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Marine Ecology Progress Series

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MEPS 167:177-183 (1998)  -  doi:10.3354/meps167177

Effects of short-term hypoxia on metabolism and haemocyanin oxygen transport in the prawns Palaemon adspersus and Palaemonetes varians

Annemette Nielsen, Lars Hagerman*

Marine Biological Laboratory, Copenhagen University, Strandpromenaden 5, DK-3000 Helsingør, Denmark
*Addressee for correspondence. E-mail:

In summer, high temperatures are combined with severe nocturnal hypoxia in the shallow water of Danish fjords. Under these conditions, the prawns Palaemonetes varians (Leach) and Palaemon adspersus (Rathke) are spatially separated, with the former occupying the areas of highest temperature and lowest oxygen tension. If kept together, P. adspersus shows aggressive behaviour towards P. varians. Aerobic/anaerobic respiration and haemocyanin characteristics were measured in laboratory experiments (24°C, 14 ppt). Although the 2 species have similar metabolic rates, P. varians survives severe hypoxia better and has a lower Pc (critical oxygen tension, below which respiration is partly or fully anaerobic) than P. adspersus. Both species accumulate high levels of lactate during anaerobiosis and remove it at similar rates. The haemocyanin concentration and total oxygen carrying capacity (0.78 ± 0.25 mmol l-1 and 2.25 ± 0.56 vol%) of P. varians was higher than P. adspersus (0.28 ± 0.07 mmol l-1 and 1.14 ± 0.15 vol%). Haemocyanin oxygen affinity was always higher in P. varians regardless of pH, but the Bohr factor (-1.44 and -1.46) and cooperativity (n50: 2.61 ± 0.20 and 2.82 ± 0.49) were similar for P. varians and P. adspersus, respectively. P. varians is thus better adapted to severe hypoxia than P. adspersus.

Aerobic/anaerobic metabolism · Lactate · Oxygen affinity

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