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Now showing items 556-575 of 850

Natal source contributions of Pacific cod (Gadus macrocephalus) recruits in the southeastern Bering Sea

DiMaria, Ruth A. (2011-07-14)

Effective and sustainable fisheries management not only depends on identifying and defining stocks (fundamental unit of management), but also on having knowledge of factors influencing the abundance, distribution and con ...
Natality of black-tailed deer in McDonald State Forest

Jordan, Jack William (1973-01-09)

Natality of black-tailed deer in McDonald State Forest was determined by examination of 147 reproductive tracts. Yearlings collected from November of 1968 to May of 1970 had an average of 0.79 corpora lutea per doe, and ...
Natural-Channel-Design Restorations That Changed Geomorphology Have Little Effect on Macroinvertebrate Communities in Headwater Streams

Ernst, Anne G.; Warren, Dana R.; Baldigo, Barry P. (John Wiley & Sons, Inc., 2012-07)

Stream restorations that increase geomorphic stability can improve habitat quality, which should benefit selected species and local aquatic ecosystems. This assumption is often used to define primary restoration goals; y ...
Neritic reef fishes off central Oregon : aspects of life histories and the recreational fishery

McClure, Robert Edward (1982-03-16)

Recreational angling pressure has recently increased in the neritic reef areas off the central Oregon coast. This study describes weight-length and age-length relationships as well as ages at sexual maturity of the bl ...
Nest box selection of wood ducks as influenced by color and site factors

Morse, Thomas Earl (1968-08-29)

Selection of colored nest boxes by wood ducks (Aix sponsa) was evaluated during the breeding seasons of 1967-68 in Benton County, Oregon. No color or site factor influence was observed in 1967 when nest boxes were ere ...
Nest Success and Cause-Specific Nest Failure of Grassland Passerines Breeding in Prairie Grazed by Livestock

Johnson, Tracey N.; Kennedy, Patricia L.; Etterson, Matthew A. (John Wiley & Sons, Inc., 2012-11)

Livestock grazing is a widespread source of habitat modification, and may affect populations of ground-nesting grassland birds by influencing rates of nest failure. Nesting attempts can fail for various reasons, and dete ...
Nest-site selection in cooperatively breeding Pohnpei Micronesian Kingfishers (Halcyon cinnamomina reichenbachii) : does nest-site abundance limit reproductive opportunities?

Kesler, Dylan C. (2002-03-12)

Despite their inherent importance and utility as ecological examples, island species are among the most endangered and least studied groups. Guam Micronesian Kingfishers (Halcyon cinnamomina cinnamomina) exemplify the ...
Nesting and foraging ecology of band-tailed pigeons in western Oregon

Leonard, Jerome Patrick (1988-02-27)

Pacific Coast band-tailed pigeons (Columba fasciata) have declined markedly during the past several decades. Despite implementation of increasingly restrictive hunting regulations, populations have shown minimal signs ...
Nesting ecology of mallards in the Willamette Valley of Oregon

Rickerson, Eric V. (2001-07-23)

Although widely studied in many portions of North America, little is known about the specific habitat requirements of mallard ducks (Anas platyrhynchos) during the breeding season in western Oregon. I radio-marked 72 f ...
Nesting habitat and ecology of Aleutian terns on the Copper River Delta, Alaska

Holtan, Lars H. (1980-02-28)
Nesting season ecology of marbled murrelets at a remote mainland fjord in southeast Alaska

Barbaree, Blake A. (2011-06-20)

This thesis focuses on the nesting ecology and marine space use of Marbled Murrelets (Brachyramphus marmoratus) during the 2007 and 2008 nesting seasons in and around Port Snettisham, a remote mainland fjord in Southeast ...
Net production of juvenile steelhead, Salmo gairdneri Richardson, in a freshwater impoundment

Coche, Andre Georges (1964-08-14)
Net production, movement, and food of cutthroat trout (Salmo clarki clarki Richardson) in three Oregon coastal streams

Lowry, Gerald Roger (1964-02-14)

Unfished populations of cutthroat trout in three small coastal streams in Oregon were studied from April of 1962 until November of 1963. Population size, growth rate, and net production were estimated for study areas ...
Neuromuscular pharmacology and [¹²⁵I]-α-bungarotoxin binding characteristics of the pectoral muscle of the buffalo sculpin (Enophrys bison)

Gant, Daniel B. (1982-04-02)
New species of Cyphocharax (Ostariophysi: Characiformes: Curimatidae) from Suriname and French Guiana and a discussion of curimatid diversity on the Guiana Shield

Vari, Richard P.; Sidlauskas, Brian L.; Le Bail, Pierre-Yves (Societe Francaise D'Ichtyologie, 2012-03-31)

Cyphocharax biocellatus, a species of curimatid characiform apparently endemic to the Marowijne River/Fleuve Maroni system in Suriname and French Guiana, and the Maim River basin in French Guiana is described as new. The ...
Nighttime foraging by deep diving echolocating odontocetes off the Hawaiian islands of Kauai and Ni’ihau as determined by passive acoustic monitors

Au, Whitlow W. L.; Giorli, Giacomo; Chen, Jessica; Copeland, Adrienne; Lammers, Marc; Richlen, Michael; Jarvis, Susan; Morrissey, Ronald; Moretti, David; Klinck, Holger (Acoustical Society of America, 2013-05)

Remote autonomous ecological acoustic recorders (EARs) were deployed in deep waters at five locations around the island of Kauai and one in waters off Ni'ihau in the main Hawaiian island chain. The EARs were moored to th ...
Nile tilapia (Oreochromis niloticus) production in tropical microcosms fertilized with rabbit excreta

Franco, Luis (1991-09-27)

This investigation explored the use of microcosms as a tool for studying the dynamics of tropical aquaculture ponds. The potential use of rabbit excreta as a pond fertilizer in integrated farming systems was also inve ...
Nocturnal activities of the Columbian black-tailed deer, Odocoileus hemionus columbianus Richardson, affecting spotlight census results in the Oregon Coast Range

Anderson, Carl Frederick (1959-05-13)
Non-wadeable river bioassessment: spatial variation of benthic diatom assemblages in Pacific Northwest rivers, USA

Pan, Yangdong; Hughes, Robert M.; Herlihy, Alan T.; Kaufmann, Philip R. (Springer, 2012-03)

Current bioassessment efforts are focused on small wadeable streams, at least partly because assessing ecological conditions in non-wadeable large rivers poses many additional challenges. In this study, we sampled 20 sit ...
Northern fur seal reproductive rates and early maternal care

Kunisch, E. (Erin) (2011-06-07)

The majority of the world's breeding population of northern fur seals (Callorhinus ursinus) is found on the Pribilof Islands (St. Paul and St. George) in the Bering Sea, Alaska. Pup production on these islands experienc ...