Estimating debris-flow probability using fan stratigraphy, historic records, and drainage-basin morphology, Interstate 70 highway corridor, central Colorado, U.S.A
J. A. Coe, J. W. Godt, M. Parise, A. Moscariello
Rickenmann D.Chen C.L., editor(s)
2003, Conference Paper, International Conference on Debris-Flow Hazards Mitigation: Mechanics, Prediction, and Assessment, Proceedings
We have used stratigraphic and historic records of debris-flows to estimate mean recurrence intervals of past debris-flow events on 19 fans along the Interstate 70 highway corridor in the Front Range of Colorado. Estimated mean recurrence intervals were used in the Poisson probability model to estimate the probability of future...
Improving ground-penetrating radar data in sedimentary rocks using deterministic deconvolution
J. Xia, E. K. Franseen, R. D. Miller, T.V. Weis, A.P. Byrnes
2003, Journal of Applied Geophysics (54) 15-33
Resolution is key to confidently identifying unique geologic features using ground-penetrating radar (GPR) data. Source wavelet "ringing" (related to bandwidth) in a GPR section limits resolution because of wavelet interference, and can smear reflections in time and/or space. The resultant potential for misinterpretation limits the usefulness of GPR. Deconvolution offers...
Interactions of bullfrog tadpole predators and an insecticide: Predation release and facilitation
M.D. Boone, R. D. Semlitsch
2003, Oecologia (137) 610-616
The effect of a contaminant on a community may not be easily predicted, given that complex changes in food resources and predator-prey dynamics may result. The objectives of our study were to determine the interactive effects of the insecticide carbaryl and predators on body size, development, survival, and activity of...
Fire and invasive plants in California ecosystems
Jon E. Keeley
2003, Fire Management Today (63) 18-19
Plant community patterns in unburned and burned blackbrush (Coleogyne ramosissima) shrublands in the Mojave Desert
Matthew L. Brooks, John R. Matchett
2003, Western North American Naturalist (63) 283-298
The blackbrush vegetation type is dominated by Coleogyne ramossisima, which is thought to preclude the coexistence of many other plant species. Fire can remove blackbrush cover and possibly increase plant species richness and evenness. Fire also may increase the frequency and cover of alien annual grasses, thereby intensifying landscape flammability....
Spatial use and habitat associations of Columbian white-tailed deer fawns in southwestern Oregon
M.A. Ricca, R.G. Anthony, Dewaine H. Jackson, S.A. Wolfe
2003, Northwest Science (77) 72-80
Fawns represent a critical life history stage in the dynamics of deer populations, yet little recent information is available on the ecology of neonatal Columbian white-tailed deer (CWTD), a geographically isolated and federally endangered sub-species. We described home ranges, areas of concentrated use, and habitat associations of CWTD fawns in...
Status of Alabama shad and skipjack herring in Gulf of Mexico drainages
M.F. Mettee, P. E. O’Neil
2003, American Fisheries Society Symposium (2003) 157-170
Gulf of Mexico drainages are inhabited by two alosine species, the anadromous Alabama shad Alosa alabamae and the skipjack herring A. chrysochloris. Although their distributions are reasonably well documented, the life history and ecology of both species has been incompletely investigated. Infrequent literature references suggest populations of both species have...
How should environmental stress affect the population dynamics of disease?
Kevin D. Lafferty, Robert D. Holt
2003, Ecology Letters (6) 654-664
We modelled how stress affects the population dynamics of infectious disease. We were specifically concerned with stress that increased susceptibility of uninfected hosts when exposed to infection. If such stresses also reduced resources, fecundity and/or survivorship, there was a reduction in the host carrying capacity. This lowered the contact between...
Relating species abundance distributions to species-area curves in two Mediterranean-type shrublands
Jon E. Keeley
2003, Diversity and Distributions (9) 253-259
Based on both theoretical and empirical studies there is evidence that different species abundance distributions underlie different species-area relationships. Here I show that Australian and Californian shrubland communities (at the scale from 1 to 1000 m2) exhibit different species-area relationships and different species abundance patterns. The species-area relationship in Australian heathlands...
Advection, pelagic food webs and the biogeography of seabirds in Beringia
John F. Piatt, Alan M. Springer
2003, Marine Ornithology: Journal of Seabird Research and Conservation (31) 141-154
Despite its great distance from productive shelf-edge habitat, the inner shelf area of the Bering Sea, from St. Lawrence Island to the Bering Strait, supports a surprisingly large number (>5 million) of seabirds during summer, mostly small plantivorous auklets (65%) and large piscivorous murres (19%) and kittiwakes (5%). This paradox...
Direct assessment of groundwater vulnerability from single observations of multiple contaminants
Fred Worrall, Dana W. Kolpin
2003, Water Resources Research (39) 2-1-2-8
Groundwater vulnerability is a central concept in pollution risk assessment, yet its estimation has been largely a matter of expert judgment. This work applies a method for the direct calculation of vulnerability from monitoring well observations of pesticide concentrations. The method has two major advantages: it is independent of the...
A 16,000 14C yr B.P. packrat midden series from the USA-Mexico Borderlands
C.A. Holmgren, M.C. Penalba, K.A. Rylander, J.L. Betancourt
2003, Quaternary Research (60) 319-329
A new packrat midden chronology from Playas Valley, southwestern New Mexico, is the first installment of an ongoing effort to reconstruct paleovegetation and paleoclimate in the U.S.A.-Mexico Borderlands. Playas Valley and neighboring basins supported pluvial lakes during full and/or late glacial times. Plant macrofossil and pollen assemblages from nine middens...
