From 1979 through 1984 the economic bases of rural
Oregon counties have undergone structural change. Nonwage
income, especially transfer payments, has played an
important role in these changes. Demographic changes in
rural counties have contributed to the growth in unearned
income.
The economic structure of rural Oregon counties was
estimated...
The Fishery Conservation and Management Act of 1976
took effect on March 1, 1977. By this Act the United
States extended its management over fisheries to 200
nautical miles from shore. Extended fishery jurisdiction
was expected to promote industry development and expand
the contribution of the fishing industry to the...
Policy decisions in fishery management are becoming increasingly
complex and difficult. This is especially true for the salmon fisheries
where policy outcomes affect the productivity of the salmon
resource and the subsequent well-being of commercial fishermen, charter
boat operators, Indian fishermen, and sport anglers. The objective
of this study was...
Growing demand for limited quantities of fish has led to systematic
planning for the conservation and management of U.S. fishery resources.
There is a need for better understanding of the complex biological and
social environment on which regulation for conservation, social, and
economic purposes is imposed. The behavior of commercial...
In the formulation of fisheries management plans required under the
Fisheries Conservation and Management Act of 1976 specific attention is
paid to the "capacity" of domestic fishing vessels to harvest the predetermined
optimum yield on an annual basis. Capacity is interpreted in
this thesis as the technical harvesting potential of...
In this thesis an introduction to simulation and object oriented programming discusses the need for the creation of several classes which directly support object oriented simulation. The author places no restrictions on the type of simulations that can be conducted and simulation practitioners will find that the classes provided lay...
The western North Atlantic population of the northern right whale (Eubalaena
glacialis) was severely depleted by whaling over the last century. Despite over fifty
years of protection, fewer than four hundred individuals are believed to exist in the
North Atlantic. Relatively little is known about the diving behavior, respiratory
physiology,...
Gray whales accomplish an annual migration which
spans as much as 50° of latitude in the northeast
Pacific Ocean. This migration links their summer high
latitude feeding grounds with winter calving and breeding
areas. The purpose of this study was to determine how
adult females apportion their stored lipid reserves...
Birth and pupping season records of Pacific harbor seals
(Phoca vitulina richardsi) were used in an analysis of
photoperiod effect on the timing of birth in this species. Dates
and latitudes of births were converted into photoperiods using a
photoperiod equation. Sequential dates from parturition were
converted into photoperiods and...
The ecology of the North Atlantic right whale (Eubalaena glacialis) was examined at three spatial scales during the summer and early fall on their northern feeding grounds. The diving and foraging behavior of right whales was investigated at spatial scales of hundreds to thousands of meters by tagging right whales...
The objectives of this dissertation were to describe the complex oceanographic conditions around the Galápagos Archipelago (eastern equatorial Pacific), their seasonal variability, and their effects on patterns of cetacean occurrence. The physical and ecological factors leading to a plume of high phytoplankton biomass in the wake of the Galápagos were...
Blue whales (Balaenoptera musculus) are the largest of the baleen
whales. Blue whale calls were recorded off the coast of California in fall,
1993 and measured for frequency and time characteristics. On average, blue
whale calls lasted 16 s, swept down from 18.9 to 17.3 Hz and were
repeated every...
Number of harbor seals, counted on 32 haul-out areas in Oregon, increased by 6 - 8.8 % per year from 1975 - 1983. Percent of seals in bays has increased an average 1.8%/year, from 47% in 1975 to 61% in 1983. Along the central Oregon coast, harbor seals were most...