature Communications, v. 9, no. Article number: 3926, p. 1-15. https://doi.org/10.1038/s41467-018-06157-6

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Year Published: 2018

California sea otter (Enhydra lutris nereis) census results, spring 2018

The 2018 census of southern sea otters (Enhydra lutris nereis) was conducted from late April to mid-May along the mainland coast of central California and in April at San Nicolas Island in southern California. The 3-year average of combined counts from the mainland range and San Nicolas Island was 3,128, a decrease of 58 sea otters from the...

Hatfield, Brian B.; Yee, Julie L.; Kenner, Michael C.; Tomoleoni, Joseph A.; Tinker, M. Tim
Hatfield, B.B., Yee, J.L., Kenner, M.C., Tomoleoni, J.A., and Tinker, M.T., 2018, California sea otter (Enhydra lutris nereis) census results, spring 2018: U.S. Geological Survey Data Series 1097, 10 p., https://doi.org/10.3133/ds1097.

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Year Published: 2018

Integrated diet analyses reveal contrasting trophic niches for wild and hatchery juvenile Chinook Salmon in a large river delta

Hatchery programs have been used as a conservation tool to bolster declining populations of Chinook Salmon Oncorhynchus tshawytscha along much of the North American Pacific coast. In many watersheds, hatchery stocks are released concurrently with the wild population, thus raising the potential for density‐dependent effects. Competition...

Davis, Melanie J.; Woo, Isa; Ellings, Christopher S.; Hodgson, Sayre; Beauchamp, David A.; Nakai, Glynnis; De La Cruz, Susan E.W.

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Year Published: 2018

Toward salt marsh harvest mouse recovery: A review

The salt marsh harvest mouse (SMHM, Reithrodontomys raviventris) is an endangered species, endemic to the San Francisco Estuary. Despite being protected for almost half a century and being included in a large number of recovery, restoration, and management plans, significant data gaps hinder conservation and management of the species, a...

Smith, Katherine R.; Riley, Melissa K.; Barthman-Thompson, Laureen; Woo, Isa; Statham, Mark J.; Estrella, Sarah; Kelt, Douglas A.
Smith, K. R, Riley, M. K, Barthman–Thompson, L., Woo, I., Statham, M. J, Estrella, S., & Kelt, D. A. (2018). Towards Salt Marsh Harvest Mouse Recovery: A Review. San Francisco Estuary and Watershed Science, 16(2). https://doi.org/10.15447/sfews.2018v16iss2art2

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Year Published: 2018

Collision and displacement vulnerability to offshore wind energy infrastructure among marine birds of the Pacific Outer Continental Shelf

Marine birds are vulnerable to collision with and displacement by offshore wind energy infrastructure (OWEI). Here we present the first assessment of marine bird vulnerability to potential OWEI in the California Current System portion of the U.S. Pacific Outer Continental Shelf (POCS). Using population size, demography, life history,...

Kelsey, Emily C.; Felis, Jonathan J.; Czapanskiy, Max; Peresksta, David M.; Adams, Josh
Emma C. Kelsey, Jonathan J. Felis, Max Czapanskiy, David M. Pereksta, Josh Adams, Collision and displacement vulnerability to offshore wind energy infrastructure among marine birds of the Pacific Outer Continental Shelf, Journal of Environmental Management, Volume 227, 2018, Pages 229-247, ISSN 0301-4797, https://doi.org/10.1016/j.jenvman.2018.08.051.

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Year Published: 2018

Prioritizing conserved areas threatened by wildfire and fragmentation for monitoring and management

In many parts of the world, the combined effects of habitat fragmentation and altered disturbance regimes pose a significant threat to biodiversity. This is particularly true in Mediterranean-type ecosystems (MTEs), which tend to be fire-prone, species rich, and heavily impacted by human land use. Given the spatial complexity of overlapping...

Tracey, Jeff A.; Rochester, Carlton J.; Hathaway, Stacie A.; Preston, Kristine L.; Syphard, Alexandra D.; Vandergast, Amy G.; Diffendorfer, James E.; Franklin, Janet; MacKenzie, Jason B.; Oberbauer, Tomas A.; Tremor, Scott; Winchell, Clark S.; Fisher, Robert N.
Tracey JA, Rochester CJ, Hathaway SA, Preston KL, Syphard AD, Vandergast AG, et al. (2018) Prioritizing conserved areas threatened by wildfire and fragmentation for monitoring and management. PLoS ONE 13(9): e0200203. https://doi.org/10.1371/journal.pone.0200203

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Year Published: 2018

Carotenoid-based skin ornaments reflect foraging propensity in a seabird, Sula leucogaster

Carotenoid-based ornaments are common signalling features in animals. It has long been proposed that such ornaments communicate information about foraging abilities to potential mates. However, evidence linking foraging with ornamentation is largely missing from unmanipulated, free-ranging populations. To investigate this relationship, we studied...

Michael, Nathan P.; Torres, Roxana; Welch, Andreanna J.; Adams, Josh; Erandi Bonillas-Monge, Mario; Felis, Jonathan J.; Lopez-Marquez, Laura; Martínez-Flores, Alejandro; Wiley, Anne E.
Michael NP, Torres R, Welch AJ, Adams J, Bonillas-Monge ME, Felis J, Lopez-Marquez L, Martı´nez-Flores A, Wiley AE. 2018 Carotenoid-based skin ornaments reflect foraging propensity in a seabird, Sula leucogaster. Biol. Lett. 14: 20180398. http://dx.doi.org/10.1098/rsbl.2018.0398

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Year Published: 2018

Conservation genomics of the Mogollon Narrow-headed gartersnake (Thamnophis rufipunctatus) and Northern Mexican gartersnake (Thamnophis eques megalops)

The ability of populations to persist and adapt to abiotic and biotic changes is reliant on genetic diversity. When connectivity across a species landscape is disrupted, the levels and distribution of genetic diversity can rapidly deteriorate as a result of genetic drift, leading to increased inbreeding and reduced adaptive potential. Therefore,...

Wood, Dustin A.; Emmons, Iain D.; Nowak, Erika M.; Christman, Bruce L.; Holycross, Andrew T.; Vandergast, Amy G.
Wood, D.A., Emmons, I.D., Nowak, E.M., Christman, B.L., Holycross, A.T., Jennings, R.D., and Vandergast, A.G., 2018, Conservation genomics of the Mogollon Narrow-headed gartersnake (Thamnophis rufipunctatus) and Northern Mexican gartersnake (Thamnophis eques megalops): U.S. Geological Survey Open-File Report 2018-1141, 47 p., https://doi.org/10.3133/ofr20181141.