Impact of hypolimnetic oxygenation on profundal macroinvertebrates in a eutrophic lake in central Alberta. II. Changes in Chironomus spp. abundance and biomass

Effects of hypolimnetic oxygenation on profundal (15-25 m depth) Chironomus spp. in double-basined Amisk Lake were studied from 1988 to 1991. Responses were species specific. Mean densities and biomasses of C. anthracinus at 25 m increased 55- and 109-fold, respectively, in the treated north basin over the study period. Densities also increased in the reference south basin, but mean larval weights and biomasses were significantly lower than in the treated basin (P < 0.001). Anoxic conditions in the hypolimnion (dissolved oxygen concentrations <1 mg ·L-1), rather than low hypolimnetic temperatures, appeared to limit C. anthracinus distribution in Amisk Lake. Major changes in C. anthracinus abundance were not apparent until 2 years after the treatment commenced. Densities and biomasses of C. cucini were higher in the reference basin than in the treated basin of Amisk Lake. Densities of the C. decorus and C. plumosus groups increased in the treated basin but remained of minor importance. In comparison, densities of the C. cucini and C. plumosus groups at 25 m in the reference south basin of nearby Baptiste Lake declined over the study period. Increased profundal Chironomus spp. abundance in Amisk Lake suggested an increase in potential fish food.

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Impact of hypolimnetic oxygenation on profundal macroinvertebrates in a eutrophic lake in central Alberta. I. Changes in macroinvertebrate abundance and diversity

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/f97-122 ◽

1997 ◽

Vol 54 (9) ◽

pp. 2157-2169 ◽

Cited By ~ 9

Author(s):

W P Dinsmore ◽

E E Prepas

Keyword(s):

Dissolved Oxygen ◽

Water Temperature ◽

Eutrophic Lake ◽

Water Bodies ◽

Macroinvertebrate Communities ◽

South Basin ◽

The North ◽

Hypolimnetic Oxygenation ◽

Abundance And Diversity ◽

The Impact

Hypolimnetic oxygenation from 1988 to 1991 in the north basin of Amisk Lake increased mean summer (June-August) dissolved oxygen (DO) concentrations in the deep hypolimnion (25 m) from <0.4 mg ·L-1 during pretreatment years (1980-1987) to 2.7 mg ·L-1 during treatment. Mean summer hypolimnetic temperatures at 25 m also increased from 6.3 (pretreatment) to 8.1°C (treatment). Profundal (15-25 m) Chironomus spp. abundance in the treated basin increased from <100 to >2000 ·m-2 from 1988 to 1991 whereas Chaoborus spp., Tubificidae, and other taxa remained uncommon at similar depths. Shannon-Weaver indices of diversity decreased as oxygenation progressed, in contrast with previous studies. Similar patterns in densities and diversity were observed in the south basin of Amisk Lake, although the increase in DO concentrations was smaller relative to the north basin. The impact of increased water temperature on macroinvertebrates appeared minor relative to the effects of increased DO concentrations. No changes in macroinvertebrate communities were noted in a nearby reference lake during the study period. Responses to hypolimnetic oxygenation in Amisk Lake differed markedly from those reported for smaller, single-basined water bodies.

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Increased abundance and depth distribution of pelagic crustacean zooplankton during hypolimnetic oxygenation in a deep, eutrophic Alberta lake

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/f97-121 ◽

1997 ◽

Vol 54 (9) ◽

pp. 2146-2156 ◽

Cited By ~ 9

Author(s):

K M Field ◽

E E Prepas

Keyword(s):

Dissolved Oxygen ◽

Surface Waters ◽

Depth Distribution ◽

Daphnia Pulex ◽

Crustacean Zooplankton ◽

Bosmina Longirostris ◽

South Basin ◽

The North ◽

Hypolimnetic Oxygenation ◽

Species Specific

Since June 1988, the north basin of eutrophic Amisk Lake has been treated by hypolimnetic oxygenation, while the south basin has served as a reference. In summer 1989, hypolimnetic dissolved oxygen (DO) concentrations were >=>1 mg ·L-1 in the treatment basin, while they fell to <1 mg ·L-1 in the reference basin by early July. There were no apparent treatment effects on biomass, abundance, or distribution of zooplankton in surface waters (0-10 m). However, in summer 1989, hypolimnetic abundances of two of four species (Daphnia longiremis and Daphnia pulex) were greater in the treatment than in the reference basin (P < 0.03) and than in the north basin in summer 1984 (4 years pretreatment). In the hypolimnion, D. longiremis, D. pulex, Bosmina longirostris, and Diacyclops bicuspidatus thomasi were found at greater median depths (P < 0.001) in the treatment than in the reference basin. Median depths of these four species in the hypolimnion tracked species-specific DO concentrations of between 1.5 and 2.3 mg ·L-1. Coincident with enhanced DO concentrations in the treatment basin in August, D. longiremis migrated vertically in the treatment basin (median depth day versus night, P < 0.001, median migration 4 m), but not in the reference basin (P > 0.9).

