Variation in blood serum antifreeze activity of Antarctic Trematomus fishes across habitat temperature and depth

Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
Lauren G Fields, A L DeVries

Abstract

High latitude waters in the Southern Ocean can be near their freezing point and remain ice-covered throughout the year whereas lower latitude Southern Ocean waters have seasonal ice coverage and comparatively large (6 °C) annual temperature changes. The genus Trematomus (suborder Notothenioidei) is regarded primarily as a high latitude group because of its abundance there, they also inhabit the warmer regions in smaller numbers. Freeze avoidance in the notothenioids is linked to the presence of two antifreeze proteins (AFPs); the antifreeze glycoproteins (AFGPs) and antifreeze potentiating protein (AFPP), both of which adsorb to internal ice crystals inhibiting growth. Both high and low latitude trematomids possess sufficient AFP to lower their blood freezing point below that of seawater (-1.9 °C). We investigated the contributions of AFGPs and AFPP to the blood freezing point depression to determine how they varied with depth, water temperature, and the presence of ice. High latitude trematomids had lower blood freezing points than those inhabiting lower latitude waters indicating differences in their freeze avoidance capacities. Lower freezing points were associated with higher levels of antifreeze activity due to higher leve...Continue Reading

References

Jun 1, 1977·Proceedings of the National Academy of Sciences of the United States of America·J A Raymond, A L DeVries
Apr 1, 1996·Molecular Phylogenetics and Evolution·P A RitchieD M Lambert
Jan 21, 2006·The Journal of Experimental Biology·Paul A CzikoArthur L DeVries
May 27, 2006·Comparative Biochemistry and Physiology. Part B, Biochemistry & Molecular Biology·Yumi Jin, Arthur L DeVries
May 22, 2009·Molecular Ecology·Michael MatschinerWalter Salzburger
Sep 18, 2009·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Kim PraebelArthur L DeVries
Jun 12, 2012·Molecular Phylogenetics and Evolution·A-C LautrédouA Dettai

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Citations

Dec 8, 2017·Molecular Biology and Evolution·Helle Tessand BaalsrudSissel Jentoft
Aug 21, 2015·Journal of Physics. Condensed Matter : an Institute of Physics Journal·David J BurbanPatricia A Jennings

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