Zoobenthos of Fifteen Lakes in the Experimental Lakes Area, Northwestern Ontario

1971 ◽  
Vol 28 (2) ◽  
pp. 257-263 ◽  
Author(s):  
Andrew L. Hamilton
Keyword(s):  
Dissolved Oxygen ◽  
Dominant Species ◽  
Bottom Water ◽  
Individual Species ◽  
Lake Morphometry ◽  
Dissolved Oxygen Concentration ◽  
Experimental Lakes Area ◽  
Northwestern Ontario ◽  
Morphometric Features ◽  
The Individual

The composition of the profundal and sublittoral zoobenthos of 15 lakes in northwestern Ontario was closely related to morphometric features of the individual lakes. The amphipod Pontoporeia affinis Lind., and the sphaeriid Pisidium conventus Clessin, were the dominant species in the larger deeper lakes whereas species of Chironomidae and Chaoborinae were the dominant forms in all lakes with mean depths of less than 10 m. Dissolved oxygen concentration and temperature of the bottom water, two characteristics that are largely a function of lake morphometry, are probably the primary factors limiting the distribution of individual species.

scholarly journals Detection of low bottom water oxygen concentrations in the North Sea; implications for monitoring and assessment of ecosystem health

2009 ◽  
Vol 6 (4) ◽  
pp. 8411-8453 ◽  
Author(s):  
N. Greenwood ◽  
E. R. Parker ◽  
L. Fernand ◽  
D. B. Sivyer ◽  
K. Weston ◽  
...  
Keyword(s):  
Dissolved Oxygen ◽  
Oxygen Concentration ◽  
North Sea ◽  
Mixed Layer ◽  
Ecosystem Health ◽  
Bottom Water ◽  
Dissolved Oxygen Concentration ◽  
The North ◽  
The North Sea ◽  
Oxygen Concentrations

Abstract. This paper presents new results from high temporal resolution observations over two years (2007 and 2008) from instrumented moorings deployed in the central North Sea, at the Oyster Grounds and on the northern slope of Dogger Bank (North Dogger). The water column was stratified in the summer at both sites, leading to limited exchange of the water in the bottom mixed layer. Data from these moorings revealed the variable nature of summer oxygen depletion at the Oyster Grounds. The combination of in situ and ship-based measurements allowed the physical and biological conditions leading to decreasing dissolved oxygen concentrations in bottom water to be examined. The concentration of dissolved oxygen in the bottom water at both sites was observed to decrease throughout the summer period after the onset of stratification. Depleted dissolved oxygen concentration (6.5 mg l−1, 71% saturation) was measured at the North Dogger, a site which is not significantly influenced by anthropogenic nutrient inputs. Lower oxygen saturation (5.2 mg l−1, 60% saturation) was measured for short durations at the Oyster Grounds. Increasing bottom water temperature accounted for 55% of the decrease in dissolved oxygen concentration at the Oyster Grounds compared to 10% at North Dogger. Dissolved oxygen concentration in bottom water at the Oyster Grounds was shown to be strongly influenced by short term events including storm events and pulses of biomass input. In contrast, dissolved oxygen concentration in bottom water at the North Dogger reflected longer seasonal processes such as gradual temperature increases and a more steady supply of biomass to the bottom mixed layer. The differences between the study sites shows the need for an improved understanding of the mechanisms driving these processes if the use of oxygen in marine management and ensuring ecosystem health is to be meaningful and successful in the future. These observations provide greater understanding of the nature of the depletion in bottom oxygen concentration in the North Sea.

scholarly journals Detection of low bottom water oxygen concentrations in the North Sea; implications for monitoring and assessment of ecosystem health

2010 ◽  
Vol 7 (4) ◽  
pp. 1357-1373 ◽  
Author(s):  
N. Greenwood ◽  
E. R. Parker ◽  
L. Fernand ◽  
D. B. Sivyer ◽  
K. Weston ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Oxygen ◽  
Oxygen Concentration ◽  
North Sea ◽  
Particulate Organic Matter ◽  
Ecosystem Health ◽  
Bottom Water ◽  
Dissolved Oxygen Concentration ◽  
The North ◽  
The North Sea