The typological approach to submarine groundwater discharge (SGD)
H. Bokuniewicz, R. Buddemeier, B. Maxwell, C. Smith
2003, Biogeochemistry (66) 145-158
Coastal zone managers need to factor submarine groundwater discharge (SGD) in their integration. SGD provides a pathway for the transfer of freshwater, and its dissolved chemical burden, from the land to the coastal ocean. SGD reduces salinities and provides nutrients to specialized coastal habitats. It also can be a pollutant...
Influences of upland and riparian land use patterns on stream biotic integrity
C.D. Snyder, J.A. Young, R. Villella, D. P. Lemarie
2003, Landscape Ecology (18) 647-664
We explored land use, fish assemblage structure, and stream habitat associations in 20 catchments in Opequon Creek watershed, West Virginia. The purpose was to determine the relative importance of urban and agriculture land use on stream biotic integrity, and to evaluate the spatial scale (i.e., whole-catchment vs riparian buffer) at...
Fish faunal resurgence in Lake Nabugabo, East Africa
L.J. Chapman, Colin A. Chapman, P. J. Schofield, J.P. Olowo, L.S. Kaufman, O. Seehausen, R. Ogutu-Ohwayo.
2003, Conservation Biology (17) 500-511
In Lake Nabugabo, Uganda, a small satellite of the equatorial Lake Victoria, approximately 50% of the indigenous fish species disappeared from the open waters subsequent to establishment of the introduced predatory Nile perch ( Lates niloticus ). However, several of these species persisted in wetland refugia. Over the past decade, Nile perch...
Microparasite assemblages of conspecific shrew populations in Southern California
J. Laakkonen, Robert N. Fisher, T. J. Case
2003, Journal of Parasitology (89) 1153-1158
The microparasite component communities of 2 species of shrews, Notiosorex crawfordi and Sorex ornatus, were investigated for the first time in 2 isolated and 3 continuous landscapes in southern California. With microscopical examination, a total of 6 parasite species was found in N. crawfordi and 8 species in S. ornatus....
Etude sur la Tortue-boite de Floride (Terrapene carolina bauri) a Egmont Key, Floride
C.K. Dodd Jr.
2003, Manouria (20) 26-34
Abstract not supplied at this time...
Introduced species and their missing parasites
Mark E. Torchin, Kevin D. Lafferty, Andrew P. Dobson, Valerie J. McKenzie, Armand M. Kuris
2003, Nature (421) 628-630
Damage caused by introduced species results from the high population densities and large body sizes that they attain in their new location. Escape from the effects of natural enemies is a frequent explanation given for the success of introduced species. Because some parasites can reduce host density and decrease body size,...
Quantitative morphology of a fringing reef tract from high-resolution laser bathymetry: Southern Molokai, Hawaii
C. D. Storlazzi, J.B. Logan, M.E. Field
2003, Geological Society of America Bulletin (115) 1344-1355
High-resolution Scanning Hydrographic Operational Airborne Lidar Survey (SHOALS) laser-determined bathymetric data were used to define the morphology of spur-and-groove structures on the fringing reef off the south coast of Molokai, Hawaii. These data provide a basis for mapping and analyzing morphology of the reef with a level of precision and...
Impacts of Daily Bag Limit Reductions on Angler Effort in Wisconsin Walleye Lakes
T.D. Beard Jr., S.P. Cox, S.R. Carpenter
2003, North American Journal of Fisheries Management (23) 1283-1293
Angler effort is an important factor affecting recreational fisheries. However, angler responses are rarely incorporated into recreational fisheries regulations or predictions. Few have attempted to examine how daily bag limit regulations affect total angling pressure and subsequent stock densities. Our paper develops a theoretical basis for predicting angler effort and...
Changes in trace and minor constituents and associated micro-architecture of Montastrea faveolata during time of "stress"
C. W. Holmes, N.A. Buster, J.E. Sorauf, J.H. Hudson, C. Kester
2003, Conference Paper, Oceans Conference Record (IEEE)
As corals grow, they secrete a calcareous skeleton with the aid of photosynthetic activity of endosymbiotic dinoflagellates. The rate of this secretion varies annually which produces annual bands. Entrapped with the carbonate are trace substances that record the chemistry of the surrounding ocean. Detailing these changes in chemistry requires careful...
A genetic survey of Salvinia minima in the southern United States
Paul T. Madeira, Colette C. Jacono, Phil Tipping, Thai K. Van, Ted D. Center
2003, Aquatic Botany (76) 127-139
No abstract available....
Using ground-placed PVC pipes to monitor hylid treefrogs: Capture biases
M. Zacharow, W.J. Barichivich, C.K. Dodd Jr.
2003, Southeastern Naturalist (2) 575-590
We sampled a population of two species of hylid treefrogs using 90 vertical ground-placed PVC pipes of 3 diameters positioned along a 1500-m transect at a forest-open pond ecotone in north-central Florida in order to identify potential capture biases. We recorded 1,981 treefrog observations (778 unmarked, 1,203 recaptures) in 8...
Rare male aggression directed toward females in a female-dominated society: Baiting behavior in the spotted hyena
Micaela Szykman, Anne L. Engh, Russell C. Van Horn, Erin E. Boydston, Kim T. Scribner, Kay E. Holekamp
2003, Aggressive Behavior (29) 457-474
Spotted hyenas (Crocuta crocuta) are gregarious carnivores. The females are socially dominant to males, and adult males rarely direct aggression toward adult females. This study analyzed all cases in which adult immigrant males behaved aggressively toward adult females in a large population of free-living hyenas in Kenya, observed for 11...
Salinity tolerance of two gobies (Microgobius gulosus, Gobiosoma robustum) in Florida Bay (USA)
P. J. Schofield
2003, Gulf of Mexico Science (21) 86-91
No abstract available....
