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The timing of ocean entry by salmon smolts is presumed adaptive to maximize survival during this critical life transition. We analyzed the peak timing, duration, and interannual variation in timing of smolt migrations for 53 coho salmon ( Oncorhynchus kisutch ) populations from central California to Kodiak Island, Alaska. The objective was to examine potential influences of both local watershed characteristics and larger-scale processes in the marine environment on smolt migration patterns. Multivariate analyses demonstrated a strong latitudinal gradient in migration patterns with trends toward later, shorter, and more predictable migrations with increasing latitude. Cluster analysis performed on migration descriptors indicated three major population groupings that coincide with major coastal oceanic regions in the northeast Pacific: a northern group from Kodiak Island to the Queen Charlotte Islands, British Columbia, a central group from the Queen Charlotte Islands south to the Columbia River, and a southern group from the Columbia River southward. These regional patterns transcended local variability associated with watershed characteristics and trap location, suggesting that the patterns reflect adaptation to differences in timing and relative predictability of favorable conditions in the marine environments that smolts enter.

This study examined the influence of fall-spawning coho salmon (Oncorhynchus kisutch) on the density, growth rate, body condition, and survival to outmigration of juvenile coho salmon on the Copper River Delta, Alaska, USA. During the fall of 1999 and 2000, fish rearing in beaver ponds that received spawning salmon were compared with fish from ponds that did not receive spawners and also with fish from ponds that were artificially enriched with salmon carcasses and eggs. The response to spawning salmon was variable. In some ponds, fall-spawning salmon increased growth rates and improved the condition of juvenile coho salmon. The enrichment with salmon carcasses and eggs significantly increased growth rates of fish in nonspawning ponds. However, there was little evidence that the short-term growth benefits observed in the fall led to greater overwinter growth or survival to outmigration when compared with fish from the nonspawning ponds. One potential reason for this result may be that nutrients from spawning salmon are widely distributed across the delta because of hydrologic connectivity and hyporheic flows. The relationship among spawning salmon, overwinter growth, and smolt production on the Copper River Delta does not appear to be limited entirely to a simple positive feedback loop.

The study objective was to investigate the response of salmonid populations to disturbance in Oregon Coast Range streams in two rock types, basalt and sandstone. Salmonid abundance was estimated in a total of 30 km of channel in 10 Oregon Coast Range streams with similar basin areas (14–20 km2). These basins had a range of disturbance caused by timber harvest, fire, and salvage logging. Mean channel gradient in sandstone was 0.012 m/m, and pools were the dominant habitat type. Mean channel gradient in basalt (0.025 m/m) was twice that in sandstone, and riffles were the dominant habitat type. Mean percentages by length of pools, glides, and riffles were 47, 33, and 20%, respectively, in sandstone, compared with 24, 27, and 50% in basalt. Channel gradient and channel morphology appeared to account for the observed differences in salmonid abundance, which reflected the known preference of juvenile coho salmon Oncorhynchus kisutch for pools. Coho salmon predominated in sandstone streams, whereas stee...

Populations of coastal cutthroat trout Oncorhynchus clarki clarki were sampled in 16 Oregon headwater streams during 1991–1993. These streams were above upstream migration barriers and distributed among basins that had been logged 20–30 and 40–60 years ago and basins that had not been logged but had burned 125–150 years ago. The objective of our study was to characterize the populations and habitats of age-1 or older cutthroat trout within these three forest management types. Streams within unlogged basins had relatively low levels and a small range of trout biomass (g/m2). Streams in basins logged 40–60 years ago supported low levels but an intermediate range of trout biomass. Streams in basins logged 20–30 years ago supported the widest range of biomass, including the lowest and highest biomasses among all streams sampled. The variable that best explained the variation of trout biomass among all 16 streams was the amount of large woody debris (LWD). All streams were heavily shaded during at lea...

