Moult migration of emperor geese Chen canagica between Alaska and Russia
Jerry W. Hupp, Joel A. Schmutz, Craig R. Ely, E.E. Syroechkovskiy Jr., Alexander V. Kondratyev, W.D. Eldridge, E. Lappo
2007, Journal of Avian Biology (38) 462-470
We studied reproductive success and post-breeding movements of 32 adult female emperor geese Chen canagica that were marked with satellite radio transmitters on their nesting area on the Yukon-Kuskokwim Delta (YKD), Alaska 2000–2004. All 16 females that failed to successfully reproduce departed the YKD and moulted remiges either on the north coast...
The Alaska Resource Data File
D. J. Grybeck, Frederic H. Wilson, D P. Bickerstaff
2007, The Alaska Miner (35) 6-17
No abstract available....
Seabirds as indicators of marine ecosystems: Introduction: A modern role for seabirds as indicators
John F. Piatt, William J. Sydeman, Francis Wiese
2007, Marine Ecology Progress Series (352) 199-204
A key requirement for implementing ecosystem-based management is to obtain timely information on significant fluctuations in the ecosystem (Botsford et al. 1997). However, obtaining all necessary information about physical and biological changes at appropriate temporal and spatial scales is a daunting task. Intuitively, one might assume that physical data are more...
The stratigraphic utility of the trace fossil Pteridichnites biseriatus in the Upper Devonian of eastern West Virginia and western Virginia, USA
R.R. McDowell, K.L. Avary, D.L. Matchen, J.Q. Britton
2007, Southeastern Geology (44) 191-201
Similar lithologies and lithofacies are present in two Upper Devonian siliciclastic units, the Brallier and Foreknobs formations, in eastern West Virginia and western Virginia, USA. Specimens of an unusual trace fossil, Pteridichnites biseriatus, occur in variable numbers throughout both stratigraphic units. P. biseriatus is present in abundance in the lowermost...
Characterization of post-fire surface cover, soils, and burn severity at the Cerro Grande Fire, New Mexico, using hyperspectral and multispectral remote sensing
R.F. Kokaly, B.W. Rockwell, S.L. Haire, T. V. V. King
2007, Remote Sensing of Environment (106) 305-325
Forest fires leave behind a changed ecosystem with a patchwork of surface cover that includes ash, charred organic matter, soils and soil minerals, and dead, damaged, and living vegetation. The distributions of these materials affect post-fire processes of erosion, nutrient cycling, and vegetation regrowth. We analyzed high spatial resolution (2.4??m...
Interaction and influence of two creeks on Escherichia coli concentrations of nearby beaches: Exploration of predictability and mechanisms
M.B. Nevers, R.L. Whitman, W.E. Frick, Z. Ge
2007, Journal of Environmental Quality (36) 1338-1345
The impact of river outfalls on beach water quality depends on numerous interacting factors. The delivery of contaminants by multiple creeks greatly complicates understanding of the source contributions, especially when pollution might originate up- or down-coast of beaches. We studied two beaches along Lake Michigan that are located between two...
Invasive plants and their ecological strategies: Prediction and explanation of woody plant invasion in New England
P.M. Herron, C.T. Martine, A.M. Latimer, S. A. Leicht-Young
2007, Diversity and Distributions (13) 633-644
Effective management of introduced species requires the early identification of species that pose a significant threat of becoming invasive. To better understand the invasive ecology of species in New England, USA, we compiled a character data set with which to compare non-native species that are known invaders to non-native species...
Survival of breeding Pacific common eiders on the Yukon-Kuskokwim Delta, Alaska
H.M. Wilson, Paul L. Flint, Christine L. Moran, A.N. Powell
2007, Journal of Wildlife Management (71) 403-410
Populations of Pacific common eiders (Somateria mollissima v-nigrum) breeding in Alaska, USA, have declined markedly over the past 40 years. We studied survival of adult female Pacific common eiders using capture—recapture of nesting hens at 3 sites on the Yukon-Kuskokwim Delta (YKD), Alaska from 1994 to 2004. We used data...
Earlier famine warning possible using remote sensing and models
M.E. Brown, C.C. Funk, G. Galu, R. Choularton
2007, Eos, Transactions, American Geophysical Union (88) 381-382
[No abstract available]...
