Publications
Read publications and other informational products to learn more about USGS science occurring in the Mississippi Basin.
Filter Total Items: 5568
Invasion in a diversity hotspot: Exotic cover and native richness in the Californian serpentine flora Invasion in a diversity hotspot: Exotic cover and native richness in the Californian serpentine flora
Exotic species have been observed to be more prevalent in sites where the richness of native species is highest, possibly reflecting variation among sites in resources, propagule supply, heterogeneity, or disturbance. However, such a pattern leaves unclear whether natives at species-rich sites are subject to especially severe impacts from exotics as a result. We considered this question...
Authors
S. Harrison, J.B. Grace, K.F. Davies, H.D. Safford, J.H. Viers
Hydroecological modeling of the Lower Missouri River Hydroecological modeling of the Lower Missouri River
No abstract avaikable
Authors
H.E. Johnson, R. B. Jacobson, A. J. DeLonay
Interlaboratory evaluation of Hyalella azteca and Chironomus tentans short-term and long-term sediment toxicity tests Interlaboratory evaluation of Hyalella azteca and Chironomus tentans short-term and long-term sediment toxicity tests
Methods for assessing the long-term toxicity of sediments to Hyalella azteca and Chironomus tentans can significantly enhance the capacity to assess sublethal effects of contaminated sediments through multiple endpoints. Sublethal tests allow us to begin to understand the relationship between short-term and long-term effects for toxic sediments. We present an interlaboratory evaluation...
Authors
T. J. Norberg-King, P.K. Sibley, G.A. Burton, C.G. Ingersoll, N.E. Kemble, S. Ireland, D.R. Mount, C.D. Rowland
Mapping vegetation communities in Ozark National Scenic Riverways: final technical report to the National Park Service Mapping vegetation communities in Ozark National Scenic Riverways: final technical report to the National Park Service
Vegetation communities were mapped at two levels in Ozark National Scenic Riverways (ONSR) usign a hybrid combination of statistical methods and photointerpretation. The primary map includes 49 cover classes, including 24 cleasses that relate to vegetation associations currenly described by the United States National Vegetation Classification Standard (USNVC: The Nature Conservancy...
Authors
Robert A. Chastain, Matthew A. Struckhoff, Keith W. Grabner, Esther D. Stroh, Hong He, David R. Larsen, Timothy A. Nigh, Jim Drake
Vanishing before our eyes Vanishing before our eyes
No abstract available
Authors
Wylie C. Barrow, William R. Fontenot, Madeline H. Barrow, Richard A. DeMay, David Muth
Endocrine disrupting chemicals and endocrine active agents Endocrine disrupting chemicals and endocrine active agents
Abstract not supplied at this time
Authors
T. S. Gross, B.S. Arnold, M. S. Sepulveda, K. McDonald
Acoustic bed velocity and bed load dynamics in a large sand bed river Acoustic bed velocity and bed load dynamics in a large sand bed river
Development of a practical technology for rapid quantification of bed load transport in large rivers would represent a revolutionary advance for sediment monitoring and the investigation of fluvial dynamics. Measurement of bed load motion with acoustic Doppler current profiles (ADCPs) has emerged as a promising approach for evaluating bed load transport. However, a better understanding...
Authors
D. Gaeuman, R. B. Jacobson
Lake sturgeon population characteristics in Rainy Lake, Minnesota and Ontario Lake sturgeon population characteristics in Rainy Lake, Minnesota and Ontario
Rainy Lake contains a native population of lake sturgeon Acipenser fulvescens that has been largely unstudied. The aims of this study were to document the population characteristics of lake sturgeon in Rainy Lake and to relate environmental factors to year-class strength for this population. Gill-netting efforts throughout the study resulted in the capture of 322 lake sturgeon, including...
Authors
W.E. Adams, L.W. Kallemeyn, D.W. Willis
Habitat associations of chorusing anurans in the Lower Mississippi River Alluvial valley Habitat associations of chorusing anurans in the Lower Mississippi River Alluvial valley
Amphibian populations have declined worldwide. To pursue conservation efforts adequately, land managers need more information concerning amphibian habitat requirements. To address this need, we examined relationships between anurans and habitat characteristics of wetlands in the Lower Mississippi River Alluvial Valley (LMAV). We surveyed chorusing anurans in 31 wetlands in 2000 and 28...
Authors
J.S. Lichtenberg, S.L. King, J.B. Grace, S.C. Walls
Reproductive condition and occurrence of intersex in bighead carp and silver carp in the Missouri River Reproductive condition and occurrence of intersex in bighead carp and silver carp in the Missouri River
Little is known about the reproductive biology of the exotic bighead carp Hypophthalmichthys nobilis and silver carp Hypophthalmichthys molitrix in the Missouri River. In order to fill this gap in understanding, herein is described the reproductive condition of these Asian carps. Evidence is presented which indicates that bighead and silver carp in the Missouri River have a protracted...
Authors
D. M. Papoulias, D. Chapman, D. E. Tillitt
Urban contributions of glyphosate and its degradate AMPA to streams in the United States Urban contributions of glyphosate and its degradate AMPA to streams in the United States
Glyphosate is the most widely used herbicide in the world, being routinely applied to control weeds in both agricultural and urban settings. Microbial degradation of glyphosate produces aminomethyl phosphonic acid (AMPA). The high polarity and water-solubility of glyphosate and AMPA has, until recently, made their analysis in water samples problematic. Thus, compared to other herbicides...
Authors
D.W. Kolpin, E.M. Thurman, E.A. Lee, M. T. Meyer, E. T. Furlong, S.T. Glassmeyer
Ornate box turtle (Terrapene ornata ornata): A technical conservation assessment. [Online] Ornate box turtle (Terrapene ornata ornata): A technical conservation assessment. [Online]
Abstract not supplied at this time
Authors
A. Redder, C.K. Dodd, D. Keinath, D. McDonald, T. Ise