Carcinus maenas and Necora puber were exposed to air for 72 h and 18 h, respectively, at 18 degreesC. @entity1568 excretion, blood and muscle @entity3265 content and blood urate and @entity880 content were recorded throughout the experimental emersion and following reimmersion (recovery period). During emersion, the rate of @entity3265 excretion was strongly reduced in both species, while @entity1133 and @entity6115 excretion were not enhanced. Blood and muscle @entity3265 content increased steadily, reaching 1.3 and 10.4 mmol l-1, respectively, after an 18 h emersion in N. puber. In contrast, in C. maenas, blood @entity3265 levels increased slightly during the first 12 h and then remained at this level (approximately 0.12 mmol l-1) until the end of emersion. Muscle @entity3265 content showed a non-significant increase at 12 h, after which values returned to control values (3.3 mmol l-1) for the next 60 h. Blood urate and @entity880 content increased in emersed N. puber, indicating strong internal @entity519 , but urate content did not increase in C. maenas until the third day of emersion. Upon reimmersion, both species released large amounts of @entity3265 within a few minutes. Two different patterns of @entity3265 release then were observed: @entity3265 excretion was enhanced for a further 3 h in N. puber, whereas raised @entity3265 excretion rates were observed for a further 24 h in C. maenas. These patterns, the recovery of blood and muscle @entity3265 levels and the calculated @entity1568 balance between emersed and control crabs indicated that specific processes were used to manage the @entity1568 overload induced by air exposure. Whereas N. puber shows little or no ability to limit @entity3265 accumulation in its body, C. maenas exhibits strong regulation of its @entity1568 metabolism. The probability that @entity535 synthesis is involved in this regulation and whether these species use metabolic @entity308 as a survival strategy are discussed.

XXXX metabolism of two portunid crabs, carcinus maenas and necora puber, during prolonged air exposure and subsequent recovery: a comparative study

@entity1568 :: ('MESH:D009584', 'Chemical') :: ['Nitrogen', 'nitrogen'] @entity308 :: ('MESH:D003866', 'Disease') :: ['depression'] @entity1133 :: ('MESH:D014508', 'Chemical') :: ['urea'] @entity3265 :: ('MESH:D000641', 'Chemical') :: ['ammonia'] @entity535 :: ('CHEBI:33704', 'Chemical') :: ['amino acid'] @entity6115 :: ('CHEBI:32952', 'Chemical') :: ['amine'] @entity519 :: ('MESH:D000860', 'Disease') :: ['hypoxia'] @entity880 :: ('MESH:D019344', 'Chemical') :: ['lactate']
@entity1568 :: (MESH:D009584,Chemical) :: ['Nitrogen']
