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Publications

Publications from USGS science centers throughout the Southeast Region.

Filter Total Items: 10417

A structural equation model analysis of postfire plant diversity in California shrublands A structural equation model analysis of postfire plant diversity in California shrublands

This study investigates patterns of plant diversity following wildfires in fire‐prone shrublands of California, seeks to understand those patterns in terms of both local and landscape factors, and considers the implications for fire management. Ninety study sites were established following extensive wildfires in 1993, and 1000‐m2 plots were used to sample a variety of parameters. Data on...
Authors
J.B. Grace, Jon E. Keeley

Influence of propagule flotation longevity and light availability on establishment of introduced mangrove species in Hawai'i Influence of propagule flotation longevity and light availability on establishment of introduced mangrove species in Hawai'i

Although no mangrove species are native to the Hawaiian Archipelago, both Rbizopbora mangle and Bruguiera sexangula were introduced and have become naturalized. Rbizopbora mangle has spread to almost every major Hawaiian island, but B. sexangula has established only on O'ahu, where it was intentionally introduced. To examine the possibility that differences in propagule characteristics...
Authors
J. A. Allen, K. W. Krauss

Assessment of reproductive effects in largemouth bass (Micropterus salmoides) exposed to bleached/unbleached kraft mill effluents Assessment of reproductive effects in largemouth bass (Micropterus salmoides) exposed to bleached/unbleached kraft mill effluents

This study evaluated the potential effects of different concentrations of bleached/unbleached kraft mill effluent (B/UKME) on several reproductive endpoints in adult largemouth bass (Micropterus salmoides). The kraft mill studied produces a 50/50 mix of bleached/unbleached market pulp with an estimated release of 36 million gal of effluent/day. Bleaching sequences were C90d10EopHDp and...
Authors
M. S. Sepulveda, D. S. Ruessler, N. D. Denslow, S. E. Holm, T. R. Schoeb, T. S. Gross

Response of Tridens flavus (L.) A. S. Hitchc. to soil nutrients and disturbance in an early successional old field Response of Tridens flavus (L.) A. S. Hitchc. to soil nutrients and disturbance in an early successional old field

Soil nutrients and disturbance are two of the main abiotic factors that influence plant dominance (canopy cover), density, and fecundity in early successional old field plant communities. The manner in which the dominant species in old field successional systems respond to the interaction of nutrients and disturbance is poorly known. We examined the dominance, density of flowering...
Authors
Y. A. K. Honu, D.J. Gibson, B.A. Middleton

Dietary exposure of mink (Mustela vison) to fish from the Housatonic River, Berkshire County, Massachusetts, USA: Effects on reproduction, kit growth, and survival Dietary exposure of mink (Mustela vison) to fish from the Housatonic River, Berkshire County, Massachusetts, USA: Effects on reproduction, kit growth, and survival

We evaluated the effects of feeding farm-raised mink (Mustela vison) diets containing polychlorinated biphenyl (PCB)-contaminated fish from the Housatonic River (HR; Berkshire County, MA, USA) on adult reproductive performance and kit growth and survival. Diets contained 0.22-3.54% HR fish, providing 0.34-3.7 ??g total PCBs (TPCB)/g feed wet wt (3.5-68.5 pg toxic equivalence [TEQ]/g)...
Authors
S.J. Bursian, C. Sharma, R.J. Aulerich, B. Yamini, R.R. Mitchell, C.E. Orazio, D.R.J. Moore, S. Svirsky, D. E. Tillitt

Water-clover ferns, Marsilea, in the Southeastern United States Water-clover ferns, Marsilea, in the Southeastern United States

A surge in the collection of exotic Marsilea, M. mutica, M. minuta and M. hirsuta in the southeastern United States has prompted the need for updated identification aids. This study provides an annotated key to all water-clover ferns occurring in the region. It describes and illustrates recently documented exotic species and a previously misidentified western introduction. It details the
Authors
Colette C. Jacono, David M. Johnson

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

Nutrient Concentrations, Loads, and Yields in the Eucha-Spavinaw Basin, Arkansas and Oklahoma, 2002-2004 Nutrient Concentrations, Loads, and Yields in the Eucha-Spavinaw Basin, Arkansas and Oklahoma, 2002-2004

The City of Tulsa, Oklahoma, uses Lake Eucha and Spavinaw Lake in the Eucha-Spavinaw basin in northwestern Arkansas and northeastern Oklahoma for public water supply. Taste and odor problems in the water attributable to blue-green algae have increased in frequency over time. Changes in the algae community in the lakes may be attributable to increases in nutrient levels in the lakes, and...
Authors
Robert L. Tortorelli

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

Geochemistry of the Amazon Estuary Geochemistry of the Amazon Estuary

The Amazon River supplies more freshwater to the ocean than any other river in the world. This enormous volume of freshwater forces the estuarine mixing out of the river channel and onto the continental shelf. On the continental shelf, the estuarine mixing occurs in a very dynamic environment unlike that of a typical estuary. The tides, the wind, and the boundary current that sweeps the
Authors
Joseph M. Smoak, James M. Krest, Peter W Swarzenski

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
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