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Filter Total Items: 634
Date published: March 22, 2016

Hierarchical Models for Computing Inferences About Species Assemblages Subject to Imperfect Detection

USGS is developing strategies to model species assemblages to allow inferences to be made about individual species, local communities of species, or for an entire metacommunity of species - while accounting for errors in species detection during sampling.

Date published: March 22, 2016
Status: Active

Connectivity of Tropical Marine Ecosystems: Understanding Biodiversity and Trophic Relationships in the Virgin Islands and Puerto Rico

Marine reserves and protected areas in the U.S. Virgin Islands and Puerto Rico encompass a variety of tropical ecosystems, including coral reefs, mangroves, and seagrass beds, but questions remain regarding how effective these areas are at preserving and protecting the habitats and species they encompass. USGS and collaborators address this question by examining the biodiversity and food web...

Date published: March 22, 2016
Status: Completed

Assessing the Past and Potential Future Impacts of Salt Water Intrusion on Tidal Swamp Habitat along the South Atlantic Coast

Using historical aerial photogrammetry, satellite imagery, or recent vegetation mapping efforts, as well as various models, USGS investigates salt water intrusion impacts on coastal habitats along the southern Atlantic coast. 

Date published: March 18, 2016

Green-Tree Reservoir management practices within the U.S. Fish and Wildlife Service National Wildlife Refuge System

Green-Tree Reservoirs are used as a management tool by National Wildlife Refuges throughout the Southeast United States, but data suggests that forest productivity has declined in these areas. USGS investigates the effects of climate and flooding on tree growth and mortality to assist refuge managers adapt management strategies. 

Contacts: Richard Day
Date published: March 18, 2016

Establishing Explicit Biological Objectives to Guide Strategic Habitat Conservation for the Gulf Coast

To inform conservation efforts for the Gulf Coast, USGS is developing a suite of decision support tools to provide explicit population and habitat objectives.

Date published: March 18, 2016

Response of a Threatened Shorebird to Severe Storms

The federally protected Atlantic Coast Piping Plover relies on habitats that were affected by Hurricane Sandy. USGS works to understand how these changes have affected nesting habitat and the reproductive success of the shorebird.

Date published: March 18, 2016
Status: Active

An Inventory and Comparative Study of Bees, A Keystone Ecological Group in the Endangered Coastal Prairie of Louisiana

Much of Louisiana's coastal prairie has been converted to rice and sugarcane cultivation. USGS is inventorying bee populations in these areas to explore how effective restoration efforts have been.

Contacts: Larry Allain
Date published: March 18, 2016
Status: Active

Population Monitoring of the Federally Threatened Okaloosa Darter at Eglin Air Force Base

USGS' and Loyola University New Orleans' innovative research techniques played a role in the decision to downlist the Okaloosa Darter, a freshwater fish endemic to northwest Florida, from Endangered to Threatened.

Contacts: Howard Jelks
Date published: March 18, 2016

Long-Term Carbon Burial in Marshes of the Mississippi River Delta

Wetlands along the Gulf of Mexico coast play an important role in the global carbon cycle, but as they  rapidly convert to open water, their potential for carbon storage is declining. USGS is working to provide accurate, long-term marsh soil carbon sequestration rates. 

Date published: March 18, 2016
Status: Active

Classifying Coastal Wetland Vegetation Communities with Unsupervised Artificial Neural Networks

Wetlands are often classified by their vegetation, which can help scientists track how these landscapes change over time. USGS turns to unsupervised artificial neural networks to help guide this classification process.

Date published: March 18, 2016

An investigation of aquatic invasive species in pristine sites in the Greater Yellowstone Area

Aquatic invasive species (AIS) are aquatic organisms that move into ecosystems beyond their natural, historic range and cause severe and irreversible damage to the habitats they invade. Most AIS arrive as a direct result of human activity, such as boating and angling. The threat of AIS introduction is especially high in the Greater Yellowstone Area, as humans from all over the world come to...

Contacts: Adam Sepulveda
Date published: March 18, 2016

Potential Impact of Hydrology and Sedimentation Changes to Biodiversity, Dongting Lake, China

Dongting Lake, one of the wetlands that make up the floodplains of China's Yangtze River, is important habitat for migratory waterfowl and other wildlife. However, the re-engineering of the water way and the intensification of agricultural practices has contributed to changes in hydrology and sedimentation. USGS and partners from China are assessing the potential impact of these changes to the...