Influence of disturbance on carbon exchange in a permafrost collapse and adjacent burned forest
I. H. Myers-Smith, A. D. McGuire, J.W. Harden, F. S. Chapin III
2007, Journal of Geophysical Research G: Biogeosciences (112)
We measured CO2 and CH4 exchange from the center of a Sphagnum‐dominated permafrost collapse, through an aquatic moat, and into a recently burned black spruce forest on the Tanana River floodplain in interior Alaska. In the anomalously dry growing season of 2004, both the collapse and the surrounding burned area were net sinks...
Cultural diversity, economic development and societal instability
D. Nettle, J.B. Grace, M. Choisy, H.V. Cornell, J.-F. Guegan, M.E. Hochberg
2007, PLoS ONE (2)
Background. Social scientists have suggested that cultural diversity in a nation leads to societal instability. However, societal instability may be affected not only by within-nation on ?? diversity, but also diversity between a nation and its neighbours or ?? diversity. It is also necessary to distinguish different domains of diversity,...
Sandy signs of a tsunami's onshore depth and speed
K. Huntington, J. Bourgeois, G. Gelfenbaum, P. Lynett, B. Jaffe, H. Yeh, R. Weiss
2007, Eos, Transactions, American Geophysical Union (88) 577-578
Tsunamis rank among the most devastating and unpredictable natural hazards to affect coastal areas. Just 3 years ago, in December 2004, the Indian Ocean tsunami caused more than 225,000 deaths. Like many extreme events, however, destructive tsunamis strike rarely enough that written records span too little time to quantify tsunami...
Carbon isotopic compositions of organic matter across continental Cretaceous-Tertiary (K-T) boundary sections: Implications for paleoenvironment after the K-T impact event
T. Maruoka, C. Koeberl, B.F. Bohor
2007, Earth and Planetary Science Letters (253) 226-238
To assess the environmental perturbation induced by the impact event that marks the Cretaceous-Tertiary (K-T) boundary, concentrations and isotopic compositions of bulk organic carbon were determined in sedimentary rocks that span the terrestrial K-T boundary at Dogie Creek, Montana, and Brownie Butte, Wyoming in the Western Interior of the United...
Characterizing dry deposition of mercury in urban runoff
M. Fulkerson, F.N. Nnadi, L.S. Chasar
2007, Water, Air, & Soil Pollution (185) 21-32
Stormwater runoff from urban surfaces often contains elevated levels of toxic metals. When discharged directly into water bodies, these pollutants degrade water quality and impact aquatic life and human health. In this study, the composition of impervious surface runoff and associated rainfall was investigated for several storm events at an...
Nutrient vectors and riparian processing: A review with special reference to African semiarid savanna ecosystems
Shayne M. Jacobs, J.S. Bechtold, Harry C. Biggs, N. B. Grimm, S. Lorentz, M.E. McClain, R.J. Naiman, Steven S. Perakis, G. Pinay, M.C. Scholes
2007, Ecosystems (10) 1231-1249
This review article describes vectors for nitrogen and phosphorus delivery to riparian zones in semiarid African savannas, the processing of nutrients in the riparian zone and the effect of disturbance on these processes. Semiarid savannas exhibit sharp seasonality, complex hillslope hydrology and high spatial heterogeneity, all of which ultimately impact...
Egg clutch characteristics of the barking treefrog, Hyla gratiosa, from North Carolina and Florida
M. S. Gunzburger, J. Travis
2007, Herpetological Review (38) 22-24
[No abstract available]...
Eo-Ulrichian to Neo-Ulrichian views: The renaissance of "layer-cake stratigraphy"
Carlton E. Brett, P.I. McLaughlin, G.C. Baird
2007, Conference Paper, Stratigraphy
Classical notions of "layer-cake stratigraphy" have been denigrated as representing an antiquated "Neptunian" view of the geologic record with the American paleontologist-stratigrapher E.O. Ulrich vilified as its quintessential advocate. Some of the extreme "layer-cake" interpretations of E.O. Ulrich are demonstrably incorrect, especially where applied in marginal marine and terrestrial settings....
