Past trophic status and hypolimnetic anoxia during eutrophicaton and remediation of Gravenhurst Bay, Ontario: comparison of diatoms, chironomids, and historical records. Little, J. L, Hall, R. I, Quinlan, R., & Smol, J. P Canadian Journal of Fisheries and Aquatic Sciences, 57(2):333–341, February, 2000. 00084![Past trophic status and hypolimnetic anoxia during eutrophicaton and remediation of Gravenhurst Bay, Ontario: comparison of diatoms, chironomids, and historical records [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper doi abstract bibtex 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 European 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 recovery. Chironomid assemblages exhibited trends consistent with decreased availability of dissolved oxygen to deepwater 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 chironom..., On a comparé des inférences paléolimnologiques quantitatives des concentrations de phosphore total (PT), établies à partir des assemblages de diatomées, et des niveaux d'oxygène (reflétés par le facteur anoxique, FA), établies à partir des assemblages de chironomides, avec des données historiques pour la baie Gravenhurst (Ontario) recueillies avant et après traitement des eaux usées. La qualité de l'eau a grandement diminué après l'établissement des populations d'origine européenne dans cette région au milieu du XIXe siècle, les concentrations de nutriants y ayant culminé selon nos inférences durant la première moitié du XXe siècle. Après l'instauration du traitement des eaux usées en 1972, les concentrations de PT dans les eaux de surface ont diminué pour revenir à des niveaux correspondant presque à ceux d'un milieu oligotrophe. Les assemblages de diatomées reflétaient la période d'enrichissement en nutriants, ainsi que le rétablissement subséquent. Les tendances des assemblages de chironomides reflétai...
@article{little_past_2000,
title = {Past trophic status and hypolimnetic anoxia during eutrophicaton and remediation of {Gravenhurst} {Bay}, {Ontario}: comparison of diatoms, chironomids, and historical records},
volume = {57},
issn = {0706-652X},
shorttitle = {Past trophic status and hypolimnetic anoxia during eutrophicaton and remediation of {Gravenhurst} {Bay}, {Ontario}},
url = {http://www.nrcresearchpress.com/doi/abs/10.1139/f99-235},
doi = {10.1139/f99-235},
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 European 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 recovery. Chironomid assemblages exhibited trends consistent with decreased availability of dissolved oxygen to deepwater 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 chironom..., On a comparé des inférences paléolimnologiques quantitatives des concentrations de phosphore total (PT), établies à partir des assemblages de diatomées, et des niveaux d'oxygène (reflétés par le facteur anoxique, FA), établies à partir des assemblages de chironomides, avec des données historiques pour la baie Gravenhurst (Ontario) recueillies avant et après traitement des eaux usées. La qualité de l'eau a grandement diminué après l'établissement des populations d'origine européenne dans cette région au milieu du XIXe siècle, les concentrations de nutriants y ayant culminé selon nos inférences durant la première moitié du XXe siècle. Après l'instauration du traitement des eaux usées en 1972, les concentrations de PT dans les eaux de surface ont diminué pour revenir à des niveaux correspondant presque à ceux d'un milieu oligotrophe. Les assemblages de diatomées reflétaient la période d'enrichissement en nutriants, ainsi que le rétablissement subséquent. Les tendances des assemblages de chironomides reflétai...},
number = {2},
urldate = {2018-06-11},
journal = {Canadian Journal of Fisheries and Aquatic Sciences},
author = {Little, Joanne L and Hall, Roland I and Quinlan, Roberto and Smol, John P},
month = feb,
year = {2000},
note = {00084},
keywords = {\#nosource},
pages = {333--341},
}
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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 recovery. Chironomid assemblages exhibited trends consistent with decreased availability of dissolved oxygen to deepwater 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 chironom..., On a comparé des inférences paléolimnologiques quantitatives des concentrations de phosphore total (PT), établies à partir des assemblages de diatomées, et des niveaux d'oxygène (reflétés par le facteur anoxique, FA), établies à partir des assemblages de chironomides, avec des données historiques pour la baie Gravenhurst (Ontario) recueillies avant et après traitement des eaux usées. La qualité de l'eau a grandement diminué après l'établissement des populations d'origine européenne dans cette région au milieu du XIXe siècle, les concentrations de nutriants y ayant culminé selon nos inférences durant la première moitié du XXe siècle. Après l'instauration du traitement des eaux usées en 1972, les concentrations de PT dans les eaux de surface ont diminué pour revenir à des niveaux correspondant presque à ceux d'un milieu oligotrophe. Les assemblages de diatomées reflétaient la période d'enrichissement en nutriants, ainsi que le rétablissement subséquent. 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