Analysis of the sea otter (Enhydra lutris) reproductive tract: A methods manual
Vanessa R. von Biela, Verena A. Gill
2007, Technical Report MMM 2007-002
Reproduction in the female sea otter, Enhydra lutris, was relatively unstudied until Sinha et al. (1966) examined 140 reproductive tracts collected 1955-62 and used their findings to describe sea otter reproductive anatomy and biology. Two years later Sinha and Conaway (1968) published a more detailed paper on the ovary of...
Solar forcing of Gulf of California climate during the past 2000 yr suggested by diatoms and silicoflagellates
John A. Barron, David Bukry
2007, Marine Micropaleontology (62) 115-139
High-resolution records of the past 2000 yr are compared in a north–south transect (28° N to 24° N) of three cores from the eastern slopes of the Guaymas, Carmen, and Pescadero Basins of the Gulf of California (hereafter referred to as the “Gulf”). Evenly-spaced samples from the varved sediments in each...
The application of satellite differential SAR interferometry-derived ground displacements in hydrogeology
D. L. Galloway, J. Hoffmann
2007, Hydrogeology Journal (15) 133-154
The application of satellite differential synthetic aperture radar (SAR) interferometry, principally coherent (InSAR) and to a lesser extent, persistent-scatterer (PSI) techniques to hydrogeologic studies has improved capabilities to map, monitor, analyze, and simulate groundwater flow, aquifer-system compaction and land subsidence. A number of investigations over the previous decade show how...
Reproductive biology of the violet-chested hummingbird in Venezuela and comparisons with other tropical and temperate hummingbirds
Karolina Fierro-Calderon, T. E. Martin
2007, Condor (109) 680-685
We provide details on the breeding biology of the Violet-chested Hummingbird (Sternoclyta cyanopectus) based on 67 nests studied in Yacambu?? National Park, Venezuela, from 2002 through 2006. Clutch size was two white eggs, usually laid every other day. Fresh egg mass (0.95 ?? 0.14 g) was 15% of female mass....
Olivine friction at the base of oceanic seismogenic zones
M.S. Boettcher, G. Hirth, B. M. Evans
2007, Journal of Geophysical Research B: Solid Earth (112)
We investigate the strength and frictional behavior of olivine aggregates at temperatures and effective confining pressures similar to those at the base of the seismogenic zone on a typical ridge transform fault. Triaxial compression tests were conducted on dry olivine powder (grain size ???60 ??m) at effective confining pressures between...
Ovarian follicle dynamics of female Greater Scaup during egg production
Kristen B. Gorman, Paul L. Flint, Daniel Esler, T.D. Williams
2007, Journal of Field Ornithology (78) 64-73
Studies of female waterfowl nutrient reserve use during egg production require a precise understanding of ovarian follicle dynamics to correctly interpret breeding status, and, therefore, derive proper inference. Concerns over numerical declines of North American scaup have increased the need to better understand the role of female condition in reproductive...
Exploring the temporal effects of seasonal water availability on the snail kite of Florida: Part III
Wolf M. Mooij, Julien Martin, Wiley M. Kitchens, Donald L. DeAngelis
2007, Book chapter, Temporal dimensions of landscape ecology: Wildlife responses to variable resources
The Florida snail kite (Rostrhamus sociabilis) is an endangered raptor that occurs as an isolated population, currently of about 2,000 birds, in the wetlands of southern and central Florida, USA. Its exclusive prey species, the apple snail (Pomacea paludosa) is strongly influenced by seasonal changes in...
Global impacts of conversions from natural to agricultural ecosystems on water resources: Quantity versus quality
Bridget R. Scanlon, Ian Jolly, Marios Sophocleous, Lu Zhang
2007, Water Resources Research (43)
Past land use changes have greatly impacted global water resources, with often opposing effects on water quantity and quality. Increases in rain‐fed cropland (460%) and pastureland (560%) during the past 300 years from forest and grasslands decreased evapotranspiration and increased recharge (two orders of magnitude) and streamflow (one order of...
Assessing exotic plant species invasions and associated soil characteristics: A case study in eastern Rocky Mountain National Park, Colorado, USA, using the pixel nested plot design
M. A. Kalkhan, E.J. Stafford, P.J. Woodly, T.J. Stohlgren
2007, Applied Soil Ecology (35) 622-634
Rocky Mountain National Park (RMNP), Colorado, USA, contains a diversity of plant species. However, many exotic plant species have become established, potentially impacting the structure and function of native plant communities. Our goal was to quantify patterns of exotic plant species in relation to native plant species, soil characteristics, and...
