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Fingerling channel catfish, Ictalurus punctatus, were fed one of three diets: one deficient in vitamin C (ascorbic acid), one deficient in vitamin D3 (cholecalciferol), or one containing both vitamins. Semimonthly from May to September and monthly from September to February, calcium and phosphorus were determined in eviscerated bodies and fat-free...

To the seamen of the 18th century who skirted its ice-choked seas in their wooden vessels, Antarctica was known as "Terra Australis Incognito" - the unknown land of the south....

Passage of the Coastal Zone Management Act of 1972 focused attention on the Nation's coastal land and water areas. As plans for more effective management of the coastal zone evolved, it soon became apparent that improved maps and charts of these areas were needed. This handbook was prepared with the...

In this issue we cover several interesting topics, including a report on the NCIC/Special Libraries Association meeting in Denver, the launching of a third Landsat satellite with a new thermal band, and the formation of a new California map society....

As our Nation's resources are developed, water will play an increasingly important role, both as a resource to be developed and as a resource to be protected. The proper development and protection of our water resources, however, will depend on adequate data on the quantity and quality of our water....

This report has been prepared in order to identify the NAWDEX Data Systems and their respective documentation. It discusses the operation of the systems as well as tools that have been developed to enhance or facilitate their use....

Fiscal 1977 marked the 98th year the U.S. Geological Survey has endeavored in the unceasing task of providing information about the Earth and its physical resources, and regulating the activities of lessees engaged in extracting petroleum and other minerals from the public domain. The past year also marked the beginning...

Two simple, rapid, sensitive methods were developed for determining the concentration of the lampricide 2',5-dichloro-4'-nitrosalicylanilide (Bayer 73) in stream water. Bayer 73 was extracted from acidified water samples with chloroform and then hydrolyzed to 2-chloro-4-nitroaniline (CNA) with either acid or base. The CNA was diazotized with sodium nitrite, and an...

A review was made of published and unpublished studies on nutritional requirements, diets, and feeding of selected coolwater species of fishes: yellow perch (Perca flavescens), European perch (P. fluviatilis), walleye (Stizostedion vitreum), smallmouth bass (Micropterus dolomieui), northern pike (Esox lucius), muskellunge (E. masquinongy), and the northern pike x muskellunge hybrid. The published information...

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Pesticide residues in wings of adult woodcock (Philohela minor) were used to monitor regional differences in a 1970-71 survey of DDT, DDE, TDE, dieldrin, mirex, and PCBs in Maine, New Hampshire, New York, New Jersey, Pennsylvania, North Carolina, South Carolina, Georgia, Lousiana, Michigan, and Wisconsin. In 1971-72, wings were sampled...

1. The exponential removal of ICG from the plasma by the mallard duck liver made possible the measurement of fractional dye clearance (K), plasma volume (PV) and plasma clearance (PC).2. Values obtained for K (14.9%/min), PV (39.2 ml/kg) and PC (5.8 ml/min per kg) agreed with those obtained by other...

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Because of the change in regional boundaries, Region V now includes Piedmont and Coastal Plains areas of the southeastern states from Maryland to the Gulf of Mexico, bordered on the west by Interstate Rt. 81 and US Rt. 220. Maryland's mountain stations are now reporting through Region IV (NASS 2:184-187)....

Eggs of barn owls (Tyto alba) were collected from 18 nests in offshore duck blinds on the Maryland side of the lower Potomac River estuary in 1972 and 1973 and analyzed for organochlorine residues. DDE was found in 100% of the clutches, PCBs in 89%, and dieldrin in 78%. Eggshell...