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Browse more than 160,000 publications authored by our scientists over the past 100+ year history of the USGS.  Publications available are: USGS-authored journal articles, series reports, book chapters, other government publications, and more.

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Filter Total Items: 175547

Speleothem evidence for Late Miocene extreme Arctic amplification – An analogue for near-future anthropogenic climate change? Speleothem evidence for Late Miocene extreme Arctic amplification – An analogue for near-future anthropogenic climate change?

The Miocene provides an excellent climatic analogue for near-future runaway anthropogenic warming, with atmospheric CO2 concentrations and global average temperatures similar to those projected for the coming century under extreme-emissions scenarios. However, the magnitude of Miocene Arctic warming remains unclear due to the scarcity of reliable proxy data. Here we use stable oxygen...
Authors
Stuart Umbo, Franziska Lechleitner, Thomas Opel, Sevasti Modestou, Tobias Braun, Anton Vaks, Gideon Henderson, Pete Scott, Alexander Osintzev, Alexander Kononov, Irina Adrian, Yuri Dublyansky, Alena Maria Giesche, Sebastian F.M. Breitenbach
By
Alaska Science Center

Avak Creek oil occurrence, North Slope, Alaska: Newly discovered oil seep on Native lands, near village of Utqiagvik Avak Creek oil occurrence, North Slope, Alaska: Newly discovered oil seep on Native lands, near village of Utqiagvik

An unknown occurrence of oil was detected near Avak Creek on Native lands on the North Slope of Alaska. Determining the source of oil was imperative for allowing stakeholders (Federal, State, and local government agencies and the landowner, an Alaska Native corporation) to make timely and informed decisions and mount a mitigation response, if required. The regional and local geological...
Authors
Palma J. Botterell, David W Houseknecht, Jody Brae Wycech, J. Mike Moldowan, Paul G. Lillis, Rebecca A. Smith, Kimberley Maher
By
Energy Resources Program, Central Energy Resources Science Center, Geology, Energy & Minerals Science Center

Simple bagged movement models for telemetry data Simple bagged movement models for telemetry data

Determining which statistical methods are appropriate for data is both user and data dependent and prone to change as new methodology becomes available. This process encompasses model ideation, model selection, and determining appropriate use of statistical methods. Literature on models for animal movement emerging in the past two decades has yielded a rich collection of statistical...
Authors
Andrew B. Whetten, Trevor J. Hefley, David A. Haukos, Dustin E. Brewer
By
Cooperative Research Units

Chinook salmon Oncorhynchus tshawytscha (Walbaum, 1792) life history influences how diagnostic cranial structures relate to fish length Chinook salmon Oncorhynchus tshawytscha (Walbaum, 1792) life history influences how diagnostic cranial structures relate to fish length

Diagnostic bones can aid in identification and size determination of fishes from ingested prey, archaeological remains or damaged specimens. We extracted diagnostic structures, including cleithra, dentaries, opercles and otoliths, from juvenile spring Chinook salmon (Oncorhynchus tshawytscha) from three distinct groups: hatchery, naturally produced and surrogate, representing shared...
Authors
Jeremy D. Romer, Kevin A. Stertz, Keiara Pham, Christina Amy Murphy
By
Cooperative Research Units

Reducing bias in shorebird nest survival rates across a large Arctic landscape Reducing bias in shorebird nest survival rates across a large Arctic landscape

Reproductive success is a key demographic parameter that can have profound impacts on a species' population trend. Indeed, poor reproductive success has been suggested as a contributing factor to the declines observed in many species of birds, including Arctic-breeding shorebirds. However, the available information on Arctic-breeding shorebird nest survival is restricted to a limited...
Authors
Sarah T. Saalfeld, Emily L. Weiser, Stephen C. Brown, Christopher Latty, Shiloh Schulte, R. B. Lanctot
By
Alaska Science Center

Small fish, big implications: Considerations for an ecosystem approach to capelin fisheries management Small fish, big implications: Considerations for an ecosystem approach to capelin fisheries management

Climate-driven changes in the Subarctic will directly impact capelin populations and the ecosystem they inhabit, including their predators, prey, and physical habitats. Consequently, incorporating ecosystem considerations in future capelin fisheries management is crucial. In this study, a multidisciplinary group of experts critically evaluated whether the current capelin stock assessment...
Authors
Warsha Singh, John T. Trochta, Hannah M. Hannah M. Murphy, David W. McGowan, Aaron T. Adamack, Mayumi L. Arimitsu, Birkir Barðarson, Höskuldur Björnsson, Bjarte Bogstad, Mathieu Boudreau, Catherine Chambers, Harald Gjøsæter, Teunis Jansen, Sigurður Þ. Jónsson, Sturla Kvamsdal, Ron S. Lewis, Nina Mikkelsen, Torstein Pedersen, Anna H. Olafsdottir, Maartje Oostdijk, Teresa Silva, Georg Skaret, Robert M. Suryan, Sam Subbey
By
Alaska Science Center
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