This means that when oxygen is taken up from the water in contact with a gas exchanger, it is replaced considerably more slowly by the oxygen from the oxygenrich regions small distances away from the exchanger than would have occurred in air
या वनस्पती पाण्यातील जलचरांना चांगले खाद्य जरी बनत असले तरी रात्रीच्या वेळात पाण्याची ऑक्सीजन पातळि मोठ्या प्रमाणावर कमी करतात.