The use of coded microwire tags mark-recapture studies of juvenile Caribbean spiny lobster, Panulirus argus
W.C. Sharp, W.A. Lellis, M.J. Butler, W.F. Herrnkind, J.H. Hunt, M. Pardee-Woodring, T.R. Matthews
2000, Journal of Crustacean Biology (20) 510-521
To evaluate the suitability of using coded microwire tags (CWTs) to mark early-benthic-stage Caribbean spiny lobster, Panulirus argus, we compared the survival, growth, and feeding of tagged and untagged lobsters held in the laboratory through the first five juvenile molts. We also examined the growth of 65 microwire-tagged lobsters released...
Seagrass responses to and recovery (?) from seven years of brown tide
C.P. Onuf
2000, Pacific Conservation Biology (5) 306-313
Most harmful algal blooms are relatively short, violent paroxysms to aquatic systems. The Texas brown tide was unique in its 7-year domination of upper Laguna Madre wherein it reduced light penetrating 1 m from 31 to 63% on an annual basis between June 1990 and May 1997. In response, seagrasses...
The role of landscape and habitat characteristics in limiting abundance of grassland nesting songbirds in an urban open space
S. Haire, C.E. Bock, B.S. Cade, B.C. Bennett
2000, Landscape and Urban Planning (48) 65-82
We examine the relationships between abundance of grassland nesting songbirds observed in the Boulder Open Space, CO, USA and parameters that described landscape and habitat characteristics, in order to provide information for Boulder Open Space planners and managers. Data sets included bird abundance and plant species composition, collected during three...
Using multi-scale sampling and spatial cross-correlation to investigate patterns of plant species richness
M. A. Kalkhan, T.J. Stohlgren
2000, Environmental Monitoring and Assessment (64) 591-605
Land managers need better techniques to assess exoticplant invasions. We used the cross-correlationstatistic, IYZ, to test for the presence ofspatial cross-correlation between pair-wisecombinations of soil characteristics, topographicvariables, plant species richness, and cover ofvascular plants in a 754 ha study site in RockyMountain National Park, Colorado, U.S.A. Using 25...
Modeling the distributions of species and communities in Great Smoky Mountains National Park
S. Wilds, J.R. Boetsch, F.T. Van Manen, J. D. Clark, P.S. White
2000, Computers and Electronics in Agriculture (27) 389-392
No abstract available....
Application of the new keystone-species concept to prairie dogs: How well does it work?
N.B. Kotliar
2000, Conservation Biology (14) 1715-1721
It has been suggested that the keystone-species concept should be dropped from ecology and conservation, primarily because the concept is poorly defined. This prompted Power et al. (1996) to refine the definition: keystone species have large effects on community structure or ecosystem function (i.e., high overall importance), and this effect...
Biomarker response and health of polychlorinated biphenyl- and chlordane-contaminated paddlefish from the Ohio River Basin, USA
D.T. Gunderson, R. Miller, A. Mischler, K. Elpers, S.D. Mims, J.G. Millar, V. Blazer
2000, Environmental Toxicology and Chemistry (19) 2275-2285
Fifty paddlefish (Polyodon spathula) collected from two sites on the Ohio River and from one site on the Cumberland River, USA, were examined to determine gonad polychlorinated biphenyl (PCB) and chlordane concentrations, amounts of plasma sex steroids (testosterone and estradiol), hepatic microsomal ethoxyresorufin-O-deethylase (EROD) activity, and the presence of immunoreactive...
Changes in sea urchins and kelp following a reduction in sea otter density as a result of the Exxon Valdez oil spill
Thomas A. Dean, James L. Bodkin, Stephen C. Jewett, Daniel H. Monson, D. Jung
2000, Marine Ecology Progress Series (199) 281-291
Interactions between sea otters Enhydra lutris, sea urchins Strongylocentrotus droebachiensis, and kelp were investigated following the reduction in sea otter density in Prince William Sound, Alaska, after the Exxon Valdez oil spill in 1989. At northern Knight Island, a heavily oiled portion of the sound, sea otter abundance was reduced...
