Mallard harvest distributions in the Mississippi and Central Flyways
A.W. Green, D.G. Krementz
2008, Journal of Wildlife Management (72) 1328-1334
The mallard (Anas platyrhynchos) is the most harvested duck in North America. A topic of debate among hunters, especially those in Arkansas, USA, is whether wintering distributions of mallards have changed in recent years. We examined distributions of mallards in the Mississippi (MF) and Central Flyways during hunting seasons 1980-2003...
Calibrating and testing a gap model for simulating forest management in the Oregon Coast Range
R.J. Pabst, M.N. Goslin, S.L. Garman, T.A. Spies
2008, Forest Ecology and Management (256) 958-972
The complex mix of economic and ecological objectives facing today's forest managers necessitates the development of growth models with a capacity for simulating a wide range of forest conditions while producing outputs useful for economic analyses. We calibrated the gap model ZELIG to simulate stand-level forest development in the Oregon...
Warming of the Indian Ocean threatens eastern and southern African food security but could be mitigated by agricultural development
Chris C. Funk, Michael D. Dettinger, Joel C. Michaelsen, James P. Verdin, Molly E. Brown, Mathew Barlow, Andrew Hoell
2008, Proceedings of the National Academy of Sciences of the United States of America (105) 11081-11086
Since 1980, the number of undernourished people in eastern and southern Africa has more than doubled. Rural development stalled and rural poverty expanded during the 1990s. Population growth remains very high, and declining per-capita agricultural capacity retards progress toward Millennium Development goals. Analyses of in situ station data and satellite...
Complex faulting associated with the 22 December 2003 Mw 6.5 San Simeon California, earthquake, aftershocks and postseismic surface deformation
Marcia K. McLaren, Jeanne L. Hardebeck, Nicholas van der Elst, Jeffrey R. Unruh, Gerald W. Bawden, J. Luke Blair
2008, Bulletin of the Seismological Society of America (98) 1659-1680
We use data from two seismic networks and satellite interferometric synthetic aperture radar (InSAR) imagery to characterize the 22 December 2003 Mw 6.5 San Simeon earthquake sequence. Absolute locations for the mainshock and nearly 10,000 aftershocks were determined using a new three-dimensional (3D) seismic velocity model; relative locations were obtained using...
The decline of winter monsoon velocity in the South China Sea through the 20th century: Evidence from the Sr/Ca records in corals
Yajing Liu, Z. Peng, T. Chen, G. Wei, W. Sun, R. Sun, J. He, Gaisheng Liu, C. L. Chou, R. E. Zartman
2008, Global and Planetary Change (63) 79-85
A modern massive Porites coral was collected from the Longwan Bay (19??20???N, 110??39???E) on the east coast of the Hainan Island, China. The coral was sectioned vertical to the growth axis into discs of double density-bands representing annual growth. The samples were analyzed for the Sr/Ca ratio by inductively coupled...
Mapping regional distribution of a single tree species: Whitebark pine in the Greater Yellowstone Ecosystem
L. Landenburger, R.L. Lawrence, S. Podruzny, C.C. Schwartz
2008, Sensors (8) 4983-4994
Moderate resolution satellite imagery traditionally has been thought to be inadequate for mapping vegetation at the species level. This has made comprehensive mapping of regional distributions of sensitive species, such as whitebark pine, either impractical or extremely time consuming. We sought to determine whether using a combination of moderate resolution...
Landscape complexity and soil moisture variation in south Georgia, USA, for remote sensing applications
M.A. Giraldo, D. Bosch, M. Madden, L. Usery, Craig Kvien
2008, Journal of Hydrology (357) 405-420
This research addressed the temporal and spatial variation of soil moisture (SM) in a heterogeneous landscape. The research objective was to investigate soil moisture variation in eight homogeneous 30 by 30 m plots, similar to the pixel size of a Landsat Thematic Mapper (TM) or Enhanced Thematic Mapper plus (ETM+)...
Spatial patterns and movements of red king and Tanner crabs: Implications for the design of marine protected areas
S. James Taggart, Jennifer Mondragon, A.G. Andrews, J.K. Nielsen
2008, Marine Ecology Progress Series (365) 151-163
Most examples of positive population responses to marine protected areas (MPAs) have been documented for tropical reef species with very small home ranges; the utility of MPAs for commercially harvested temperate species that have large movement patterns remains poorly tested. We measured the distribution and abundance of red king Paralithodes...