The occurrence of the colonial ascidian Didemnum sp. on Georges Bank gravel habitat: ecological observations and potential effects on groundfish and scallop fisheries
P. C. Valentine, J.S. Collie, R.N. Reid, R. G. Asch, Vincent G. Guida, D.S. Blackwood
2007, Journal of Experimental Marine Biology and Ecology (342) 179-181
The colonial ascidian Didemnum sp. is present on the Georges Bank fishing grounds in a gravel habitat where the benthic invertebrate fauna has been monitored annually since 1994. The species was not noted before 2002 when large colonies were first observed; and by 2003 and 2004 it covered large areas...
Aquifer-scale controls on the distribution of nitrate and ammonium in ground water near La Pine, Oregon, USA
Stephen R. Hinkle, John Karl Bohlke, John H. Duff, David S. Morgan, Rodney J. Weick
2007, Journal of Hydrology (333) 486-503
Geochemical and isotopic tools were applied at aquifer, transect, and subtransect scales to provide a framework for understanding sources, transport, and fate of dissolved inorganic N in a sandy aquifer near La Pine, Oregon. NO3 is a common contaminant in shallow ground water in this area, whereas high concentrations of...
Denitrification in the shallow ground water of a tile-drained, agricultural watershed
E. Mehnert, H.-H. Hwang, T.M. Johnson, R.A. Sanford, W.C. Beaumont, T.R. Holm
2007, Journal of Environmental Quality (36) 80-90
Nonpoint-source pollution of surface water by N is considered a major cause of hypoxia. Because Corn Belt watersheds have been identified as major sources of N in the Mississippi River basin, the fate and transport of N from midwestern agricultural watersheds have received considerable interest. The fate and transport of...
Growth rate differences between resident native brook trout and non-native brown trout
S.M. Carlson, A.P. Hendry, B. H. Letcher
2007, Journal of Fish Biology (71) 1430-1447
Between species and across season variation in growth was examined by tagging and recapturing individual brook trout Salvelinus fontinalis and brown trout Salmo trutta across seasons in a small stream (West Brook, Massachusetts, U.S.A.). Detailed information on body size and growth are presented to (1) test whether the two species...
Survival and tag retention of Pacific lamprey larvae and macrophthalmia marked with coded wire tags
M.H. Meeuwig, A.L. Puls, J.M. Bayer
2007, North American Journal of Fisheries Management (27) 96-102
We examined the survival, tag retention, and growth of Pacific lamprey Lampetra tridentata larvae and macrophthalmia marked with standard-length decimal coded wire tags and exposed to two levels of handling stress. The survival of marked individuals did not differ from that of unmarked individuals at either life stage for the...
Microbial sulfate reduction and metal attenuation in pH 4 acid mine water
C.D. Church, R.T. Wilkin, Charles N. Alpers, R. O. Rye, R.B. Blaine
2007, Geochemical Transactions (8)
Sediments recovered from the flooded mine workings of the Penn Mine, a Cu-Zn mine abandoned since the early 1960s, were cultured for anaerobic bacteria over a range of pH (4.0 to 7.5). The molecular biology of sediments and cultures was studied to determine whether sulfate-reducing bacteria (SRB) were active in...
Bacterioplankton communities of Crater Lake, OR: Dynamic changes with euphotic zone food web structure and stable deep water populations
E. Urbach, K.L. Vergin, G.L. Larson, S. J. Giovannoni
2007, Hydrobiologia (574) 161-177
The distribution of bacterial and archaeal species in Crater Lake plankton varies dramatically over depth and with time, as assessed by hybridization of group-specific oligonucleotides to RNA extracted from lakewater. Nonmetric, multidimensional scaling (MDS) analysis of relative bacterial phylotype densities revealed complex relationships among assemblages sampled from depth profiles in...
Influence of land use and climate on wetland breeding birds in the Prairie Pothole region of Canada
G.M. Forcey, G.M. Linz, W.E. Thogmartin, W.J. Bleier
2007, Canadian Journal of Zoology (85) 421-436
Bird populations are influenced by a variety of factors at both small and large scales that range from the presence of suitable nesting habitat, predators, and food supplies to climate conditions and land-use patterns. We evaluated the influences of regional climate and land-use variables on wetland breeding birds in the...
