Overwintering individuals of the Arctic krill Thysanoessa inermis appear tolerant to short term exposure to low pH conditions

Venello, TA; Calosi, P; Turner, LM; Findlay, HS. 2017 Overwintering individuals of the Arctic krill Thysanoessa inermis appear tolerant to short term exposure to low pH conditions. Polar Biology. 10.1007/s00300-017-2194-0

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Abstract/Summary

Areas of the Arctic Ocean are already experiencing seasonal variation in low pH/elevated pCO2 and are predicted to be the most affected by future ocean acidification (OA). Krill play a fundamental ecological role within Arctic ecosystems, serving as a vital link in the transfer of energy from phytoplankton to higher trophic levels. However, little is known of the chemical habitat occupied by Arctic invertebrate species, and of their responses to changes in seawater pH. Therefore, understanding krill’s responses to low pH conditions has important implications for the prediction of how Arctic marine communities may respond to future ocean change. Here, we present natural seawater carbonate chemistry conditions found in the late polar winter (April) in Kongsfjord, Svalbard (79°North) as well as the response of the Arctic krill, Thysanoessa inermis, exposed to a range of low pH conditions. Standard metabolic rate (measured as oxygen consumption) and energy metabolism markers (incl. adenosine triphosphate (ATP) and l-lactate) of T. inermis were examined. We show that after a 7 days experiment with T. inermis, no significant effects of low pH on MO2, ATP and l-lactate were observed. Additionally, we report carbonate chemistry from within Kongsfjord, which showed that the more stratified inner fjord had lower total alkalinity, higher dissolved inorganic carbon, pCO2 and lower pH than the well-mixed outer fjord. Consequently, our results suggest that overwintering individuals of T. inermis may possess sufficient ability to tolerate short-term low pH conditions due to their migratory behaviour, which exposes T. inermis to the naturally varying carbonate chemistry observed within Kongsfjord, potentially allowing T. inermis to tolerate future OA scenarios.

Item Type: Publication - Article
Additional Information. Not used in RCUK Gateway to Research.: This is a post-peer-review, pre-copyedit version of an article published in Polar Biology. The final authenticated version is available online at: http://dx.doi.org/10.1007/s00300-017-2194-0
Additional Keywords: Euphausiacea, Arctic Ocean, Kongsfjord, Ocean acidification, Ocean change, Crustaceans
Subjects: Ecology and Environment
Marine Sciences
Divisions: Plymouth Marine Laboratory > Science Areas > Marine Ecology and Biodiversity
Depositing User: Helen Findlay
Date made live: 15 May 2018 14:28
Last Modified: 04 Aug 2018 01:58
URI: http://plymsea.ac.uk/id/eprint/7657

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