Spatial dynamics of overbank sedimentation in floodplain systems
Aaron R. Pierce, S.L. King
2008, Geomorphology (100) 256-268
Floodplains provide valuable social and ecological functions, and understanding the rates and patterns of overbank sedimentation is critical for river basin management and rehabilitation. Channelization of alluvial systems throughout the world has altered hydrological and sedimentation processes within floodplain ecosystems. In the loess belt region of the Lower Mississippi Alluvial...
Allowing macroalgae growth forms to emerge: Use of an agent-based model to understand the growth and spread of macroalgae in Florida coral reefs, with emphasis on Halimeda tuna
A.T. Yniguez, J.W. McManus, D.L. DeAngelis
2008, Ecological Modelling (216) 60-74
The growth patterns of macroalgae in three-dimensional space can provide important information regarding the environments in which they live, and insights into changes that may occur when those environments change due to anthropogenic and/or natural causes. To decipher these patterns and their attendant mechanisms and influencing factors, a spatially explicit...
Hydrologic models of modern and fossil geothermal systems in the Great Basin: Genetic implications for epithermal Au-Ag and Carlin-type gold deposits
M. Person, A. Banerjee, A. Hofstra, D. Sweetkind, Y. Gao
2008, Geosphere (4) 888-917
The Great Basin region in the western United States contains active geothermal systems, large epithermal Au-Ag deposits, and world-class Carlin-type gold deposits. Temperature profiles, fluid inclusion studies, and isotopic evidence suggest that modern and fossil hydrothermal systems associated with gold mineralization share many common features, including the absence of a...
Evidence for an eolian origin for the silt-enriched soil mantles on the glaciated uplands of eastern Upper Michigan, USA
R.J. Schaetzl, W.L. Loope
2008, Geomorphology (100) 285-295
We provide textural, geochemical, and mineralogical data on a thin, silty deposit that unconformably mantles glaciated uplands in the eastern Upper Peninsula of Michigan. Previous research on this deposit, which we hypothesize to be loess, is nonexistent. The uplands were islands or narrow peninsulas within one or more glacial lakes....
Evidence for an apical Na-Cl cotransporter involved in ion uptake in a teleost fish
J. Hiroi, S. Yasumasu, S. D. McCormick, P.-P. Hwang, T. Kaneko
2008, Journal of Experimental Biology (211) 2584-2599
Cation-chloride cotransporters, such as the Na+/K +/2Cl- cotransporter (NKCC) and Na+/Cl - cotransporter (NCC), are localized to the apical or basolateral plasma membranes of epithelial cells and are involved in active ion absorption or secretion. The objectives of this study were to clone and identify 'freshwater-type' and 'seawater-type' cation-chloride cotransporters...
An introduced and a native vertebrate hybridize to form a genetic bridge to a second native species
D.B. McDonald, T.L. Parchman, M.R. Bower, W.A. Hubert, F.J. Rahel
2008, Proceedings of the National Academy of Sciences of the United States of America (105) 10837-10842
The genetic impacts of hybridization between native and introduced species are of considerable conservation concern, while the possibility of reticulate evolution affects our basic understanding of how species arise and shapes how we use genetic data to understand evolutionary diversification. By using mitochondrial NADH dehydrogenase subunit 2 (ND2) sequences and...
Biomedical and veterinary science can increase our understanding of coral disease
Thierry M. Work, Laurie L. Richardson, T. L. Reynolds, Bette L. Willis
2008, Journal of Experimental Marine Biology and Ecology (362) 63-70
A balanced approach to coral disease investigation is critical for understanding the global decline of corals. Such an approach should involve the proper use of biomedical concepts, tools, and terminology to address confusion and promote clarity in the coral disease literature. Investigating disease in corals should follow a logical series...
Agreement evaluation of AVHRR and MODIS 16-day composite NDVI data sets
Lei Ji, Kevin P. Gallo, Jeffery C. Eidenshink, John L. Dwyer
2008, International Journal of Remote Sensing (29) 4839-4861
Satellite-derived normalized difference vegetation index (NDVI) data have been used extensively to detect and monitor vegetation conditions at regional and global levels. A combination of NDVI data sets derived from AVHRR and MODIS can be used to construct a long NDVI time series that may also be extended to VIIRS....
