Ecosystems

Publications

Filter Total Items: 32,090
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Year Published: 2020

The historical context of contemporary climatic adaptation: A case study in the climatically dynamic and environmentally complex southwestern United States

The process of adaptation can be highly dependent upon historical and contemporary factors, especially in environmentally and topographically complex regions affected by Pleistocene glaciations. Here, we investigate Hilaria jamesii (Poaceae), a dryland C4 graminoid, to test how patterns of adaptive genetic variation are linked to...

Massatti, Robert; Knowles, L. Lacey

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Year Published: 2020

Kelp forest monitoring at Naval Base Ventura County, San Nicolas Island, California: Fall 2017 and Spring 2018, Fourth Annual Report

To assess and track changes to the rocky subtidal communities surrounding San Nicolas Island, the U.S. Navy entered into an agreement with the U.S. Geological Survey (USGS) in 2014 to conduct an ecological monitoring program at several sites around the island. Four permanent sites—Nav Fac 100, West End, Dutch Harbor, and Daytona 100—were...

Kenner, Michael C.; Tomoleoni, Joseph
Kenner, M.C., and Tomoleoni, J., 2020, Kelp forest monitoring at Naval Base Ventura County, San Nicolas Island, California: Fall 2017 and Spring 2018, Fourth Annual Report: U.S. Geological Survey Open-File Report 2019–1147, 76 p., https://doi.org/10.3133/ofr20191147.

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Year Published: 2020

Distribution and abundance of Least Bell’s Vireos (Vireo bellii pusillus) and Southwestern Willow Flycatchers (Empidonax traillii extimus) on the Middle San Luis Rey River, San Diego County, southern California—2019 data summary

We surveyed for Least Bell’s Vireos (Vireo bellii pusillus; vireo) along the San Luis Rey River, between College Boulevard in Oceanside and Interstate 15 in Fallbrook, California (middle San Luis Rey River), in 2019, and we surveyed and conducted nest monitoring for Southwestern Willow Flycatchers (Empidonax traillii extimus; flycatcher) in a...

Allen, Lisa D.; Kus, Barbara E.
Allen, L.D. and Kus, B.E., 2020, Distribution and abundance of Least Bell’s Vireos (Vireo bellii pusillus) and Southwestern Willow Flycatchers (Empidonax traillii extimus) on the Middle San Luis Rey River, San Diego County, southern California—2019 data summary: U.S. Geological Survey Data Series 1122, 11 p., https://doi.org/10.3133/ds1122.

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Year Published: 2020

Extreme mortality and reproductive failure of common murres resulting from the northeast Pacific marine heatwave of 2014-2016

About 62,000 dead or dying common murres (Uria aalge), the trophically dominant fish-eating seabird of the North Pacific, washed ashore between summer 2015 and spring 2016 on beaches from California to Alaska. Most birds were severely emaciated and, so far, no evidence for anything other than starvation was found to explain this mass mortality....

Piatt, John F.; Parrish, Julia K.; Renner, Heather M.; Schoen, Sarah K.; Jones, Timothy; Arimitsu, Mayumi L.; Kuletz, Kathy J.; Bodenstein, Barbara; Garcia-Reyes, Marisol; Duerr, Rebecca; Corcoran, Robin; Kaler, Robb S.A.; McChesney, Gerard J.; Golightly, Richard T.; Coletti, Heather A.; Suryan, Robert M.; Burgess, Hillary K.; Lindsey, Jackie; Lindquist, Kirsten; Warzybok, Peter; Jahncke, Jaime; Roletto, Jan; Sydeman, William J.

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Year Published: 2020

A round-robin evaluation of the repeatability and reproducibility of environmental DNA assays for dreissenid mussels

Resource managers may be hesitant to make decisions based on environmental (e)DNA results alone since eDNA is an indirect method of species detection. One way to reduce the uncertainty of eDNA is to identify laboratory‐based protocols that ensure repeatable and reproducible results. We conducted a double‐blind round‐robin analysis of probe‐based...

Sepulveda, Adam J.; Hutchins, Patrick R.; Jackson, Craig; Ostberg, Carl; Laramie, Matthew; Amberg, Jon J.; Counihan, Timothy; Hoegh, Andrew B.; Pilliod, David

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Year Published: 2020

Mercury and selenium concentrations in fishes of the Upper Colorado River Basin, southwestern United States: A retrospective assessment

Mercury (Hg) and selenium (Se) are contaminants of concern for fish in the Upper Colorado River Basin (UCRB). We explored Hg and Se in fish tissues (2,324 individuals) collected over 50 years (1962–2011) from the UCRB. Samples include native and non-native fish collected from lotic waterbodies spanning 7 major tributaries to the Colorado River....

