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Environmental contaminants in redheads wintering in coastal Louisiana and Texas Environmental contaminants in redheads wintering in coastal Louisiana and Texas

Whole body and liver analyses indicated that wintering redheads (Aythya americana; n = 70) in coastal Louisiana (one site) and Texas (two sites) were relatively free of contamination with common trace elements, organochlorines, and hydrocarbons. Most trace elements, including As, Cr, Hg, Mg, Mn, Ni, Pb, Se, Sr, and Zn, were within background concentrations in livers; levels of B, Cd, Cu...
Authors
T.C. Michot, T. W. Custer, A.J. Nault, C. A. Mitchell

The Freshwater Fishes of Virginia The Freshwater Fishes of Virginia

Abstract not supplied at this time
Authors
R.E. Jenkins, N.M. Burkhead

Freshwater bivalves Freshwater bivalves

Abstract not supplied at this time
Authors
J.D. Williams, R.S. Butler

Recent accretion in two managed marsh impoundments in coastal Louisiana Recent accretion in two managed marsh impoundments in coastal Louisiana

Recent accretion was measured by the feldspar marker horizon method in two gravity-drained, managed, marsh impoundments and unmanaged reference marshes located on the rapidly subsiding coast of Louisiana. Water level management was designed to limit hydrologic exchange to the managed marsh by regulating the direction and rate of water flows. During a drawdown-flooding water management...
Authors
Donald R. Cahoon

Production and decomposition of Spartina patens in a degrading coastal marsh Production and decomposition of Spartina patens in a degrading coastal marsh

Production and decomposition rates were calculated for Spartina patens in a mesohaline coastal marsh in Louisiana. Production was estimated to be 800 g m2 yr-1 during 1991 and 1,696 g m-1 yr-1 during 1992. The relative decomposition rate of S. patens stems was -0.001152 g g-1 d-1 which may be restated as a half life of 395 days. Both production and decomposition rates for this area are...
Authors
Lori A. Johnson, Kathleen A. Reynolds, A. Lee Foote

Diet differences in Redheads from nearshore and offshore zones in Louisiana Diet differences in Redheads from nearshore and offshore zones in Louisiana

Habitat management decisions for diving ducks in winter are limited by the lack of information concerning their use of nearshore and offshore zones. Therefore, we compared diets of redheads (Aythya americana) collected from nearshore (n = 206) and offshore (n = 72) zones during winters at the Chandeleur Islands, Louisiana, 1987-89. A greater (P 0.05) proportion of redheads from nearshore...
Authors
Thomas C. Michot, A.J. Nault

Nesting habitat of Belding’s Savannah sparrows in coastal salt marshes Nesting habitat of Belding’s Savannah sparrows in coastal salt marshes

Although the Belding’s Savannah sparrow (Passerculus sandwichensis beldingl) is listed as endangered in California, little is known about the factors that affect its abundance and distribution. Numbers of breeding pairs, nesting territory sizes, and vegetation characteristics were measured at fourteen study plots in two southern California coastal wetlands, Tijuana Estuary and Los...
Authors
Abby Powell
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