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Browsing Department of Fisheries and Wildlife by Title

Now showing items 174-193 of 839

Early development of the endocrine system in salmonids : regulation of sex differentiation and ontogeny of the stress response

Floyd, Donald J. (2000-11-30)

Sex steroids, follicle stimulating hormone (FSH), luteinizing hormone (LH) and gonadotropin releasing hormone (GnRH) were measured in monosex and mixed sex populations of rainbow trout during early development. Steroi ...
Eastern mosquitofish resists invasion by nonindigenous poeciliids through agonistic behaviors

Thompson, Kevin A.; Hill, Jeffrey E.; Nico, Leo G. (Springer, 2012-07)

Florida is a hotspot for nonindigenous fishes with over 30 species established, although few of these are small-bodied species. One hypothesis for this pattern is that biotic resistance of native species is reducing the ...
The ecological and cultural importance of a species at risk of extinction, Pacific lamprey

Close, David A.; Fitzpatrick, Martin S.; Li, Hiram W. (American Fisheries Society, 2002-07)

The cultural and ecological values of Pacific lamprey (Lampetra tridentata) have not been understood by Euro-Americans and thus their great decline has almost gone unnoticed except by Native Americans, who elevated the ...
Ecological aspects of the valley quail in the Madras area of central Oregon

Yadon, Vernal Lee (1954-05-14)
Ecological characteristics of montane floodplain plant communities in the Upper Grande Ronde basin, Oregon

Otting, Nicholas J. (1998-04-30)
Ecological effects of nitrogen and sulfur air pollution in the US: what do we know?

Greaver, Tara L.; Sullivan, Timothy J.; Herrick, Jeffrey D.; Barber, Mary C.; Baron, Jill S.; Cosby, Bernard J.; Deerhake, Marion E.; Dennis, Robin L.; Dubois, Jean-Jacques B.; Goodale, Christine L.; Herlihy, Alan T.; Lawrence, Gregory B.; Liu, Lingli; Lynch, Jason A.; Novak, Kristopher J. (The Ecological Society of America, 2012-09)

Four decades after the passage of the US Clean Air Act, air-quality standards are set to protect ecosystems from damage caused by gas-phase nitrogen (N) and sulfur (S) compounds, but not from the deposition of these air ...
Ecological influence of bacterial kidney disease on juvenile spring chinook salmon : effects on predator avoidance ability, smoltification, and physiological responses to stress

Mesa, Matthew G. (1999-01-28)

Juvenile chinook salmon (Oncorhynchus tshawytscha) were experimentally infected with Renibacterium salmoninarum (Rs), the causative agent of bacterial kidney disease (BKD), to investigate the effects of BKD on three aspe ...
Ecological relation of sympatric steelhead and resident rainbow trout in the Deschutes River, Oregon

Zimmerman, Christian E. (2000-05-05)

Sympatric steelhead and resident rainbow trout (Oncorhynchus mykiss) are known to exist in many rivers throughout the Pacific Rim. Whether sympatric steelhead and resident rainbow trout are polymorphisms within a singl ...
An ecological study of the Columbian black-tailed deer in a logged environment

McCullough, Dale R., 1933- (1960-04-11)
Ecology and behavior of bison in the Henry Mountains, Utah

Van Vuren, Dirk (1979-08-13)

Aspects of bison ecology and behavior were studied in the Henry Mountains, Utah during summer 1977 and summer 1978. Foraging distributions of bison and of cattle were compared to elevation, slope, horizontal distance ...
Ecology and decline of a rare western minnow : the Oregon chub (Oregonichthys crameri)

Pearsons, Todd N. (1989-01-17)

Once historically widespread throughout the Willamette and Umpqua River drainages, the Willamette Oregon chub is now restricted to scattered populations along 15 miles of the Middle Fork of the Willamette River wherea ...
Ecology of breeding burrowing owls in the Columbia Basin, Oregon

Green, Gregory A. (1983-03-07)
Ecology of female northern pintails during winter in the San Joaquin Valley, California

Fleskes, Joseph P. (1999-11-19)

I radio-tagged 191 Hatch-Year (HY) and After-Hatch-Year (AHY) female northern pintails (Anas acuta) in the San Joaquin Valley (SJV), California and studied their movements, habitat use and survival during August March, 1 ...
Ecology of mallard ducklings on Lower Klamath National Wildlife Refuge, California

Mauser, David M. (1991-12-09)

The ecology of female mallards (Anas platyrhynchos) and their broods was studied during 1988-90 on Lower Klamath National Wildlife Refuge, California. Survival of 127 radio-marked ducklings from 64 broods was 0.18 to ...
Ecology of populations of Van Dyke's salamanders in the Cascade Range of Washington State

McIntyre, Aimee P. (2003-11-18)

The Van Dyke's salamander (Plethodon vandyke,) is a rare species endemic to Washington State. It has been found in cool moist microhabitats along streams, splash zones of waterfalls, and headwater seeps. We explored th ...
The ecology of the olive ridley turtle (Lepidochelys olivacea) in the eastern tropical Pacific Ocean during the breeding/nesting season

Beavers, Sallie Christian (1996-05-10)
Ecology of the striped seaperch, Embiotoca lateralis, in Yaquina Bay, Oregon

Gnose, Charles E. (1967-11-14)
Ecology of underyearling summer steelhead trout in intermittent streams tributary to the Rogue River, Oregon

Faudskar, John David (1980-02-19)
Ecology of woody riparian vegetation in tributaries of the Upper Grande Ronde River basin, Oregon

Lytjen, Danna J. (1998-06-10)

Two studies on Catherine Creek and Meadow Creek of the Upper Grande Ronde River basin, quantified several physical and biotic influences on woody riparian community composition and structure. The Catherine Creek study ...
Effect of adult aquatic insect life history on return to Lookout Creek, H. J. Andrews Experimental Forest, Oregon

Farrand, Alexander Mark (2004-06-04)