Biodegradability of dissolved organic carbon in the Yukon River and its tributaries: Seasonality and importance of inorganic nitrogen
Kimberly P. Wickland, George R. Aiken, Kenna D. Butler, Mark M. Dornblaser, RGM Spencer, Robert G. Striegl
2012, Global Biogeochemical Cycles (26) 1-14
Northern high-latitude rivers transport large amounts of terrestrially derived dissolved organic matter (DOM) from boreal and arctic ecosystems to coastal areas and oceans. Current knowledge of the biodegradability of DOM in these rivers is limited, particularly for large rivers discharging to the Arctic Ocean. We conducted a seasonally comprehensive study...
Digenean metacercariae of fishes from the lagoon flats of Palmyra Atoll, Eastern Indo-Pacific
V. M. Vidal-Martínez, M. L. Aguirre-Macedo, J.P. McLaughlin, R. F. Hechinger, A.G. Jaramillo, J.C. Shaw, A.K. James, A. M. Kuris, Kevin D. Lafferty
2012, Journal of Helminthology (86) 493-509
Although many studies on the taxonomy of digenean trematodes of marine fishes have been completed in the Eastern Indo-Pacific (EIP) marine ecoregion, only a few have considered metacercarial stages. Here, the results are presented of a taxonomic survey of the digenean metacercariae of fishes from Palmyra Atoll, a remote and...
Ungulate management in national parks of the United States and Canada
S. Demarais, L. Cornicelli, R. Kahn, E. Merrill, C. Miller, J.M. Peek, W.F. Porter, G.A. Sargeant
2012, The Wildlife Society Technical Review (12-05)
Enabling legislation—that which gives appropriate officials the authority to implement or enforce the law—impacts management of ungulates in national parks of Canada and the United States (U.S.). The initial focus of such legislation in both countries centered on preserving natural and culturally significant areas for posterity. Although this objective remains...
Assessment of boreal forest historical C dynamics in the Yukon River Basin: relative roles of warming and fire regime change
F.M. Yuan, S.H. Yi, A. D. McGuire, K.D. Johnson, J. Liang, J.W. Harden, E.S. Kasischke, W.A. Kurz
2012, Ecological Applications (22) 2091-2109
Carbon (C) dynamics of boreal forest ecosystems have substantial implications for efforts to mitigate the rise of atmospheric CO2 and may be substantially influenced by warming and changing wildfire regimes. In this study we applied a large-scale ecosystem model that included dynamics of organic soil horizons and soil organic matter...
Sixty thousand years of magmatic volatile history before the caldera-forming eruption of Mount Mazama, Crater Lake, Oregon
Heather M. Wright, Charles R. Bacon, Jorge A. Vazquez, Thomas W. Sisson
2012, Contributions to Mineralogy and Petrology (164) 1027-1052
The well-documented eruptive history of Mount Mazama, Oregon, provides an excellent opportunity to use pre-eruptive volatile concentrations to study the growth of an explosive silicic magmatic system. Melt inclusions (MI) hosted in pyroxene and plagioclase crystals from eight dacitic–rhyodacitic eruptive deposits (71–7.7 ka) were analyzed to determine variations in volatile-element...
Record length, mass, and clutch size in the nonindigenous Burmese Python, Python bivittatus Kuhl 1820 (Squamata: Pythonidae), in Florida
Kenneth L. Krysko, Kristen M. Hart, Brian J. Smith, Thomas H. Selby, Michael S. Cherkiss, Nicholas T. Coutu, Rebecca M. Reichart, Leroy P. Nuñez, Frank J. Mazzotti, Ray W. Snow
2012, Reptiles & Amphibians (19) 267-270
The Burmese Python, Python bivittatus Kuhl 1820 (Squamata: Pythonidae), is indigenous to northern India,east to southern China, and south to Vietnam and a few islands in Indonesia (Barker and Barker 2008, Reed and Rodda 2009). This species has been introduced since at least 1979 in southern Florida, USA, where it...
Identifying potential habitat for the endangered Aleutian shield fern using topographical characteristics
Adam Duarte, Daniel M. Wolcott, T. Edwin Ricca Chow Ricca, Mark A.
2012, Journal of Fish and Wildlife Management (3) 303-310
The Aleutian shield fern Polystichum aleuticum is endemic to the Aleutian archipelago of Alaska and is listed as endangered pursuant to the U.S. Endangered Species Act. Despite numerous efforts to discover new populations of this species, only four known populations are documented to date, and information is needed to prioritize...
Evaluation of stream flow effects on smolt survival in the Yakima River basin, Washington
Courter Ian, Garrison Tommy, Tobias J. Kock, Russell W. Perry
2012, Report
Study Summary The influence of stream flow on salmon smolt emigration survival is a topic of widespread management interest. We collected smolt survival data to inform flow management decisions in the Yakima Basin. The Yakima River watershed drains the eastern slopes of the Cascade Mountain Range in central Washington State. The...
