Habitat use by fishes of Lake Superior. I. Diel patterns of habitat use in nearshore and offshore waters of the Apostle Islands region
O. T. Gorman, D.L. Yule, J.D. Stockwell
2012, Aquatic Ecosystem Health & Management (15) 333-354
Diel patterns of distribution of fishes in nearshore (15–80 m depth) and offshore (>80 m) waters of the Apostle Islands region of Lake Superior were described using bottom trawls, mid-water trawls, and acoustic gear during day and night sampling. These data revealed three types of diel migration: diel vertical migration (DVM), diel...
Deep Arctic Ocean warming during the last glacial cycle
T. M. Cronin, G. S. Dwyer, J. Farmer, H.A. Bauch, R.F. Spielhagen, M. Jakobsson, J. Nilsson, W. M. Briggs Jr., A. Stepanova
2012, Nature Geoscience (5) 631-634
In the Arctic Ocean, the cold and relatively fresh water beneath the sea ice is separated from the underlying warmer and saltier Atlantic Layer by a halocline. Ongoing sea ice loss and warming in the Arctic Ocean have demonstrated the instability of the halocline, with implications for further sea ice...
Arctic shorebirds in North America: A decade of monitoring
Jonathan R. Bart, Victoria H. Johnston, editor(s)
2012, Studies in Avian Biology 44
Each year shorebirds from North and South America migrate thousands of miles to spend the summer in the Arctic. There they feed in shoreline marshes and estuaries along some of the most productive and pristine coasts anywhere. With so much available food they are able to reproduce almost explosively; and...
Effects of supplemental feeding and aggregation on fecal glucocorticoid metabolite concentrations in elk
Victoria E. Forristal, Scott Creel, Mark L. Taper, Brandon M. Scurlock, Paul C. Cross
2012, Journal of Wildlife Management (76) 76-4
Habitat modifications and supplemental feeding artificially aggregate some wildlife populations, with potential impacts upon contact and parasite transmission rates. Less well recognized, however, is how increased aggregation may affect wildlife physiology. Crowding has been shown to induce stress responses, and increased glucocorticoid (GC) concentrations can reduce immune function and increase...
Golden Gate Bridge response: a study with low-amplitude data from three earthquakes
Mehmet Çelebi
2012, Earthquake Spectra (28) 487-510
The dynamic response of the Golden Gate Bridge, located north of San Francisco, CA, has been studied previously using ambient vibration data and finite element models. Since permanent seismic instrumentation was installed in 1993, only small earthquakes that originated at distances varying between ~11 to 122 km have been recorded....
Effects of low-density feeding on elk–fetus contact rates on Wyoming feedgrounds
Tyler G. Creech, Paul C. Cross, Brandon M. Scurlock, Eric Maichak, Jared D. Rogerson, John C. Henningsen, Scott Creel
2012, Journal of Wildlife Management (76) 877-886
High seroprevalance for Brucella abortus among elk on Wyoming feedgrounds suggests that supplemental feeding may influence parasite transmission and disease dynamics by altering the rate at which elk contact infectious materials in their environment. We used proximity loggers and video cameras to estimate rates of elk-to-fetus contact (the primary source...
Dwarf char, a new form of chars (the genus Salvelinus) in Lake Kronotskoe
S.D. Pavlov, E.A. Pivovarov, Carl O. Ostberg
2012, Doklady Biological Sciences (442) 20-23
Lake Kronotskoe is situated in the Kronotskii State Nature Reserve and is a unique natural heritage of Kamchatka. The lake–river system of the reserve includes numerous springs and small streams and three large inflowing rivers, Listvennichnaya, Unana, and Uzon, which form the main bays of...
Fragilariopsis diatom evolution in Pliocene and Pleistocene Antarctic shelf sediments
Charlotte Sjunneskog, Christina Riesselman, Diane Winter, Reed Scherer
2012, Micropaleontology (58) 273-289
The late Pliocene – early Pleistocene sediment record in the AND-1B core from the McMurdo Sound, Ross Sea, Antarctica, displays a rich diversity and high abundance of diatoms, including several new morphologies within the genus Fragilariopsis. These new morphologies exhibit similarities to the extinct late Miocene/early Pliocene species Fragilariopsis aurica...
Dinocyst taphonomy, impact craters, cyst ghosts, and the Paleocene-Eocene thermal maximum (PETM)
Lucy E. Edwards
2012, Palynology (36) 80-95
Dinocysts recovered from sediments related to the Chesapeake Bay impact structure in Virginia and the earliest Eocene suboxic environment in Maryland show strange and intriguing details of preservation. Features such as curled processes, opaque debris, breakage, microborings and cyst ghosts, among others, invite speculation about catastrophic depositional processes, rapid burial...