Day, Natalie; Schmidt, Travis; Roberts, James J.; Osmundson, Barbara C.; Willacker, James; Eagles-Smith, Collin

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Year Published: 2020

Challenges for leveraging citizen science to support statistically robust monitoring programs

Large samples and long time series are often needed for effective broad-scale monitoring of status and trends in wild populations. Obtaining those sample sizes can be more feasible when volunteers contribute to the dataset, but volunteer-selected sites are not always representative of a population. Previous work to account for biased site...

Weiser, Emily L.; Diffendorfer, James E.; Lopez-Hoffman, Laura; Semmens, Darius J.; Thogmartin, Wayne E.

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Year Published: 2020

Forest protection criteria within the Mississippi Alluvial Valley

The nearly ubiquitous bottomland hardwood forests that historically dominated the Mississippi Alluvial Valley have been greatly reduced in area. In addition, changes in hydrology and forest management have altered the structure and composition of the remaining forests. To ameliorate the detrimental impact of these changes on wildlife, conservation...

Elliott, A. Blaine; Mini, Anne E.; McKnight, S. Keith; Twedt, Daniel J.

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Year Published: 2020

Remnant hardwood forest mapping within the Upper Mississippi River Floodplain

Executive SummaryThe primary objective of the project was to locate previously unknown stands of mast-producing hardwood forest trees in the Upper Mississippi River floodplain using existing information. We located and mapped 399 previously unknown hardwood forest stands within the Mississippi River floodplain area of navigation pools 9, 10, and...

Hanson, Jenny L.; King, Rich; Hoy, Erin E.
Hanson, J.L., King, R., Hoy, E.E., 2019, Remnant hardwood forest mapping within the Upper Mississippi River Flood-plain: U.S. Geological Survey Open-File Report 2019–1089, 10 p., https://doi.org/10.3133/ofr20191089.

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Year Published: 2020

Economic impacts of Wyoming Landscape Conservation Initiative Conservation projects in Wyoming

Executive SummaryThis report estimates the economic impacts on the Wyoming economy from investments made by the Wyoming Landscape Conservation Initiative (WLCI) on conservation and restoration projects. The WLCI has been working in southwestern Wyoming since 2007 to coordinate science and management decisions among government and private entities...

Huber, Christopher; Flyr, Matthew; Cullinane Thomas, Catherine
Huber, C., Flyr, M., and Cullinane Thomas, C., 2020, Economic impacts of Wyoming Landscape Conservation Initiative conservation projects in Wyoming: U.S. Geological Survey Open-File Report 2019–1135, 11 p., https://doi.org/10.3133/ofr20191135

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Year Published: 2020

Sustaining Environmental Capital Initiative summary report

Federal agencies need credible scientific information to determine the production and value of ecosystem services in an efficient and timely manner. The U.S. Geological Survey addresses this scientific information need through the Sustaining Environmental Capital Initiative project. The project has relied on U.S. Geological Survey expertise...

Huber, Christopher; Meldrum, James R.; Schuster, Rudy M.; Ancona, Zachary H.; Bagstad, Kenneth J.; Beck, Scott M.; Carlisle, Daren M.; Claggett, Peter R.; Franco, Fabiano; Galbraith, Heather S.; Haefele, Michelle; Hoelting, Kristin R; Hogan, Dianna M.; Hopkins, Kristina G.; Kern, Tim; Lawrence, Collin B.; Lischka, Stacy; Loomis, John B.; Mueller, Julie M.; Noe, Gregory B.; Pindilli, Emily J.; Quay, Brian; Semmens, Darius J.; Sinclair, Wilson; Spooner, Daniel E.; Voigt, Brian; St. John White, Barabara
Huber, C., Meldrum, J.R., Schuster, R.M., Ancona, Z.H., Bagstad, K.J., Beck, S.M., Carlisle, D.M., Claggett, P.R., Franco, F., Galbraith, H.S., Haefele, M., Hoelting, K.R., Hogan, D.M., Hopkins, K.G., Kern, T., Lawrence, C.B., Lischka, S., Loomis, J.B., Mueller, J.M., Noe, G.B., Pindilli, E.J., Quay, B., Semmens, D.J., Sinclair, W., Spooner, D.E., Voigt, B., and St. John White, B., 2020, Sustaining Environmental Capital Initiative summary report: U.S. Geological Survey Open-File Report 2019–1117, 23 p., https://doi.org/10.3133/ofr20191117.

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Year Published: 2020

Trends of litter decomposition and soil organic matter stocks across forested swamp environments of the southeastern US

A common idea in the discussion of soil carbon processes is that litter decomposition rates and soil carbon stocks are inversely related. To test this overall hypothesis, simultaneous studies were conducted of the relationship of environmental gradients to leaf and wood decomposition, buried cloth decomposition and percent soil organic matter in...

Middleton, Beth A.