Publications
Read publications and other informational products to learn more about USGS science occurring in the Mississippi Basin.
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Acute and chronic toxicity of lead in water and diet to the amphipod Hyalella azteca Acute and chronic toxicity of lead in water and diet to the amphipod Hyalella azteca
We evaluated the influence of waterborne and dietary lead (Pb) exposure on the acute and chronic toxicity of Pb to the amphipod Hyalella azteca. Test solutions were generated by a modified diluter with an extended (24‐h) equilibration period. Acute (96‐h) toxicity of Pb varied with water hardness in the range of 71 to 275 mg/L as CaCO3, despite similar dissolved Pb concentrations. Acute...
Authors
J.M. Besser, W. G. Brumbaugh, E.L. Brunson, C.G. Ingersoll
Improving removal-based estimates of abundance by sampling a population of spatially distinct subpopulations Improving removal-based estimates of abundance by sampling a population of spatially distinct subpopulations
A statistical modeling framework is described for estimating the abundances of spatially distinct subpopulations of animals surveyed using removal sampling. To illustrate this framework, hierarchical models are developed using the Poisson and negative-binomial distributions to model variation in abundance among subpopulations and using the beta distribution to model variation in capture
Authors
R.M. Dorazio, H.L. Jelks, F. Jordan
Developmental biology and ecology of the Kemp's ridley sea turtle. Lepidochelys kempii, in the eastern Gulf of Mexico Developmental biology and ecology of the Kemp's ridley sea turtle. Lepidochelys kempii, in the eastern Gulf of Mexico
Abstract not supplied at this time
Authors
J.R. Schmid, W.J. Barichivich
Spatiotemporal patterns of fish assemblage structure in a river impounded by low-head dams Spatiotemporal patterns of fish assemblage structure in a river impounded by low-head dams
We studied spatiotemporal patterns of fish assemblage structure in the Neosho River, Kansas, a system impounded by low-head dams. Spatial variation in the fish assemblage was related to the location of dams that created alternating lotic and lentic stream reaches with differing fish assemblages. At upstream sites close to dams, assemblages were characterized by species associated with...
Authors
David P. Gillette, Jeremy S. Tiemann, David R. Edds, Mark L. Wildhaber
Selenium impacts on razorback sucker, Colorado River, Colorado: II. Eggs Selenium impacts on razorback sucker, Colorado River, Colorado: II. Eggs
Effects on hatching and development of fertilized eggs in adult razorback sucker (Xyrauchen texanus) exposed to selenium in flooded bottomland sites near Grand Junction, Colorado, were determined. After 9 months exposure, fish were collected and induced to spawn and eggs collected for inorganic element analyses. A 9-day egg study was conducted with five spawns from Horsethief ponds, six...
Authors
S. J. Hamilton, K.M. Holley, K.J. Buhl, F.A. Bullard
Temporal and spatial variation of early mortality syndrome in salmonids from Lakes Michigan and Huron Temporal and spatial variation of early mortality syndrome in salmonids from Lakes Michigan and Huron
To assess the extent that early mortality syndrome (EMS) impacts different Pacific salmonid stocks and the association of EMS with thiamine, we collected eggs of coho salmon Oncorhynchus kisutch from three Lake Michigan tributaries (Platte River, Thompson Creek, and Root River) in 1996-2001. We also obtained eggs of Chinook salmon O. tshawytscha from Lake Michigan (Little Manistee River)...
Authors
M. Wolgamood, J.G. Hnath, S.B. Brown, K. Moore, S.V. Marcquenski, D. C. Honeyfield, J. P. Hinterkopf, J.D. Fitzsimons, D. E. Tillitt
Reduced growth and survival of larval razorback sucker fed selenium-laden zooplankton Reduced growth and survival of larval razorback sucker fed selenium-laden zooplankton
Four groups of larval razorback sucker, an endangered fish, were exposed to selenium-laden zooplankton and survival, growth, and whole-body residues were measured. Studies were conducted with 5, 10, 24, and 28-day-old larvae fed zooplankton collected from six sites adjacent to the Green River, Utah. Water where zooplankton were collected had selenium concentrations ranging from
Authors
Steven J. Hamilton, Kevin J. Buhl, Fern A. Bullard, Susan McDonald
Species frequency dynamics in an old-field succession: Effects of disturbance, fertilization and scale Species frequency dynamics in an old-field succession: Effects of disturbance, fertilization and scale
Question:
Authors
David J. Gibson, Beth A. Middleton, K. Foster, Y. A. K. Honu, E. W. Hoyer, M. Mathis
Red Hills salamander. Phaeognathus hubrichti Highton, 1961 Red Hills salamander. Phaeognathus hubrichti Highton, 1961
Abstract not supplied at this time
Authors
C.K. Dodd
Does biofilm contribute to diel cycling of Zn in High Ore Creek, Montana? Does biofilm contribute to diel cycling of Zn in High Ore Creek, Montana?
Concentrations of metals cycle daily in the water column of some mining-impacted streams in the Rocky Mountains of the western USA. We hypothesized that biofilm in High Ore Creek, Montana, USA, sorbs and releases Zn on a diel cycle, and this uptake-and-release cycle controls the total and dissolved (0.45-μm filtered) Zn concentrations. We collected water samples from three sites...
Authors
J.M. Morris, D. A. Nimick, A.M. Farag, J.S. Meyer
Spartina alterniflora genotype influences facilitation and suppression of high marsh species colonizing an early successional salt marsh Spartina alterniflora genotype influences facilitation and suppression of high marsh species colonizing an early successional salt marsh
Genetically based phenotypic and ecotypic variation in a dominant plant species can influence ecological functions and patterns of recruitment by other species in plant communities. However, the nature and degree of importance of genotypic differences is poorly understood in most systems.The dominant salt marsh species, Spartina alterniflora, is known to induce facilitative and...
Authors
C.E. Proffitt, R.L. Chiasson, A.B. Owens, K.R. Edwards, S.E. Travis