Publications
These publications showcase the significant science conducted in our Science Centers.
Filter Total Items: 16784
Sublethal effects of chronic lead ingestion in mallard ducks
Mallard drakes (Anas platyrhynchos) fed 1, 5, or 25 ppm lead nitrate were bled and sacrificed at 3‐wk intervals. No mortality occurred, and the pathologic lesions usually associated with lead poisoning were not found. Changes in hematocrit and hemoglobin concentration did not occur. After 3 wk ducks fed 25 ppm lead exhibited a 40% inhibition of blood δ‐aminolevulinic acid dehydratase activity that
Authors
M. T. Finley, M. P. Dieter, L. N. Locke
Geological and geochemical significance of Red Sea evaporites
No abstract available.
Authors
Frank T. Manheim
Optimal exploitation strategies for an animal population in a Markovian environment: A theory and an example
Optimal exploitation strategies were studied for an animal population in a Markovian (stochastic, serially correlated) environment. This is a general case and encompasses a number of important special cases as simplifications. Extensive empirical data on the Mallard (Anas platyrhynchos) were used as an example of general theory. The number of small ponds on the central breeding grounds was used as
Authors
David R. Anderson
The scientific referee
In the May 1973 issue of EOS, I criticized tendencies in earth science periodicals to discourage referee anonymity. I stressed that exposing referees to unnecessary personal and subjective influences tended to degrade standards of quality and promoted cliques, fragmentation, superspecialization, and proliferation of scientific literature. Generally speaking, division of opinion on this question, b
Authors
Frank T. Manheim
Maximum stages and discharges of small streams in Indiana
No abstract available.
Authors
L.G. Davis, R.G. Horner
Status of the wolf in Michigan, 1973
Wolf (Canis lupus) numbers in Michigan's Upper Peninsula declined from an estimated 45-50 animals in the mid-1950s to near extinction in 1973, probably because of overharvesting through the bounty system. Sporadic breeding and occasional immigration of wolves from Ontario and Minnesota are postulated to be the factors tending to maintain the present population at the level of perhaps six individua
Authors
J. Hendrickson, W. L. Robinson
Analysis of tissues of mallard ducks fed two phthalate esters
No abstract available.
Authors
A. A. Belisle, W. L. Reichel, J. W. Spann
The brown pelican and certain environmental pollutants in Louisiana
No abstract available.
Authors
L. J. Blus, T. Joanen, A. A. Belisle, R. M. Prouty
Effects of methylmercury on approach and avoidance behavior of mallard ducklings
Mallard ducks were fed a control diet or a diet containing 0.5 or 3 ppm mercury (as methylmercury dicyandiamide) based on the dry feed. These mercury diets are approximately equivalent to 0.1 and 0.6 ppm mercury in a natural succulent diet. I measured for the ducklings the approach behavior in response to a tape-recorded maternal call and the avoidance of a frightening stimulus....There were no si
Authors
G. H. Heinz
DDD poisoning in a loon and the identification of the hydroxylated form of DDD
No abstract available.
Authors
R. M. Prouty, J.E. Peterson, L. N. Locke, B. M. Mulhern
Sources of suspended matter in waters of the Middle Atlantic Bight
Suspended matter collected in the Middle Atlantic Bight (the coastal segment of the United States between Cape Cod and Cape Hatteras) in September 1969 was predominantly organic: an average of 80% combustible organic matter in surface waters and 40)% near bottom. Total suspended concentrations decreased between the inner shelf and the shelf break by an order of magnitude in both near-surface and n
Authors
Robert H. Meade, Peter L. Sachs, Frank T. Manheim, J. C. Hathaway, Derek Spencer
Cholinesterase (ChE) response and related mortality among birds fed ChE inhibitors
Patterns of mortality and inhibition of brain and plasma ChE in birds treated with ChE inhibitors were studied in an attempt to determine the validity of using ChE activity as a monitoring and diagnostic technique. Analysis of brain ChE activity proved to be reliable for diagnosing and monitoring effects of selected ChE inhibitors in birds. Brain ChE inhibition exceeding 20% indicated exposure, an
Authors
J. Larry Ludke, Elwood F. Hill, Michael P. Dieter