Data report: Mid-Pliocene diatom assemblages at sites 1016, 1021, and 1022
John A. Barron
Susan Nessler, Christine M. Miller, Lori L. Peters, editor(s)
2000, Proceedings of the Ocean Drilling Program: Scientific Results 167-4
Diatom assemblages from the middle part of the Pliocene (3.2-2.5 Ma) were investigated from Ocean Drilling Program Sites 1016, 1021, and 1022 in an effort to infer paleotemperature fluctuations off California.<span face="Verdana, Arial, Helvetica, sans-serif" data-mce-style="font-family:...
Mesohabitat use of threatened hemlock forests by breeding birds of the Delaware Water Gap National Recreation Area
R. M. Ross
2000, Hemlock Woolly Adelgid Newsletter (5) 6-8
Methodology and application of combined watershed and ground-water models in Kansas
M. Sophocleous, S.P. Perkins
2000, Journal of Hydrology (236) 185-201
Increased irrigation in Kansas and other regions during the last several decades has caused serious water depletion, making the development of comprehensive strategies and tools to resolve such problems increasingly important. This paper makes the case for an intermediate complexity, quasi-distributed, comprehensive, large-watershed model, which falls between the fully distributed,...
Comparing polychlorinated biphenyl concentrations and patterns in the Saginaw River using sediment, caged fish, and semipermeable membrane devices
K. R. Echols, R.W. Gale, T.R. Schwartz, J.N. Huckins, L.L. Williams, J.C. Meadows, D. Morse, J. D. Petty, C.E. Orazio, D. E. Tillitt
2000, Environmental Science & Technology (34) 4095-4102
Three techniques of assessing bioavailable polychlorinated biphenyls (PCBs) in the Saginaw River, MI, were compared: sediments, caged fish, and semipermeable membrane devices (SPMDs). SPMDs and caged fish were placed in the river for 28 days at five sites where sediments were also sampled. The samples were analyzed for PCB congeners...
Scaling up from field to region for wind erosion prediction using a field-scale wind erosion model and GIS
T.M. Zobeck, N. C. Parker, S. Haskell, K. Guoding
2000, Agriculture, Ecosystems and Environment (82) 247-259
Factors that affect wind erosion such as surface vegetative and other cover, soil properties and surface roughness usually change spatially and temporally at the field-scale to produce important field-scale variations in wind erosion. Accurate estimation of wind erosion when scaling up from fields to regions, while maintaining meaningful field-scale process...
Characterizing Manatee habitat use and seagrass grazing in Florida and Puerto Rico: Implications for conservation and management
L.W. Lefebvre, J.P. Reid, W.J. Kenworthy, J. A. Powell
2000, Pacific Conservation Biology (5) 289-298
The Indian River Lagoon on the Atlantic coast of Florida, USA, and the east coast of Puerto Rico provide contrasting environments in which the endangered West Indian Manatee Trichechus manatus experiences different thermal regimes and seagrass communities. We compare Manatee feeding behaviour in these two regions, examine the ecological effects...
Triggering of earthquake aftershocks by dynamic stresses
Debi Kilb, J. Gomberg, P. Bodin
2000, Nature (408) 570-574
It is thought that small 'static' stress changes due to permanent fault displacement can alter the likelihood of, or trigger, earthquakes on nearby faults. Many studies of triggering in the nearfield, particularly of aftershocks, rely on these static changes as the triggering agent and consider them only in terms of...
Aquifer response to stream-stage and recharge variations. II. Convolution method and applications
P. M. Barlow, L.A. DeSimone, A.F. Moench
2000, Journal of Hydrology (230) 211-229
In this second of two papers, analytical step-response functions, developed in the companion paper for several cases of transient hydraulic interaction between a fully penetrating stream and a confined, leaky, or water-table aquifer, are used in the convolution integral to calculate aquifer heads, streambank seepage rates, and bank storage that...
Bacteria and Archaea in acidic environments and a key to morphological identification
E. I. Robbins
2000, Hydrobiologia (433) 61-89
Natural and anthropogenic acidic environments are dominated by bacteria and Archaea. As many as 86 genera or species have been identified or isolated from pH <4.5 environments. This paper reviews the worldwide literature and provide tables of morphological characteristics, habitat information and a key for light microscope identification for the...
