Diel and Seasonal Changes of Dissolved Oxygen and pH in Relation to Community Metabolism of a Shallow Reservoir in Southeast Missouri

1987 ◽  
Vol 4 (1) ◽  
pp. 115-125 ◽  
Author(s):  
Glenn D. Wylie ◽  
John R. Jones
Keyword(s):  
Dissolved Oxygen ◽  
Seasonal Changes ◽  
Community Metabolism ◽  
Shallow Reservoir ◽  
Southeast Missouri

Studies of the hydrobiology of a tropical lake in north-western Queensland. II. Seasonal changes in thermal and dissolved oxygen characteristics

1980 ◽  
Vol 31 (5) ◽  
pp. 589 ◽  
Author(s):  
CM Finlayson ◽  
TP Farrell ◽  
DJ Griffiths
Keyword(s):  
Dissolved Oxygen ◽  
Water Column ◽  
Environmental Conditions ◽  
Seasonal Changes ◽  
Thermal Stratification ◽  
Oxygen Depletion ◽  
Tropical Lake ◽  
North Western

The stratification characteristics of Lake Moondarra (24�34'S.,139�35'E.), a man-made lake in north- western Queensland, have been studied. Evidence is presented that the lake approximates the warm polymictic type in which no persistent thermal stratification ever develops. During the cooler months, thermal stratification breaks down during the night; in the warmer months, the intense rainstorms prevent the establishment of a persistently stratified water column. The shallowness of the lake relative to its surface areaand the prevailing environmental conditions ensure that extensive periods of oxygen depletion do not develop in the water column. It is concluded that a strong and prolonged period of thermal stratification, with subsequent serious effects of the availability of dissolved oxygen in the deeper layers, would only arise if, in a particular year. there were no significant rainstorms.

Dissolved oxygen in the Dead Sea— seasonal changes during the holomictic stage

1993 ◽  
Vol 2 (2) ◽  
pp. 93-110 ◽  
Author(s):  
Michal Shatkay ◽  
David A. Anati ◽  
Joel R. Gat
Keyword(s):  
Dissolved Oxygen ◽  
Seasonal Changes ◽  
Dead Sea ◽  
The Dead

scholarly journals MODELO MATEMÁTICO DEL ECOSISTEMA DE LA CIÉNAGA GRANDE DE SANTA MARTA

2016 ◽  
Vol 32 ◽  
Author(s):  
Yuri S. Tuchkovenko ◽  
Luis Alfredo Calero
Keyword(s):  
Mathematical Model ◽  
Organic Matter ◽  
Spatial Distribution ◽  
Dissolved Oxygen ◽  
Coastal Lagoon ◽  
Two Dimensional ◽  
Balance Equations ◽  
Dead Organic Matter ◽  
Shallow Reservoir ◽  
Nitrite Nitrate

The structure of the chemical – biological block of two-dimensional mathematical model of ecosystem and shallow reservoir and his methods of calibration is described in detail. The model includes the balance equations for the following components of ecosystem: phytoplankton, bacteria, zooplankton, dead (organic) matter, phosphate, ammonium, nitrite, nitrate and dissolved oxygen. Results of calculations of spatial distribution of several components of the ecosystem for the Ciénaga Grande de Santa Marta coastal lagoon (Colombia) in various seasons of year are given.

scholarly journals Environmental Study of Some Water Characteristics at Um-Al-Naaj Marsh, South of Iraq.

2011 ◽  
Vol 8 (1) ◽  
pp. 531-538
Author(s):  
Baghdad Science Journal
Keyword(s):  
Electrical Conductivity ◽  
Dissolved Oxygen ◽  
Seasonal Changes ◽  
Suspended Solids ◽  
Total Suspended Solids ◽  
Environmental Study ◽  
Light Penetration ◽  
Negative Effects ◽  
Water Characteristics ◽  
Water Ph

Um-Al-Naaj region in Al-Hawiezah Marsh, Southern Iraq was chosen to study the environmental variations of some water characteristics during 2008, seasonally. The results showed clear seasonal changes in values of some environmental variables (temperature, depth, light penetration, turbidity, total suspended solids, pH, dissolved oxygen, reactive phosphate, reactive nitrite, and reactive nitrate), while there were no clear seasonal changes in electrical conductivity and salinity values. In addition, high nutrients concentrations and light penetration were noted. Statistical analysis showed significant positive relationship between air and water temperature; electrical conductivity and salinity. Water turbidity was significantly affected by total suspended solids. On the other hand, some of the studied variables had significant negative effects (relative relationships) to each other, when water pH and dissolved oxygen were affected by temperature; total suspended solids and turbidity affected also light penetration.

