Reasons for natural variation

like Terrestrial animals aquatic animals need oxygen to live.little microscopic bubbles of do is transfered into

fish and other aquatic organisms blood stream.oxygen is also neededfor algea and macrophytes,

oxygen is produced during photosinthinsis and consumed during respriation and decomposition.Photosinthinsis needs

sunlight so it only occurs during daylight hours.Respiration and decomposition occurs 24 hours.Its lowest just befor dawn when photosinthinsis resumes.

Oxygen concentrations are much higherin the air its about 21% oxygen then in water which is tiny fraction of 1 percent oxygen.more oxygen dissolves into

water when the wind stir the water .cold water can hold more of any gas .in this case oxygen than warm water .

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As water becomes warmer Do.