Abstract. This paper presents new results from high temporal resolution observations over two years (2007 and 2008) from instrumented moorings deployed in the central North Sea, at the Oyster Grounds and on the northern slope of Dogger Bank (North Dogger). The water column was stratified in the summer at both sites, leading to limited exchange of the water in the bottom mixed layer. Data from these moorings revealed the variable nature of summer oxygen depletion at the Oyster Grounds. The combination of in situ and ship-based measurements allowed the physical and biological conditions leading to decreasing dissolved oxygen concentrations in bottom water to be examined. In 2007 and 2008, the concentration of dissolved oxygen in the bottom water at both sites was observed to decrease throughout the summer period after the onset of stratification. Depleted dissolved oxygen concentration (6.5 mg l−1, 71% saturation) was measured at the North Dogger, a site which is not significantly influenced by anthropogenic nutrient inputs. Lower oxygen saturation (5.2 mg l−1, 60% saturation) was measured for short durations at the Oyster Grounds. The seasonal increase in bottom water temperature accounted for 55% of the decrease in dissolved oxygen concentration at the Oyster Grounds compared to 10% at North Dogger. Dissolved oxygen concentration in bottom water at the Oyster Grounds was shown to be strongly influenced by short term events including storms and pulses of particulate organic matter input. In contrast, dissolved oxygen concentration in bottom water at the North Dogger reflected longer seasonal processes such as a gradual temperature increase over the summer and a more steady supply of particulate organic matter to the bottom mixed layer. The differences between the study sites shows the need for an improved understanding of the mechanisms driving these processes if the use of oxygen in marine management and ensuring ecosystem health is to be meaningful and successful in the future. These high frequency observations provide greater understanding of the nature of the depletion in bottom oxygen concentration in the North Sea.

Pelagic distribution of lake trout (Salvelinus namaycush) in small Canadian Shield lakes with respect to temperature, dissolved oxygen, and light

1998 ◽  
Vol 55 (1) ◽  
pp. 170-179 ◽  
Author(s):  
Todd J Sellers ◽  
Brian R Parker ◽  
David W Schindler ◽  
William M Tonn
Keyword(s):  
Light Intensity ◽  
Dissolved Oxygen ◽  
Lake Trout ◽  
Salvelinus Namaycush ◽  
Canadian Shield ◽  
Small Lakes ◽  
Experimental Lakes Area ◽  
Northwestern Ontario ◽  
Oxygenated Water ◽  
Shield Lakes

The distribution of lake trout (Salvelinus namaycush) with respect to water temperature, dissolved oxygen, and light intensity was surveyed in three small Canadian Shield lakes at the Experimental Lakes Area, northwestern Ontario. Based on hydroacoustic and gillnet surveys, there was considerable variation among lakes in temperatures occupied by lake trout during the summer. During the day, lake trout were concentrated at 4-8°C in Lake 375, broadly distributed from 6 to 15°C in Lake 442, and concentrated in the epilimnion at 19°C in Lake 468. At night, lake trout in all lakes occupied epilimnetic waters at 19-20°C. Lake trout inhabited highly oxygenated water, with 75-90% of fish at >6 mg dissolved oxygen ·L-1 throughout the spring and summer in all three lakes. Light intensity did not affect lake trout distribution in Lake 468 but may have contributed to lake trout daytime descent into cool waters in Lakes 375 and 442. We suggest that previously assumed niche boundaries of lake trout do not adequately describe critical habitat for the species in small lakes, the same lakes that are likely most sensitive to erosion of such habitat.

scholarly journals PENGAMATAN KUALITAS AIR UNTUK MENDUKUNG PERIKANAN DI WADUK CIRATA, JAWA BARAT

2017 ◽  
Vol 14 (2) ◽  
pp. 173 ◽  
Author(s):  
Sri Endah Purnamaningtyas ◽  
Didi Wahju Hendro Tjahjo
Keyword(s):  
Water Quality ◽  
Dissolved Oxygen ◽  
Sea Level ◽  
Water Samples ◽  
Bottom Water ◽  
Water Environment ◽  
Phosphate Concentration ◽  
Dissolved Oxygen Concentration ◽  
Territorial Water