Continuous retrograde warm blood cardioplegia was compared with two widely used hypothermic myocardial protection techniques in a canine model of acute regional myocardial ischemia with subsequent revascularization. Animals (n = 30) underwent 45 minutes of left anterior descending coronary artery occlusion then cardioplegic arrest (60 minutes), followed by separation from cardiopulmonary bypass and data collection. The cold oxygenated crystalloid cardioplegia group (CC; n = 8) and the cold blood cardioplegia group (CC; n = 10) had cardiopulmonary bypass at 28 degrees C, antegrade arrest, and intermittent retrograde delivery. The warm blood cardioplegia group (WB; n = 12) had normothermic cardiopulmonary bypass, antegrade arrest, and continuous retrograde delivery. Overall ventricular function (preload recruitable stroke work relationship; ergs x 10(3)/mL) was significantly (p0.001) better for WB (WB, 80 +/- 11; CB, 67 +/- 13; CC, 57 +/- 12). Systolic function (maximum elastance relationship; mm Hg/mL) was also significantly (p0.001) better for WB (WB, 11.6 +/- 3.6; CB, 8.6 +/- 2.7; CC, 6.2 +/- 1.3). Diastolic function (stress-strain relationship; dynes x 10(3)/cm2) revealed significantly (p0.001) decreased compliance for CC (WB, 20 +/- 6; CB, 19 +/- 7; CC, 27 +/- 11). Left anterior descending coronary artery regional adenosine triphosphate/adenosine diphosphate ratios were significantly (p = 0.02) worse for CC (WB, 10.2 +/- 2.3; CB, 9.4 +/- 2.6; CC, 5.6 +/- 1.5). Myocardial edema significantly (p = 0.03) increased over time only in the CC animals (WB, 0.4% +/- 2.3%; CB, -0.3% +/- 3.6%; CC, 5.5% +/- 2.3%). In this model of acute regional myocardial ischemia and revascularization, continuous retrograde warm aerobic blood cardioplegia provided superior myocardial protection compared with cold oxygenated crystalloid cardioplegia with intermediate results for cold blood cardioplegia.

After World War II, increasing demand for natural resources in the Pacific Northwest led to potential conflicts concerning their use. In particular, the demand for lumber in housing construction caused an upsurge in the rate of logging. This led to concerns that salmonid resources were being adversely affected by logging practices then in place (McKernan et al. 1950). In a farsighted move, the governor of Oregon established a Natural Resources Committee in state government in the early 1950s, made up of the executives of all state agencies concerned with natural resources. This committee was charged with coordinating the management of resources and resolving conflicts where possible. To that end, committee members began planning for an integrated study of the natural resources in a river basin. In 1954, the governor’s committee held a well-attended public meeting in the Alsea River Basin to gather comments and recommendations from concerned residents who had established their own committee structure (Anonymous 1954). Based on that meeting, and on recommendations from the governor’s committee, the Oregon legislature passed a bill providing an appropriation of $50,000 to establish a basin study, with an effective date of 1 July 1957. The study was to be administered by the Natural Resources Committee, which selected the Alsea River Basin for analysis. The overall goal of the Alsea Basin Study of Integrated

Aminooleic acid treatment has been demonstrated to prevent porcine valve calcification and to protect valvular hemodynamic function. Initial enthusiasm was tempered by histologic studies of these AOA valves, which showed cuspal hematomas, structural loosening, and surface roughening. This prompted a systematic review of the AOA treatment process. Unsolubilized particles of alpha aminooleic acid present in the treatment solution were identified as the cause of mechanical abrasion of valve cusps during processing. These particles were eliminated with a revamped protocol, which included filtration of the AOA solution before valve preparation.Porcine aortic valve cusps treated with this modified AOA protocol (AOA II) were studied in a rat subdermal implant model of mineralization. A juvenile sheep trial was then used to confirm the antimineralization effects of AOA II on glutaraldehyde-fixed porcine aortic roots in a circulatory model of accelerated calcification.Retrieved AOA II-treated cusps from the subdermal model were markedly less calcified than control cusps (AOA II, 1 +/- 0, 17 +/- 4, 23 +/- 6, and 17 +/- 10 versus control, 189 +/- 14, 251 +/- 16, 250 +/- 14, and 265 +/- 10 mg calcium/mg sample at 4, 8, 12, and 16 weeks, respectively; p0.0001). Morphologic examination of the AOA II cusps of the valves retrieved from the sheep demonstrated freedom from the structural loosening, surface roughening, and hematoma formation that had limited the utility of the original AOA preparation technique. Cusps from AOA II-treated porcine roots had significantly less calcium than control cusps (AOA II, 5.5 +/- 3.0 mg/g; control, 91.2 +/- 19.5 mg/g; p = 0.0004). The aortic walls had similar levels of calcification (AOA II, 156 +/- 73 mg/g; control, 159 +/- 10 mg/g; p = not significant).These data suggest that the modified AOA technique warrants further evaluation as an antimineralization treatment for glutaraldehyde-fixed porcine bioprostheses.

The Federal Aviation Administration is conducting preliminary environmental assessments at most of its present or former facilities in Alaska. The Federal Aviation Administration owns and operates airway support facilities at Puntilla Lake, Alaska. They wish to consider the current environmental setting when evaluating options for compliance with environmental regulations and potential remediation. Information about environmental conditions at Puntilla Lake are presented in this report including an overview of local geology, hydrology, and a description of general geohydrologic conditions. Because of the remote location and small year-round population, information is limited.

