Increases in tissue amino acid levels in response to ammonia stress in the terrestrial isopod Porcellio scaber Latr.

Terrestrial isopods excrete waste nitrogen by intermittent volatilization of ammonia and must therefore accumulate amino groups in a non‐toxic form between excretory bouts. High‐performance liquid chromatography (HPLC) was used to analyze concentrations of 23 amino acids in the oniscidean Porcellio scaber following a 7‐day exposure to elevated PNH3 (“ammonia stressing”). Analyses were performed on four separate tissues: hindgut, hepatopancreas, …