Pengamatan kualitas air di Waduk Cirata (luas: 6.200 ha, rata-rata kedalaman (z):34,9 m, dan ketinggian 225 m dpl) dilakukan mulai bulan Maret sampai dengan Desember 2006. Penelitian ini bertujuan untuk mengetahui kondisi lingkungan perairan Waduk Cirata dalam mendukung kegiatan perikanan. Penelitian dilakukan dengan metode survei dan pengambilan contoh air menggunakan kemmerer bottle sampler” Pengambilan contoh air dilakukan di 6 stasiun pengamatan dengan kedalaman 0,5; 2; 4,5; dan 8 m serta dasar perairan. Dari hasil pengamatan yang di peroleh selama penelitian menunjukkan bahwa kualitas air diWaduk Cirata cukup mendukung untuk kegiatan perikanan tangkap, seperti suhu berkisar antara 27,1 - 31,5°C, pH 6,5 - 8,5, O2 terlarut 0,44 - 4,72 mg per L, CO2 0 - 11,48 mg per L, N-NO2 0 - 0,259 mg per L, N-NO3 0,054 - 9,841 mg per L, NH4 0,0171 - 3,351 mg per L, NH3 0 - 3,17 mg per L, PO4 0,024 - 7,154 mg per L, dan total bahan organik 0 - 27,2 mg per L. Berdasarkan pada hasil dari analisis konsentrasi oksigen terlarut telah mengalami stratifikasi, dan klasifikasi tingkat kesuburan perairan berdasarkan pada konsentrasi fosfat, perairan ini sudah mencapai tingkat eutrofik dan hipereutrofik. Hal tersebut, berarti usaha pengembangan budi daya ikan dalam karamba jaring apung telah melebihi daya dukung perairan dan cenderung telah mencemari perairan. Observation of water quality was done in Cirata Reservoir (area: 6,200 ha, dept mean (z):34.9 m, and altitude 225 m above sea level) from March to December 2006. This research aimed to know the condition of water environment of Cirata Reservoir to support fisheries activities. The research was done using method of survey. Water samples was collected using kemmerer bottle sampler in 6 station sites at a depth of 0.5; 2; 4.5; 8 m and bottom water, respectively. The result indicated that the water quality of Cirata Reservoir was good enough for supporting t fisheries activities, namely water temperature 27.1 - 31.5°C, pH 6.5 to 8.5, DO 0.44- 4.72 mg per L, free CO2 0 - 11.48 mg per L, N-NO2 0 - 0.259 mg per L, N-NO3 0.054 - 9.841 mg per L, NH4: 0.0171 - 3.351 mg per L, NH3 0 - 3.17 mg per L, PO4 0.024 - 7.154 mg per L, organics materials 0 - 27.2 mg per L. Dissolved oxygen concentration stratification was observed, and classification mount fertility of territorial water of its phosphate concentration, this territorial water have reached storey; level of eutrofik and hipereutrofik. The mentioned mean the effort development of fish conducting in net keramba float have exceeded energy support territorial water and tend to have contaminated territorial water.

Performance of temperature and dissolved oxygen criteria to predict habitat use by lake trout (Salvelinus namaycush)This paper is part of the series “Forty Years of Aquatic Research at the Experimental Lakes Area”.

2009 ◽  
Vol 66 (11) ◽  
pp. 2011-2023 ◽  
Author(s):  
John M. Plumb ◽  
Paul J. Blanchfield
Keyword(s):  
Habitat Use ◽  
Dissolved Oxygen ◽  
Thermal Stratification ◽  
Lake Trout ◽  
Salvelinus Namaycush ◽  
Experimental Lakes Area ◽  
Lake Volume ◽  
Northwestern Ontario ◽  
Environmental Extremes

We compared theoretical habitat volumes, determined from traditional combinations of temperature and dissolved oxygen concentration (DO) boundaries, with in situ habitat use by acoustically tagged lake trout ( Salvelinus namaycush ). The widely used criteria of 8–12 °C underestimated lake trout habitat use by 68%–80%. Instead, combined temperature (<12 or 15 °C) and DO (>4 or 6 mg·L–1) criteria most closely matched lake trout habitat use, had a similar seasonal trend as the tagged fish, suggested modest reductions (5% of total lake volume) in habitat during a warmer year, and performed best when the constraints of temperature and DO were most limiting. All data were collected in a small boreal shield lake (27 ha, zmax = 21 m) at the Experimental Lakes Area in northwestern Ontario, Canada, during two contrasting periods of thermal stratification (2003: warmer and longer; 2004: cooler and shorter), providing an assessment of observed and theoretical habitat volumes over current environmental extremes.

Quantification of Bottom Water Age by Using Temperature Based Age Index Model and Its Relationship with Bottom Water Dissolved Oxygen Concentration in Ise Bay, Japan

2019 ◽  
Vol 75 (2) ◽  
pp. I_1003-I_1008
Author(s):  
Muhammad Ali HAFEEZ ◽  
Yoshiyuki NAKAMURA ◽  
Tetsunori INOUE ◽  
Shinya HOSOKAWA ◽  
Yoshitaka MATSUZAKI
Keyword(s):  
Dissolved Oxygen ◽  
Oxygen Concentration ◽  
Bottom Water ◽  
Dissolved Oxygen Concentration ◽  
Water Age ◽  
Ise Bay ◽  
Index Model

scholarly journals Factors Affecting Macrobenthic Invertebrates Distribution in Badagry Creek, South Western Nigeria

