Publications
These publications showcase the significant science conducted in our Science Centers.
Filter Total Items: 16795
Effects of extended photoperiod on sandhill crane reproduction
Photoperiod studies were conducted with greater sandhill cranes (Grus canadensis tabida) from 1969 to 1972 and from 1982 to 1987 at the Patuxent Wildlife Research Center, Maryland. When housed indoors and exposed to long photoperiods, males produced semen during winter. When exposed to artificially extended photoperiods during spring in outdoor pens, females apparently laid earlier in the year a
Authors
G.F. Gee, G.W. Pendleton
Sampling considerations involved with monitoring the nutritional status of gray wolves Canis lupus via biochemical analysis of snow-urine
No abstract available.
Authors
G. D. DelGiudice, J. Stone, L. D. Mech, U. S. Seal
Karyotype and identification of sex in two endangered crane species
A laboratory procedure for sex identification of monomorphic birds was developed using modern cytological methods of detecting chromosome abnormalities in human amniotic fluid samples. A pin feather is taken from a pre-fledging bird for tissue culture and karyotype analysis. Through this method, the sex was identified and the karyotype described of the whooping crane (Grus americana) and the Missi
Authors
C. Goodpasture, G. Seluja, G. Gee
Prevention of eastern equine encephalitis virus in captive cranes
No abstract available.
Authors
J. W. Carpenter, D.M. Watts, C.L. Crabbs, G.G. Clark, T.W. Scott, D. Docherty, B.B. Pagac, J.M. Dorothy, J.G. Olson, F. J. Dein
Characteristics of snowy plover (Charadrius alexandrinus) nest sites on agricultural drainwater evaporation ponds in the San Joaquin valley, California
No abstract available.
Authors
D. A. Barnum, W.L. Hohman, D.L. Roster
Use of agricultural drainwater impoundments by snowy plovers (Charadrius alexandrinus nivosus) in the southern San Joaquin valley, California
No abstract available.
Authors
D.L. Roster, W.L. Hohman, D. A. Barnum
Nutritional indices of wild mammals: a new direction for wildlife and habitat management systems
No abstract available.
Authors
G. D. DelGiudice, U. S. Seal, L. D. Mech
Comparison of neotropical migrant landbird populations wintering in tropical forest, isolated forest fragments, and agricultural habitats
Neotropical migrant bird populations were sampled at 76 sites in seven countries by using mist nets and point counts during a six-winter study. Populations in major agricultural habitats were compared with those in extensive forest and isolated forest fragments. Certain Neotropical migrants, such as the Northern Parula, American Redstart, and the Black-throated Blue, Magnolia, Black-and-white, and
Authors
C.S. Robbins, B.A. Dowell, D.K. Dawson, J.A. Colon, R. Estrada, A. Sutton, R. Sutton, Dieter Weyer
The study of relatedness and genetic diversity in cranes
The U.S. Fish and Wildlife Service (Service) is responsible for recovery of endangered species in the wild and, when necessary, maintenance in captivity. These programs provide an immediate measure of insurance against extinction. A prerequisite inherent in all of these programs is the preservation of enough genetic diversity to maintain a viable population and to maintain the capacity of the popu
Authors
G.F. Gee, H.C. Dessauer, J. Longmire, W.E. Briles, R.C. Simon
Peregrine falcons in Oregon and DDT in the Pacific Northwest
No abstract available.
Authors
C. J. Henny