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Seasonal changes in the dissolved oxygen status of two tropical water storages
Author(s) -
Boland K. T.,
Griffiths D. J.
Publication year - 1995
Publication title -
lakes and reservoirs: research and management
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.296
H-Index - 39
eISSN - 1440-1770
pISSN - 1320-5331
DOI - 10.1111/j.1440-1770.1995.tb00026.x
Subject(s) - hypolimnion , water column , environmental science , chlorophyll a , oxygen , oxygen saturation , phytoplankton , environmental chemistry , hydrology (agriculture) , atmospheric sciences , oceanography , chemistry , geology , ecology , eutrophication , nutrient , biology , biochemistry , geotechnical engineering , organic chemistry
Seasonal changes in the dissolved oxygen characteristics of two tropical impoundments in north‐western Queensland are described. The lakes are compared in terms of their dissolved oxygen saturation deviation index (OSDI). In the deeper, more sheltered Lake Julius (20°08'S, 139°43.5′E) OSDI was positively correlated with vertical water column stability which explained ∼50% of the observed variation in OSDI. In the shallower, more exposed Lake Moondarra (20°35'S, 139°34.5′E) which, like Lake Julius experiences prolonged periods of hypolimnetic oxygen depletion, there was no significant correlation between OSDI and water column stability. It is concluded that in the considerably less stable Lake Moondarra, high OSDI values are maintained by the greater area of contact between the hypolimnion and sediment surface. In neither lake was there any significant correlation between OSDI and the phytoplankton biomass (measured as sub‐surface chlorophyll a concentration). Volume and 4°C‐temperature corrected rates of oxygen depletion for the entire lake were higher in Lake Julius (0.075 mg L −1 day −1 ) than in Lake Moondarra (0.038 mg L −1 day −1 ).