Publications
Below is a list of WERC's peer-reviewed publications. If you are searching for a specific publication and cannot find it in this list, please contact werc_web@usgs.gov
Filter Total Items: 3784
Utilization of Skylab (EREP) system for appraising changes in continental migratory bird habitat Utilization of Skylab (EREP) system for appraising changes in continental migratory bird habitat
The author has identified the following significant results. Surface water statistics using data obtained by supporting aircraft were generated. Signature extraction and refinement preliminary to wetland and associated upland vegetation recognition were accomplished, using a selected portion of the aircraft data. Final classification mapping and analysis of surface water trends will be
Authors
E.A. Work, D.S. Gilmer
Metabolism and thermoregulation in the sea otter Metabolism and thermoregulation in the sea otter
No abstract available.
Authors
P. Morrison, M. Rosenman, J. A. Estes
Longevity of nonsprouting Ceanothus Longevity of nonsprouting Ceanothus
Evidence is presented indicating species of Ceanothus in the subgenus Cerastes are generally longer-lived than species in the subgenus Euceanothus. It is proposed that this is due, at least in part, to the unique stem morphology of the former. The stems of these plants have a ribbed appearance which arises when branches die. This longitudinal channeling results in less nonphotosynthetic...
Authors
Jon E. Keeley
Productivity and flowering of winter ephemerals in relation to Sonoran Desert shrubs Productivity and flowering of winter ephemerals in relation to Sonoran Desert shrubs
Ephemeral plant biomass and density on a Sonoran Desert hill near Cave Creek, Arizona, vary relative to shrub canopy type and shrub density. Higher shrub density associated with increased elevation appears to decrease both ephemeral biomass productivity and density, while ephemeral growth is enhanced under a shrub canopy if it is not too dense or low-hanging. Phenology of ephemerals on...
Authors
William L. Halvorson, Duncan T. Patten
Growth of the desert tortoise (Gopherus agassizi) in Nevada Growth of the desert tortoise (Gopherus agassizi) in Nevada
No abstract available.
Authors
P.A. Medica, R.B. Bury, F.B. Turner
Behavioral interactions in North American treefrogs (Hylidae) Behavioral interactions in North American treefrogs (Hylidae)
No abstract available.
Authors
Gary M. Fellers
A comparison of observer and camera counts of desert bighorn sheep A comparison of observer and camera counts of desert bighorn sheep
No abstract available at this time
Authors
C. L. Douglas
An evaluation of attempts to reestablish sea otters in Oregon An evaluation of attempts to reestablish sea otters in Oregon
No abstract available at this time
Authors
R.J. Jameson
Saline Salt Marshes of Rhode Island Saline Salt Marshes of Rhode Island
No abstract available at this time
Authors
W. L. Halvorson, W.E. Gardiner
Sea otters: Their role in structuring nearshore communities Sea otters: Their role in structuring nearshore communities
A comparison of western Aleutian Islands with and without sea otter populations shows that this species is important in determining littoral and sublittoral community structure. Sea otters control herbivorous invertebrate populations. Removal of sea otters causes increased herbivory and ultimately results in the destruction of macrophyte associations. The observations suggest that sea...
Authors
J. A. Estes, J. F. Palmisano
Growth responses of Spartina patens and Spartina alterniflora by means of a two dimensional factorial design Growth responses of Spartina patens and Spartina alterniflora by means of a two dimensional factorial design
Growth of Spartina patens and Spartina alterniflora was compared under identical greenhouse conditions. Mature plants were grown in quartz sand and watered with the following solutions: (1) full Hoagland's solution; (2) Hoagland's minus iron; (3) Hoagland's minus nitrogen; (4) Hoagland's with NaCl added to 28 o/oo; (5) sea water of 28 o/oo. S. patens showed improved growth in Hoagland's...
Authors
W. L. Halvorson, A. C. Singer
Studies of reptiles in Rock Valley Studies of reptiles in Rock Valley
No abstract available at this time
Authors
P.A. Medica, D.D. Smith