Sex ratios of young-of-the-year walleye (Stizostedion vitreum) collected from lakes and rearing ponds of western Canada and northern United States

1988 ◽  
Vol 66 (8) ◽  
pp. 1772-1776
Author(s):  
C. L. Glenn ◽  
J. A. Mathias
Keyword(s):  
Sex Ratios ◽  
Western Canada ◽  
Stizostedion Vitreum ◽  
Individual Data ◽  
Large Lakes ◽  
Pond Size ◽  
Young Of The Year ◽  
Northern United States ◽  
The Individual ◽  
Stocking Rates

A total of 2682 young-of-the-year walleye (Stizostedion vitreum) were examined from 26 culture ponds and 5 large lakes to determine whether the sex ratio of cultured populations deviated from 1:1. Fingerlings from the lake populations were examined as a standard for comparison. Application of a χ2 test to pond data indicated that ponds, as a group, had significant deviations. Three of the ponds produced significantly more females and two of the ponds produced significantly more males. Neither the grouped nor the individual data from lakes produced sex ratios that deviated significantly from 1:1. Environmental factors such as pond size, depth, stocking rates, or time did not seem to influence sex determination.

Genetics of Multiple Malate Dehydrogenase Isozymes in Skeletal Muscle of Walleye (Stizostedion vitreum vitreum)

1971 ◽  
Vol 28 (7) ◽  
pp. 1005-1008 ◽  
Author(s):  
J. W. Clayton ◽  
D. N. Tretiak ◽  
A. H. Kooyman
Keyword(s):  
Skeletal Muscle ◽  
Malate Dehydrogenase ◽  
Western Canada ◽  
Stizostedion Vitreum ◽  
Breeding Experiment ◽  
Malate Dehydrogenase Isozymes ◽  
Nad Oxidoreductase ◽  
The Individual

Electrophoresis of extracts of white skeletal muscle revealed a total of six phenotypes of malate dehydrogenase (MDH) (L-malate; NAD oxidoreductase, EC 1.1.1.37) isozymes in walleye (Stizostedion vitreum vitreum). The individual MDH phenotypes consisted of four or more MDH isozymes.The heritability of all six phenotypes was tested in a breeding experiment. The results of the breeding experiment provided evidence for the existence of three nondominant alleles at one MDH locus. Subcellular fractionations indicated that these three alleles code for a supernatant (extramitochondrial) form of MDH. The frequencies of these alleles varied in fish from four locations in western Canada.

Extracting Visually Presented Element Relationships from Web Documents

2013 ◽  
Vol 7 (2) ◽  
pp. 13-29
Author(s):  
Radek Burget ◽  
Pavel Smrz
Keyword(s):  
Information Retrieval ◽  
World Wide ◽  
Visual Presentation ◽  
Generic Model ◽  
Individual Data ◽  
Web Documents ◽  
The World ◽  
Structured Information ◽  
The Individual ◽  
Document Format

Many documents in the World Wide Web present structured information that consists of multiple pieces of data with certain relationships among them. Although it is usually not difficult to identify the individual data values in the document text, their relationships are often not explicitly described in the document content. They are expressed by visual presentation of the document content that is expected to be interpreted by a human reader. In this paper, the authors propose a formal generic model of logical relationships in a document based on an interpretation of visual presentation patterns in the documents. The model describes the visually expressed relationships between individual parts of the contents independently of the document format and the particular way of presentation. Therefore, it can be used as an appropriate document model in many information retrieval or extraction applications. The authors formally define the model, the authors introduce a method of extracting the relationships between the content parts based on the visual presentation analysis and the authors discuss the expected applications. The authors also present a new dataset consisting of programmes of conferences and other scientific events and the authors discuss its suitability for the task in hand. Finally, the authors use the dataset to evaluate results of the implemented system.

scholarly journals Walking the Path of My Ancestors: The Siksikastiapi (Blackfoot Confederacy)

2019 ◽  
Vol 10 (2) ◽  
Author(s):  
Tiffany Prete
Keyword(s):  
Data Analysis ◽  
Indigenous Peoples ◽  
Lived Experiences ◽  
Western Canada ◽  
Historical Texts ◽  
The Individual ◽  
Oblates Of Mary Immaculate ◽  
North Western

 This article articulates myself and my community’s journey navigating the Oblates of Mary Immaculate (OMI) records written historically about our People (the Bloods) in order to identify who our ancestors are. Through the examination of historical texts, records and materials written by the Oblate missionaries of North-Western Canada, we were able to discover the hidden lived experiences of our People. The purpose of this study was to provide new scholarly insights into the texts and records of the Oblates regarding the Blood People. This research took place at the Alberta Provincial Archives over a seven-month period. This article reviews who the Oblates of Mary Immaculate were, and what measures were used to uncover our ancestors in the Provincial Archives. Data analysis determined that the individual archival records fragmented Indigenous Peoples and their history; however, collectively these records blend together to tell a story.

