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21 Titles Match Your Query
Showing 1 through 21 of 21
1. American Wildcelery (Vallisneria americana) Ecological Considerations for Restoration [usgsbrdnpwrcb00000016]
The success of vegetation management programs for waterfowl is dependent on knowing the physical and physiological requirements of the target species. Lakes and riverine impoundments that contain ...


2. An Assessment of Exotic Plant Species of Rocky Mountain National Park [usgsbrdnpwrcd0000001]
The invasion of exotic plants is becoming a problem in many ecosystems including some areas in Rocky Mountain National Park (RMNP) (Rocky Mountain National Park Resource Management Reports #1 and ...


3. Changes in Breeding Bird Populations in North Dakota: 1967 to 1992-93. [usgsbrdnpwrcd00000012]
Breeding bird populations in North Dakota were compared using surveys conducted in 1967 and 1992-93. In decreasing order, the five most frequently occurring species were Horned Lark (Eremophia alpestris), ...


4. Collecting and Analyzing Data from Duck Nesting Studies [usgsbrdnpwrcs0000004]
Northern Prairie has a long history of studying nest success of upland nesting ducks. Over the years, we have developed standardized procedures for collecting and analyzing these types of data. Data ...


5. Ecological Effects of Fire Retardant Chemicals and Fire Suppressant Foams [usgsbrdnpwrcd00000002]
Laboratory studies with algae, aquatic invertebrates, and fish. Short-term toxicity tests showed that both fire-retardant and foam-suppressant chemicals were very toxic to aquatic organisms including ...


6. Human Disturbances of Waterfowl: An Annotated Bibliography. [usgsbrdnpwrcd0000003]
The expansion of outdoor recreational activities has increased greatly the interaction between the public and waterfowl and waterfowl habitat. The effects of these interactions on waterfowl habitats ...


7. The Mallard Model [usgsbrdnpwrcd0000005]
Waterfowl managers face many difficult decisions about how to manage a particular area to maximize productivity of mallards (Anas platyrhynchos) and other upland nesting waterfowl. The Mallard Model ...


8. Birds Checklists of the United States [usgsbrdnpwrc_d_birds_checklists]
This resource is known as Bird Checklists of the United States. Bird Checklists of the United States. For years, people and groups have developed listings or checklists of birds that occur in a particular ...


9. Northeast Wetland Flora: Field Office Guide to Plant Species [usgsbrdnpwrc_d_newetlandflora]
This Field Guide was prepared by Biotic Consultants, Incorporated, of Carbondale, Illinois, under Contract #53-2D81-3-1. All descriptions have been written by Robert H. Mohlenbrock. Mark Mohlenbrock ...


10. A Checklist of Manitoba Spiders (Araneae) with Notes on Geographic Relationships [usgs_npwrc_manitobaspiders]
An annotated list of spider species is compiled from museum collections and several personal collections. This list includes 483 species in 20 families; 139 species are new provincial ...


11. Accuracy and Precision of Estimating Age of Gray Wolves by Tooth Wear [usgs_npwrc_graywolves]
We evaluated the accuracy and precision of tooth wear for aging gray wolves (Canis lupus) from Alaska, Minnesota, and Ontario based on 47 known-age or known-minimum-age skulls. Estimates of age using ...


12. Avian Use of Purple Loosestrife Dominated Habitat Relative to Other Vegetation Types in a Lake Huron Wetland Complex [usgs_npwrc_purpleloostrife]
Purple loosestrife (Lythrum salicaria), a native of Eurasia, is an introduced perennial plant in North American wetlands that displaces other wetland plants. Although not well studied, purple loosestrife ...


13. Incidental Catch of Marine Birds in the North Pacific High Seas Driftnet Fisheries in 1990. [usgs_npwrc_incidentalmarinecatc]
The incidental take of marine birds was estimated for the following North Pacific driftnet fisheries in 1990: Japanese squid, Japanese large-mesh, Korean squid, and Taiwanese squid and large-mesh ...


14. Influence of Age and Selected Environmental Factors on Reproductive Performance of Canvasbacks [usgs_npwrc_canvasbacks]
Age, productivity, and other factors affecting breeding performance of canvasbacks (Aythya valisineria) are poorly understood. Consequently, we tested whether reproductive performance of female canvasbacks ...


15. Lack of Reproduction in Muskoxen and Arctic Hares Caused by Early Winter [usgs_npwrc_muskoxen]
A lack of young muskoxen (Ovibos moschatus) and arctic hares (Lepus arcticus) in the Eureka area of Ellesmere Island, Northwest Territories (now Nunavut), Canada, was observed during summer ...


16. Assessing Breeding Populations of Ducks by Ground Counts. [usgs_npwrc_ducks]
Waterfowl inventories taken during the breeding season are recognized as a basic technique in assessing the number of ducks per unit area. That waterfowl censusing is still an inexact technology leading ...


17. Acute Toxicity of Fire-Control Chemicals, Nitrogenous Chemicals, and Surfactants to Rainbow Trout [usgs_npwrc_acutetoxicity]
Laboratory studies were conducted to determine the acute toxicity of three ammonia-based fire retardants (Fire-Trol LCA-F, Fire-Trol LCM-R, and Phos-Chek 259F), five surfactant-based fire-suppressant ...


18. Alpha Status, Dominance, and Division of Labor in Wolf Packs. [usgs_npwrc_alpha]
The prevailing view of a wolf (Canis lupus) pack is that of a group of individuals ever vying for dominance but held in check by the "alpha" pair, the alpha male and the alpha female. Most research ...


19. Importance of Individual Species of Predators on Nesting Success of Ducks in the Canadian Prairie Pothole Region [usgs_npwrc_nestingsuccess]
We followed 3094 upland nests of several species of ducks. Clutches in most nests were lost to predation. We related daily nest predation rates to indices of activity of eight egg-eating predators, ...


20. Leadership in Wolf, Canis lupus, Packs. [usgs_npwrc_canislupus]
L. David Mech examined leadership in Wolf (Canis lupus) packs based on published observations and data gathered during summers from 1986 to 1998 studying a free-ranging pack of Wolves on Ellesmere ...


21. A Bibliography of Fisheries Biology in North and South Dakota [usgsbrdnpwrcb00000013]
This bibliography lists as many fisheries biology and related references as possible from North Dakota and South Dakota waters for use by fishery biologists. Selected references from contiguous states ...


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