Ecosystems

Publications

Filter Total Items: 32,253
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Year Published: 2020

Soil surface elevation dynamics in a mangrove-to-marsh ecotone characterized by vegetation shifts

Mangrove forest encroachment into coastal marsh habitats has been described in subtropical regions worldwide in recent decades. To better understand how soil processes may influence vegetation change, we studied soil surface elevation change, accretion rates, and soil subsurface change across a coastal salinity gradient in Florida, USA, an area...

Howard, Rebecca J.; From, Andrew; Krauss, Ken W.; Andres, Kimberly D.; Cormier, Nicole; Allain, Larry K.; Savarese, Michael

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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

Phosphorus, nitrogen and dissolved organic carbon fluxes from sediments in freshwater rivermouths entering Green Bay (Lake Michigan; USA)

Transitional areas between ecosystem types are often active biogeochemically due to resource limitation changes. Lotic-to-lentic transitions in freshwaters appear active biogeochemically, but few studies have directly measured nutrient processing rates to assess whether processing within the rivermouth is important for load estimates or the local...

Larson, James H.; James, William F.; Fitzpatrick, Faith A.; Frost, Paul C.; Evans, Mary Anne; Reneau, Paul C.; Xenopoulos, Marguerite A.

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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

Habitat of the endangered salt marsh harvest mouse (Reithrodontomys raviventris) in San Francisco Bay

Understanding habitat associations is vital for conservation of at‐risk marsh‐endemic wildlife species, particularly those under threat from sea level rise. We modeled environmental and habitat associations of the marsh‐endemic, Federally endangered salt marsh harvest mouse (Reithrodontomys raviventris, RERA) and co‐occurrence with eight...

Marcot, Bruce G.; Woo, Isa; Thorne, Karen M.; Freeman, Chase; Guntenspergen, Glenn R.

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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

Dermal denticle assemblages in coral reef sediments correlate with conventional shark surveys

1. It is challenging to assess long-term trends in mobile, long-lived, and relatively rare species such as sharks. Despite ongoing declines in many coastal shark populations, conventional surveys might be too fleeting and too recent to describe population trends over decades to millennia. Placing recent shark declines into historical context...

Dillon, Erin M.; Lafferty, Kevin D.; McCauley, Douglas J.; Bradley, Darcy; Norris, Richard D.; Caselle, Jennifer E.; DiRenzo, Graziella V.; Gardner, Jonathan P.A.; O'Dea, Aaron

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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.