Filter Total Items: 2,344
Year Published: 2015

Fire modulates climate change response of simulated aspen distribution across topoclimatic gradients in a semi-arid montane landscape

Content Changing aspen distribution in response to climate change and fire is a major focus of biodiversity conservation, yet little is known about the potential response of aspen to these two driving forces along topoclimatic gradients. Objective This study is set to evaluate how aspen distribution might shift in response to different climate-...

Yang, Jian; Weisberg, Peter J.; Shinneman, Douglas; Dilts, Thomas E.; Earnst, Susan L.; Scheller, Robert M
Yang, J., Weisberg, P., Shinneman, D.J., Dilts, T.E., Earnst, S.L., Scheller, R.M., 2015, Fire modulates climate change response of simulated aspen distribution across topoclimatic gradients in a semi-arid montane landscape. DOI-10.1007/s10980-015-0160-1: Landscape Ecology, p. 21.

Year Published: 2015

Advancing the science of microbial symbiosis to support invasive species management: a case study on Phragmites in the Great Lakes

A growing body of literature supports microbial symbiosis as a foundational principle for the competitive success of invasive plant species. Further exploration of the relationships between invasive species and their associated microbiomes, as well as the interactions with the microbiomes of native species, can lead to key new insights into...

Kowalski, Kurt P.; Bacon, Charles R.; Bickford, Wesley A.; Braun, Heather A.; Clay, Keith; Leduc-Lapierre, Michele; Lillard, Elizabeth; McCormick, Melissa K.; Nelson, Eric; Torres, Monica; White, James W. C.; Wilcox, Douglas A.
Kowalski, K. P., C. Bacon, W. Bickford, H. Braun, K. Clay, M. Leduc-Lapierre, E. Lillard, M. McCormick, E. Nelson, M. Torres, J. White, and D. A. Wilcox. 2015. Advancing the science of microbial symbiosis to support invasive species management: A case study on Phragmites in the Great Lakes. Frontiers in Microbiology 6:95. doi: 10.3389/fmicb.2015.00095

Year Published: 2015

Vegetation and non-native ungulate monitoring at the Big Island National Wildlife Refuge Complex 2010–2014.

The Hakalau Forest Unit (HFU) of Big Island National Wildlife Refuge Complex (BINWRC) has intensively managed feral cattle (Bos taurus) and pigs (Sus scrofa) and monitored non-native ungulate presence and distribution during surveys of all managed areas since 1988. We: 1) provide results from recent ungulate surveys at HFU to determine current...

Hess, Steven C.; Leopold, Christina R.; Kendall, Steven J.
Leopold, C. R., S.C. Hess, and S.J. Kendall. 2015. Vegetation and non-native ungulate monitoring at the Big Island National Wildlife Refuge Complex 2010–2014. Hawaii Cooperative Studies Unit Technical Report. TR HCSU-0062. University of Hawaii at Hilo, 31 pp.

Year Published: 2015

Characterizing the distribution of an endangered salmonid using environmental DNA analysis

Determining species distributions accurately is crucial to developing conservation and management strategies for imperiled species, but a challenging task for small populations. We evaluated the efficacy of environmental DNA (eDNA) analysis for improving detection and thus potentially refining the known distribution of Chinook salmon (Oncorhynchus...

Laramie, Matthew B.; Pilliod, David S.; Goldberg, Caren S.

Year Published: 2015

Intercontinental genetic structure and gene flow in Dunlin (Calidris alpina), a potential vector of avian influenza

Waterfowl (Anseriformes) and shorebirds (Charadriiformes) are the most common wild vectors of influenza A viruses. Due to their migratory behavior, some may transmit disease over long distances. Migratory connectivity studies can link breeding and nonbreeding grounds while illustrating potential interactions among populations that may spread...

Miller, Mark P.; Haig, Susan M.; Mullins, Thomas D.; Ruan, Luzhang; Casler, Bruce; Dondua, Alexei; Gates, River H.; Johnson, J. Matthew; Kendall, Steven J.; Tomkovich, Pavel S.; Tracy, Diane; Valchuk, Olga P.; Lanctot, Richard B.
Miller, M.P., Haig, S.M., Mullins, T.D., Ruan, L., Casler, B., Dondua, A., Gates, R.H., Johnson, J.M., Kendall, S.J., Tomkovich, P.S., Tracy, D., Valchuk, O.P., Lanctot, R.B., 2015, Intercontinental genetic structure and gene flow in Dunlin (Calidris alpina), a potential vector of avian influenza: Evolutionary Applications, v. 8, no. 2, p. 149-171

Year Published: 2015

Value of information in natural resource management: technical developments and application to pink-footed geese

The “value of information” (VOI) is a generic term for the increase in value resulting from better information to guide management, or alternatively, the value foregone under uncertainty about the impacts of management (Yokota and Thompson, Medical Decision Making 2004;24: 287). The value of information can be characterized...