Assessing future risks to agricultural productivity, water resources and food security: How can remote sensing help?
Prasad S. Thenkabail, Jerry W. Knox, Mutlu Ozdogan, Murali Krishna Gumma, Russell G. Congalton, Zhuoting Wu, Cristina Milesi, Alex Finkral, Mike Marshall, Isabella Mariotto, Songcai You, Chandra Giri, Pamela Nagler
2012, Photogrammetric Engineering and Remote Sensing (78) 773-782
Although global food production has been rising, the world sti ll faces a major food security challenge. Over one billion people are currently undernourished (Wheeler and Kay, 2010). By the 2050s, the human population is projected to grow to 9.1 billion. Over three-quarters of these people will be living in...
Madrean Archipelago Ecoregion: Chapter 28 in Status and trends of land change in the Western United States--1973 to 2000
Jana Ruhlman, Leila Gass, Barry Middleton
2012, Professional Paper 1794-A-28
The Madrean Archipelago Ecoregion (Omernik, 1987; U.S. Environmental Protection Agency, 1997), also known as the “Madrean Sky Islands” or “Sky Islands,” covers an area of approximately 40,536 km2 (15,651 mi2) in southeastern Arizona and southwestern New Mexico (fig. 1). The ecoregion is bounded on the west by the Sonoran Basin...
Mojave Basin and Range Ecoregion: Chapter 29 in Status and trends of land change in the Western United States--1973 to 2000
Benjamin M. Sleeter, Christian G. Raumann
2012, Professional Paper 1794-A-29
This chapter has been modified from original material published in Sleeter and Raumann (2006), entitled “Land-cover trends in the Mojave Basin and Range Ecoregion” (U.S. Geological Survey Scientific Investigations Report 2006–5098). The Mojave Basin and Range Ecoregion (Omernik, 1987; U.S. Environmental Protection Agency, 1997) covers approximately 130,922 km2 (50,549 mi2)...
Sonoran Basin and Range Ecoregion: Chapter 30 in Status and trends of land change in the Western United States--1973 to 2000
James P. Calzia, Tamara S. Wilson
2012, Professional Paper 1794-A-30
The Sonoran Basin and Range Ecoregion covers approximately 116,364 km2 (44,928 mi2) of desert landscape in southeastern California and southwestern Arizona (fig. 1) (Omernik, 1987; U.S. Environmental Protection Agency, 1997). This ecoregion is bounded on the west by the Southern and Central California Chaparral and Oak Woodlands and the Southern...
Individual condition and stream temperature influence early maturation of rainbow and steelhead trout, ncorhynchus mykiss
John R. McMillan, Jason B. Dunham, Gordon H. Reeves, Justin S. Mills, Chris E. Jordan
2012, Environmental Biology of Fishes (93) 343-355
Alternative male phenotypes in salmonine fishes arise from individuals that mature as larger and older anadromous marine-migrants or as smaller and younger freshwater residents. To better understand the processes influencing the expression of these phenotypes we examined the influences of growth in length (fork length) and whole body lipid content...
Colorado Plateaus Ecoregion: Chapter 21 in Status and trends of land change in the Western United States--1973 to 2000
Michael P. Stier
2012, Professional Paper 1794-A-21
The Colorado Plateaus Ecoregion covers approximately 129,617 km2 (50,045 mi2) within southern and eastern Utah, western Colorado, and the extreme northern part of Arizona (fig. 1). The terrain of this ecoregion is characterized by broad plateaus, ancient volcanoes, and deeply dissected canyons (Booth and others, 1999; fig. 2). The ecoregion...
Central Basin and Range Ecoregion: Chapter 20 in Status and trends of land change in the Western United States--1973 to 2000
Christopher E. Soulard
2012, Professional Paper 1794-A-20
This chapter has been modified from original material published in Soulard (2006), entitled “Land-cover trends of the Central Basin and Range Ecoregion” (U.S. Geological Survey Scientific Investigations Report 2006–5288). The Central Basin and Range Ecoregion (Omernik, 1987; U.S. Environmental Protection Agency, 1997) encompasses approximately 343,169 km² (132,498 mi2) of land...
Southern and Central California Chaparral and Oak Woodlands Ecoregion: Chapter 19 in Status and trends of land change in the Western United States--1973 to 2000
Darrell E. Napton
2012, Professional Paper 1794-A-19
The Southern and Central California Chaparral and Oak Woodlands Ecoregion, which covers approximately 102,110 km2 (39,425 mi2), is characterized by a Mediterranean climate with cool, moist winters and hot, dry summers (Omernik, 1987; U.S. Environmental Protection Agency, 1997). Natural vegetation includes chaparral (for example, manzanita, Arctostaphylos spp.) and oak (Quercus...
