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: 41764
Effects of stocking density and water exchange rate on growth and survival of channel catfish Ictalurus punctatus (Rafinesque) in circular tanks
Channel catfish were cultured for 177 days in circular tanks containing 1.6 m3 of water at combinations of five stocking densities (90–720 fish/m3) and five water exchange rates (2.0–0.5 h per exchange). Net yield increased as stocking density increased up to 540 fish/m3 then declined at higher densities. Mean fish weight, feed conversion efficiency and survival all declined as stocking density in
Authors
Kenneth O. Allen
Aging tricolored blackbirds by cranial ossification
No abstract available.
Authors
R. W. DeHaven, F.T. Crase, M. R. Miller
Seasonal water potential changes in Sonoran Desert shrubs in relation to topography
Water potential in Sonoran Desert shrubs was recorded from September 1968 through September 1969. Special attention was paid to recording maximum and minimum potentials on a seasonal basis and diurnal fluctuations during the wettest and driest periods of the year. Franseria deltoidea developed the lowest potential (—85 bar) of the shrubs recorded and also showed the greatest degree of response to
Authors
William L. Halvorson, Duncan T. Patten
Geographic distribution: Masticophis bilineatus
No abstract available.
Authors
P.A. Medica, B.G. Maza
An unusual breeding aggregation of frogs, with notes on the ecology of Agalychnis spurrelli (Hylidae: Anura)
No abstract available.
Authors
N. J. Scott, A. Starrett
Internal dosimetry in small vertebrates resident in a fallout field
No abstract available.
Authors
R.K. Mullen, P.A. Medica
Sea otters: their role in structuring nearshore communities
No abstract available.
Authors
J. A. Estes, J. F. Palmisano
Geographic distribution: Eumeces gilberti arizonensis
No abstract available.
Authors
P.A. Medica, L.J. Vitt
Gas-liquid chromatographic determination of 3-trifluoromethyl-4-nitrophenol residues in fish
A procedure for the determination of 3-mftuormethyl-4-nitrophenol (TFM) in fish tissues is described. Homogenized tissues are extracted with hexane-ethyl ether; the extract is cleaned up by partitioning the TFM from the extracting solvent into O.IN NaOB, acidifying the aqueous solution, and partitioning again with hexaneethyl ether. The TFM is methylated with diazomethane and analyzed by gas-liqui
Authors
J. L. Allen, J.B. Sills
Removal and deactivation of antimycin using carbon and chlorine
Abstract has not been submitted
Authors
V. K. Dawson
Monitoring 2,4-D residues at Loxahatchee National Wildlife Refuge
Abstract has not been submitted
Authors
D.P. Schultz, E.W. Whitney