Examining Seasonality of Zooplankton Communities and Water Quality in Yellowknife Area Lakes, Northwest Territories
Notice bibliographique
Résumé
Frame Lake, located in Yellowknife, Northwest Territories, is one of the city's main attractions. Unfortunately, urbanization and eutrophication have led to a decline in water quality in the lake. Eutrophication has caused a buildup of organic matter in sediments on the bottom of the lake, which can cause a high oxygen demand when processed by aerobic bacteria. Dissolved oxygen levels are high during the summer, but ice shields the lake from gas exchange with the atmosphere, leading to winter anoxia. This oxygen depletion makes it impossible for sensitive aquatic life, such as fish, to survive in the lake over the winter. One possible solution to winter anoxia is to install a hypolimnetic aerator to exchange oxygen between the lake's deep layers and the atmosphere. Past studies show that aeration will improve dissolved oxygen levels, and it may help break down accumulated organic matter and reduce nutrient levels in the water column. As part of a remediation project funded by Rio-Tinto Diamond Mines, a hypolimnetic aerator will be installed on Frame Lake in early summer 2024. To evaluate the effects of the aerator installation on the lake, data on the natural variability in water quality and biota in Frame Lake and comparable lakes within the region is necessary.\nThe objectives for my thesis were to examine seasonal variability in water quality and zooplankton communities in Frame Lake and two reference lakes, and to examine the relationships between water quality and zooplankton communities in those lakes to assess if aeration might lead to chemical or biological improvements in Frame Lake. I collected monthly water quality and zooplankton samples from Frame Lake and two reference lakes between March 2022 – November 2024. My results showed seasonal fluctuations in pH, conductivity, and dissolved oxygen in my study lakes, and confirmed that Frame Lake experiences anoxia once the ice cover forms. In addition, nutrient and conductivity levels were higher in Frame Lake than in the two reference lakes. Zooplankton samples showed seasonal variation in richness, diversity, evenness, and abundance, with highs in the summer and lows under ice in the winter. In addition, the abundance of zooplankton in Frame Lake was significantly lower under ice in comparison with the two reference lakes. When examining correlations between zooplankton communities and water quality variables that may be influenced by aeration, I found that zooplankton abundance and richness increased with higher levels of dissolved oxygen and decreased with higher levels of total nitrogen. These findings suggest that the installation of a hypolimnetic aerator in Frame Lake is needed to improve oxygen levels in Frame Lake during the winter, and that it may improve conditions such that zooplankton abundance and richness increase. Ultimately, the chemical and biological improvements that may result from aeration could improve the suitability of Frame Lake for future fish reintroduction.
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Scores du classifieur distillé par catégorie (deux têtes)
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,001 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,001 |
| Études des sciences et des technologies | 0,001 | 0,000 |
| 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 ».