Does avian species richness in natural patch mosaics follow the forest fragmentation paradigm?
D.C. Pavlacky Jr., S.H. Anderson
2007, Animal Conservation (10) 57-68
As one approaches the north-eastern limit of pinyon (Pinus spp.) juniper (Juniperus spp.) vegetation on the Colorado Plateau, USA, woodland patches become increasingly disjunct, grading into sagebrush (Artemisia spp.)-dominated landscapes. Patterns of avian species richness in naturally heterogeneous forests may or may not respond to patch discontinuity in the same...
The impact of floods and storms on the acoustic reflectivity of the inner continental shelf: A modeling assessment
Lincoln F. Pratson, E. W. H. Hutton, A.J. Kettner, J.P.M. Syvitski, P.S. Hill, D.A. George, T.G. Milligan
2007, Continental Shelf Research (27) 542-559
Flood deposition and storm reworking of sediments on the inner shelf can change the mixture of grain sizes on the seabed and thus its porosity, bulk density, bulk compressional velocity and reflectivity. Whether these changes are significant enough to be detectable by...
SHRIMP U-Pb evidence for a Late Silurian age of metasedimentary rocks in the Merrimack and Putnam-Nashoba terranes, eastern New England
R. P. Wintsch, J. N. Aleinikoff, G. J. Walsh, Wallace A. Bothner, A. M. Hussey, C.M. Fanning
2007, American Journal of Science (307) 119-167
U-Pb ages of detrital, metamorphic, and magmatic zircon and metamorphic monazite and titanite provide evidence for the ages of deposition and metamorphism of metasedimentary rocks from the Merrimack and Putnam-Nashoba terranes of eastern New England. Rocks from these terranes are interpreted here as having been deposited in the middle Paleozoic...
Response of western mountain ecosystems to climatic variability and change: The Western Mountain Initiative
Nathan L. Stephenson, Dave Peterson, Daniel B. Fagre, Craig D. Allen, Donald McKenzie, Jill Baron, Kelly O’Brian
2007, Mountain Views (1) 4-9
Mountain ecosystems within our national parks and other protected areas provide valuable goods and services such as clean water, biodiversity conservation, and recreational opportunities, but their potential responses to expected climatic changes are inadequately understood. The Western Mountain Initiative (WMI) is a collaboration of scientists whose research focuses on understanding...
Estimating biomass of submersed vegetation using a simple rake sampling technique
K.P. Kenow, J.E. Lyon, R. K. Hines, A. Elfessi
2007, Hydrobiologia (575) 447-454
We evaluated the use of a simple rake sampling technique for predicting the biomass of submersed aquatic vegetation. Vegetation sampled from impounded areas of the Mississippi River using a rake sampling technique, was compared with vegetation harvested from 0.33-m2 quadrats. The resulting data were used to model the relationship between...
Hazards from hydrothermally sealed volcanic conduits
B.W. Christenson, Cynthia A. Werner, A.G. Reyes, S. Sherburn, B.J. Scott, C. Miller, M.J. Rosenburg, A.W. Hurst, K.A. Britten
2007, Eos, Transactions, American Geophysical Union (88) 53-55
The 17 March 2006 eruption from Raoul Island (Kermadec arc, north of New Zealand) is interpreted as a magmatic‐hydrothermal event triggered by shaking associated with a swarm of local earthquakes. The eruption, which tragically claimed the life of New Zealand Department of Conservation Ranger Mark Kearney, occurred...
Shorebird roost-site selection at two temporal scales: Is human disturbance a factor?
K. A. Peters, David L. Otis
2007, Journal of Applied Ecology (44) 196-209
1. Roost-site selection in shorebirds is governed by ambient factors, including environmental conditions and human disturbance. Determination of the extent to which these factors affect roost use and the associated implications for shorebird habitat protection is important for conservation strategies and informed management of human recreational use of these habitats....
