Lack of acclimation in Ophionotus victoriae: brittle stars are not fish
Acclimation is possibly the most important criterion deciding an animal’s ability to survive change. Species with poor abilities to acclimate to small environmental change are likely to be the most vulnerable in future warming scenarios. Two separate assemblages of Ophionotus victoriae were slowly acclimated from 0°C to either +2 or +3°C and then held at these higher temperatures over a prolonged timescale. None of the animals were able to acclimate; with failure occurring from day 19 at +3°C and day 24 at +2°C, indicating that this species is very sensitive to small long-term seawater temperature increases. These data indicate that O. victoriae has probably the poorest ability to acclimate to elevated temperatures of any species studied to date. Given previous data showing some Antarctic fish can acclimate to +4°C, the predicted effects of increased seawater temperatures on the Antarctic food web and ecology must be assessed at the individual species level and interpreted with care.
KeywordsOphiuroid Antarctic Temperature Climate change Acclimation Vulnerability
- Arntz WE, Brey T, Gallardo VA (1994) Antarctic zoobenthos. Oceanogr Mar Biol 32:241–304Google Scholar
- Barnes DKA, Griffiths HJ (2008) Biodiversity and biogeography of southern temperate and polar bryozoans. Global Ecol Biogeogr 17:84–99Google Scholar
- Madsen FJ (1967) Ophiuroidea. British and Australian NZ Antarctic Research Expedition 1929–1931. Rep Adelaide (Ser B Zool Bot) 9:123–145Google Scholar
- Peck LS, Conway LZ (2000) The myth of metabolic cold adaptation: oxygen consumption in stenothermal Antarctic bivalve molluscs. In: Harper E, Crame AJ (eds) Evolutionary biology of the bivalvia. Geological Society of London Special publication 177. Cambridge University Press, Cambridge, pp 441–450Google Scholar
- Peck LS, Clark MS, Morley SA, Massey A, Rosetti H (2008b) Animal temperature limits: effects of size, activity and rates of change. Funct Ecol (in press)Google Scholar