肠道荧光法测定大磷虾(Euphausia superba Dana)的肠道排空率和摄食率

在 １９９２～１９９３年度南极夏季期间，用肠道荧光法现场测定大磷虾（Ｅｕ－ ｐｈａｕｓｉａ　ｓｕｐｅｒｂａ　Ｄａｎａ）的肠道排空率和肠道内含物色素水平，并据此计算自然状况下 大磷虾的摄食率。大磷虾的肠道排空率为０．４３／ｈ。次成体（平均体重为１６８．８ｍｇ干 重）和成体（平均体重为 ２７４．３ｍｇ干重）的摄食率分别为 １８０．６±１９．２和 ４６４．４± ２８．３ｎｇ叶绿素ａ／ｈ。自然状况下大磷虾的摄食率与现场测定的 １００ｍ以上水层平均 叶绿素ａ浓度的相关性不大。

ESTIMATION OF EVACUATION RATA AND INGESTION RATE OF ANTARCTIC KRILL Euphausia superba Dana, BY GUT FLUORESCENCE METHOD

During the austral summer of 1992-1993, the gut evacuation rate and ingestion rate of Antarctic krill, Euphausia superba Dana, were measured on board the ship R/V JiDi in the Southern Scotia Sea and Prydz Bay region, Antarctica. Pigments level of gut content (Gt) of krill declined exponentialy against time (t) when krill were incubated in filtered seawater which expressed by the formula Gt= 3. 7ie-0. 427t, (R= 0. 967 ). The evacuation rate T = 0. 427h-l, and the gut passage time T= 1/r = 2. 34h. Ingestion rates of sub-adult krill (mean 1 68. 8 mg dry weight) ranged from 35. 4 to 902. 0 ng chl a. h-1 with average of 180. 6. That of adult krill (mean 274. 3 mg dry weight) were 36. 0-3 040. 3 ng chl a. h-l (average of 464. 4). Ingestion rate did not increase with the increase of ambient chlorophyll a concentration.