The overarching objective of this paper is to identify how the three tiers of human well-being (i.e., economics, ecosystems, and social) are linked to healthy landscapes and a species-rich ecosystem mediated by healthy cougar populations. Does the cougar help mitigate Oregon’s Lyme disease, chronic wasting disease (CWD), or elements of...
Zebrafish are capable of fully regenerating organs and tissue such as their caudal fin, which is similar to a human regrowing an arm or a leg. In contrast, most mammals including humans have a greatly reduced capacity for wound healing. The ability of zebrafish to undergo this regenerative process, called...
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RobertL. Tanguay
Zebrafish are capable of fully regenerating organs and tissue such as
Ubiquitous fine particulate matter (PM2.5) exposures significantly impact global public health, yet little is known about the mechanisms causing these known adverse health effects. Oxidative stress due to PM2.5 associated chemical constituents, such as polycyclic aromatic hydrocarbons (PAHs), is a proposed possible mechanism for PM2.5 mediated health effects. Variations in...
Nanoparticles (NPs), defined as materials having at least one dimension (height, width, diameter) in the nanoscale, are increasingly being incorporated into a wide variety of products and are replacing traditional bulk materials in many applications. This is because they can be more efficacious, more sustainable, and can have unique characteristics...
Since 2007, electronic cigarette (e-cigarette) sales in the U.S. have surpassed those of tobacco cigarettes. This is due, in part, to manufacturer’s claims that they are a safer alternative to tobacco cigarettes. However, formaldehyde, acrolein, and diacetyl have been detected in e-cigarettes and public knowledge of e-cigarette composition and potential...
The aryl hydrocarbon receptor (AHR) is a ligand activated transcription factor that is a member of the basic helix-loop-helix PER-ARNT-SIM (bHLH/PAS) protein family of cellular sensors. The AHR is conserved across multiple animal phyla and is required for proper vertebrate development. A structurally diverse group of chemicals, including polycyclic aromatic...
Polycyclic aromatic hydrocarbons (PAHs) are widespread environmental contaminants that occur in complex mixtures. These environmental mixtures can consist of both parent PAHs and their derivatives. Several parent PAHs are known or suspected mutagens and/or carcinogens, and a handful of PAH derivatives are known to be more potent mutagens and/or carcinogens...
Polycyclic aromatic hydrocarbons (PAHs) are among the most widely known and studied environmental contaminants, originating from a range of natural and anthropogenic sources. PAHs are known to occur in the environment as complex mixtures, containing both unsubstituted PAHs, as well as a range of PAH derivatives. Among the less-studied of...
There are more than 87,000 chemicals in current use with little to no toxicity information available. Assessing such a large number of chemicals using traditional methods would take an unreasonable amount of time and money, and require the use a large number of animals. The incorporation of high-throughput in vivo...
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RobertL. Tanguay
There are more than 87,000 chemicals in current use with little to no
Laboratories around the world are using the zebrafish model for biomedical research and conducting investigations using morphological, physiological, behavioral, and genomic endpoints. All assays provide information, but physiological and behavioral endpoints or phenotypes are a fast way to understand how an animal is responding to its environment. We investigate the...
The numerous different types of nanomaterials and paucity of reliable in vivo information on toxicity has resulted in enduring uncertainties associated with health and safety risks, thereby slowing progress in nanotherapeutic assessment and development. This dissertation explores how the embryonic zebrafish model can be applied to prioritize commonly used nanomaterial...
Polycyclic aromatic hydrocarbons (PAHs) and oxygen-substituted PAHs (OPAHs) are environmental contaminants present in urban air, dust, soil and water resulting from incomplete combustion of organic materials or fossil fuels; found in crude oil and coal; and formed through photoxidation or biotransformation of microbial. It is widely recognized that PAHs pose...
There has been a rapid increase in technological advances in the biological sciences that has contributed to an increase in societal issues that require attention from both scientists and citizens. Consequently, there is a need for the development of biologically literate citizens who have the ability to use their knowledge...
Firemaster 550 (FM550) is an additive flame retardant mixture used within polyurethane foam and is increasingly found in house dust and the environment due to leaching. In this study, we sought to investigate mono-substituted isopropylated triaryl phosphate (mITP), a major component of FM550, which has been shown to cause cardiotoxicity...
Polycyclic aromatic hydrocarbons (PAHs) are ubiquitous in the environment as components of fossil fuels and by-products of combustion. Defining toxicity mechanisms for this large family of multi-ring structures and substituted derivatives is a substantial challenge. Several PAHs, such as benzo(a)pyrene (BaP), are mutagenic, toxic to wildlife, and classified as probable...
