Diurnal fluctuations in hematological and blood biochemical parameters in captive Indo-Pacific bottlenose dolphins <i>Tursiops aduncus</i>

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  • ミナミバンドウイルカの血液学および血液生化学的検査値にみられた日内変動
  • ミナミバンドウイルカ ノ ケツエキガク オヨビ ケツエキ セイカガクテキ ケンサチ ニ ミラレタ ニチナイ ヘンドウ

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Abstract

Diurnal fluctuations of seven hematological and 17 blood biochemical parameters were investigated in the winter solstice, spring equinox and summer solstice in captive Indo-Pacific bottlenose dolphins Tursiops aduncus. Blood sampling and feeding were conducted in three hour intervals for 24 h from four adult healthy males (estimated age; 36 to 39 years) kept in natural environmental conditions. HT, BUN, UA, TG, HGB, RBC, WBC, T-CHO, ALP and K showed diurnal rhythms, and four presented especially obvious diurnal rhythms with the lowest at 18:00 h in HT, and peaks during the evening or night in BUN, UA and TG (P<0.01). Acrophases of diurnal rhythms in these four parameters were not significantly different among the three seasons studied, and we suggested that these rhythms entrained environmental light-dark cycles and were controlled by endogenous circadian clock in the captive dolphins. Other parameters showed different three patterns: 1) irregular pulsed fluctuation (Eos, Alb, GOT, GPT, T-Bil, CPK, Na and Cl), 2) increase or decrease over time (Cre and Glu), and 3) no major changes throughout the day (Neut, Lym, TP and LDH).<br>

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