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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

The structure and function of hemocyanin from Cancer magister

Graham, Robert Allison January 1983 (has links)
xiii, 192 leaves : ill. ; 28 cm Notes Typescript Thesis (Ph. D.)--University of Oregon, 1983 Includes vita and abstract Bibliography: leaves 191-192 Another copy on microfilm is located in Archives
2

Salt and water balance in the Dungeness crab, Cancer magister Dana (Decapoda, Brachyura)

Hunter, Kenneth Charles, 1945- 09 1900 (has links)
Thesis (Ph.D.)--Oregon, Dept. of Biology Vita Bibliography: l. 135-144
3

Physical and kinetic properties of lactate dehydrogenase in the heart, leg and claw tissues of the Dungeness crab Cancer magister Dana

Holzinger, Robert Thomas, 1950- 06 1900 (has links)
Thesis (M.S.)--Oregon, Dept. of Biology Vita Bibliography: l. 54-59
4

Aspects of antennal gland function in the dungeness crab, Cancer magister (Decapoda, Brachyura)

Holliday, Charles Walter, 1946- 06 1900 (has links)
xiii, 233 leaves : ill. ; 29 cm, Typescript. (Another copy on microfilm is located in Archives) Thesis (Ph.D.)--University of Oregon Includes vita and abstract Bibliography: leaves 220-233 University of Oregon theses, Dept. of Biology, Ph.D., 1978
5

The Influence of Behavior and Hydrodynamics on the Dispersal of Dungeness Crab, Cancer magister, Larvae

Rasmuson, Leif 23 February 2016 (has links)
The Dungeness crab fishery is the most economically important on the West Coast; however, it has experienced dramatic fluctuations in annual catch. Previous research has shown the annual catch of megalopae is correlated with the commercial catch. The catch of megalopae is correlated with the phase of the Pacific Decadal Oscillation (PDO), the day of the year of the spring transition and the amount of upwelling following the spring transition. Further, the daily catch of megalopae is correlated with the internal tide. We developed individual based models of Dungeness crab dispersal, which we validated with results from a light trap. We demonstrated that the retention of larvae in the California Current is enhanced during negative phase PDOs. Further, we suggest that larvae migrate to or almost to the bottom each day. Specifically, megalopae exhibit a twilight vertical migration off of the continental shelf and remain in the neuston on the continental shelf. This concentrates megalopae at the continental shelf break. We also observed megalopae in situ and demonstrated that they swim in the neuston with the surface current at speeds of ~ 10 cm s-1. Using these results and data from a mooring, we demonstrated that this behavior would increase the distance internal waves would transport larvae. We analyzed mooring data and suggest that catch of megalopae is greater when the thermocline is deep and weak and there is less horizontal shear. We hypothesize this allows internal waves to remain coherent longer on the continental shelf. We show that the spring transition coincides with a shallowing of the thermocline, which would ultimately lead to the development of internal waves of depression rather than elevation. We hypothesize that the change in surface flow, based on whether the wave is one of elevation or depression, explains why most megalopae are caught following the spring transition. In general, these findings help us better understand the dispersal of Dungeness crabs. We suggest the dispersal patterns support Michael Sinclair’s member vagrant hypothesis. Further, we suggest these findings apply to many of the continental shelf species in the California Current. This dissertation includes both published and unpublished co-authored materials.
6

Larval Biology and Estuarine Ecology of the Nemertean Egg Predator Carcinonemertes errans on the Dungeness Crab, Cancer magister

Dunn, Paul Hayven, 1981- 09 1900 (has links)
xix, 166 p. : ill. / The nemertean worm Carcinonemertes errans is an egg predator on the Dungeness crab, Cancer magister, an important fishery species along the west coast of North America. This study examined the estuarine distribution and larval biology of C. errans. Parasite prevalence and mean intensity of C. errans infecting C. magister varied along an estuarine gradient in the Coos Bay, Oregon. Crabs nearest the ocean carried the heaviest parasite loads, and larger crabs were more heavily infected with worms. Seasonal infection patterns were seen at some sites within the bay. Crabs from coastal waters carried significantly more worms than did crabs from the bay, suggesting that the estuary may be acting as a parasite refuge for estuarine crabs. In laboratory experiments, C. errans all died in salinities below 10 within 6 days, but C. errans showed some tolerance to salinities 20 and above. These results suggest that salinity alone does not likely account for the estuarine gradient of C. errans in Coos Bay. Larvae of C. errans raised from hatching never settled in the laboratory. Competent larvae taken in plankton tows were morphologically distinct from larvae raised in laboratory cultures and did settle successfully on C. magister under laboratory conditions. Initial settlement was reversible within a 24-hour window. After 48 hours, a non-reversible metamorphosis occurred wherein worms lost one pair of eyes and the propensity to swim. In field settlement experiments, C. errans was capable of infecting hosts from the water column and preferred to settle on crabs already infected with juvenile worms, although this preference was density dependent. In monthly plankton tows, larvae of C. errans were found only between August and November, suggesting a long larval life for this species. Larvae did not feed under laboratory conditions, nor did they absorb dissolved organics. When exposed to a natural angular light distribution, larvae of C. errans were rarely photopositive. Larvae were most sensitive to blue-green light. Low intensity light invoked a photonegative response. Larvae were geopositive at hatching but geonegative thereafter. / Committee in charge: Brendan Bohannan, Chairperson; Craig Young, Advisor; Svetlana Maslakova, Member; Alan Shanks, Member; William Orr Outside, Member
7

The regional and depth distribution of Dungeness crab, <i>Cancer magister</i>, off the west coast of Washington state

Canright, Elizabeth 22 June 2022 (has links)
No description available.

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