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Effects of Global Warming on Critical Dissolved Oxygen Concentrations and on DO Sag Curve in the Nile River

International Conference on Biological, Civil and Environmental Engineering (BCEE-2014) March 17-18, 2014 Dubai (UAE) ◽

10.15242/iicbe.c0314030 ◽

2014 ◽

Keyword(s):

Global Warming ◽

Dissolved Oxygen ◽

Nile River ◽

Oxygen Concentrations

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A New Life for the St. Croix River

Water Quality Research Journal ◽

10.2166/wqrj.1988.044 ◽

1988 ◽

Vol 23 (4) ◽

pp. 568-577

Author(s):

Harold S. Bailey

Keyword(s):

Water Quality ◽

Dissolved Oxygen ◽

Discharge Rate ◽

Paper Mill ◽

Regulated River ◽

Secondary Treatment ◽

Pulp And Paper Mill ◽

Oxygen Regime ◽

Oxygen Concentrations

Abstract The water quality of the upper 110 kilometres of the St. Croix River is considered to be pristine. A major industrial discharge renders the lower 14 kilometres of the river a water quality limited segment. Prior to 1970 the Georgia-Pacific Pulp and Paper Mill at Woodland, Maine, discharged untreated effluent directly into the river causing dissolved oxygen concentrations to drop well below 5 mg/L, the objective chosen in the interest of restoring endemic fish populations. Since 1972, the Mill has installed primary and secondary treatment, regulated river discharge rate and effluent composition which has greatly improved the summer dissolved oxygen regime. By 1980, dissolved oxygen concentrations were generally above 5.0 mg/L and restocking the river with Atlantic Salmon (Salmo salar) was initiated.

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Species-specific isotope tracking of mercury uptake and transformations by pico-nanoplankton in an eutrophic lake

Environmental Pollution ◽

10.1016/j.envpol.2021.117771 ◽

2021 ◽

pp. 117771

Author(s):

Thibaut Cossart ◽

Javier Garcia-Calleja ◽

Isabelle A.M. Worms ◽

Emmanuel Tessier ◽

Killian Kavanagh ◽

...

Keyword(s):

Eutrophic Lake ◽

Mercury Uptake ◽

Species Specific

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Enhanced human lysozyme production by Pichia pastoris via periodic glycerol and dissolved oxygen concentrations control

Applied Microbiology and Biotechnology ◽

10.1007/s00253-021-11100-9 ◽

2021 ◽

Vol 105 (3) ◽

pp. 1041-1050

Author(s):

Luqiang Jia ◽

Teng Li ◽

Yixuan Wu ◽

Chunsen Wu ◽

Huaxiang Li ◽

...

Keyword(s):

Pichia Pastoris ◽

Dissolved Oxygen ◽

Human Lysozyme ◽

Oxygen Concentrations

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Hypoxic tolerance of Chinese black sleeper Bostrichthys sinensis embryos at heartbeat stage

Journal of the Marine Biological Association of the United Kingdom ◽

10.1017/s0025315406014548 ◽

2006 ◽

Vol 86 (6) ◽

pp. 1473-1476 ◽

Cited By ~ 1

Author(s):

Shixi Chen ◽

Wanshu Hong ◽

Wei Zhou ◽

Qiyong Zhang

Keyword(s):

Dissolved Oxygen ◽

Exposure Time ◽

Hypoxic Conditions ◽

Hypoxic Tolerance ◽

Heartbeat Rate ◽

Bostrichthys Sinensis ◽

Oxygen Concentrations

Tolerance of hypoxia in Chinese black sleeper (Bostrichthys sinensis) embryos at heartbeat stage was examined at different oxygen concentrations. Embryonic response to hypoxic conditions was expressed in terms of the intensity of variation in heartbeat rate (V). Exposure of the embryos at 25°C to 0.5, 1.0 and 1.5 mg/l dissolved oxygen (DO), caused bradycardia, which was developed within the first 10 min of hypoxia, followed by a plateau, and lasted until termination of the hypoxia. The V values were significantly affected by DO concentrations (P<0.01). Exposure of the embryos to 0.2 mg/l DO at 25°C caused a periodic heartbeat (including a period of heartbeat and a period of silence). This phenomenon was first recorded in the present study. During the period of heartbeat, the heartbeat rates were faster at first (147±5 beats per min), and then decreased gradually until the period of silence. As the exposure time increased, the duration of heartbeat was prolonged significantly from 43.4±2.4 second to 126.2±8.2 second (P<0.01), and the duration of silence was also prolonged significantly from 68.0±5.5 second to 247.9±11.5 second (P<0.01). At the beginning of exposure, the primary heartbeat rates displayed tachycardia, and their V values were significantly lower than the V values of average heartbeat rates (P<0.05). However, the V values were not significantly different between primary heartbeat rate and average heartbeat rate after 90 min exposure (P>0.05).

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