Temperature Preference and Distribution of Juvenile Arctic Grayling (Thymallus Arcticus) in the Williston Watershed, British Columbia, Canada PDF Download
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Author: Sarah C. F. Hawkshaw
Publisher:
ISBN:
Category : Arctic grayling
Languages : en
Pages : 0
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Book Description
"The habitat requirements of juvenile Arctic grayling (Thymallus arcticus) were assessed in the Williston watershed, British Columbia, where the population is currently red-listed (critically imperiled). Temperature preferences of juvenile Arctic grayling was assessed behaviorally using a shuttlebox system, and an information theoretic approach analysis of logistic regression models was used to evaluate the influence of environmental factors on the distribution of juvenile Arctic grayling throughout the Williston watershed. Temperature preference of juvenile Arctic grayling did not vary between the two tributaries in the watershed (p = 0.77) and the average preferred temperature was 16.84 ± 0.66 °C (n = 28). Comparisons of the preferred temperature to ambient water temperatures suggested that juvenile Arctic grayling will avoid areas where maximum water temperature is above the preferred temperature. There was a positive association between juvenile Arctic grayling occurrence and stream order (SO) and stream order multiplied by distance from the Williston reservoir (SDRxSO), as well as a negative association with the mean daily water temperature variance (varT) and average water temperature (aveT). Overall these findings suggest that large river systems are important juvenile Arctic grayling habitat and management decision should be made to ensure protection of this habitat throughout the range of this species."--P. ii.
Author: Sarah C. F. Hawkshaw
Publisher:
ISBN:
Category : Arctic grayling
Languages : en
Pages : 0
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Book Description
"The habitat requirements of juvenile Arctic grayling (Thymallus arcticus) were assessed in the Williston watershed, British Columbia, where the population is currently red-listed (critically imperiled). Temperature preferences of juvenile Arctic grayling was assessed behaviorally using a shuttlebox system, and an information theoretic approach analysis of logistic regression models was used to evaluate the influence of environmental factors on the distribution of juvenile Arctic grayling throughout the Williston watershed. Temperature preference of juvenile Arctic grayling did not vary between the two tributaries in the watershed (p = 0.77) and the average preferred temperature was 16.84 ± 0.66 °C (n = 28). Comparisons of the preferred temperature to ambient water temperatures suggested that juvenile Arctic grayling will avoid areas where maximum water temperature is above the preferred temperature. There was a positive association between juvenile Arctic grayling occurrence and stream order (SO) and stream order multiplied by distance from the Williston reservoir (SDRxSO), as well as a negative association with the mean daily water temperature variance (varT) and average water temperature (aveT). Overall these findings suggest that large river systems are important juvenile Arctic grayling habitat and management decision should be made to ensure protection of this habitat throughout the range of this species."--P. ii.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 15
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Book Description
This report describes & presents results of a field program carried out in 2000 on rivers in the Williston Reservoir watershed of British Columbia to gather information on Arctic grayling. The program included beach seine sampling of grayling juveniles along the Parsnip River and underwater counts at index sites along the Table & Anzac rivers to obtain estimates of grayling adults. Results related to the distribution & relative abundance of Arctic grayling are compared to those of a similar program conducted in 1998.
Author: Northcote, T. G
Publisher: Province of British Columbia, Ministry of Environment, Lands and Parks, Fisheries Branch
ISBN: 9780772621207
Category : Arctic grayling
Languages : en
Pages : 69
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 54
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Book Description
This report describes a 1998 study of Arctic grayling life history & habitat utilization on three rivers in the Williston Reservoir watershed of British Columbia. Introductory sections describe the study area (the Table River, Anzac River, and the 25-kilometre section of the Parsnip River between the Table & Anzac rivers) and methodology. The research included collection of water temperature data, an egg deposition survey, fry distribution surveys, sampling of young of the year, sampling of suitable habitats, mark recapture studies, and collection of biological information from sampled grayling. Results are presented & discussed with regard to water temperature trends, abundance & distribution of grayling fry, fish density, habitat utilization, characteristics of suitable habitats, abundance of adult grayling & other sport fish (trout, whitefish), age class distribution of grayling, and juvenile growth rates. Based on the findings, management implications & research needs are discussed.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 45
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Book Description
As part of ongoing investigations to determine the status of Arctic grayling in the Williston watershed in northern British Columbia, a large tributary stream of the Williston Reservoir was examined to determine Arctic grayling distribution, relative abundance, and habitat use. This report presents findings of electrofishing surveys that looked for the presence of Arctic grayling in the Ingenika River watershed. Observations of grayling fry habitat use are compared to studies conducted on other rivers in the Williston watershed. Results are also presented from angling surveys that collected information on adult grayling distribution.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 25
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Book Description
As part of ongoing investigations to determine the status of Arctic grayling in the Williston watershed in northern British Columbia, two large tributary streams of the Williston Reservoir were examined to determine Arctic grayling distribution, relative abundance, and habitat use. This report presents findings of electrofishing surveys that looked for the presence of Arctic grayling in the Omineca and Osilinka rivers. Observations of grayling fry habitat use are compared to studies conducted on the Table & Anzac rivers in the Parsnip River drainage of the Williston watershed. Results are also presented from angling surveys that collected information on adult grayling distribution.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 39
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Book Description
This publication summarizes information on Arctic grayling in the Williston Reservoir watershed of British Columbia. It begins with a chronological outline of Arctic grayling research in the watershed including inventories, stream fertilization, habitat enhancement, stocking, life history & genetic studies, and radio tracking. It then provides a synthesis in outline form of Arctic grayling data from Williston watershed projects & from the published literature under the following headings: reproduction, early rearing, habitat utilization, migrations, food, age & growth, and genetics. This is followed by discussion of the potential factors that limit the Arctic grayling population in the Reservoir, such as food & habitat availability, predation, egg & fry mortalities, competition, and overfishing. Finally, recommendations are made to prevent further declines in the Arctic grayling population, enhance or restore production from existing populations, and determine if & how stocks can be reintroduced into historical habitats.
Author: Geoffrey a McMichael
Publisher: Palala Press
ISBN: 9781341586064
Category :
Languages : en
Pages : 46
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Book Description
This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work.As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.
Author: Geoffrey A. McMichael
Publisher: Legare Street Press
ISBN: 9781017475784
Category : History
Languages : en
Pages : 0
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Book Description
This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.
Author: G. A. (George Alan) Butcher
Publisher:
ISBN: 9780771988264
Category : Arctic grayling
Languages : en
Pages : 39
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Book Description
Describes aspects of arctic grayling biology, as revealed during a 1980 synoptic fisheries survey along the proposed route of the Alaska Highway Gas Pipeline in British Columbia, and mentions potential impacts.
