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• W2093049511 abstract "Quantitative paleolimnological inferences of diatom-inferred total phosphorus and chironomid-inferred hypolimnetic oxygen levels (measured as the anoxic factor) were compared along with historical records for Gravenhurst Bay, Ontario, prior to and following sewage treatment. Water quality declined dramatically following Euro- pean settlement in the mid-1800s and reached its highest inferred nutrient concentrations during the first half of the twentieth century. After treatment of sewage began in 1972, surface water total phosphorus rapidly returned to near oligotrophic conditions. Diatom assemblages reflected the period of nutrient enrichment, as well as the subsequent re - covery. Chironomid assemblages exhibited trends consistent with decreased availability of dissolved oxygen to deep- water habitats since ca. 1886, with profundal taxa being largely absent since ca. 1958 when deepwater anoxia became more severe. Despite remediation efforts, Gravenhurst Bay still experiences long periods of anoxia, and chironomid as- semblages have shown no sign of recovery to the improved surface water quality. We suggest that chironomid assem- blages responded more strongly to changes in deepwater oxygen availability than to epilimnetic nutrient concentrations, especially during periods of pronounced hypoxia. This study demonstrates the advantages of using both chironomids and diatoms in paleolimnological assessments of eutrophication, as the indicators track changes in different lake strata. Resume : On a compare des inferences paleolimnologiques quantitatives des concentrations de phosphore total (PT), etablies a partir des assemblages de diatomees, et des niveaux d'oxygene (refletes par le facteur anoxique, FA), etablies a partir des assemblages de chironomides, avec des donnees historiques pour la baie Gravenhurst (Ontario) recueillies avant et apres traitement des eaux usees. La qualite de l'eau a grandement diminue apres l'etablissement des popula- tions d'origine europeenne dans cette region au milieu du XIX e siecle, les concentrations de nutriants y ayant culmine selon nos inferences durant la premiere moitie du XX e siecle. Apres l'instauration du traitement des eaux usees en 1972, les concentrations de PT dans les eaux de surface ont diminue pour revenir a des niveaux correspondant presque a ceux d'un milieu oligotrophe. Les assemblages de diatomees refletaient la periode d'enrichissement en nutriants, ainsi que le retablissement subsequent. Les tendances des assemblages de chironomides refletaient la reduction des concen- trations d'oxygene dans les habitats profonds a partir d'environ 1886, les taxons vivant en eau profonde etant large - ment absents a partir d'environ 1958, annee ou l'anoxie en profondeur est devenue plus marquee. Malgre les efforts de restauration, i lyae udans la baie Gravenhurst de longues periodes d'anoxie, et les assemblages de chironomides n'ont montre aucun signe de retablissement malgre l'amelioration de la qualite des eaux de surface. Nous pensons que les assemblages de chironomides sont plus sensibles aux changements dans les concentrations d'oxygene en eau profonde qu'aux concentrations des nutriants dans l'epilimnion, particulierement durant les periodes d'hypoxie marquee. Cette etude montre l'utilite d'utiliser a la fois les chironomides et les diatomees dans les evaluations paleolimnologiques de l'eutrophisation, ces indicateurs rendant compte des changements dans differentes strates des lacs." @default.
• W2093049511 created "2016-06-24" @default.
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• W2093049511 date "2000-01-01" @default.
• W2093049511 modified "2023-09-27" @default.
• W2093049511 title "Past trophic status and hypolimnetic anoxia during eutrophicaton and remediation of Gravenhurst Bay, Ontario: comparison of diatoms, chironomids, and historical records" @default.
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• W2093049511 doi "https://doi.org/10.1139/cjfas-57-2-333" @default.
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