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RobertL. Tanguay
Polycyclic aromatic hydrocarbons (PAHs) are ubiquitous in the
Billions of pounds of bisphenol A (BPA) are produced annually around the globe for the manufacture of numerous consumer products, including polycarbonate food and water containers, the protective resin linings of food cans, thermal printing paper, and dental fillings. BPA exposure during nervous system development has been associated with learning...
Incorporation of nanoparticles (NPs) into consumer products is on the rise and human exposure to NPs is unavoidable. Currently, there is insufficient data to assess the safety of nanoparticles. I conducted a series of five studies using the zebrafish model to determine which NP components (i.e., core material or surface...
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RobertL. Tanguay
Incorporation of nanoparticles (NPs) into consumer products is on the
rise
The complexity of numerical ocean circulation models requires careful checking with a variety of test problems. The purpose of this paper is to develop a test problem involving Rossby and gravity waves in a two-layer fluid in a channel. The goal is to compute very accurate solutions to this test...
Vitamin E was first described in 1922 as an unknown factor required for impregnated rats to carry their offspring to term. In fact, when vitamin E was chemically characterized it was given the name "tocopherol" derived from the Greek: tokos = childbirth; phero = to bear; and –ol, indicating an...
Understanding continental crust formation and modification is a fundamental and longstanding geologic problem. Influx of mantle-derived basaltic magma and partial melting of the crust are two ways to drive crustal differentiation. This process results in a low density upper crust and denser, more refractory lower crust, creating significant and vastly...
Numerous human conditions would be improved if therapies to encourage tissue regeneration were available. The goal of regenerative medicine is to encourage the body's intrinsic ability to repair and restore tissues lost by disease, injury or aging. While certain vertebrates have the inherent capacity to regenerate, mammals do not. To...
Fluorinated chemicals (FCs) have been used since the 1950s in many industrial and commercial applications because of their unique properties such as chemical inertness, resistance to heat and their ability to repel water and oils. Concerns regarding potential environmental or human health risk from FCs exposure have emerged due to...
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RobertL. Tanguay
Fluorinated chemicals (FCs) have been used since the 1950s in many
The emerging field of regenerative medicine is mainly approached by two different aspects. First is the use of stem cell based models to generate a suite of differentiated cells for therapeutic applications and the alternative approach is to utilize the non-mammalian models that have the inherent capacity to regenerate their...
Low reproductive success has been typical of high elevation populations of the Hawaiian goose (Branta sandvicensis) or nēnē. Researchers identified predation and inadequate nutrition as limiting factors. Reproductive success remained low in most years despite on-going predator control programs. I used a supplemental feeding program over two breeding seasons in...
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RobertL. Jarvis
Low reproductive success has been typical of high elevation populations
Dithiocarbamates are widely used agricultural pesticides, industrial chemicals and
effluent additives. DTCs and their related compounds have historical and current
relevance in clinical and experimental medicine. DTC developmental toxicity is well
established, but poorly understood. Dithiocarbamates according to the U.S. EPA have a
mechanism of action involving, "the inhibition of...
Invasion by nonnative brook trout (Salvelinus fontinalis) often results in replacement of bull trout (Salvelinus confluentus) in western North America, but the causal mechanisms are not well understood. Removal of brook trout from 1992 to 2000 from Sun Creek in southern Oregon, provided an opportunity to investigate the changes in...
I investigated the relationship between harlequin duck (Histrionicus histrionicus) behavior and lack of recovery from the Exxon Valdez oil spill in Prince William Sound, Alaska. First, I evaluated the hypothesis that harlequin ducks in winter have little flexibility to increase foraging time in response to disturbance because they are constrained...
Current riparian management objectives in the Pacific Northwest promote both retention of existing conifers and conversion of hardwood-dominated areas to conifers. Although understanding of relationships between riparian vegetation and salmonid prey availability is growing, temporal variation in these relationships is poorly understood. Seasonal fluxes in availability of aquatic and terrestrial...
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 female mallards in the Willamette Valley of Oregon in March-April 1995-96 to document wetland habitat selection during pre-nesting...
Freshwater wetlands in the Sacramento Valley provide breeding, wintering, foraging and stopover habitat for migratory and resident birds. With a loss of 95% of historic freshwater wetlands, the restoration of wetlands on private land could provide important habitat for birds. Documentation and monitoring of bird use on previously restored wetlands...
The 1989 Exxon Valdez oil spill was a major perturbation of nearshore habitats of Prince William Sound, a wintering area for harlequin ducks (Histrionicus histrionicus). This research was designed to evaluate harlequin duck population recovery from the oil spill from 1995 to 1998, using a demographic approach to assess both...
Well water levels and ditch flow were used to evaluate road-induced changes in surface and subsurface flow for two sites (Trocadero and Polk) in southeast Alaska. At the Trocadero Site, low water levels before and peak water levels during a storm were used to test for differences in subsurface water...
Evaporation was studied along the Middle Fork of the John Day River in northeastern Oregon. Evaporation pans and various meteorological sensors recorded data at nine sites during the summer of 1998; measurements were made at each site over a 3-4 day period. A Dalton-type evaporation model was produced using water...
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, 1991-94.
Overall, 94.3% wintered in central California; the highest percentage left during
the 1991 drought. Tulare Basin and Mendota...
My objectives were to: 1) develop a point count technique for estimating relative
abundance of band-tailed pigeons (Columbafasciata monilis), 2) determine the
availability, distribution, and interspersion of mineral sites, and nesting and foraging cover in relation to abundance of band-tailed pigeons in west-central Oregon, and 3) test the hypothesis that...
We sharpen our view of an eastern boundary current region during
the upwelling season through the analysis of several data sets.
We focus on the mesoscale flow field off of northern California,
observed during the Coastal Transition Zone (CTZ) experiment of 1988.
First, we estimate tidal currents in the region...
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 of recovery. I radio-marked
127 adult band-tailed pigeons in the central Oregon Coast Range in April-May of 1993-95
to document nesting chronology and productivity,...
Several types of channel morphology measurement parameters used to
characterize fish habitat of small streams are refined, developed and evaluated in terms
of their accuracy, precision, and sensitivity to disturbance. Data for 74 stream reaches
in Oregon and Alaska are used in analysis. Over half the reaches are from a...
Subsurface inputs into lotic systems are a primary mechanism for cooling streams with high ambient water temperatures. Objectives of this study include: 1) to determine the effectiveness of Forward Looking Infrared (FLIR) thermal imagery to detect shallow
aquifers, 2) to characterize certain physical, spatial, and temporal characteristics of the fluvial,...
This study was conducted to determine how the size and orientation of large
wood placed in streams in combination with peak flows, substrate and channel gradient
affect pool volume, surface area and maximum depth in two coastal Oregon streams.
Eighteen Douglas-fir (Pseudotsuga menziesii) logs were placed in each of two...
Diurnal time budgets and habitat use patterns of breeding Ugashik marbled godwits
(Limosa fedoa beringiae) were studied on the north-central portion of the Alaska Peninsula
during spring and summer 1995-1996. Marbled godwits were observed from blinds and
behaviors were described for the four phases of the breeding season: pair-formation, egg-laying,...
The specific habitat requirements of harlequin ducks (Histrionicus histrionicus
Linnaeus 1758), which breed in the Pacific Northwest, are largely unknown. I captured
and attached radio transmitters to 42 female harlequins (36 paired and 6 unpaired) in the
central Cascade Range of Oregon in 1994 and 1995. Breeding pairs used 3rd...
The Upper Sprague River Watershed (North and South Forks of the Sprague River) in south central Oregon provides important habitat for
salmonid species, including native bull trout (Salvelinus confluentus) and redband trout (Oncorhynchus mykiss ssp.). Concern over the loss of viable habitat for these species has increased due to reductions...
Object Watershed Link Simulation (OWLS) is a physically based watershed model. In the OWLS
model, a watershed is defined as a three-dimensional object with linkages between cells and their
attributes (e.g., area, slope, soil type, etc.). A cell is defined as the linkages of edges and their attributes
(e.g., length,...
The Upper Grande Ronde River Watershed in northeastern Oregon is considered important habitat for threatened stocks of chinook
salmon (Oncorhynchus tshawytscha). Documented reductions in channel complexity and riparian vegetation within the watershed have increased concern over loss of viable habitat. An important component of salmonid habitat is stream temperature during...
Through the trapping of sediment behind dams, the
presence of beaver in a watershed may cause substantial
changes to fluvial and geomorphic processes. In an
effort to investigate sedimentation patterns in beaver
ponds in the Oregon Coast Range, a case study was made of
the annual accumulation of sediment in...
Meyer's Canyon, a tributary of Bridge Creek in the John Day
Basin, is a deeply incised valley fill in northcentral Oregon. The
current channel is incised to the Cretaceous and Tertiary bedrock.
To determine the precedence of the current incision and the variation
and timing of depositional sequences, the sediments...
Breeding habitat of Harlequin ducks (Histrionicus
histrionicus) was studied in eastern Prince William Sound,
Alaska, during 1991 - 1993. Streams in Prince William
Sound were surveyed for Harlequin ducks and monitored with
mist nets. Physical characteristics of 24 Harlequin
breeding streams were compared to those of 24 streams not
used...
Chilling requirements of 43 apple and 38 pear cultivars
were estimated over a 2 year period by cutting shoots in the
field at weekly intervals and forcing them in a warm
greenhouse for 4 weeks. For apples, the mean values ranged
from 490 Chill Units (CU) +- 1 for 'Dorsett...
The habitat use, movements, and behavioral energetics
of unsuccessfully breeding female canvasbacks (Aythya
valisineria) were examined during the preflightless period
in southern Manitoba during 1989-90. Following breeding
attempts, unsuccessful females generally expanded their home
range on the breeding area, remained there for up to one
month, preferentially used large semipermanent...
Adult dusky Canada geese (Branta canadensis
occidentalis Baird) were banded with plastic neck bands and
observed on the winter range during 1985-92. Annual
survival rates of adult geese estimated from observation
data ranged from 76% to 85%. A model of Canada goose
population dynamics was developed to illustrate
relationships between...
Esmond Creek is a tributary to the Siuslaw River located in the Oregon Coast Range. It is 18 km in length and drains a watershed area is 48.9 km². Average channel gradient of the study reach is 0.9%. In 1988 a landslide
occurred in the Esmond Creek watershed involving approximately...
This study was designed and implemented to observe
the spatial and temporal dynamics of groundwater levels
and temperatures adjacent to a beaver pond in semi-arid
central Oregon. The study site was located on the eastern
boundary of Painted Hills National Monument along Bridge
Creek, a tributary to the John Day...
Many municipalities throughout western Oregon rely upon forested watersheds as a source for domestic water supply. These watersheds are commonly managed by state or
federal agencies or private corporations for timber production. Activities related to forest management within municipal watersheds have the potential to adversely affect water quality. Timber harvesting...
Four wetland sites were identified and delineated in Silver Falls State Park, Oregon using procedures outlined in the 1989 Federal Manual for the Identification and Delineation of Jurisdictional Wetlands and subsequently monitored for a ten month period. A network of 225 shallow (32") wells was installed throughout the sites to...
Fluorescent dye was used to assess summer low flow
hydraulic retention and transient storage (dead zone)
associated with fish habitat structures at Camp Creek,
Drift Creek, and the East Fork of Lobster Creek within the
central Coast Range of Oregon. Utilizing channel units to
stratify stream reaches, the effect of...
The objectives of this study were to determine: 1)
differences in average wood quality and strength properties
of clear-wood specimens sampled from juvenile, transition,
and mature wood zones in Douglas-fir (Pseudotsuga menziesii
(Mirb.) Franco) trees from known forest sites; 2)
relationships among wood quality properties [specific
gravity (SG), rings per...
The Steamboat Creek basin drains 227 mi² (588 km²) of steep forested terrain into the North Umpqua River of Southwest Oregon, 39
mi (63 km) northeast of Roseburg. Summer base flows for Steamboat Creek average 83 cfs (2.35 m³/sec). Steamboat Creek and its
tributaries are considered important to the production...
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 10 days of life, and 0.37 and 0.34 to fledging for
1988, 1989, and 1990, respectively. For the...
Dimensional characteristics of 44 beaver dams and ponds on Kuiu Island in Southeast Alaska were determined to evaluate the hydrologic effects of these structures on peak flows. The study area consisted of low gradient, incised streams in broad U-shaped valleys. Pond routing simulations were conducted using four return intervals (2-,...
Douglas-fir [Pseudotsuga menziesii (Mirb.) Franco] lumber was
converted to flakes, which were dip treated with three concentrations
each of copper chrome arsenate Type C (CCA-C), and disodium octaborate
tetrahydrate (TIM-BOR). Azaconazole [1-[{2-(2,4-dichloropheny1)-1,3-
dioxolan-2-yl}methyl]-1H-1,2,4-triazole] was used as powder. The
flakeboard panels (305 x 304 x 13 mm) were made using phenolformaldehyde...
The purpose of this study was to investigate variation
in some intra-ring characteristics in juvenile and mature
wood from two Douglas-fir genetic plantations established
in 1912 by the U.S. Forest Service. The experimental
material consisted of progeny from thirty families
representing ten provenances (3 families per provenance)
grown in two...
This study was undertaken to gain further
understanding of the subsurface hydrology for a stream-adjacent
riparian area in Western Oregon's Coast Range.
Spatial and temporal fluctuations of the free water
surface of a toeslope, adjacent riparian area, and stream
channel in a forested terrace reach were monitored over a
period...
This study was undertaken to evaluate the occurrence and characteristics of undercut streambanks in forested headwater streams of the Oregon Coast Range. Undercut streambanks and associated reach characteristics were surveyed along 46 sample reaches (each 152 m in length) in 8 streams; all sample reaches occurred in unmanaged forested riparian...
During the springs of 1988 1989, experiments were
conducted to determine effective methods of controlling damage
by ring-necked pheasants (Phasianus coichicus) to sprouting
corn in southwestern Idaho. Plot evaluations (1988) failed
to demonstrate the ability of Miller Hot Sauce Animal
Repellent, Isotox Seed Treater (F), provision of alternate
food, and...
I evaluated the use of various wetlands by wintering ducks in
the Tulare Lake Basin (TLB), California, during October 1982 - April
1983 and September 1983 - March 1984. Aerial waterfowl counts of the
TLB were used to document spacial use patterns by ducks. Ground
surveys on evaporation ponds in...
The purpose of this paper is to illustrate the use of Linear Programming (LP) and
other mathematical procedures to evaluate watershed and perpetuity constraints on forest
land use for a selected scenario in Terengganu, Peninsular Malaysia. The paper describes
the system of modelling and forecasting estimates of potential timber growth,...
This study examined the occurrence of coarse woody debris (i.e., pieces greater than 0.15 m in diameter and 2.0 m in length) in first- through fifth-order streams located within the Drift Creek Basin of the Oregon Coast
Range. Nine "tributary reaches" were surveyed to determine how three land management treatments...
The characteristics and associated storage dynamics of approximately 2000 pieces of fine woody debris (FWD; 2.5 cm <diameter<10 cm and 0.3 m<length<10 m) was evaluated over a three-year period in two undisturbed
salmonid nursery streams in Southeast Alaska. To index a given reaches propensity to capture and store FWD over...
Transfer students often experience difficulties in
adjusting to a new institutional environment, and these
difficulties may limit their academic potential. Success
predictors identified in research may not be part of their
experiences. Can an institution create a formal process
which can ameliorate deficiencies within success factors
for transfer students? This...
Extended orientation courses have been shown to be a
valuable means of increasing student retention. However,
little is known about the extent of their use, their form,
their organization or their content. The purpose of this
study was to determine what is being done in today's two-year
college extended orientation...
This study was undertaken to: 1) determine the
relationship between community college counselor role
congruence and job satisfaction and 2) to consider
factors that contribute to or depreciate counselor role
congruence and job satisfaction.
The subjects consisted of four groups that were
compared in terms of their perceptions of community...
In this paper, Fourier analysis is used to
investigate various approximation methods for the one- and
two-dimensional wave equations. The spatial derivatives
are approximated by the second order centered finite
difference method, the linear and quadratic finite element
methods, and the fourth order centered finite difference
method. The approximation schemes...
The study investigates the influence of the self-reference
effect upon the amount of main and subordinate ideas which older
adults can recall and recognize after viewing the television
documentary entitled, The Xinquana: Aborigines of South America.
The participants are native English-speaking Americans who are
50 years old or older. The...
Between 1982-1984 I studied site tenacity and mate retention in Black Terns at Sycan Marsh, Lake County, Oregon. I banded 778 adult Black Terns and used this marked population to test the hypotheses that site tenacity and mate retention would be less for Black Terns which nest in variable marsh...
The characteristics and interactions of the riparian
stand, large woody debris (LWD), and channel morphology
were examined on five undisturbed, low gradient streams in
southeast Alaska. One first-, two second-, one third-,
and one fourth-order streams were studied. Stream
morphology variables were measured systematically at fixed
intervals of three to...
Simulation of storm hydrographs in the Oregon Coast Range was explored using the Soil Conservation Service (SCS) curve number methodology, and by developing and testing an antecedent precipitation index (API) method.
Standard SCS procedures over-estimated peak discharge by about a factor of two (i.e., average over-prediction of 118 percent). When...
