Publications
This list of publications includes peer-review journal articles, official USGS publications series, reports and more authored by scientists in the Ecosystems Mission Area. A database of all USGS publications, with advanced search features, can be accessed at the USGS Publications Warehouse.
Filter Total Items: 41763
Diatoms as food of larval sea lampreys in a small tributary of northern Lake Michigan
The food and food preferences of sea lamprey ammocoetes have not been investigated. The food of the larval American brook lamprey, Lampetra lamottei, in the Great Lakes region consisted mainly of diatoms and desmids according to Creaser and Hann. Schroll discussed the biology of feeding of ammocoetes of Lampetra planeri and Eudontomyzon danfordi in Europe. This report presents data on the availabi
Authors
Patrick J. Manion
Some oligochaetes from Lake Michigan
Twenty-six species of Tubificidae, 12 Naididae, and 1 Lumbriculidae were found in three regions of Lake Michigan- Green Bay, the southern end of the lake proper, and the harbor at Ludington, Michigan. One new naidid species is described. Methods of identification of some species are discussed and illustrated. The abundance of oligochaetes and distribution of certain species vary with depth and loc
Authors
Jarl K. Hiltunen
Biology of the freshwater drum in western Lake Erie
Information on the biology of the freshwater drum or sheepshead (Aplodinotus grunniens) was collected in Lake Erie during a fishery and limnological study made by the Bureau of Commercial Fisheries in 1957 and 1958. Growth of the sheepshead in 1958 was slower than in 1927, and slower than the growth in most other waters. Males and females grew at the same rate through the 4th year of life, but the
Authors
Thomas A. Edsall
Digital caliper
The large number of measurements needed to describe fully the characteristics of biological specimens and other objects has always been tedious and time consuming. The work can be done much more rapidly and with greater accuracy with a digital caliper recently developed by us. The digital caliper is a new electronic instrument built to measure objects precisely throughout the range of 0.1 mm to
Authors
Louella E. Cable
Molecular characteristics versus biological activity
The molecular characteristics of mononitrophenols containing halogens not only play a key role in their biological activity but provide a novel example of selective toxicity among vertebrate animals. It has been reported that efforts to control the parasitic sea lamprey in the Great Lakes are directed at present to the applications of a selective toxicant to streams inhabited by lamprey larvae.
Authors
Vernon C. Applegate, Manning A. Smith, Bennett R. Willeford
Environmental influence on the pattern of plant communities along the north rim of the Grand Canyon
No abstract available at this time
Authors
W. L. Halvorson
Development of terminal buds in pinyon pine and Douglas-fir trees
No abstract available at this time
Authors
C. L. Douglas
Parasites of North American freshwater fishes
No abstract available at this time
Authors
G. L. Hoffman
The breeding bird survey, 1966
A Breeding Bird Survey of a large section on North America was conducted during June 1966. Cooperators ran a total of 585 Survey routes in 26 eastern States and 4 Canadian Provinces. Future coverage of established routes will enable changes in the abundance of North American breeding birds to be measured. Routes are selected at random on the basis of one-degree blocks of latitude and longitude. Ea
Authors
Chandler S. Robbins, Willet T. Van Velzen
Comparison of three methods of sampling trout blood for measurements of hematocrit
Trout blood is frequently collected for hematocrit measurements by excising the caudal fin (Snieszko, 1960), but this technique is impractical if valuable fish are to be sampled or if repeated observations are desired. Schiffman (1959) and Snieszko (1960) collected blood from the dorsal aorta and the heart, but these methods are relatively slow and require the preparation of needles and syringes.
Authors
Erwin W. Steucke, Richard A. Schoettger
Low-temperature incubation using a water supply
Cell and tissue culture has been concerned primarily with homiothermic vertebrate cells which require incubation at about 37 C, and there is a great variety of incubators designed to maintain temperatures which are usually above ambient. The culture of poikilothermic vertebrate cells--and invertebrate, plant, and some microbial cells--can often be carried out at ambient temperatures, but for some
Authors
K. Wolf, M. C. Quimby