Ages of pre-rift basement and synrift rocks along the conjugate rift and transform margins of the Argintine Precordillera and Laurentia
William A. Thomas, Robert D. Tucker, Ricardo A. Astini, Rodger E. Denison
2012, Geosphere (8) 1366-1383
New geochronologic data from basement rocks support the interpretation that the Argentine Precordillera (Cuyania) terrane was rifted from the Ouachita embayment of the Iapetan margin of Laurentia. New data from the Ozark dome show a range of ages in two groups at 1466 ± 3 to 1462 ± 1 Ma...
Correlation of resource plays and biodiversity patterns: accumulation of organic-rich shale tracks taxonomic turnover
Jennifer D. Eoff
2012, GCAGS Journal (1) 1-12
Similar paleogeographic and paleotectonic settings characterize most self-sourced shale hydrocarbon plays. Their deposition occurred within similar orders of magnitude of eustatic events and during geologic periods characterized by “warm” (or transitional) climates and calcitic seas. In addition, the stratigraphic occurrence of shale plays parallels certain historical patterns of marine metazoan...
Assessing confidence in Pliocene sea surface temperatures to evaluate predictive models
Harry J. Dowsett, Marci M. Robinson, Alan M. Haywood, Daniel J. Hill, Aisling M. Dolan, Danielle K. Stoll, Wing-Le Chan, Ayako Abe-Ouchi, Mark A. Chandler, Nan A. Rosenbloom, Bette L. Otto-Bliesner, Fran J. Bragg, Daniel J. Lunt, Kevin M. Foley, Christina R. Riesselman
2012, Nature Climate Change (2) 365-371
In light of mounting empirical evidence that planetary warming is well underway, the climate research community looks to palaeoclimate research for a ground-truthing measure with which to test the accuracy of future climate simulations. Model experiments that attempt to simulate climates of the past serve to identify both similarities and...
Inter-laboratory calibration of natural gas round robins for δ2H and δ13C using off-line and on-line techniques
Jinxing Dai, Xinyu Xia, Zhisheng Li, Dennis D. Coleman, Robert F. Dias, Ling Gao, Jian Li, Andrei Deev, Jin Li, Daniel Dessort, Dominique Duclerc, Liwu Li, Jinzhong Liu, Stefan Schloemer, Wenlong Zhang, Yunyan Ni, Guoyi Hu, Xiaobo Wang, Yongchun Tang
2012, Chemical Geology (310-311) 49-55
Compound-specific carbon and hydrogen isotopic compositions of three natural gas round robins were calibrated by ten laboratories carrying out more than 800 measurements including both on-line and off-line methods. Two-point calibrations were performed with international measurement standards for hydrogen isotope ratios (VSMOW and SLAP) and carbon isotope ratios (NBS 19...
The 2009 eruption of Redoubt Volcano, Alaska
Katharine F. Bull, Cheryl Cameron, Michelle L. Coombs, Angie Diefenbach, Taryn Lopez, Steve McNutt, Christina A. Neal, Allison Payne, John A. Power, David J. Schneider, William E. Scott, Seth Snedigar, Glenn Thompson, Kristi L. Wallace, Christopher F. Waythomas, Peter Webley, Cynthia A. Werner
Janet R. Schaefer, editor(s)
2012, Report of Investigations of the Alaska Department of Natural Resources, Division of Geological & Geophysical Surveys 2011-5
Redoubt Volcano, an ice-covered stratovolcano on the west side of Cook Inlet, erupted in March 2009 after several months of escalating unrest. The 2009 eruption of Redoubt Volcano shares many similarities with eruptions documented most recently at Redoubt in 1966–68 and 1989–90. In each case, the eruptive phase lasted several...
Estimating the benefits of land imagery in environmental applications: a case study in nonpoint source pollution of groundwater
Richard L. Bernknopf, William M. Forney, Ronald P. Raunikar, Shruti K. Mishra
Ramanan Laxminarayan, Molly K. Maccauley, editor(s)
2012, Book chapter, The value of information
Moderate-resolution land imagery (MRLI) is crucial to a more complete assessment of the cumulative, landscape-level effect of agricultural land use and land cover on environmental quality. If this improved assessment yields a net social benefit, then that benefit reflects the value of information (VOI) from MRLI. Environmental quality and the...
Chapter two: Phenomenology of tsunamis II: Scaling, event statistics, and inter-event triggering
Eric L. Geist
2012, Advances in Geophysics (53) 35-92
Observations related to tsunami catalogs are reviewed and described in a phenomenological framework. An examination of scaling relationships between earthquake size (as expressed by scalar seismic moment and mean slip) and tsunami size (as expressed by mean and maximum local run-up and maximum far-field amplitude) indicates that scaling is significant...
