OIMB Theses

Permanent URI for this collection

https://hdl.handle.net/1794/1044

This collection contains some of the theses and dissertations produced by students in the University of Oregon OIMB Graduate Program. Paper copies of these and other dissertations and theses are available through the UO Libraries.

Browse

Browsing OIMB Theses by Subject "Cancer Magister"

Now showing 1 - 2 of 2
  • Thumbnail Image
    ItemOpen Access
    THE LARVAE DYNAMICS OF CANCER MAGISTER IN THE COOS BAY ESTUARY
    (2022-07-06) Rowell, David
    The role of an estuary or bay in the life cycle of Cancer magister is not well understood. I believe Coos Bay, as well as other bays, is an important "nursery" ground for young crabs, its recruits are necessary for sustaining a commercial fishery. Tasto (1978) has shown that juveniles account for a larger percentage of an estuary's crab population than in nearshore waters. The juveniles in the S.F. Bay-complex exhibited a growth rate nearly twice that of ocean-reared crabs (Tasto et al 1981). It is postulated that this is due to reduced predation pressure and increased food supply within the estuary.
  • Thumbnail Image
    ItemOpen Access
    SOME ASPECTS OF THE ECOLOGY AND BIOLOGY OF TWO CANCER SPECIES
    (1980-12) Selby, Richard S.
    As a commercially exploited species the Dungeness Crab, Cancer magister, has generated a fairly large, unconsolidated body of literature. Initial research undertaken in British Columbia, Washington, Oregon and California dealt with general biology and the fishery, with the goal of determining the adequacy of fishery regulations. At that time no danger of overfishing was thought to exist, although fishery effort was intensifying (Cleaver 1949). A number of authors also noted a coastwide cycling in abundance of crab landings. However, after the 1960-1961 season the central California fishery did not recover from low levels of abundance associated with a cyclic minimum. Concern for this fishery prompted a new wave of investigations of population dynamics, making use of recent ecological theory, computer analysis and modeling techniques. The possibility that the fishery could alter natural population cycles, resulting in drastically lowered population levels throughout the species' range, was suggested. The purpose of this paper is critically to review the ecology and exploitation of magister using the information gathered throughout the last 60 years