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The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
Browse more than 5,500 book chapters authored by our scientists over the past 100+ year history of the USGS and refine search by topic, location, year, and advanced search.
Filter Total Items: 6173
Subspecies composition of sandhill crane harvest in North Dakota, 1968-94 Subspecies composition of sandhill crane harvest in North Dakota, 1968-94
North Dakota is a major fall staging area for the Midcontinent Population of sandhill cranes (Grus canadensis), which is composed of three subspecies: the greater (G. c. tabida), Canadian (G. c. rowani), and lesser (G. c. canadensis). The number of cranes killed by hunters in North Dakota averaged 6,793 during 1990-94 seasons, ranking second highest among crane-hunting states. The...
Authors
W. L. Kendall, Douglas H. Johnson, S. C. Kohn
Survival and fates of staging juvenile, female mallards in the Vermont / Quebec border region Survival and fates of staging juvenile, female mallards in the Vermont / Quebec border region
We alternately marked 80 juvenile, female mallards (Anas platyrhynchos), half with transmitters and bands and half with only bands in 1990 and 1991. Survival of radio-marked ducks was monitored daily and then summarized weekly for the periods 31 August - 6 December, 1990 (weeks 5-18) and 11 September - 6 December, 1991) (weeks 6-18). The pattern of survival throughout the staging period...
Authors
J. R. Longcore, D.G. McAuley, C.M. Bunck
The Baltic Macoma: abundance and distribution of an important winter food of diving ducks in Chesapeake Bay The Baltic Macoma: abundance and distribution of an important winter food of diving ducks in Chesapeake Bay
Poor water quality and widespread depletion of wild celery (Vallisneria americana) and other submerged aquatic plants important as waterfowl foods has resulted in the continued dependence of canvasbacks (Aythya valisineria) on Baltic clams (Macoma balthica) as their primary winter food. Despite this dependence, no information exists regarding the distribution and abundance of Baltic...
Authors
Dennis G. Jorde, G.M. Haramis
The ecology of parasites in a salt marsh ecosystem The ecology of parasites in a salt marsh ecosystem
No abstract available at this time
Authors
K. D. Lafferty
The effect of disturbance on the reproduction and management of captive cranes The effect of disturbance on the reproduction and management of captive cranes
No abstract available.
Authors
C.M. Mirande, J. W. Carpenter, A.M. Burke
The effects of pollutants on wildlife The effects of pollutants on wildlife
In this chapter, selected sources of information which address the effects of pollutants on wildlife are reviewed. Although naturally occurring plant and animal toxins also affect wildlife, the focus of this review is xenobiotic toxicants. Xenobiotic substances are chemicals introduced into the environment in the form of pesticides, heavy metals, polychlorinated biphenyls (PCBs), and...
Authors
K.E. Wesenberg
The highest global concentrations and increased abundance of oceanic plastic debris in the North Pacific: Evidence from seabirds The highest global concentrations and increased abundance of oceanic plastic debris in the North Pacific: Evidence from seabirds
Plastic pollution has risen dramatically with an increase in production of plastic resin during the past few decades. Plastic production in the United States increased from 2.9 million tons in I960 to 47.9 million tons in 1985 (Society of the Plastics Industry 1986). This has been paralleled by a significant increase in the concentration of plastic particles in oceanic surface waters of...
Authors
Martin D. Robards, Patrick J. Gould
The name of Lawrence's flycatcher The name of Lawrence's flycatcher
If Lawrence's flycatcher of Grenada, Trinidad, and northern South America is placed in the genus Lathrotriccus with the species euleri, it should be L. flaviventris (Lawrence) or L. euleriflaviventris, depending on rank. If it remains in the genus Empidonax, the specific name should be bolivianus Allen.
Authors
R.C. Banks
The potential of fruiting trees for habitat enhancement The potential of fruiting trees for habitat enhancement
No abstract available.
Authors
M.S. Foster
The value of small preserves The value of small preserves
No abstract available at this time
Authors
M.W. Schwartz, P. van Mantgem
Use of ultralight aircraft for introducing migratory crane populations Use of ultralight aircraft for introducing migratory crane populations
Objectives were to determine if captive-reared cranes could be led behind an ultralight aircraft (UL) along a migration route and, if after release on a wintering area, they would integrate with wild cranes and migrate north in spring to their natal area without assistance. Greater sandhill cranes (Grus canadensis tabida) were used as the research surrogate for whooping cranes (Grus...
Authors
Kent R. Clegg, J. C. Lewis, D. H. Ellis