An Investigation of the Relationship Between Oregon Coho Salmon (Oncorhynchus kisutch) Hatchery Releases and Adult Production Utilizing Law of the Minimum Regression

1983 ◽  
Vol 40 (4) ◽  
pp. 516-523 ◽  
Author(s):  
Jerry Clark ◽  
Bruce McCarl
Keyword(s):  
Density Dependence ◽  
Regression Models ◽  
Coho Salmon ◽  
Oncorhynchus Kisutch ◽  
Regression Technique ◽  
Limiting Factors ◽  
Regression Equations ◽  
Simple Simulation ◽  
The Relationship

This study examines aggregate relationships between coho salmon (Oncorhynchus kisutch) adult production and hatchery releases within the Oregon Index Area (OIA). Previous analyses have indicated the presence of density dependence, and concluded with a request for a reduction in hatchery smolt releases. The hypothesis that density dependence is exhibited in the OIA is tested via a broad correlation approach. Several regression models are used including one unique one in fisheries research based on limiting factors.Analysis was done on the fitted regression equations including a simple simulation of release policies. Neither significant density dependence nor a statistically supportable technical maximum for smolt releases was found. The limiting factors regression technique generally gives the best results of all the models employed, and thus appears potentially useful in this type of fisheries work.

EEG-correlates of work efficiency level among young persons with stress-induced bruxism

2021 ◽  
pp. 25-29
Author(s):  
A. E. Barulin ◽  
S. V. Klauchek ◽  
A. E. Klauchek
Keyword(s):  
Regression Models ◽  
Alpha Rhythm ◽  
Negative Relationship ◽  
Maximum Amplitude ◽  
Dominant Frequency ◽  
Regression Equations ◽  
Microsoft Excel ◽  
The Subject ◽  
Males And Females ◽  
The Relationship

Purpose of the study. To establish the relationship between neurophysiological status and the level of efficiency in young people with bruxism.Materials and methods. Two groups of 64 and 53 subjects (males and females) aged 20–35 years old with bruxism and non-bruxers were formed according to questionnaire results and physical examination. The level of efficiency was assessed by the results of sensorimotor tracking of a moving object (the ‘Smile’ model). Spectral analysis was performed for evaluation of the baseline electroencephalograms. Microsoft Excel and Statistica 10.0 programs were used for statistical data processing.Results. The level of efficiency was statistically significantly lower in the hardest test of Smile model among the individuals with bruxism (p < 0.05). The bruxers also demonstrated a significantly lower dominant frequency and maximum amplitude of alpha-rhythm (p < 0.05), and significantly higher dominant frequency of beta2 rhythm (p < 0.05). The dominant frequency and the maximum amplitude of the alpha-rhythm are parameters corresponding to significant coefficients of the regression analysis. A negative relationship was found between the degree of error during sensorimotor tracking and the frequency and amplitude of alpha-rhythm.Conclusion. Regression models present the relationship between the level of efficiency and the alpha-rhythm severity. The regression equations make it possible to determine the functional state of the subject using an electroencephalogram.

Density-Dependence at Sea for Coho Salmon (Oncorhynchus kisutch)

1990 ◽  
Vol 47 (9) ◽  
pp. 1765-1772 ◽  
Author(s):  
J. M. Emlen ◽  
R. R. Reisenbichler ◽  
A. M. McGie ◽  
T. E. Nickelson
Keyword(s):  
Density Dependence ◽  
Coho Salmon ◽  
Oncorhynchus Kisutch ◽  
Density Dependent ◽  
Density Dependent Mortality ◽  
Hatchery Fish ◽  
Statistical Assumptions ◽  
Diminishing Returns ◽  
Salmon Hatchery ◽  
Dependent Mortality