Using stable isotopes to test for trophic niche partitioning: a case study with stream salamanders and fish
Adam J. Sepulveda, Winsor H. Lowe, Peter P. Marra
2012, Freshwater Biology (57) 1399-1409
1. Stream salamanders and fish often co-occur even though fish prey on and outcompete salamanders. However, the mechanisms that allow palatable salamanders to coexist with fish are unknown. 2. We tested mechanisms in the field that promote coexistence between Idaho giant salamanders (Dicamptodon aterrimus) and stream salmonid fishes in headwater streams. Previous research...
Monitoring subsurface hydrologic response for precipitation-induced shallow landsliding in the San Francisco Bay area, California, USA
Brian D. Collins, Jonathan D. Stock, Lisa C. Weber, K. Whitman, N. Knepprath
2012, Conference Paper, Landslides and engineered slopes: Protecting society through improved understanding, Proceedings of the 11th International Symposium on Landslides
Intense winter storms in the San Francisco Bay area (SFBA) of California, USA often trigger shallow landslides. Some of these landslides mobilize into potentially hazardous debris flows. A growing body of research indicates that rainfall intensity-duration thresholds are insufficient for accurate prediction of landslide occurrence. In response, we have begun...
Automated measurement of diatom size
Sarah A. Spaulding, David H. Jewson, Rebecca J. Bixby, Harry Nelson, Diane M. McKnight
2012, Limnology and Oceanography: Methods (10) 882-890
Size analysis of diatom populations has not been widely considered, but it is a potentially powerful tool for understanding diatom life histories, population dynamics, and phylogenetic relationships. However, measuring cell dimensions on a light microscope is a time-consuming process. An alternative technique has been developed using digital flow cytometry on...
Response by anglers to a differential harvest regulation on three black bass species at Skiatook Lake, Oklahoma
James M. Long, Randy G. Hyler, William L. Fisher
2012, Proceedings of the Oklahoma Academy of Science (92) 9-20
Angler responses to a differential harvest regulation on black bass, Micropterus spp. at Skiatook Lake, Oklahoma was assessed from 1997 to 1999. This regulation allowed anglers to harvest 15 spotted bass, M. punctulatus (Rafinesque) of any size and six largemouth bass, M. salmoides (Lacepède) and smallmouth bass, M. dolomieu Lacepède...
Long-term change along the Colorado River in Grand Canyon National Park (1889-2011)
R. H. Webb, J. Belnap, M. L. Scott, J.M. Friedman, T.C. Esque
2012, Newsletter
The Colorado River and its riverine resources have undergone profound changes since completion of Glen Canyon Dam in 1963, as every river runner with any history in Grand Canyon will attest. Long-term monitoring data are difficult to obtain for high-value resource areas (Webb et al. 2009), particularly in remote parts...
Application of a bioenergetics model for hatchery production: Largemouth bass fed commercial diets
Isak J. Csargo, Michael L. Brown, Steven R. Chipps
2012, North American Journal of Aquaculture (74) 352-359
Fish bioenergetics models based on natural prey items have been widely used to address research and management questions. However, few attempts have been made to evaluate and apply bioenergetics models to hatchery-reared fish receiving commercial feeds that contain substantially higher energy densities than natural prey. In this study, we evaluated...
How to overcome inter-electrode variability and instability to quantify dissolved oxygen, Fe(II), mn(II), and S(−II) in undisturbed soils and sediments using voltammetry
Aaron J. Slowey, Mark Marvin-DiPasquale
2012, Geochemical Transactions (13)
Background - Although uniquely capable of measuring multiple redox constituents nearly simultaneously with no or minimal sample pretreatment, voltammetry is currently underutilized in characterizing redox conditions in aquatic and terrestrial systems. Investigation of undisturbed media such as pore water requires a solid-state electrode, and such electrodes can be difficult to fabricate...
Using the internet to understand angler behavior in the information age
Dustin R. Martin, Brenda M. Pracheil, Jason A. DeBoer, Gene R. Wilde, Kevin L. Pope
2012, Fisheries (37) 458-463
Declining participation in recreational angling is of great concern to fishery managers because fishing license sales are an important revenue source for protection of aquatic resources. This decline is frequently attributed, in part, to increased societal reliance on electronics. Internet use by anglers is increasing and fishery managers may use...
Estimating and predicting collection probability of fish at dams using multistate modeling
John M. Plumb, William P. Connor, Kenneth F. Tiffan, Christine M. Moffitt, Russell W. Perry, Noah S. Adams
2012, Transactions of the American Fisheries Society (141) 1364-1373
Dams can be equipped with a bypass that routes a portion of the fish that enter the turbine intakes away from the powerhouse into flumes, where they can be counted. Daily passage abundance can be estimated by dividing the number of fish counted in the bypass by the sampling rate and then...