Silurian extension in the Upper Connecticut Valley, United States and the origin of middle Paleozoic basins in the Québec embayment
D.W. Rankin, R.A. Coish, R. D. Tucker, Z.X. Peng, S. A. Wilson, A.A. Rouff
2007, American Journal of Science (307) 216-264
Pre-Silurian strata of the Bronson Hill arch (BHA) in the Upper Connecticut Valley, NH-VT are host to the latest Ludlow Comerford Intrusive Suite consisting, east to west, of a mafic dike swarm with sheeted dikes, and an intrusive complex. The rocks are mostly mafic but with compositions ranging from gabbro...
Preface to the Madison declaration and critical synthesis papers on mercury pollution
James P. Hurley, David P. Krabbenhoft, James G. Wiener, Christopher L. Babiarz
2007, Ambio (36) 2-2
No abstract available....
Sequence analysis of the msp4 gene of Anaplasma ovis strains
J. de la Fuente, M.W. Atkinson, V. Naranjo, I. G. Fernandez de Mera, A.J. Mangold, K.A. Keating, K. M. Kocan
2007, Veterinary Microbiology (119) 375-381
Anaplasma ovis (Rickettsiales: Anaplasmataceae) is a tick-borne pathogen of sheep, goats and wild ruminants. The genetic diversity of A. ovis strains has not been well characterized due to the lack of sequence information. In this study, we evaluated bighorn sheep (Ovis canadensis) and mule deer (Odocoileus hemionus) from Montana for...
Diversity of terrestrial avifauna in response to distance from the shoreline of the Salton Sea
M.B. Mendelsohn, W.I. Boarman, Robert N. Fisher, S.A. Hathaway
2007, Journal of Arid Environments (68) 574-587
Large aquatic bodies influence surrounding terrestrial ecosystems by providing water and nutrients. In arid landscapes, the increased primary productivity that results may greatly enhance vertebrate biodiversity. The Salton Sea, a large saline lake in the Colorado Desert of southern California, provides nutrients...
Net emissions of CH4 and CO2 in Alaska: Implications for the region's greenhouse gas budget
Q. Zhuang, J. M. Melillo, A. D. McGuire, D. W. Kicklighter, R.G. Prinn, P.A. Steudler, B.S. Felzer, S. Hu
2007, Ecological Applications (17) 203-212
We used a biogeochemistry model, the Terrestrial Ecosystem Model (TEM), to study the net methane (CH4) fluxes between Alaskan ecosystems and the atmosphere. We estimated that the current net emissions of CH4 (emissions minus consumption) from Alaskan soils are ???3 Tg CH 4/yr. Wet tundra ecosystems are responsible for 75%...
Pressure calibrants in the hydrothermal diamond-anvil cell
I.-M. Chou
2007, International Geology Review (49) 289-300
Based on the equation of state of water (EOSW), experimental pressure in the hydrothermal diamond-anvil cell (HDAC) using pure water or dilute aqueous solutions as a pressure medium can be accurately determined at each measured temperature. Consequently, meaningful interpretations can be obtained for observations in the HDAC, which has been...
Habitat relationships of birds overwintering in a managed coastal prairie
H.Q. Baldwin, J.B. Grace, W.C. Barrow Jr., F.C. Rohwer
2007, Wilson Journal of Ornithology (119) 189-197
Grassland birds are considered to be rapidly declining in North America. Management approaches for grassland birds frequently rely on prescribed burning to maintain habitat in suitable condition. We evaluated the relationships among years since burn, vegetation structure, and overwintering grassland bird abundance in coastal prairie. Le Conte's Sparrows (Ammodramus leconteii)...
Regional magnetic anomalies, crustal strength, and the location of the northern Cordilleran fold-and-thrust belt
R. W. Saltus, T. L. Hudson
2007, Geology (35) 567-570
The northern Cordilleran fold-and-thrust belt in Canada and Alaska is at the boundary between the broad continental margin mobile belt and the stable North American craton. The fold-and-thrust belt is marked by several significant changes in geometry: cratonward extensions in the central Yukon Territory and northeastern Alaska are separated by...
Young cumulate complex beneath Veniaminof caldera, Aleutian arc, dated by zircon in erupted plutonic blocks
C. R. Bacon, T.W. Sison, F.K. Mazdab
2007, Geology (35) 491-494
Mount Veniaminof volcano, Alaska Peninsula, provides an opportunity to relate Quaternary volcanic rocks to a coeval intrusive complex. Veniaminof erupted tholeiitic basalt through dacite in the past ∼260 k.y. Gabbro, diorite, and miarolitic granodiorite blocks, ejected 3700 14C yr B.P. in the most recent...