The success of expanded salmon hatchery programs will depend strongly on the degree of density-induced diminishing returns per smolt released. Several authors have addressed the question of density-dependent mortality at sea in coho salmon (Oncorhynchus kisutch), but have come to conflicting conclusions. We believe there are compelling reasons to reinvestigate the data, and have done so for public hatchery fish, using a variety of approaches. The results provide evidence that survival of these public hatchery fish is negatively affected, directly by the number of public hatchery smolts and indirectly by the number of private hatchery smolts. These results are weak, statistically, and should be considered primarily as a caution to those who, on the basis of other published work, believe that density-dependence does not exist. The results reported here also re-emphasize the often overlooked point that inferences drawn from data are strongly biased by investigators' views of how the systems of interest work and by the statistical assumptions they make preparatory to the analysis of those data.

Food abundance and territory size in juvenile coho salmon (Oncorhynchus kisutch)

1981 ◽  
Vol 59 (9) ◽  
pp. 1801-1809 ◽  
Author(s):  
Lawrence M. Dill ◽  
Ronald C. Ydenberg ◽  
Alex H. G. Fraser
Keyword(s):  
Coho Salmon ◽  
Oncorhynchus Kisutch ◽  
Food Abundance ◽  
Territory Size ◽  
Feeding Territory ◽  
Effect Of Food ◽  
Benthic Food ◽  
The Relationship ◽  
Potential Food ◽  
Behavioural Mechanism

Feeding territory size and potential food abundance were measured simultaneously in a field population of juvenile (40–50 mm) coho salmon. Territory size was inversely related to the density of benthic food on the territory, as predicted from an energy-based model of territoriality. The relationship between the abundance of drift food and territory size was in the predicted direction, but was not significant. Territories were also smaller where intruder pressure was higher, but intrusion rate and food abundance were not directly correlated. Therefore, the effect of food abundance on territory size was not caused indirectly by attraction of nonterritorial fish to areas where food was abundant. In the laboratory, the distance from which a resident coho attacked an approaching model intruder increased asymptotically with hunger. The fish therefore appear to possess an appropriate behavioural mechanism (tactic) to adjust territory size to local food abundance.

Effect of Temperature, Season, and Fish Size on Acute Lethality of Suspended Sediments to Coho Salmon (Oncorhynchus kisutch)

1991 ◽  
Vol 48 (3) ◽  
pp. 493-497 ◽  
Author(s):  
James A. Servizi ◽  
Dennis W. Martens
Keyword(s):  
Oxygen Transfer ◽  
Coho Salmon ◽  
Oncorhynchus Kisutch ◽  
Suspended Sediments ◽  
Effect Of Temperature ◽  
Fraser River ◽  
Metabolic Rates ◽  
Temperature Dependent ◽  
Cough Reflex ◽  
The Relationship

Tolerance of underyearling coho salmon (Oncorhynchus kisutch) to Fraser River suspended sediments (SS) at 7 °C was independent of season of the year. However, coho of 0.52 g (4.0 cm) possessed only 35% of the tolerance of larger specimens. Tolerance to SS was temperature dependent, with 96-h LC50 at 1 and 18 °C being 47 and 33%, respectively, of the value at 7 °C. Tolerance was further reduced among underyearling coho which were later found to have a viral kidney infection. Cough reflex, oxygen transfer, oxygen saturation levels, metabolic rates, and capacity to do work all probably affect the relationship between SS tolerance and temperature.

Cost of Sustained and Burst Swimming to Juvenile Coho Salmon (Oncorhynchus kisutch)

1984 ◽  
Vol 41 (11) ◽  
pp. 1546-1551 ◽  
Author(s):  
K. J. Puckett ◽  
L. M. Dill
Keyword(s):  
Oxygen Consumption ◽  
Metabolic Rate ◽  
Oxygen Consumption Rate ◽  
Sockeye Salmon ◽  
Consumption Rate ◽  
Coho Salmon ◽  
Oncorhynchus Kisutch ◽  
Metabolic Rates ◽  
Burst Swimming ◽  
The Relationship

