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Filter Total Items: 3509

Biomass patterns in seagrass meadows of the Laguna Madre, Texas Biomass patterns in seagrass meadows of the Laguna Madre, Texas

The Laguna Madre of Texas supports the most extensive seagrass meadows in the western Gulf of Mexico, In 1988 seagrasses covered 730 km2 or about three-quarters of the embayment. Halodule wrightii dominated the entire upper laguna, and total biomass was quite uniform near 160 g˙m-2 throughout. Four species shared dominance in the lower laguna. Where present mean biomass of Thalassia...
Authors
Christopher P. Onuf

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
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