Temperature dependency of miniature end plate currents from the extraocular muscle of Antarctic teleost fishes

Cox, Serena L.; Macdonald, John A.
June 2008
Polar Biology;Jun2008, Vol. 31 Issue 6, p709
Academic Journal
The effects of temperature on the decay phase of post-synaptic currents were examined to determine the extent of temperature compensation in the inferior oblique extraocular muscles of four Antarctic fishes ( Trematomus bernacchii, Trematomus pennellii, Trematomus hansoni, and Pagothenia borchgrevinki, Family Nototheniidae). At ambient temperatures, different fish produce miniature end plate currents (MEPCs), which vary in duration and rate of decay. Low temperatures normally prolong MEPCs, however, Antarctic fishes were found to produce MEPCs of significantly shorter duration than predicted (based on back-extrapolation of temperate fish data to sub-zero temperatures). Notothenioid decay time constants were approximately 500 μs faster than their temperate counterparts, extrapolated to −2°C, suggesting that the difference is consistent with temperature compensation in the neural-systems of Antarctic fish. Results presented here conform the hypothesis that post-synaptic MEPCs of Antarctic fish exhibit temperature compensation, an adaptive feature that has permitted the successful radiation throughout the Southern Ocean.


Related Articles

  • Inducible heat tolerance in Antarctic notothenioid fishes. Podrabsky, Jason E.; Somero, George N. // Polar Biology;Jan2007, Vol. 30 Issue 1, p39 

    Significant increases in heat tolerance (time of survival at 14°C) were observed for some, but not all, species of notothenioid fishes collected from McMurdo Sound, Antarctica (77°51′S) following acclimation to 4°C. The increase in thermal tolerance was rapid in Trematomus...

  • Effects of warm acclimation on serum osmolality, cortisol and hematocrit levels in the Antarctic fish, Trematomus bernacchii. Hudson, H. A.; Brauer, P. R.; Scofield, M. A.; Petzel, D. H. // Polar Biology;Aug2008, Vol. 31 Issue 8, p991 

    Antarctic fish, such as the Trematomus bernacchii, living at −1.9°C maintain a serum osmolality of around 600 mOsm kg−1, nearly twice that of temperate fish. Upon warm acclimation, Antarctic fish significantly lower their serum osmolality. It has been suggested that this response...

  • Cloning and characterization of a Δ-desaturase gene of the Antarctic fish Chionodraco hamatus and Trematomus bernacchii. Porta, Amalia; Fortino, Vittorio; Armenante, Annunziata; Maresca, Bruno // Journal of Comparative Physiology B: Biochemical, Systemic & Env;Apr2013, Vol. 183 Issue 3, p379 

    Chionodraco hamatus and Trematomus bernacchii are perciforms, members of the fish suborder Notothenioidei that live in the Antarctic Ocean and experience very cold and persistent environmental temperature. These fish have biochemical and molecular features that allow them to live at these...

  • Genetic basis of resistance to stress in fishes. Molecular and classical investigations in a few model organisms. Petrescu-Mag, I. Valentin; Boaru, M. Anca; Hărşan, Radu; Petrescu-Mag, Ruxandra M. // Aquaculture, Aquarium, Conservation & Legislation - Internationa;2008, Vol. 1/2008, p99 

    The paper focuses on the recent scientific results from genetics of thermal stress tolerance and discusses about heat shock genes in several model fish organisms, such as: the guppy (Poecilia reticulata), the Antarctic fish (Trematomus bernacchii), the desert fish (Poeciliopsis lucida), the...

  • A difference in optomotor behaviour of two Antarctic nototheniid fishes is correlated with the presence of a choroid rete mirabile and Root effect. Herbert, Neill A.; Macdonald, John A.; Wells, Rufus M. G.; Davison, William // Polar Biology;Jun2003, Vol. 26 Issue 6, p411 

    The hypothesis that fish vision is influenced by the presence of a choroid rete mirabile (an oxygen-concentrating apparatus in the eye) and the Root effect was tested using the optomotor response in two nototheniid species from Antarctica. Pagothenia borchgrevinki, an active cryopelagic...

  • Feeding biomechanics of five demersal Antarctic fishes. Bansode, Mugdha; Eastman, Joseph; Aronson, Richard // Polar Biology;Dec2014, Vol. 37 Issue 12, p1835 

    There is scant information available on the ecomorphology of Antarctic fishes, and especially on their feeding capabilities. We measured interspecific variation in mechanical advantage (MA), force-producing capability, and suction index for the jaws of the five dominant taxa of high-Antarctic...

  • X-cell disease in Antarctic fishes. Evans, Clive; Tupmongkol, Kharnthorn // Polar Biology;Sep2014, Vol. 37 Issue 9, p1261 

    A number of Antarctic fish species are affected by an unusual gill condition known as X-cell disease, named in reference to morphologically similar lesions of unknown aetiology reported from northern hemisphere fishes. Despite the disease being first recorded in Antarctic fishes over 25 years...

  • Trophic ecology of the emerald notothenTrematomus bernacchii(Pisces, Nototheniidae) from Terra Nova Bay, Ross Sea, Antarctica. La Mesa, M.; Dalü, M.; Vacchi, M. // Polar Biology;Nov2004, Vol. 27 Issue 11, p721 

    The trophic ecology of the emerald notothenTrematomus bernacchiiwas investigated using a sample of 284 specimens collected in the coastal waters of Terra Nova Bay (Ross Sea) during the summer season 1990-1991. The stomach-content analysis provided data on feeding habits and trophic niche...

  • Total Mercury in Six Antarctic Notothenioid Fishes. Wintle, Nathan; Sleadd, Isaac; Gundersen, Deke; Kohl, Kristina; Buckley, Bradley // Bulletin of Environmental Contamination & Toxicology;Nov2015, Vol. 95 Issue 5, p557 

    We analyzed white muscle samples from six species of Antarctic fish (suborder Notothenioidei) collected in 2011 from McMurdo Sound, Ross Sea, Antarctica, to assess levels of total mercury (THg). Gymnodraco acuticeps and Trematomus bernacchii exhibited the highest concentrations of THg followed...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics