Feline parasites and the emergence of feline lungworm in the Portland metropolitan area, Oregon, USA 2016–2017

Objectives The aim of this study was to determine the prevalence of internal parasites in feral and free-roaming owned cats in the region of Portland, Oregon, USA. Methods Fecal samples from asymptomatic cats were opportunistically collected from feral cats presented for surgical sterilization (n = 46), as well as free-roaming owned cats (n = 86) presented to primary care clinics. Fecal analysis was performed using the Baermann technique, centrifugal flotation, fluorescent auramine and fluorescent antibody for Giardia species. Results Lungworm infection was identified in 24.2% of owned cats and 17.2% of feral cats. At least 11 unique parasite species were identified in this study. Taenia species and Toxocara cati were identified in higher proportions in feral cats, whereas Giardia species were significantly higher in owned cats. Conclusions and relevance The prevalence of lungworm was higher than has been previously documented in other areas of the USA. In addition, feral cats were infected with a higher percentage of Toxocara species and Taenia but a significantly lower percentage of Giardia species.

The spatial and temporal evolution of the Portland and Tualatin forearc basins, Oregon, USA

The Portland and Tualatin basins are part of the Salish-Puget-Willamette Lowland, a 900-km-long, forearc depression lying between the volcanic arc and the Coast Ranges of the Cascadia convergent margin. Such inland seaways are characteristic of warm, young slab subduction. We analyzed the basins to better understand their evolution and relation to Coast Range history and to provide an improved tectonic framework for the Portland metropolitan area. We model three key horizons in the basins: (1) the top of the Columbia River Basalt Group (CRBG), (2) the bottom of the CRBG, and (3) the top of Eocene basement. Isochore maps constrain basin depocenters during (1) Pleistocene to mid-Miocene time (0–15 Ma), (2) CRBG (15.5–16.5 Ma), and (3) early Miocene to late Eocene (ca. 17–35 Ma) time. Results show that the Portland and Tualatin basins have distinct mid-Miocene to Quaternary depocenters but were one continuous basin from the Eocene until mid-Miocene time. A NW-striking gravity low coincident with the NW-striking, fault-bounded Portland Hills anticline is interpreted as an older graben coincident with observed thickening of CRBG flows and underlying sedimentary rocks. Neogene transpression in the forearc structurally inverted the Sylvan-Oatfield and Portland Hills normal faults as high-angle dextral-reverse faults, separating the Portland and Tualatin basins. An eastward shift of the forearc basin depocenter and ten-fold decrease in accommodation space provide temporal constraints on the emergence of the Coast Range to the west. Clockwise rotation and northward transport of the forearc is deforming the basins and producing local earthquakes beneath the metropolitan area.

Essential Engagement as the First Step in Gaining Entrée into the Laotian American Community on Cervical Cancer Screening

Asian American women, including Laotian American women (LAW), have the lowest rate of being up to date with cervical cancer (CC) screenings at 75% compared to other ethnic groups (85% White, 86% Black, 79% Hispanic, 79% American Indian/Alaska Native; American Cancer Society, 2019; Nghiem, Davies, Chan, Mulla, & Cantor, 2016). This rate is substantially lower than the national objective of 93% (Healthy People.gov, 2020). CC is highly treatable if caught early in the localized stage with a 91.8% 5-year survival rate (National Cancer Institute, n.d.). There is scant research on the incidence and factors surrounding CC screening in Laotian Americans and has primarily been representative of California. The Portland metropolitan area in the United States’ (U.S.) Pacific Northwest has one of the top ten highest Laotian American populations (Greblo, 2011). The Laotian American cultural community leaders (CCLs) in the Pacific Northwest expressed to our academic project team at Washington State University Elson S. Floyd College of Medicine and the College of Nursing that the Laotian American community is a private ethnic group wary of those from the outside and particularly researchers.

Multiple Holocene Earthquakes on the Gales Creek Fault, Northwest Oregon Fore-Arc

ABSTRACT Several potentially hazardous northwest-striking faults in and around the Portland basin, within the fore-arc of Cascadia, are classified as Quaternary active by the U.S. Geological Survey, but little is known about their Holocene activity. We present new earthquake-timing constraints on the Gales Creek fault (GCF), a 73 km long, northwest-trending fault with youthful geomorphic expression located about 35 km west of Portland. We excavated a paleoseismic trench across the GCF in the populated northern Willamette Valley and document three surface-rupturing earthquakes from stratigraphic and structural relationships. Radiocarbon samples from offset stratigraphy constrain these earthquakes to have occurred ∼1000, ∼4200, and ∼8800 calibrated years before the present. The penultimate earthquake back-tilted a buried soil into the hillslope creating accommodation space that was infilled by a colluvial deposit. The most recent earthquake faulted and formed a fissure within the penultimate colluvial deposit. Our results suggest that the GCF has a recurrence interval of ∼4000 yr, and if the full 73 km length were to rupture, it would result in an Mw 7.1–7.4 earthquake, providing a significant seismic hazard for the greater Portland metropolitan area.