Southern California Mountains Ecoregion: Chapter 18 in Status and trends of land change in the Western United States--1973 to 2000
Christopher E. Soulard, Christian G. Raumann, Tamara S. Wilson
2012, Professional Paper 1794-A-18
This chapter has been modified from original material published in Soulard and others (2007), entitled “Land-cover trends of the Southern California Mountains ecoregion” (U.S. Geological Survey Scientific Investigations Report 2007–5235). The Southern California Mountains Ecoregion (Omernik, 1987; U.S. Environmental Protection Agency, 1997) encompasses approximately 17,871 km² (6,900 mi²) of land...
Central California Valley Ecoregion: Chapter 17 in Status and trends of land change in the Western United States--1973 to 2000
Benjamin M. Sleeter
2012, Professional Paper 1794-A-17
The Central California Valley Ecoregion, which covers approximately 45,983 km2 (17,754 mi2), is an elongated basin extending approximately 650 km north to south through central California (fig. 1) (Omernik, 1987; U.S. Environmental Protection Agency, 1997). The ecoregion is surrounded entirely by the Southern and Central California Chaparral and Oak Woodlands...
Blue Mountains Ecoregion: Chapter 16 in Status and trends of land change in the Western United States--1973 to 2000
Christopher E. Soulard
2012, Professional Paper 1794-A-16
The Blue Mountains Ecoregion encompasses approximately 65,461 km² (25,275 mi²) of land bordered on the north by the Columbia Plateau Ecoregion, on the east by the Northern Rockies Ecoregion, on the south by the Snake River Basin and the Northern Basin and Range Ecoregions, and on the west by the...
Sierra Nevada Ecoregion: Chapter 15 in Status and trends of land change in the Western United States--1973 to 2000
Christian G. Raumann, Christopher E. Soulard
2012, Professional Paper 1794-A-15
This chapter has been modified from original material published in Raumann and Soulard (2007), entitled “Land-cover trends of the Sierra Nevada Ecoregion, 1973–2000” (U.S. Geological Survey Scientific Investigations Report 2007–5011). The Sierra Nevada Ecoregion covers approximately 53,413 km² (20,623 mi²) with the majority of the area (98 percent) in California...
North Cascades Ecoregion: Chapter 14 in Status and trends of land change in the Western United States--1973 to 2000
Tamara S. Wilson
2012, Professional Paper 1794-A-14
The North Cascades Ecoregion (Omernik, 1987; U.S. Environmental Protection Agency, 1997) covers approximately 30,421 km2 (11,746 mi2) of predominantly steep, mountainous terrain, home to peaks rising more than 3,000 m, which are carved by valleys that drop below 150 m elevation (fig. 1). The unique topography in this geographically isolated...
Klamath Mountains Ecoregion: Chapter 13 in Status and trends of land change in the Western United States--1973 to 2000
Benjamin M. Sleeter, James P. Calzia
2012, Professional Paper 1794-A-13
The Klamath Mountains Ecoregion covers approximately 47,791 km2 (18,452 mi2) of the Klamath and Siskiyou Mountains of northern California and southern Oregon (fig. 1) (Omernik, 1987; U.S. Environmental Protection Agency, 1997). The ecoregion is flanked by the Coast Range Ecoregion to the west, the Southern and Central California Chaparral and...
Scriptaid and 5-aza-2'deoxycytidine enhanced expression of pluripotent genes and in vitro developmental competence in interspecies Black-footed cat cloned embryos
M. C. Gomez, M.N. Biancardi, J.A. Jenkins, C. Dumas, J. Galiguis, G. Wang, C. Earle Pope
2012, Reproduction in Domestic Animals (47) 130-135
Somatic cell nuclear transfer offers the possibility of preserving endangered species including the black-footed cat, which is threatened with extinction. The effectiveness and efficiency of somatic cell nuclear transfer (SCNT) depends on a variety of factors, but 'inappropriate epigenetic reprogramming of the transplanted nucleus is the primary cause of the...
Eastern Cascades Slopes and Foothills Ecoregion: Chapter 12 in Status and trends of land change in the Western United States--1973 to 2000
Daniel G. Sorenson
2012, Professional Paper 1794-A-12
The Eastern Cascades Slopes and Foothills Ecoregion (Omernik, 1987; U.S. Environmental Protection Agency, 1997) covers approximately 57,329 km² (22,135 mi²) in the states of Washington, Oregon, and California (fig. 1). The ecoregion is bounded on the east by the Columbia Plateau, Blue Mountains, and Northern Basin and Range Ecoregions; on...
Interactions between methylmercury and selenomethionine injected into mallard eggs
J.D. Klimstra, J.L. Yee, G. H. Heinz, D. J. Hoffman, K.R. Stebbins
2012, Environmental Toxicology and Chemistry (31) 579-584
Methylmercury chloride and seleno-L-methionine were injected separately or in combinations into mallard eggs (Anas platyrhynchos), and embryo mortality and teratogenic effects (deformities) were modeled using a logistic regression model. Methylmercury was injected at doses that resulted in concentrations of 0, 0.2, 0.4, 0.8, and 1.6 µg/g Hg in the...