(1978). An improved design for assessing impacts of watershed practices on small streams. SIL Proceedings, 1922-2010: Vol. 20, No. 2, pp. 1359-1365.

The objectives of this study were to examine the interactions of the riparian setting (logged vs. forested) and prey availability on the prey capture efficiency and growth of cutthroat trout, and to determine if the riparian setting influences the impact of trout predation on drift composition. Short-term relative growth rates of cutthroat trout, experimentally confined in stream pools, were greater in a logged than in a forested section of stream. Differences in growth rates were attributed to differences among pools in invertebrate drift density, and to differences in trout foraging efficiency that were related to differences between the sections in the amount of overhead shading and substrate crevices. Mean percentages of introduced prey captured by trout were greater in logged control pools and pools of both sections whose bottoms were covered with fiberglass screening to eliminate substrate crevices than in forested control pools and logged pools that were artificially shaded. A logarithmic relationship was found between trout foraging efficiency and surface light of pools. Drift density significantly increased relative to controls in pools from which trout were removed in the logged reach, but not in the forested section. This may result from .habitat features in the logged section that favor greater trout foraging success and the occurrence of behaviorally drifting prey taxa, which represent a predictable food supply for the trout.

Vertical distribution of sediment (particle diameter

Peaks in migration of wild juvenile coho salmon (Oncorhynchus kisutch) from Knowles Creek (Siuslaw River, Oregon) occurred in November and May. Condition factor of nonmigrant fish was higher than migrants or captives throughout the study. Skin guanine levels of migrant fish rose sharply during the first 2 wk of April and continued to rise through June. Gill (Na + K)-ATPase specific activity of migrants rose gradually from a low in January to a maximum in June. Gill (Na + K)-ATPase activity of migrants and nonmigrants was low and not significantly different during November to mid-March. During April, however, gill ATPase activity of migrants rose to become significantly higher than that of nonmigrants until the first 2 wk of May. Cyclic changes in gill (Na + K)-ATPase activity was not observed in these fish. Gill (Na + K)-ATPase activity of fish reared in a laboratory was similar to that of wild nonmigrants until it peaked during the last 2 wk of April, after which the specific activity was lower than either migrants or nonmigrants.

Assemblages of aquatic vertebrate and insect predators were inventoried in streams in old-growth and logged coniferous forests in the western Cascades of Oregon to assess effects of clear-cut logging on stream communities. Effects associated with logging depended on stream size, gradient, and time after harvest. Clear-cut sections where the stream was still exposed to sunlight (5–17 yr after logging) generally had greater biomass, density, and species richness of predators than old-growth (> 450-yr-old) forested sections. Increases were greatest in small (first-order), high gradient (10–16%) streams, where clear-cut sites had both greater periphyton production and coarser streambed sediment than old-growth sites of similar size and gradient. Effects on predators were mixed in larger, lower gradient streams, where clear-cut sites showed accumulation of sediment and relatively small increases in periphyton production. Second-growth logged sections (12–35 yr after logging), reshaded by deciduous forest canopy, had lower biomass of trout and fewer predator taxa than old-growth sites.Key words: trout, salamanders, insects, logging, sediment, periphyton, watershed management

The temperature and dissolved oxygen content of intragravel water were measured in three Oregon coastal streams between June 1968 and June 1969. In 1966, the watershed of one stream had been completely clearcut, and that of a second stream partially clearcut in staggered settings. A third watershed was left unlogged. Clearcut logging resulted in increased temperature of intragravel water in salmon and trout spawning beds and decreased concentrations of dissolved oxygen. The changes were related largely to reduced forest cover over the stream surface and to deposition of fine sediment in the gravel. No serious reduction in survival to emergence of coho salmon occurred along with the observed changes in temperature or dissolved oxygen. A decrease in the resident population of cutthroat trout after logging may have been related to these changes.

This paper describes a method of direct measurement of the primary production of the benthic algal community in the lotic environment hat eliminates calculations of diffusion and is adaptable to the various chemical analyses used to indicate rates of production. 'This technique was developedl at Oregon State University, Corvallis, and supported by Research Grant WP 423, Federal Water Quality Administration. Benthic algal communities have been shown to be highly productive and may be more so than phytoplankton in shallow embayments (Odum et al. 1959; Pomeroy 1959; Smalley 1959; Teal 1959). In the lotic environment the significance of the benthic primary community varies. In headwater streams, allochthonous material may be more significant as a primary food source than the benthic algae produced in the stream (Chapman and Demory This content downloaded from 128.193.8.24 on Wed, 28 Aug 2013 14:57:21 PM All use subject to JSTOR Terms and Conditions

From tungsten ore to assembled lamp, the production of a Mazda lamp at the Westinghouse lamp factory at Bloomfield, N. J., is here surveyed

A gamma ray spectrometer that combines the techniques of neutron time‐of‐flight spectroscopy and gamma ray total absorption spectroscopy is described. Data on gamma ray pulse height resolution and photopeak efficiency are presented. Representative pulse height spectra from neutron inelastic scattering reactions are shown.