An Integrated Feasibility Study of Reservoir Thermal Energy Storage in Portland, OR, USA

<p>In regions with long cold overcast winters and sunny summers, Deep Direct-Use (DDU) can be coupled with Reservoir Thermal Energy Storage (RTES) technology to take advantage of pre-existing subsurface permeability and storage capacity to save summer heat for later use during cold seasons. Many aquifers worldwide are underlain by permeable regions (reservoirs) containing brackish or saline groundwater that has limited beneficial use due to poor water quality. We investigate the utility of these relatively deep, slow flowing reservoirs for RTES by conducting an integrated feasibility study in the Portland Basin, Oregon, USA, developing methods and obtaining results that can be widely applied to groundwater systems elsewhere. As a case study, we have conducted an economic and social cost-benefit analysis for the Oregon Health and Science University (OHSU), a teaching hospital that is recognized as critical infrastructure in the Portland Metropolitan Area. Our investigation covers key factors that influence feasibility including 1) the geologic framework, 2) hydrogeologic and thermal conditions, 3) capital and maintenance costs, 4) the regulatory framework, and 5) operational risks. By pairing a model of building seasonal heat demand with an integrated model of RTES resource supply, we determine that the most important factors that influence RTES efficacy in the study area are operational schedule, well spacing, the amount of summer heat stored (in our model, a function of solar array size), and longevity of the system. Generally, heat recovery efficiency increases as the reservoir and surrounding rocks warm, making RTES more economical with time. Selecting a base-case scenario, we estimate a levelized cost of heat (LCOH) to compare with other sources of heating available to OHSU and find that it is comparable to unsubsidized solar and nuclear, but more expensive than natural gas. Additional benefits of RTES include energy resiliency in the event that conventional energy supplies are disrupted (e.g., natural disaster) and a reduction in fossil fuel consumption, resulting in a smaller carbon footprint. Key risks include reservoir heterogeneity and a possible reduction in permeability through time due to scaling (mineral precipitation). Lastly, a map of thermal energy storage capacity for the Portland Basin yields a total of 87,000 GWh, suggesting tremendous potential for RTES in the Portland Metropolitan Area.</p>

Higher Density Development for Lower Cost Housing? Understanding the Multifamily Housing Market and the Role of Density in Multifamily Home Prices

This study documents the development and the characteristics of multifamily homes in the Portland metropolitan area and evaluate the roles of density and density-related factors in determining multifamily home prices. The study finds that medium-density multifamily homes sell at lower prices than other housing types in dollar per unit and dollar per square foot. The cost-saving effect of higher density development is weak or even negative, and dwelling size is the primary determinant of multifamily home prices. The effects of neighborhood density on home prices depend on housing types. Investors own almost a half of nonapartment multifamily homes and buy homes at lower prices.

Misrecognition in a Sustainability Capital: Race, Representation, and Transportation Survey Response Rates in the Portland Metropolitan Area

US household transportation surveys typically have limited coverage of and responses from people of color (POC), which may lead to inaccurate estimation of POC transportation access and behavior. We recast this technocratic understanding of representativeness as a problem of “racial misrecognition” in which racial group difference is obscured yet foundational for distributive transportation inequities and unsustainability. We linked 2008–2012 population and housing data to an apparent stratified random sample of 6107 household responses to the 2011 Oregon Household Activity Survey (OHAS) in a “sustainability capital”: the Portland, Oregon metropolitan area. We detailed how the 2011 OHAS consistently overrepresented White households and underrepresented Latinx/Nonwhite households in aggregate and at the tract-level. We conducted tract-level spatial pattern and bivariate correlation analyses of our key variables of interest. As expected, our subsequent tract-level spatial error regression analysis demonstrated that the percent of Latinx/Nonwhite householders had a significant negative association with 2011 OHAS household response rates, net of other statistical controls. Further analyses revealed that the majority of the ten “typical” tracts that best represented the spatial error regression results and racial misrecognition in the OHAS exhibited historical and contemporary patterns of racial exclusion and socially unsustainable development in our study area.