Williams, Byron K.; Johnson, Fred A.
Williams, B. K., and F. A. Johnson. 2015. Value of information in natural resource management: technical developments and application to pink-footed geese. Ecology and Evolution 6:In press.

Year Published: 2015

An experimental investigation of chemical communication in the polar bear

The polar bear (Ursus maritimus), with its wide-ranging movements, solitary existence and seasonal reproduction, is expected to favor chemosignaling over other communication modalities. However, the topography of its Arctic sea ice habitat is generally lacking in stationary vertical substrates routinely used for targeted scent marking in other...

Owen, Megan A.; Swaisgood, Ronald R.; Slocomb, C.; Amstrup, Steven C.; Durner, George M.; Simac, Kristin S.; Pessier, Allan P.

Year Published: 2015

Spring resource phenology and timing of songbird migration across the Gulf of Mexico

Migratory songbirds are advancing their arrival to breeding areas in response to climatic warming at temperate latitudes. Less is understood about the impacts of climate changes outside the breeding period. Every spring, millions of migrating songbirds that overwinter in the Caribbean and Central and South America stop to rest and refuel in the...

Paxton, Eben H.; Cohen, Emily B.; Németh, Zoltan; Zenzal, Theodore J.; Paxton, Kristina L.; Diehl, Robert H.; Moore, Frank R.
Cohen, E.B., Z. Nemeth, T.J. Zenzal, Jr., K.L. Paxton, R. Diehl, and E.H. Paxton. 2015. Spring resource phenology and timing of songbird migration across the Gulf of Mexico. In: Studies in Avian Biology, Edition: No. 47. Phenological synchrony and bird migration: Changing climate and seasonal resources in North America, Eds: Eric M. Wood, Jherime L. Kellermann, CRC Press, London. pp.63-82.

Year Published: 2015

Farallon de Medinilla seabird and Tinian moorhen analyses

This report assesses the trends in brown booby (Sula leucogaster), masked booby (S. dactylatra), and red-footed booby (S. sula) counts collected on Farallon de Medinilla and Mariana common moorhen (Gallinula chloropus guami) counts on Tinian, Commonwealth of the Northern Mariana Islands to help elucidate patterns in bird numbers. During either...

Camp, Richard J.; Leopold, Christina R.; Brinck, Kevin W.; Juola, Franz
Camp, R.J., C. Leopold, K.W. Brinck, and F. Juola. 2014. Farallon de Medinilla seabird and Tinian moorhen analyses. Hawaii Cooperative Studies Unit Technical Report. TR HCSU-0060, 44 pp.

Year Published: 2015

Mortality estimation from carcass searches using the R-package carcass: a tutorial

This article is a tutorial for the R-package carcass. It starts with a short overview of common methods used to estimate mortality based on carcass searches. Then, it guides step by step through a simple example. First, the proportion of animals that fall into the search area is estimated. Second, carcass persistence time is estimated based on...

Korner-Nievergelt, Fränzi; Behr, Oliver; Brinkmann, Robert; Etterson, Matthew A.; Huso, Manuela M. P.; Dalthorp, Daniel; Korner-Nievergelt, Pius; Roth, Tobias; Niermann, Ivo
Korner-Nievergelt, F., Behr, O., Brinkmann, R., Etterson, M., Huso, M., Dalthorp, D., Korner-Nievergelt, P., Roth, T., Niermann, I., 2015, Mortality estimation from carcass searches using the R-package carcass – a tutorial. DOI- 10.2981/wlb.00094: Wildlife Biology, v. 21, p. 30-43.

Year Published: 2015

Plant diversity predicts beta but not alpha diversity of soil microbes across grasslands worldwide

Aboveground–belowground interactions exert critical controls on the composition and function of terrestrial ecosystems, yet the fundamental relationships between plant diversity and soil microbial diversity remain elusive. Theory predicts predominantly positive associations but tests within single sites have shown variable relationships, and...

