The lower limit of oxyregulation (Pcrit) at different temperatures in the brown shrimp (Crangon crangon).

Hovedområde:Marine biology
Niveau:Masters, Masters

In the marine environment low oxygen levels (hypoxia) and even complete oxygen depletion (anoxia) are not uncommon phenomena. Many marine animals are ‘oxyregulators’, which means that they are able to maintain constant oxygen consumption in spite of decreasing oxygen levels in the surrounding water. However, below a certain oxygen level they can’t keep the oxygen consumption constant and they switch to ‘oxyconformity’, which means that the rate of oxygen consumption becomes proportional to the oxygen level of the surrounding water (see below). The oxygen level at which an oxyregulator shifts to oxyconformity is called the critical oxygen tension (Pcrit).  The Pcrit must, however, not be considered a constant value, because it can be affected by a lot of factors. The most prominent of these factors are temperature and salinity. Therefore, the effect of hypoxia on the Pcrit will depend on the temperature and salinity at which it occurs. As a consequence an oxyregulators physiological ability to keep constant oxygen consumption and thereby normal activity (and behavior) will not only be dependent on the degree of hypoxia but also on the temperature and salinity. This highlights that the effect of hypoxia on marine animals is not only a matter of the severity of the hypoxia.

The aim of the project is to study the effect of temperature on the Pcrit in the brown shrimp (Crangon crangon, Danish: Hestereje) and/or the Baltic prawn (Palaemon adspersus, Danish: Fjordreje eller Roskildereje) and/or the rockpool shrimp (Palaemon elegans, Danish: Tangreje). Dependent on the type of project salinity can be included.

Anvendte metoder:Intermittent respirometry
Keywords:Hypoxia, oxygen consumption, temperature, salinity, marine invertebrates, marine invertebrates
Vejleder(e): Bent Vismann