Tracer-derived estimates of hydraulic resistance and transient hydraulic
storage were related to measures of pool volume and channel morphometric
variability in small streams of the Oregon coast, U.S.A. Fourteen
100 m study reaches in 3 streams were selected to compare channel
and hydraulic characteristics in streams representing a time series...
The Elk River Basin drains 93 sq ml of steep forested terrain
on the west side of the Klamath Mountains in Southwest Oregon.
This river and its tributaries support a diverse and abundant
population of anadromous fish; a hatchery located at river mile 13
(km 21) supplements these native populations....
Seven species of water-dependent birds (northern phalarope,
Phalaropus lobatus; American avocet, Recurvirostra americana; Wilson's
phalarope, P. tricolor; eared grebe, Podiceps nigricollis;
ring-billed gull Larus delawarensis; California gull, L.
californicus; and northern shoveler, Anas clypeata) were studied
during the fall migrations of 1982 and 1983 to determine the diets and
foraging...
A new carbohydrate-phenol based resorcinol resin
(CPR resin) was synthesized by end capping a known
carbohydrate-phenol based resole with resorcinol under
basic reaction conditions. Synthetic parameters, such as
duration of cook, pH, and the amount of resorcinol and
formaldehyde were varied to produce resins with molecular
weights (Mw) ranging from...
Eight postemergence herbicides were evaluated to determine
their influence on the incidence and severity of take-all disease
caused by the fungus Gaeumannomyces graminis var. tritici in winter
wheat. Mecoprop ((+)-2-(4-chloro-2-methylphenoxy)propanoic acid),
difenzoquat (1,2- dimethyl- 3,5- diphenyl -1H- pyrazolium), dinoseb amine
(amine salt of 2-(1-methylpropy1)-4,6-dinitrophenol), and diclofopmethyl
(methyl ester of (+)-2-[4-(2,4-dichlorophenoxy)...
Field microplot studies conducted over two seasons
(1982-1984) evaluated the influence of four physically and
chemically diverse soils collected from Pacific Northwest
wheat fields on the incidence of dwarf bunt of winter
wheat caused by Tilletia controversa Kuhn. These soils
were placed at Flora and Pendleton, Oregon to determine
the...
This study compared leaf mold, bark, automobile waste and the
combination of half leaf on the top and half bark on the bottom as
growing media for young apple nursery stock. Although the chemical
and physical analysis of leaf mold was superior to the bark, trees
in leaf mold showed...
Adult female Dusky Canada Geese were studied on the
Copper River Delta, Alaska and in the Willamette Valley,
Oregon during April through July, 1977 to 1979. Objectives
of the research were to: 1) determine the chronology of use
of protein and energy reserves in relation to four periods
of reproduction...
The benthic amphipod Corophium salmonis was sampled seasonally from two sites (Desdemona Sands and Grays Bay) in the Columbia River estuary. Populations of C. salmonis at both sites were found to have a two generation per year life cycle, a spring generation and a fall generation. The spring generation juveniles...
Quantitative and qualitative information on the retention of chlorinated residues in chloropicrin treated wood is lacking. Retention of chloropicrin and its chemical breakdown products in wood, and the effects of chloropicrin treatment of wood on invading decay fungi are explored in this thesis. Chlorinated residues in amounts up to 1.5%...
Diet, nutrition, and foraging strategies of canvasbacks (Aythya valisineria) and redheads (A. americana) were studied by collecting actively feeding birds throughout the reproductive season in 1980 and 1981; samples of available foods were taken each time a bird was collected. Nutrient composition of the aggregate diet was determined for each...
Nine Prairie Falcons (Falco mexicanus) were radio-tagged
in northern California during the spring and summer
of 1976 and 1977 to study foraging behavior. The mean home
range size for 3 males was 227.8 km²; largest portions of
the home range were used during the incubation period.
Shifts in foraging areas...
Mysids were sampled seasonally from the intertidal
zone of the beach to a depth of 61 m offshore along the
mid-Oregon coast. The seven mysid species collected
occurred in characteristic bathymetric zones, with members
of different genera occupying overlapping zones
while members of the same genus occupied largely different
zones....
The use of fungicides for the control of foot rot of winter
wheat, caused by Pseudocercosporella herpotrichoides (Fron) Dei.,
requires a forecast of disease risk to optimize this management
practice ecologically and economically. Foot rot occurs in both
the mild, wet (100+ cm, ppt./year) annual cropped areas in western
Oregon,...