Modelling invasion for a habitat generalist and a specialist plant species
P.H. Evangelista, S. Kumar, T.J. Stohlgren, C. S. Jarnevich, A.W. Crall, J. B. Norman III, D.T. Barnett
2008, Diversity and Distributions (14) 808-817
Predicting suitable habitat and the potential distribution of invasive species is a high priority for resource managers and systems ecologists. Most models are designed to identify habitat characteristics that define the ecological niche of a species with little consideration to individual species' traits. We tested five commonly used modelling methods...
Temporal change in fragmentation of continental US forests
James D. Wickham, K.H. Riitters, Timothy G. Wade, Collin G. Homer
2008, Landscape Ecology (23) 891-898
Changes in forest ecosystem function and condition arise from changes in forest fragmentation. Previous studies estimated forest fragmentation for the continental United States (US). In this study, new temporal land-cover data from the National Land Cover Database (NLCD) were used to estimate changes in forest fragmentation at multiple scales for...
Two-phase Neogene extension in the northwestern basin and range recorded in a single thermochronology sample
J.P. Colgan, D.L. Shuster, P.W. Reiners
2008, Geology (36) 631-634
We use a combination of apatite 4He/3He, (U-Th)/ He, and fission-track thermochronology to date slip on the Surprise Valley fault in northeastern California by analyzing a single sample from the Warner Range in the footwall of the fault. This sample, a granitic clast from a conglomerate, yielded a fission-track age...
Stormwater plume detection by MODIS imagery in the southern California coastal ocean
N.P. Nezlin, P.M. DiGiacomo, D.W. Diehl, B.H. Jones, S.C. Johnson, M.J. Mengel, K.M. Reifel, J.A. Warrick, M. Wang
2008, Estuarine, Coastal and Shelf Science (80) 141-152
Stormwater plumes in the southern California coastal ocean were detected by MODIS-Aqua satellite imagery and compared to ship-based data on surface salinity and fecal indicator bacterial (FIB) counts collected during the Bight'03 Regional Water Quality Program surveys in February-March of 2004 and 2005. MODIS imagery was processed using a combined...
Wave climate, sediment supply and the depth of the sand-mud transition: A global survey
D.A. George, P.S. Hill
2008, Marine Geology (254) 121-128
The influences of wave climate and sediment supply on the depths of sand-mud transitions (hSMT) are investigated. Depths of sand-mud transitions (SMT) are based on published granulometric data from surface samples gathered from 14 sites in different wave-dominated coastal environments with fluvial input, including high energy (Columbia, Eel, Russian, San...
Trade-offs of predation and foraging explain sexual segregation in African buffalo
C.T. Hay, P.C. Cross, P.J. Funston
2008, Journal of Animal Ecology (77) 850-858
1. Many studies have investigated why males and females segregate spatially in sexually dimorphic species. These studies have focused primarily on temperate zone ungulates in areas lacking intact predator communities, and few have directly assessed predation rates in different social environments. 2. Data on the movement, social affiliation, mortality and...
Calculating wave-generated bottom orbital velocities from surface-wave parameters
P.L. Wiberg, C. R. Sherwood
2008, Computers & Geosciences (34) 1243-1262
Near-bed wave orbital velocities and shear stresses are important parameters in many sediment-transport and hydrodynamic models of the coastal ocean, estuaries, and lakes. Simple methods for estimating bottom orbital velocities from surface-wave statistics such as significant wave height and peak period often are inaccurate except in very shallow water. This...
Combining MODIS and Landsat imagery to estimate and map boreal forest cover loss
P. Potapov, Matthew C. Hansen, S.V. Stehman, Thomas R. Loveland, K. Pittman
2008, Remote Sensing of Environment (112) 3708-3719
Estimation of forest cover change is important for boreal forests, one of the most extensive forested biomes, due to its unique role in global timber stock, carbon sequestration and deposition, and high vulnerability to the effects of global climate change. We used time-series data from the MODerate Resolution Imaging Spectroradiometer...
Geolocation of man-made reservoirs across terrains of varying complexity using GIS
D.M. Mixon, D.A. Kinner, R.F. Stallard, J.P.M. Syvitski
2008, Computers & Geosciences (34) 1184-1197
The Reservoir Sedimentation Survey Information System (RESIS) is one of the world's most comprehensive databases of reservoir sedimentation rates, comprising nearly 6000 surveys for 1819 reservoirs across the continental United States. Sediment surveys in the database date from 1904 to 1999, though more than 95% of surveys were entered prior...
