Wetland and Aquatic Research Center

Publications

Explore WARC's science publications.

Filter Total Items: 2,307
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Year Published: 1993

The examination of a competition matrix for transitivity and intransitive loops

Recent examinations of competition matrices for transitivity (species A > species B > species C) have used techniques that can be subject to certain biases. First, recent theoretical and empirical analyses have shown that traditional measures of competitive performance are biased in favor of the larger species. It is argued that this size...

Grace, James B.; Guntenspergen, Glenn R.; Keough, Janet R.

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Year Published: 1993

Survival of female canvasbacks wintering in coastal Louisiana

Annual survival probabilities of female canvasbacks (Aythya valisineria) are lower than those of males, but sources and timing of mortality are poorly understood. To further elucidate causes of reduced annual survival in female canvasbacks, we estimated survival rates for radio-tagged females in coastal Louisiana during winters 1988-91. Survival...

Hohman, William L.; Pritchert, Ronald D.; Moore, Joseph; Schaeffer, D.O.

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Year Published: 1993

Recent growth increases in old-growth longleaf pine

Longleaf pine (Pinuspalustris Mill.) tree-ring data were obtained from an old-growth stand located in Thomas County, Georgia. The tree-ring chronology from the pine stand is composed of a collection of cores extracted from 26 trees ranging in age from approximately 100 to 400 years. These cores were prepared, dated, and measured, and the...

West, D.C.; Doyle, T.W.; Tharp, M.L.; Beauchamp, J.J.; Platt, William J.; Downing, D.J.

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Year Published: 1993

A multifunctional decision support GIS for coastal management

No abstract available.

Ji, Wei; Mitchell, Loyd C.; McNiff, Marcia; Johnston, James B.

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Year Published: 1993

Natural resource problem solving: An interdisciplinary approach in coastal Louisiana

No abstract available.

Foote, A. Lee; Burkett, Virginia R.; Williams, S. Jeffress

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Year Published: 1993

Laguna madre: Seagrass changes continue decades after salinity reduction

Vegetation maps of the lower Laguna Madre prepared from surveys conducted in 1965–1967, 1974–1976, and 1988 document a >330 km2 decrease in cover byHalodule wrightii, an increase of almost 190 km2 in other seagrass species, and an increase of 140 km2 in bare bottom. Loss in seagrass cover is confined to deeper parts of the laguna...

Quammen, Millicent L.; Onuf, Christopher P.

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Year Published: 1993

Plant decomposition rates in two Louisiana coastal marshes

No abstract available.

Reynolds, Kathleen A.; Foote, A. Lee; Guntenspergen, Glenn R.

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Year Published: 1993

Body composition of wintering canvasbacks in Louisiana: Dominance and survival implications

I studied effects of sex, age, and month on body mass and composition of Canvasbacks (Aythya valisineria) at Catahoula Lake (CL) and the Mississippi River Delta (MRD), Louisiana, in winter 1987-1988. Size-adjusted body mass and fat varied by age, month, and site. Fat levels in immatures were greater at MRD than at CL, but changed similarly at both...

Hohman, William L.

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Year Published: 1993

Relative effects of nutrient enrichment and grazing on epiphyte-macrophyte (Zostera marina L.) dynamics

The independent and interactive effects of nutrient concentration and epiphyte grazers on epiphyte biomass and macrophyte growth and production were examined in Zostera marina L. (eelgrass) microcosms. Experiments were conducted during early summer, late summer, fall, and spring in a greenhouse on the York River estuary of Chesapeake Bay...

Neckles, Hilary A.; Wetzel, R. L.; Orth, R.J.

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Year Published: 1993

Sex ratios of canvasbacks wintering in Louisiana

 Disparate sex ratios in waterfowl are considered indicative of differential survival between the sexes and may limit reproductive potential. Because other studies have shown canvasbacks (Aythya valisineria) have highly skewed sex ratios, I examined aerial photographs from surveys flown monthly during winters 1987-88 and 1988-89 to determine...

Woolington, Dennis W.

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Year Published: 1993

1993 Annual summary: ENTERGY Lake Dardanelle fish and zebra mussel study

Abstract not supplied at this time

Stoeckel, J.N.; Gagen, C.J.; McCollum, D.O.; Beadel, R.K.; Herod, J.J.; Shook, S.D.
1993 Annual summary: ENTERGY Lake Dardanelle fish and zebra mussel study; 1993; Report; Stoeckel, J.N.; Gagen, C.J.; McCollum, D.O.; Beadel, R.K.; Herod, J.J.; Shook., S.D.