The relationship between locomotor activity rhythm and burying behavior in the wrasse, Suezichthys gracilis.
スポンサーリンク
概要
- 論文の詳細を見る
The wrasse, <I>Suezichthys gracilis</I>, is a diurnal fish which buries itself in sand during the night-time. The present paper deals with the locomotor activity rhythms of <I>S. gracilis</I>, examined by using an actograph with infra-red photo-electric switches in a dark room. The fish were kept in eight experimental tanks (each 30<I>l</I> in capacity), with three different bottom conditions: sand (grain size about 1mm in diameter and 5 cm deep); 1 or 2 stones (about 10cm in diameter) without sand; and transparent acrylic pellets (2×2×3mm in size, 5cm deep). The light intensities were 550-700 lux just above the water surface, decreasing to 21.3% under the acrylic pellets at a water depth of 20cm. The water temperatures were kept at 22.0-25.0°C during the experiments for 7 to 14 days. In the aquarium with bottom sand, diel activity rhythms of <I>S. gracilis</I> were mostly synchronized to LD (LD12: 12; 06: 00-18: 00 light, 18: 00-06: 00 dark), free-running activity rhythms continued distinctly under LL (constant illumination), and locomotor activity was greatly suppressed, with disappearance of the activity rhythm, under DD (constant darkness). In the aquarium without sand, locomotor activity of <I>S. gracilis</I> could be summarized as follows. The fish moved throughout almost the entire period under LD, though more frequent movements were observed in light conditions than in dark ones. Under LL they showed continuous locomotor activity during the experiment, with no obvious periodicity. Under DD the activity of the species was somewhat suppressed, but irregular movement or indistinct periodicity was observed. In the aquarium with transparent acrylic pellets, locomotor activity under LD and DD, respectively, bore a close resemblance to activity patterns under the same light conditions with sand, whilst activity under LL was identical to that under LL without sand. Accordingly, it seems that maintenance of normal activity rhythms in the wrasse was due not only to the darkness, but also to the presence of bottom sand. It therefore seems that the biological clock in <I>S. gracilis</I> is not related to locomotor activity, but to burying behavior.
- 日本魚類学会の論文
日本魚類学会 | 論文
- スジシマドジョウ小型種と大型種の急減
- スジシマドジョウ種群における地方的分化〔英文〕
- マアジの卵発生と初期発育
- 摂餌または飢餓状態のブリ仔魚における消化器官の組織学的構造と機能について
- ニジマス(Oncorhynchus mykiss)の胆汁カルシウム濃度に及ぼすスタニウス小体抽出物および17β-エストラジオールの影響