Prober, Suzanne M.; Leff, Jonathan W.; Bates, Scott T.; Borer, Elizabeth T.; Firn, Jennifer; Harpole, W. Stanley; Lind, Eric M.; Seabloom, Eric W.; Adler, Peter B.; Bakker, Jonathan D.; Cleland, Elsa E.; DeCrappeo, Nicole; DeLorenze, Elizabeth; Hagenah, Nicole; Hautier, Yann; Hofmockel, Kirsten S.; Kirkman, Kevin P.; Knops, Johannes M. H.; La Pierre, Kimberly J.; MacDougall, Andrew S.; McCulley, Rebecca L.; Mitchell, Charles E.; Risch, Anita C.; Schuetz, Martin; Stevens, Carly J.; Williams, Ryan J.; Fierer, Noah
Prober, S.M., Leff, J.W., Bates, S.T., Borer, E.T., Firn, J., Harpole, S., Lind, E., Seabloom, E.W., Adler, P.B., Bakker, J.D., Cleland, E.E., DeCrappeo, N., DeLorenze, E.J., Hagenah, N., Hautier, Y., Hofmockel, K.S., Kirkman, K.P., Knops, J.M., La Pierre, K.J., MacDougall, A.S., McCulley, R., Mitchell, C.E., Risch, A.C., Schuetz, M., Stevens, C.J., Williams, R.J., Fierer, N., 2015, Plant diversity predicts beta but not alpha diversity of soil microbes across grasslands worldwide. DOI- 10.1111/ele.12381: Ecology Letters, v. 18, p. 85-95.

Year Published: 2015

Implications of the circumpolar genetic structure of polar bears for their conservation in a rapidly warming Arctic

We provide an expansive analysis of polar bear (Ursus maritimus) circumpolar genetic variation during the last two decades of decline in their sea-ice habitat. We sought to evaluate whether their genetic diversity and structure have changed over this period of habitat decline, how their current genetic patterns compare with past patterns, and how...

Peacock, Elizabeth L.; Sonsthagen, Sarah A.; Obbard, Martyn E.; Boltunov, Andrei N.; Regehr, Eric V.; Ovsyanikov, Nikita; Aars, Jon; Atkinson, Stephen N.; Sage, George K.; Hope, Andrew G.; Zeyl, Eve; Bachmann, Lutz; Ehrich, Dorothee; Scribner, Kim T.; Amstrup, Steven C.; Belikov, Stanislav; Born, Erik W.; Derocher, Andrew E.; Stirling, Ian; Taylor, Mitchell K.; Wiig, Øystein; Paetkau, David; Talbot, Sandra L.

Filter Total Items: 552
Managed Oregon forest landscape
March 31, 2001

Managed forest landscape

Looking down on a managed forest landscape in Oregon.

Remnants of a spruce forest
December 31, 1969

Remnants of a spruce forest

Remnants of a spruce forest complex following a severe wildfire in the Yukon Flats National Wildlife Refuge, Alaska. Wildfires are the dominant landscape-scale disturbance operating at annual time scales in Alaska, and fires play a major role in the rate and extent of vegetation growth and productivity of a site. Wildland fires typically result in the reduction of

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Erosion along Alaska’s Arctic coastline near the village of Kaktovik
December 31, 1969

Erosion along Alaska’s Arctic coastline near the village of Kaktovik

Neal Pastick – lead author of the study – investigating erosion along Alaska’s Arctic coastline near the village of Kaktovik. Permafrost-dominated coasts of Alaska have drastically changed as the result of coastal transgression and storm-surge flooding which can result in the loss of cultural sites and damage to infrastructure.  Photo by M. Torre Jorgenson

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USGS
May 11, 2018

Webinar on Mercury in Reservoirs - February 14th Webinar Flyer

Flyer for webinar on Weds. Feb. 14 – Mercury transport and bioaccumulation in California reservoirs affected by historical gold mining

USGS
May 15, 2018

Webinar on Mercury in Reservoirs - February 28th Webinar References

Webinar on Mercury in Reservoirs - February 28th Webinar References

Comparison of traditional and thermal imagery to show mange.

Comparison of traditional and thermal imagery to show mange.

Thermal imagery is one tool to assist researchers in measuring temperature loss from the mange patches (red) and compare this with temperature loss from natural fur (blues and greens). As you can see in the two contrasting images, the hairless areas associated with mange are much easier to see using thermal imagery due to heat loss versus a standard photograph from a

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