Notice bibliographique
Résumé
The Pacific coast of Canada is indented by numerous fjords. However, there has been no synoptic zooplankton study of a fjord in British Columbia, and little information is available to suggest how spatial and temporal distributions may change along a fjord's length in response to variation in hydrographic circulation, "water quality", and distribution of phytoplankton. The investigation reported here was designed to help fill this gap. The study area was Knight Inlet, a local glacial run-off fjord, partitioned by a sill into a shallow outer (200 m) and deep inner (500 m) basin. Ten cruises were made to the area between October 1974 and September 1975. Vertically discrete zooplankton hauls were taken over a standard depth range of approximately 16 km intervals along a transect from Queen Charlotte Strait to the fjord head. All observed calanoid copepods (the group which dominated the zooplankton) were counted at the species sexed copepodite level. Salinity, temperature, oxygen, nitrate, chlorophyll a, and suspended sediment data were collected concurrently and plotted as isopleth profiles, from which hydrographic circulation was deduced. The profiles, in combination with Temperature-Salinity diagrams, were also used to "partition" the fjord into geographically and vertically discrete "water regimes", each identifiable by a unique suite of conservative and non-conservative properties. All regimes were grouped into either a "Surface", "Transition" or "Deep" category. Dominant features of hydrographic circulation were the summer surface outflow of low salinity glacial run-off, and the replacement of deep waters by a high salinity intrusion associated, with upwelling. New intrusions resulted in up-inlet movement of previously resident waters, which were then uplifted and flushed down-inlet. This counter-current system of flows appeared to act as a nutrient trap, retaining within the inlet any biologically utilisable material, and leading to the accumulation of high nitrate concentrations in the inner basin. Monthly Temperature-Salinity-Plankton (T-S-P) diagrams showed that five copepod species groups could be recognised according to an apparent association with either one or two water regimes. They were named accordingly, "Summer Surface", "Surface and Surface Transitional", "Transitional/Deep", "Deep", and "Off-shore". A final group was designated "Migrant", and contained all diel and seasonal vertical migrants. Monthly profiles of species presence/absence, and profiles of conservative and non-conservative properties provided a spatial aspect to water regime-plankton associations revealed on the T-S-P diagrams. For example, most Transitional/Deep and all Deep species were clearly associated with the inner basin, whilst most Surface and Surface/ Transitional species appeared to be associated with the outer basin and Queen Charlotte Strait. This procedure also revealed the advection of groups into "unusual" locations or depth ranges. For example, when deep inner basin water regimes were uplifted, similar upward displacement of Deep species were observed. Similarly, copepods characteristic of an off-shore fauna were carried into Queen Charlotte Strait by the July intrusion, and small numbers were advected into the fjord outer basin. The breeding cycles of herbivorous copepods varied within species at different geographical localities. This appeared to reflect the almost complete disappearance of phytoplankton from the inner basin after the arrival of turbid glacial run-off into the fjord head from June until September. Deep species showed little seasonality in breeding cycle and a trend towards this situation was observed in the Transitional/ Deep group. In conclusion, this thesis describes temporal and spatial patterns of distribution for all ealanoid copepod species found in Knight Inlet, and attempts to relate these to fjord hydrography and the distributions of certain environmental properties.
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 | 0,001 |
| Études des sciences et des technologies | 0,001 | 0,001 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,001 | 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 ».