We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Effect of increasing sea water pCO on the northern Atlantic krill species Nyctiphanes couchii.
- Authors
Sperfeld, Erik; Mangor-Jensen, Anders; Dalpadado, Padmini
- Abstract
Surprisingly little is known about potential effects of ocean acidification on krill of the Northern Hemisphere as ecologically very important food web component. Sub-adult individuals of the northern Atlantic krill species Nyctiphanes couchii (caught at Austevoll near Bergen, Norway, in January 2013) were exposed in the laboratory to four different levels of pCO (430, 800, 1,100, and 1,700 µatm) for 5 weeks in order to assess potential changes in a set of biological response variables. Survival decreased and the frequency of moulting-related deaths increased with increasing pCO. Survival was considerably reduced at relatively high pCO of 1,700 µatm and tended to be negatively affected at 1,100 µatm pCO. However, the experimental results show no significant effects of pCO on inter-moult period and growth at pCO levels below 1,100 µatm. No differences in length measurements of the carapace and uropod were observed across pCO levels, indicating no effect of changing carbonate chemistry on the morphology of those calciferous parts of the exoskeleton. The results suggest that sub-adult N. couchii may not suffer dramatically from predicted near-future changes in pCO. However, potential detrimental effects on the moulting process and associated higher mortality at 1,100 µatm pCO cannot be excluded. Further experiments are needed in order to investigate whether early life stages of N. couchii show a different sensitivity to elevated sea water pCO and whether those results are transferable to other krill species of the Northern Hemisphere.
- Subjects
NORTHERN Hemisphere; SEAWATER; POLYCYSTIC ovary syndrome; KRILL; NYCTIPHANES; OCEAN acidification; FOOD chains
- Publication
Marine Biology, 2014, Vol 161, Issue 10, p2359
- ISSN
0025-3162
- Publication type
Article
- DOI
10.1007/s00227-014-2511-x