scholarly journals The Spatial Distribution of Perch (Perca fluviatilis) Ectoparasites and the Effect of Chemical Water Quality Parameters on Ectoparasite Spatial Niche Size

2018 ◽  
Vol 72 (4) ◽  
pp. 236-243
Author(s):  
Maksims Zolovs ◽  
Madara Priekule ◽  
Olesia Gasperovich ◽  
Jelena Kolesnikova ◽  
Sergejs Osipovs ◽  
...  
Keyword(s):  
Water Quality ◽  
Dissolved Oxygen ◽  
Seasonal Changes ◽  
Perca Fluviatilis ◽  
Quality Parameters ◽  
Water Quality Parameters ◽  
Infection Prevalence ◽  
Anodonta Cygnea ◽  
Negatively Associated ◽  
Spatial Niche

Abstract Seasonal changes of abiotic factors and their influence on parasite occurrence have repeatedly been studied. Most of the studies have been conducted to evaluate the effect of water physicochemical parameters on changes in the intensity of infection, prevalence and component community of a number of parasite species. However, insufficient attention has been paid to the link between water quality parameters and spatial niche size of ectoparasites. The distribution of ectoparasite species on perch (Perca fluviatilis L.) was studied to establish whether seasonal changes of water quality parameters are associated with ectoparasite spatial niche size. The concentration of phosphates (PO43−), nitrates (NO−3), sulphates (SO42−) and dissolved oxygen (DO) in the water of Lake Sila (Latvia) was measured every month throughout the year and recorded all ectoparasites on perch. Zero-inflated mixed models were used to evaluate which of the water parameters influence the spatial niche size of ectoparasites. Our findings showed that spatial niche size of some ectoparasite species is affected by a set of water quality parameters and that this effect is negative. The spatial niche size of Anodonta cygnea was negatively associated with phosphate, nitrate, sulphate and dissolved oxygen concentration. The spatial niche size of Ancyrocephalus percae was negatively associated with sulphate, and the spatial niche size of Ergasilus sieboldi was negatively associated with nitrate concentration.

Seasonal fauna of some ephemeral saline waters in westren Victoria with particular reference to Parartemia zietziana Sayce (Crustacea: Anostraca)

1976 ◽  
Vol 27 (1) ◽  
pp. 1 ◽  
Author(s):  
NC Geddes
Keyword(s):  
Dissolved Oxygen ◽  
High Temperatures ◽  
Seasonal Changes ◽  
Saline Lakes ◽  
Resting Eggs ◽  
Physical Chemical ◽  
Saline Waters ◽  
Juvenile Stages ◽  
Biological Aspects ◽  
Western Victoria

Seasonal changes in physical, chemical and biological aspects of 16 ephemeral saline lakes in the Lake Corangamite district of western Victoria were studied. High temperatures, high salinities and low dissolved oxygen levels were recorded in the summer months. The less saline lakes contained a halophilic fauna which included Branchinella compacta, Daphniopsis pusilla, Boeckella triarticulata and Mesochra sp. In the more saline lakes, where salinity did not fall below 40%, at any time during the year, a truly halobiont fauna was present consisting of Parartemia zietziana, Calamoecia salina, C. clitellata, Microcyclops arnaudi, Australocypris robusta, Diacypris sp, and Platycypris sp. The occurrence of these halobiont species appeared to be controlled by salinity, new upper salinity records showing that all these species tolerate salinities well in excess of 100‰. Autecological studies on P. zietziana showed that development proceeded through 15 juvenile stages. Both subitaneous and resting eggs were produced with salinity being the controlling factor. Resting eggs hatched in response to a salinity drop over an approximate range of salinities of 50-200‰. In many populations development of the juveniles was retarded in stages 12-14. The length of adults was found to vary inversely with salinity. The occurrence of P. zietziana is discussed and it is concluded that the species occurs only in highly saline, astatic localities.

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