Effects of Rapid Cooling on Heart Rate of the Japanese Lobster in vivo

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概要

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• Seasonal changes of the effects of rapid cooling on the in vivo heart rate of the lobster, Panulirus japonicus, were studied. Cardiac activity was monitored with chronically implanted electrodes. The mean heart rate was 45.5 ± 6.0 bts/min during winter and 99.5±7.5 bts/min during the other seasons at the same acclimation temperature (20±1℃). When the ambient temperature was lowered (0.1-1.0℃/min, dT=5-6℃), the heart rate decreased along a linear line in spring, summer and fall. The correlation ratio of the heart rate and temperature was 0.98 with the minimum rate of 67.0 ±12.0 bts/min. The Q_<10> value was 2.2. In contrast, the heart rate in winter decreased only for the initial few minutes of cooling and little for the later phase with the minimum rate of 28.8±9.5 bts/min. Q_<10> was 2.6. The correlation plots for the heart rate and temperature appeared to regress on two linear lines. The ratio was 0.88 in the range of 19-21℃ and 0.41 in the range of 15-19℃. These data may suggest that the lobsters in winter have some compensatory mechanisms for a heart rate drop by cooling as well as for the mean heart rate, which are different from those in the other seasons.

• 社団法人日本動物学会の論文
• 1994-06-15

著者

• Nakamura Motonori

  Shimoda Marine Research Center Laboratory Of Physiology University Of Tsukuba

• Kuramoto T

  Univ. Tsukuba Shizuoka Jpn

• Kuramoto Taketeru

  Shimoda Marine Research Center Institute Of Biological Sciences University Of Tsukuba

• Tani Masaki

  Shimoda Marine Research Center, Laboratory of Physiology University of Tsukuba

• Tani Masaki

  Shimoda Marine Research Center Laboratory Of Physiology University Of Tsukuba

関連論文

• PHOTOSENSITIVE NEURONS DISTRIBUTED IN THE CNS OF LIMULUS POLYPHEMUS(Physiology)(Proceedings of the Seventy-Third Annual Meeting of the Zoological Society of Japan)
• Effects of Rapid Cooling on Heart Rate of the Japanese Lobster in vivo
• AN EFFECT OF FLUCTUATING TEMPERATURE ON RESPIRATION OF THE INTACT LOBSTER PANULIRUS JAPONICUS(Physiology)(Proceedings of the Seventy-Third Annual Meeting of the Zoological Society of Japan)

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