Pontoporeia and mysis in lakes of the Canadian northwest : a study of their ecology, biology and economic importance in Great Slave Lake and Lake Athabaska : including a re-evaluation of the theories of the origin of these species in fresh water lakes : a thesis submitted to the Committee on graduate studies in partial fulfilment of the requirements for the degree of Master of arts in the Department of biology, University of Saskatchewan
Notice bibliographique
Résumé
Since the middle of the last century, a considerable amount of scientific literature has been published on the so called “glacial marine relicts,” Mysis oculata var. relicta Lovan and Pontoporeia affinis Lindstrom. Intensive and extensive studies have been made of the ecology, natural history and distribution of these and similar forms, mostly with the object of establishing their relict nature. The discovery of these forms in a number of North American lakes has thrown considerable doubt on the validity of several of the theories of origin which have been postulated. At the same time, it has been recognized, that in the large and extremely oligotrophic lakes of North America, these forms are important elements in the food of such commercially important species as the whitefish, Coregonus clupeaformis, the ciscoes, Leucichthys spp. and the lake trout, Cristivomer namaycush. When the Fisheries Research Board undertook the investigation of the large lakes of the Canadian Northwest, a large amount of material for the study of these two forms was made available. Under the direction of Dr. D.S. Rawson, surveys on Great Slave Lake were conducted in the summers of 1944 and 1945, and on Lake Athabaska in 1945. The writer was a member of the Great Slave survey party in 1944, and of the Lake Athabasca party in 1945. Dr. R.B. Miller directed a survey of Great Bear Lake in 1945. Data from these surveys, together with data obtained by Dr. D. S. Rawson from a few other North American lakes, formed a substantial body of research material which served as a basis for this study. The purpose of this study, therefore, has been to investigate the ecology, biology and economic importance of Pontoporeia and Mysis in those lakes from which material was obtained, with particular reference to Great Slave Lake and Lake Athabasca. The records of distribution of Pontoporeia and Mysis in these lakes were not available to European workers, who published their scientific work in the early part of the century. For this reason the writer has also attempted to re-evaluate some of the theories of origin, concerning these species, which have been proposed by various European workers.
Récupéré en direct depuis OpenAlex et désinversé. Les résumés ne sont pas conservés dans cette base de données : les index inversés représentent 8,6 Go des 9,3 Go de texte de la base, et le serveur dispose de 13 Go libres.
Comment cette classification a été obtenuedéplier
Prédiction machine sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Le volet Gemma est une étiquette directe du modèle pour chaque travail de la base, lue sur la notice réduite au titre. Le volet Codex est un classifieur appris des 10 348 étiquettes directes de Codex et calibré sur les taux pondérés de l'échantillon; les champs sans appui suffisant ne portent aucun appel Codex. Le mode candidate est l'union des deux volets; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont pas des étiquettes humaines.
Scores du classifieur distillé par catégorie (deux têtes)
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,001 | 0,002 |
| Études des sciences et des technologies | 0,005 | 0,001 |
| Communication savante | 0,001 | 0,001 |
| Science ouverte | 0,001 | 0,001 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,002 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule source (Gemma direct ou Codex distillé), pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».