Spawning and emergence of coho and fall chinook salmon overlapped in timing and location in Sixes River, Oregon. In early spring both species were distributed throughout most of the river system. Underwater observations during this period indicated that both species occupied the same habitat. As temperatures increased, coho disappeared from the main river, but continued to occupy cool tributaries. Fall chinook were found primarily in the main river until early summer, when they moved to the estuary.In flowing-water observation troughs coho assumed social dominance and defended space near the source of incoming food. In allopatry in the troughs, both grew at similar rates, but coho maintained lower population densities than did chinook. In sympatry in the troughs or in cool tributary streams, coho grew faster than chinook. Coho had brighter fin and body colors, greater fin development, deeper bodies, and were heavier than fall chinook of the same length.Our study suggests that the population of fall chinook salmon in Sixes River might be adversely affected by an increase in numbers of coho. Our evidence suggests that ecology of native fishes should be examined closely before widespread manipulation of fish stocks is encouraged.

Significant progress has been made toward accomplishing measurement of the energy absorbed from a proton as a function of the path length of the proton in the sensitive volume of a semiconductor detector. Surface barrier P- N and P-i-N detectors were used in the study utilizing path lengths as short as 100 microns and as long as 10 cm. Protons of initial energy of 16, 40, and 187 mev were used. Other proton energies (8 to 166 mev) were obtained by using absorbers in the proton beam. Energy calibrations were accomplished by total absorption of protons of known energy.

The kinetics of recuperation following initial doses of 470 rads of 55 Mev protons and 350 rads of Co60 gamma radiation were investigated by means of the paired-dose method. By using semilog plots, recovery half-times of 4.85 plus or minus .85 days and 2.02 plus or minus .45 days were found after initial doses of the protons and Co60 gamma radiation, respectively.

The Harvard Synchrocyclotron Facility was the source of protons. A diagram of the experimental arrangement used for the irradiations with the cyclotron is shown in Fig. 1. Exposures were made in the primary proton beam which was defocused by a lead scatterer of 7.6 gm/cm2 placed at the exit of the cyclotron drift pipe. During exposure the mice were held in individual aluminum-screen cylindrical cages 3.8 cm in diameter by 10.2 cm long, stacked on 3.93-cm centers and oriented as shown in the diagram. The irradiations were performed with 4 mice at a time at a distance of 161 cm from the scatterer, with 6 mice at a time at 228 cm, and with

The effect of ionizing radiation on man is of vital interest to the space program. To further knowledge of these effects, a study involving whole-body exposures of primates to ionizing radiation has been initiated. The primate Macaca mulatta has been chosen as a suitable subject. Part of the study calls for irradiation of these animals by protons of various energies in the range 32 Mev to 2.3 Bev. This paper outlines the physical aspects and dosimetry of the whole-body irradiations with 32-Mev, 55-Mev, 138-Mev, 250-Mev, and 400-Mev protons, embracing the energy region where meson production can be considered negligible. The resultant biological effects are described elsewhere (1-8). At all energies the primates were placed in rotating cages during exposure to obtain a uniform distribution of dose. In the 32-Mev and 55-Mev exposures the protons did not penetrate completely through the primates, and the surface dose was used as the reference. At the higher energies the protons passed through the primates, and reasonably uniform body doses were obtained. Doses from 25 to 7000 rads were given, the dose rate varying with the different irradiation facilities. The 32-Mev and 55-Mev experiments were performed at the Oak Ridge Isochronous Cyclotron, the 138-Mev experiments at the Harvard University Synchrocyclotron, and the 250-Mev and 400-Mev experiments at the University of Chicago Synchrocyclotron. Dose-rate considerations made it necessary to use the three different facilities. At Harvard and Chicago multiple-Coulomb scattering was used to obtain the broad-beam profile required for the exposures; at Oak Ridge the beam optics system was able to defocus the beam to given an acceptable proton distribution. Exposures at each energy constituted an entity in themselves; however, the procedures followed are similar and are covered in detail only for the 32-Mev exposures. Beam measurements were made to determine the proton flux, and hence the time