15N NMR study of nitrate ion structure and dynamics in hydrotalcite-like compounds
X. Hou, Kirkpatrick R. James, P. Yu, D. Moore, Y. Kim
2000, American Mineralogist (85) 173-180
We report here the first nuclear magnetic resonance (NMR) spectroscopic study of the dynamical and structural behavior of nitrate on the surface and in the interlayer of hydrotalcite-like compounds (15NO3--HT). Spectroscopically resolvable surface-absorbed and interlayer NO3- have dramatically different dynamical characteristics. The interlayer nitrate shows a well defined, temperature independent...
Richness and diversity of helminth communities in tropical freshwater fishes: Empirical evidence
A. Choudhury, T.A. Dick
2000, Journal of Biogeography (27) 935-956
Aim: Published information on the richness and diversity of helminth parasite communities in tropical freshwater fishes is reviewed in response to expectations of species-rich parasite communities in tropical regions. Location: Areas covered include the tropics and some subtropical areas. In addition, the north temperate area of the nearctic zone is...
A method for mapping apparent stress and energy radiation applied to the 1994 Northridge earthquake fault zone
Art McGarr, Joe B. Fletcher
2000, Geophysical Research Letters (27) 1953-1956
Using the Northridge earthquake as an example, we demonstrate a new technique able to resolve apparent stress within subfaults of a larger fault plane. From the model of Wald et al. (1996), we estimated apparent stress for each subfault using τa = (G/β)/2 where G is the modulus of rigidity,...
High-Resolution Thermal Inertia Mapping from the Mars Global Surveyor Thermal Emission Spectrometer
M. T. Mellon, B. M. Jakosky, H. H. Kieffer, P. R. Christensen
2000, Icarus (148) 437-455
High-resolution thermal inertia mapping results are presented, derived from Mars Global Surveyor (MGS) Thermal Emission Spectrometer (TES) observations of the surface temperature of Mars obtained during the early portion of the MGS mapping mission. Thermal inertia is the key property controlling the diurnal surface temperature variations, and is dependent on...
Population estimates of Nearctic shorebirds
R. I. G. Morrison, Robert E. Gill Jr., B. A. Harrington, S. K. Skagen, G. W. Page, C. L. Gratto-Trevor, S. M. Haig
2000, Waterbirds (23) 337-352
Estimates are presented for the population sizes of 53 species of Nearctic shorebirds occurring regularly in North America, plus four species that breed occasionally. Shorebird population sizes were derived from data obtained by a variety of methods from breeding, migration and wintering areas, and formal assessments of accuracy of counts...
Orbital and suborbital variability in North Atlantic bottom water temperature obtained from deep-sea ostracod Mg/Ca ratios
T. M. Cronin, G. S. Dwyer, P.A. Baker, J. Rodriguez-Lazaro, D.M. DeMartino
2000, Palaeogeography, Palaeoclimatology, Palaeoecology (162) 45-57
Magnesium/calcium (Mg/Ca) ratios were measured in the deep-sea ostracod (Crustacea) genus Krithe from Chain core 82-24-4PC from the western mid-Atlantic Ridge (3427 m) in order to estimate ocean circulation and bottom water temperature (BWT) variability over the past 200,000 years. Mg/Ca ratios have been used as a paleothermometer because the ratios...
Distribution, movements, and habitat use of razorback sucker (Xyrauchen texanus) in a lower Colorado River Reservoir, Arizona-Nevada
G.A. Mueller, P.C. Marsh, G. Knowles, T. Wolters
2000, Western North American Naturalist (60) 180-187
Distribution, movements, and habitat use of 10 wild adult razorback suckers (Xyrauchen texanus) were examined in Lake Mohave, Arizona-Nevada, from November 1994 through July 1997. Movement rates (0.00-17.35 km d⁻¹) and ranges (x̄ = 39 km) were similar to those for riverine populations. All study fish returned to spawning sites...
Organic matter sources and rehabilitation of the Sacramento-San Joaquin Delta (California, USA)
A.D. Jassby, James E. Cloern
2000, Aquatic Conservation: Marine and Freshwater Ecosystems (10) 323-352
1. The Sacramento San Joaquin River Delta, a complex mosaic of tidal freshwater habitats in California, is the focus of a major ecosystem rehabilitation effort because of significant long-term changes in critical ecosystem functions. One of these functions is the production, transport and transformation of organic matter that constitutes the...
