Publications
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Denitrification in a South Louisiana wetland forest receiving treated sewage effluent Denitrification in a South Louisiana wetland forest receiving treated sewage effluent
Although denitrification has the potential to reduce nitrate (NO3a??) pollution of surface waters, the quantification of denitrification rates is complex because it requires differentiation from other mechanisms and is highly variable in both space and time. This study first measured potential denitrification rates at a wetland forest site in south Louisiana before receipt of secondary...
Authors
R.G. Boustany, C.R. Crozier, J.M. Rybczyk, R.R. Twilley
Age determination in manatees using growth-layer-group counts in bone Age determination in manatees using growth-layer-group counts in bone
Growth layers were observed in histological preparations of bones of known-age, known minimum-age, and tetracycline-marked free-ranging and captive Florida manatees (Trichechus manatus latirostris), substantiating earlier preliminary findings of other studies. Detailed analysis of 17 new case histories showed that growth-layer group (GLG) counts in the periotic bone were consistent with...
Authors
M. Marmontel, T. J. O'Shea, H. I. Kochman, S.R. Humphrey
Environmental gradients and identification of wetlands in north-central Florida Environmental gradients and identification of wetlands in north-central Florida
Vegetation composition, soil morphology, and hydrology were characterized along wetland-to-upland gradients at six forested sites in north-central Florida to compare results of Federal wetland delineation methods with 3–5 yr of hydrologic data. Wetland and non-wetland identifications were supported by hydrology data in eight of nine plant communities. Lack of hydric soil indicators and...
Authors
M.M. Davis, S.W. Sprecher, J.S. Wakeley, G.R. Best
A 7 year record of above-ground net primary production in a southeastern Mexican mangrove forest A 7 year record of above-ground net primary production in a southeastern Mexican mangrove forest
Spatial and temporal variations in net above-ground primary production (NPP) and litter turnover rate were studied, from 1987 to 1993, in a mangrove forest bordering Laguna de Terminos, Mexico. NPP, the sum of total litter fall and wood production, was measured over the entire study period in three zones in a basin forest: zone I, where Rhizophora mangle (red mangrove) occurs but...
Authors
J.W. Day, Carlos Coronado-Molina, F. R. Vera-Herrera, R. Twilley, V. H. Rivera-Monroy, V. H. Alvarez-Guillen, Richard H. Day, William Conner
New records of fishes at Isla del Coco, Costa Rica New records of fishes at Isla del Coco, Costa Rica
Isla del Coco lies at 5 degrees 32'N latitude, 87 degrees 04'W longitude and is the sole peak of the Cocos Ridge exposed above sea level. This isolated island formed approximately 2 million years ago. It rises 575 m above the surface of the sea and covers 46 km2 (Castillo et aI., 1988). Five hundred km to the NNE is Costa Rica; 630 km SSW are the Galapagos Islands; 650 km to the E is...
Authors
V.H. Garrison
Mortality estimates of striped bass caught in Albemarle Sound and Roanoke River, North Carolina Mortality estimates of striped bass caught in Albemarle Sound and Roanoke River, North Carolina
A statistical analysis of the age composition of striped bass Morone saxatilis harvested in Albemarle Sound and the Roanoke River, North Carolina. indicated that in 1988–1992 the population experienced a relatively high rate of total mortality. Age-3 and older fish were estimated to have been fully vulnerable to fishing mortality and to have experienced a total instantaneous mortality...
Authors
Robert M. Dorazio
Technology transfer opportunities : new development : new protocol verifies sterility of newly hatched fish Technology transfer opportunities : new development : new protocol verifies sterility of newly hatched fish
U.S. Geological Survey's Biological Resources Disicipline scientists have developed a procedure that could save commercial producers of triploid grass carp between $2000 and $3000 per pond. Since 1983, triploid grass carp have been commercially available for managing aquatic weeds that can cause water quality problems, replace native plants, or impede recreational and commercial use of...
Authors
J.A. Jenkins
A sexing technique for California Gulls breeding at Bamforth Lake, Wyoming (Una tecnica para determinar sexos en larus californicus reproduciendose en el Lago Bamforth, Wyoming) A sexing technique for California Gulls breeding at Bamforth Lake, Wyoming (Una tecnica para determinar sexos en larus californicus reproduciendose en el Lago Bamforth, Wyoming)
We used morphological characteristics to determine the sex of California Gulls (Larus californicus) nesting at Bamforth Lake, Wyoming. Using univariate and multivariate techniques, we evaluated sexual dimorphism in five external measurements taken from 614 California Gulls: bill length, bill depth, head-bill length, tarsus length, and body mass. Males were significantly larger than...
Authors
Bruce H. Pugesek
Use of aerial survey and aerophotogrammetry methods in monitoring manatee populations. Florida Cooperative Fish and Wildlife Research Unit RWO No. 116 Final Report Use of aerial survey and aerophotogrammetry methods in monitoring manatee populations. Florida Cooperative Fish and Wildlife Research Unit RWO No. 116 Final Report
Abstract not supplied at this time
Authors
Karl E. Miller, B.B. Ackerman, L.W. Lefebvre, Kari B. Clifton
Breeding bird census: Planted cottonwood forest -inside levee Breeding bird census: Planted cottonwood forest -inside levee
No abstract available.
Authors
Daniel J. Twedt
Breeding bird census: Bottomland hardwood forest I-IV Breeding bird census: Bottomland hardwood forest I-IV
No abstract available.
Authors
Daniel J. Twedt