水温変化に対するエゾアワビの心拍応答

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Apparent association between frequencies of alleles encoding thermostability variations of enzymes and water temperatures observed in wild populations has suggested differential temperature tolerances related to the genetic variations in the pacific abalone Haliotis discus hannai. Heart-rate responses, as a physiological indicator, against water-temperature changes were compared between animals with differential genetic make-ups in thermostability of enzyme to examine the above results suggested from observing wild populations by using a total of 98 specimens of the pacific abalone, sampled from waters of Sanriku, Iwate and Rebun Islands, Hokkaido. After being acclimated to a rearing tank with water temperature regulating system, each animal was subjected to a constant rate of change of water temperatures for recording heart-rate responses until being sacrificed. Heart-rate was recorede as frequency of changes of impedance between two elec-trodes inserted immediately dorsal to the heart through fine holes in the shell. Temperatures, at which maximum heart-rate (or one half of the maximum) appeared, varied from one animal to another, as demonstrated by distributions of selected parameter(s) of heart-rate curve. In addition, associations between the parameter and genetic make-up of thermostability of enzyme of individual animals were observed, thus supporting the view on possible adaptive value of temperature tolerance, suggested from observations on wild populations noted above.

水温変化に対するエゾアワビの心拍応答

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