Abstract
The marble notothen, Notothenia rossii, is widely distributed around the waters of sub-Antarctic islands in the Southern Ocean and is exposed to different temperatures that range from −1.5 to 8 °C. This study investigates whether the different environmental conditions experienced by N. rossii at different latitudes in the Southern Ocean affect the levels of its blood serum antifreeze glycoprotein (AFGP). N. rossii specimens were collected from four localities, including the Ob’ Seamount in the Indian Ocean sector, and South Georgia Island, South Shetland Islands and Dallman Bay in the Atlantic Ocean sector. Serum AFGP activity was determined in terms of thermal hysteresis, i.e. the difference between the equilibrium melting and non-equilibrium freezing points (f.p.s.). Among the four populations, the Ob’ Seamount specimen had the lowest serum AFGP activity (0.44 °C) and concentration (4.88 mg/mL), and the highest non-equilibrium f.p. (−1.39 °C). These results are consistent with the warmer, ice-free waters around the Ob’ Seamount. The other three higher latitude populations have 2–3 times greater serum AFGP activity and concentration, and much lower non-equilibrium f.p.s. In contrast, the physiological profiles of serum AFGP size isoforms revealed that all N. rossii populations, including the Ob’ Seamount specimen, possess an extensive complements of AFGP proteins. Isoform variation was observed, especially in the large size isoforms (AFGPs 1–5), when compared to AFGP of the high Antarctic Dissostichus mawsoni. The lower levels of AFGP and the absence of some of the large isoforms are likely responsible for higher non-equilibrium f.p.s. of the Ob’ seamount specimen.
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Acknowledgments
We thank the crew of the Shinsei Maru 3 (2010) and David Japp and Christopher Heinecken of CapFish CC, Cape town, for donating the Ob’ Seamount specimen, and Eric Anderson who was part of the ICEFISH 2004 cruise. We are indebted to our late colleague Bruce Sidell for the South Georgia Island N. rossii samples he collected on the ICEFISH2004 cruise headed by H. William Detrich and funded by US NSF Office of Polar Programs award OPP-0132032. Additional gratitude goes to Arthur DeVries for providing us with more data and Kevin Bilyk for the assistance he provided. This work is based on research supported by the South African National Antarctic Program/National Research Foundation (SANAP/NRF) Grant SNA 2006042100003 to Ofer Gon, and USNSF-OPP Grants ANT 0636696 and ANT 1142158 to Chi-Hing Christina Cheng.
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Miya, T., Gon, O., Mwale, M. et al. The effect of habitat temperature on serum antifreeze glycoprotein (AFGP) activity in Notothenia rossii (Pisces: Nototheniidae) in the Southern Ocean. Polar Biol 37, 367–373 (2014). https://doi.org/10.1007/s00300-013-1437-y
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DOI: https://doi.org/10.1007/s00300-013-1437-y