The relationship between oxygen consumption rate (milligrams per kilogram per hour) and sustained swimming speed (calculated from tailbeat frequency) was determined for 1.2-g juvenile coho salmon (Oncorhynchus kisutch) at 15 °C. The data are best described by the following equation: log oxygen consumption rate = 2.2 + 0.13 (body lengths-s−1). This relationship is very similar to that extrapolated for sockeye salmon (O. nerka) of the same size, thus potentially enabling researchers to utilize the extensive sockeye data base to predict metabolic rates of coho. The oxygen consumption rate during burst swimming (9 body lengths∙s−1) was also determined. The burst swimming metabolic rate (38 000 mgO2∙kg−1∙h−1) is nearly 40 times greater than the maximum sustained swimming metabolic rate.

scholarly journals Modeling the Quality of New Wheat Varieties in Kazakhstan

2019 ◽  
Vol 3 (1) ◽  
pp. 30
Author(s):  
Dauletbakovbakytkan Dauletbakovbakytkan ◽  
Dauletbakov Galym
Keyword(s):  
Regression Models ◽  
Grain Quality ◽  
Regression Equations ◽  
Grain Production ◽  
Wheat Varieties ◽  
New Varieties ◽  
Main Components ◽  
The Relationship ◽  
Significant Factors

The work investigates and demonstrates the analytical capabilities of statistical methods in the development of new varieties of wheat used for the production of pasta. By using examples of Kostanay, Pavlodar, Akmola, North-Kazakhstan region (NKR) and Aktobe regions, foridentifying significant factors, there were constructed regression equations due to initial factors, on the main components, according to the panel data. Based on the analysis of various regression models, the strengths of the relationship between the number  indicators of the grain quality there was found soft and hard wheat varieties (Mereke 70, Tselina 50, Ertis 97, Astana 2, Astana, Aktobe39, Baiterek), taking into account the peculiarities of grain production in this area.

The influence of fall-spawning coho salmon (Oncorhynchus kisutch) on growth and production of juvenile coho salmon rearing in beaver ponds on the Copper River Delta, Alaska

2006 ◽  
Vol 63 (4) ◽  
pp. 917-930 ◽  
Author(s):  
Dirk W Lang ◽  
Gordon H Reeves ◽  
James D Hall ◽  
Mark S Wipfli
Keyword(s):  
Growth Rates ◽  
Feedback Loop ◽  
Coho Salmon ◽  
Oncorhynchus Kisutch ◽  
River Delta ◽  
Short Term ◽  
Beaver Ponds ◽  
Copper River Delta ◽  
The Relationship ◽  
Salmon Carcasses

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 MODEL FOR MANAGING INVESTMENTS IN THE MOSCOW ENVIRONMENT BASED ON A POWER REGRESSION EQUATION

2020 ◽  
Vol 2 (7) ◽  
pp. 91-99
Author(s):  
E. V. KOSTYRIN ◽  
◽  
M. S. SINODSKAYA ◽  
Keyword(s):  
Solid Waste ◽  
Influencing Factors ◽  
Pair Correlation ◽  
Approximation Error ◽  
Regression Equation ◽  
Regression Equations ◽  
The Impact ◽  
The Relationship ◽  
Average Approximation ◽  
Average Approximation Error

The article analyzes the impact of certain factors on the volume of investments in the environment. Regression equations describing the relationship between the volume of investment in the environment and each of the influencing factors are constructed, the coefficients of the Pearson pair correlation between the dependent variable and the influencing factors, as well as pairwise between the influencing factors, are calculated. The average approximation error for each regression equation is determined. A correlation matrix is constructed and a conclusion is made. The developed econometric model is implemented in the program of separate collection of municipal solid waste (MSW) in Moscow. The efficiency of the model of investment management in the environment is evaluated on the example of the growth of planned investments in the activities of companies specializing in the export and processing of solid waste.

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