Publications
These publications showcase the significant science conducted in our Science Centers.
Filter Total Items: 16784
Effects of external applications of No. 2 fuel oil on common eider eggs
Because eggs of marine birds may be exposed to oil adhering to the feathers of adult birds, a study was undertaken to determine the effects of oil contamination. Two hundred common eider eggs were divided into four experimental sets of 50 each. Two sets were treated with No. 2 fuel oil in amounts of 5 microliters to 20 microliters; a third with 20 microliters of propylene glycol, a neutral block
Authors
Robert C. Szaro, P.H. Albers
The chromosomes of the Didelphidae (Marsupialia) and their evolutionary significance
One hundred and seventy-seven specimens of American didelphids, representing 9 genera and 22 species have been studied for their chromosomal constitution. Didelphids are very conservative in chromosomal complements. All of the studied species can be sorted into one of three kinds of karyotypes: 2n= 14 (three species of Didelphis, one of Lutreolina, two of Philander, and one of Chironectes), 2n = 1
Authors
O. Reig, Alfred Gardner, N. O. Bianchi, James L. Patton
Interactions of nutrients, plant growth and herbivory in a mangrove ecosystem
The effect of nutrient enrichment of red mangroves (Rhizophora mangle) was studied by comparing two mangrove—covered islands in the Indian River at Ft. Pierce, Florida, USA, one (high nutrient) with and one (low nutrient) without a breeding colony of pelicans and egrets. Repeated measurements taken on > 100 tagged branches in each area revealed higher growth rates at the high nutrient site. Trees
Authors
Christopher P. Onuf, John M. Teal, Ivan Valiela
Water quality of the glacial-outwash aquifer in the Great Miami River Basin, Ohio
The present water-quality conditions of the highly productive glacial-outwash aquifer in the Great Miami River basin of southwestern Ohio are documented by analyses of water from 98 sampling sites. Localized high concentrations of iron up to 5600 micrograms per liter, ammonia nitrogren as nitrogen up to 11 milligrams per liter, nitrite plus nitrate nitrogen as nitrogen up to 9.8 milligrams per li
Authors
Kenneth F. Evans
Flow routing in the Susquehanna River Basin: Part I - Effects of Raystown Lake on the low-flow frequency characteristics of the Juniata and lower Susquehanna Rivers, Pennsylvania
A flow-routing model was used to simulate 17 water years of daily streamflows at five sites. The sites were Mapleton Depot and Newport, Pennsylvania, on the Juniata River, and Harrisburg and Marietta, Pennsylvania, and Conowingo, Maryland, on the Susquehanna River. The purpose for the simulations was to determine the effects of a new reservoir, Raystown Lake, on the low-flow frequency characterist
Authors
Jeffrey T. Armbruster
Time of travel of solutes in the Tuscarawas River Basin, Ohio, August and September, 1974
A time-of-travel study was made on a 10.6-mile reach of the Tuscarawas River to determine average velocity and dispersion characteristics between selected points. The reach was divided into five subreaches, and a fluorescent dye used as a tracer material. At about the 50-percent flow-duration level, time-of-travel of the peak concentration was 137 hours.
Authors
Arthur O. Westfall, Earl E. Webber
Time of travel of solutes in selected reaches of Ohio streams, 1973 and 1975
The basic field data for time-of-travel measurements on six streams in Ohio are presented. In general, additional data on stream cross sections, tributary inflows, and chemical analyses for mainstream and tributary flows are given. Insufficient data were obtained to establish time-distance or time-discharge relationships.
Authors
Arthur O. Westfall
Copepod parasites of freshwater fish: Ergasilus, Achtheres, and Salmincola
No abstract available at this time
Authors
G. L. Hoffman
Argulus, a branchiuran parasite of freshwater fishes
No abstract available at this time
Authors
G. L. Hoffman