2018 ◽  
pp. 1-11
Author(s):  
O. A. Olapoju ◽  
C. A. Edokpayi
Keyword(s):  
Dissolved Oxygen ◽  
Species Abundance ◽  
Individual Species ◽  
Chemical Parameters ◽  
Factors Affecting ◽  
Physico Chemical ◽  
Significant Difference ◽  
The Individual ◽  
Sand And Gravel ◽  
Physical And Chemical

The aim of the paper is to identify macroinvertebrates distribution in response to induced stressors and physico-chemical parameters of water and sediment. The species composition of macrobenthic invertebrates as well as the physico-chemical characteristics of Badagry creek was investigated monthly. Six sampling stations selected based on different levels of human activities along the creeks stretch and samples were collected monthly from September 2006 to February 2007. The fluctuations of some of the physical and chemical parameters such as pH, dissolved oxygen, BOD and total organic carbon appeared to have been influenced by activities along the study stretch. Analysis of variance (ANOVA)  for all parameters showed no significant differences (P > 0.05) in the parameters but  Post hoc tests analysis using Duncan showed that there was a significant difference (P = 0.05) in the mean total of some of the parameters. pH, clay, sand and gravel were significantly correlated with other parameters while canonical correspondence analysis (CCA) model showed that the environmental variables correlated with significant part of the variations in the individual species abundance and it revealed that dominant species were found to be significantly correlated with dissolved oxygen, total dissolved solids, sand and pH.

scholarly journals Relationship between dissolved oxygen concentration of bottom water and macrophyte biomass in the southern basin of Lake Biwa, Japan

2006 ◽  
Vol 67 (1) ◽  
pp. 23-27 ◽  
Author(s):  
Hiroki HAGA ◽  
Minako ASHIYA ◽  
Taisuke OHTSUKA ◽  
Masanari MATSUDA ◽  
Akihiro TUJI ◽  
...  
Keyword(s):  
Dissolved Oxygen ◽  
Oxygen Concentration ◽  
Bottom Water ◽  
Lake Biwa ◽  
Dissolved Oxygen Concentration ◽  
Southern Basin ◽  
Macrophyte Biomass

Eutrophication of Lake 227, Experimental Lakes Area, Northwestern Ontario, by Addition of Phosphate and Nitrate

1971 ◽  
Vol 28 (11) ◽  
pp. 1763-1782 ◽  
Author(s):  
D. W. Schindler ◽  
F. A. J. Armstrong ◽  
S. K. Holmgren ◽  
G. J. Brunskill
Keyword(s):  
Standing Crop ◽  
Dominant Species ◽  
Inorganic Nitrogen ◽  
Late Summer ◽  
Phytoplankton Production ◽  
Experimental Lakes Area ◽  
Algal Production ◽  
Ph Values ◽  
Northwestern Ontario ◽  
Nitrogen Concentrations

Addition of 0.34 g P as Na2HPO4 and 5.04 g N as NaNO3 per square meter to a small unproductive Canadian Shield lake over a period of 17 weeks caused a severalfold increase in phytoplankton standing crop, and a change in dominant species from Chrysophyceae to Chlorophyta. Reactive phosphate concentrations remained at undetectable levels in the epilimnion after fertilization, and inorganic nitrogen concentrations remained low. Most of the added phosphorus and nitrogen was rapidly taken up by phytoplankton and sedimented with the seston.Although concentrations of total CO2 decreased to less than 20 μmoles/liter and pH values increased to greater than 9 in late summer, a high standing crop of phytoplankton was maintained. No marked increase in the rate of phytoplankton production was noticed Experiments in polyethylene containers suspended in the lake during this period of low total CO2 indicated that carbon was not limiting to algal production, except possibly at algal standing crops in excess of 100 μg/liter chlorophyll a, and that phosphorus was the primary limiting nutrient.Sodium added with the nutrients remained in the epilimnion until fall overturn, indicating that very little of it was utilized by phytoplankton.

Synthesis of Reconfigurable Embedded System to Measure Temperature Compensated Dissolved Oxygen Concentration

2017 ◽  
Vol 7 (5) ◽  
pp. 592-597 ◽  
Author(s):  
S. K. Tilekar ◽  
◽  
P. V. Mane- Deshmukh ◽  
B. P. Ladgaonkar ◽  
S. V. Chavan ◽  
...  
Keyword(s):  
Dissolved Oxygen ◽  
Embedded System ◽  
Oxygen Concentration ◽  
Dissolved Oxygen Concentration
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