{"refrec":{"BRefID":67305,"RR":"<b>Langenbuch, M.; Pörtner, H.O.</b> (2004). High sensitivity to chronically elevated CO<sub>2</sub> levels in a eurybathic marine sipunculid. <i>Aquat. Toxicol. 70(1)</i>: 55-61. <a href=\"https://dx.doi.org/10.1016/j.aquatox.2004.07.006\" target=\"_blank\">https://dx.doi.org/10.1016/j.aquatox.2004.07.006</a>","BEntID":63672,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":0,"RefStringPartII":". <i>Aquat. Toxicol. 70(1)</i>: 55-61. <a href=\"https://dx.doi.org/10.1016/j.aquatox.2004.07.006\" target=\"_blank\">https://dx.doi.org/10.1016/j.aquatox.2004.07.006</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Langenbuch, M.; Pörtner, H.O.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Langenbuch, M.; Pörtner, H.O.","Englishabstract":"CO<sub>2</sub> levels are expected to rise (a) in surface waters of the oceans as atmospheric accumulation continues or (b) in the deep sea, once industrial CO<sub>2</sub> dumping is implemented. These scenarios suggest that CO<sub>2</sub> will become a general stress factor in aquatic environments. The mechanisms of sensitivity to CO<sub>2</sub> as well as adaptation capacity of marine animals are insufficiently understood. Here, we present data obtained in Sipunculus nudus, a sediment-dwelling marine worm that is able to undergo drastic metabolic depression to survive regular exposure to elevated CO<sub>2</sub> levels within its natural habitat. We investigated animal survival and the proximate biochemical body composition during long-term CO<sub>2</sub> exposure. Results indicate an unexpected and pronounced sensitivity characterized by the delayed onset of enhanced mortality at CO<sub>2</sub> levels within the natural range of concentrations. Therefore, the present study contrasts the previously assumed high-CO<sub>2</sub> tolerance of animals adapted to temporary hypercapnia. 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