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  _____     ______              _____     _____   
 /  ___||  /_   _//   ____     |  ___||  |__  //  
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| \\_\ ||   _| ||_   | [] ||   | ||__     / //__  
 \____//   /_____//  |  __//   |_____||  /_____|| 
  `---`    `-----`   |_|`-`    `-----`   `-----`  
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Text this: Oxygen stress in Salvinia natans: Interactive effects of oxygen availability and nitrogen source