Responses of Walleye (Stizostedion vitreum vitreum) and Yellow Perch (Perca flavescens) Populations to Removal of White Sucker (Catostomus commersoni) from a Minnesota Lake, 1966

1977 ◽  
Vol 34 (10) ◽  
pp. 1633-1642 ◽  
Author(s):  
Fritz H. Johnson
Keyword(s):  
Species Interactions ◽  
Standing Crop ◽  
Yellow Perch ◽  
Perca Flavescens ◽  
Food Competition ◽  
Community Response ◽  
Stizostedion Vitreum ◽  
Catostomus Commersoni ◽  
Young Of The Year ◽  
Fish Species Diversity

In a northeastern Minnesota lake subject only to sportfishing, removal of 85% of the estimated standing crop (34 kg/ha) of adult white suckers, Catostomus commersoni in 1966 was followed by marked changes in community structure and interrelations. During 7 yr alter the removal: catch indices for adult suckers remained far below those before the sucker removal but juvenile suckers increased about 17-fold; yellow perch, Perca flavescens, increased about 15-fold; walleye Stizostedion vitreum vitreum, standing crop increased about one-third; mayflies increased in diet of adult perch and smaller invertebrates decreased; micro-crustaceans increased in diet of young-of-the-year and juvenile perch; young-of-the-year perch increased in diet of adult walleye; walleye angling yield increased from an average of 3.0 kg/ha before the removal to an average of 4.9 kg/ha in 1970–73; the rate of exploitation of adult walleye did not change with increase in angling effort; and the increased walleye harvest consisted mostly of fish recruited to the catch during the fishing season. The average annual harvest of walleye in 1970–73 exceeded estimated potential production for all fish by 81.5% and probably cannot be sustained. Removal of white suckers from lakes with limited fish species diversity appears to benefit percid populations. Key words: Percidae, species interactions, (Stizostedion vitreum vitreum), Perca flavescens, Catostomus commersoni, harvests, community response, community ecology, food, competition

scholarly journals Completeness and Accuracy of a Wide-Area Maritime Situational Picture based on Automatic Ship Reporting Systems

2015 ◽  
Vol 69 (1) ◽  
pp. 156-168 ◽  
Author(s):  
Harm Greidanus ◽  
Marlene Alvarez ◽  
Torkild Eriksen ◽  
Vincenzo Gammieri
Keyword(s):  
Data Sources ◽  
Automatic Identification ◽  
Identification System ◽  
Individual Data ◽  
Area Of Interest ◽  
Reporting Systems ◽  
Ship Tracks ◽  
The Individual ◽  
Additional Value ◽  
System Today

Automatic ship reporting systems (AIS – Automatic identification System, LRIT – Long Range Identification and Tracking, VMS – Vessel Monitoring System) today allow global tracking of ships. One way to display the results is in a map of current ship positions over an area of interest, the Maritime Situational Picture (MSP). The MSP is dynamic and must be created by fusing the reporting systems' messages, constructing ship tracks and predicting ship positions to correct for latency especially in the case of AIS received by satellite which forms the bulk of the data. This paper discusses the completeness of the resulting MSP and the accuracy of its positions, quantifying the additional value of the individual data sources.

scholarly journals Exploratory studies into seasonal flow forecasting potential for large lakes

2018 ◽  
Vol 22 (1) ◽  
pp. 127-141 ◽  
Author(s):  
Kevin Sene ◽  
Wlodek Tych ◽  
Keith Beven
Keyword(s):  
Water Balance ◽  
Lake Victoria ◽  
Spatial Scales ◽  
Data Availability ◽  
Climate Indices ◽  
Test Case ◽  
Large Lakes ◽  
Analytical Approximations ◽  
Seasonal Flow ◽  
The Individual

Abstract. In seasonal flow forecasting applications, one factor which can help predictability is a significant hydrological response time between rainfall and flows. On account of storage influences, large lakes therefore provide a useful test case although, due to the spatial scales involved, there are a number of modelling challenges related to data availability and understanding the individual components in the water balance. Here some possible model structures are investigated using a range of stochastic regression and transfer function techniques with additional insights gained from simple analytical approximations. The methods were evaluated using records for two of the largest lakes in the world – Lake Malawi and Lake Victoria – with forecast skill demonstrated several months ahead using water balance models formulated in terms of net inflows. In both cases slight improvements were obtained for lead times up to 4–5 months from including climate indices in the data assimilation component. The paper concludes with a discussion of the relevance of the results to operational flow forecasting systems for other large lakes.

scholarly journals ABA, ABC, and AAB renewal in fear conditioning using social stimuli and its quantitative description

2021 ◽  
Author(s):  
Masato Nihei ◽  
Daiki Hojo ◽  
Kosuke Sawa
Keyword(s):  
Anxiety Disorder ◽  
Social Anxiety ◽  
Fear Conditioning ◽  
Social Anxiety Disorder ◽  
Bayesian Modeling ◽  
Exposure Therapy ◽  
Quantitative Description ◽  
Individual Data ◽  
Social Stimuli ◽  
The Individual

A relapse in clinical anxiety following exposure therapy for social anxiety disorder is prevalent and causes serious problems. According to the fear conditioning theory of social anxiety disorder, a part of this relapse can be caused by the renewal effect. This study aimed to investigate whether three renewal effects occur in a fear conditioning procedure that uses social stimuli as both unconditioned and conditioned stimuli, which is an analog preparation of acquisition of social anxiety and reduction by exposure therapy. Sixty-four participants were randomly allocated to four groups (AAA, ABA, ABC, and AAB). They received 9 pairings with a natural face and a negative comment during the acquisition phase and then received 18 pairings with the same face and a neutral comment from the person in the extinction phase. Following extinction, the testing phase was conducted. Context, defined as background colors, used in each phase was different between groups. We conducted two analyses, the ANOVA and Bayesian modeling, to investigate whether three types of renewal effects occur, whether the individual data can be described by an associative model and whether individual differences in learning are related to social anxiety. The ANOVA showed the occurrence of three renewals in the procedure, although the size of their effects was the same. The Bayesian modeling indicated that individual data were generally consistent with the model, and there were some relationships among the estimated parameters and between their parameters and social anxiety. These findings suggest that the relapse following exposure therapy is related to renewal effects, the effect of each exposure session can be represented by mathematical associative models, and some features of learning in the procedure are related to other features and social anxiety.

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