南极磷虾的生长与复眼直径关系的研究

本文对南极磷虾复眼的直径与磷虾体长之间的关系、在负生长状态下磷虾复眼直径的变化等进行了研究。实验结果表明：在正常情况下（磷虾身体不出现负生长），磷虾复眼的直径与体长之间存在指数函数关系。雌性磷虾的眼径（ＥＤ）与体长（ＢＬ）之间的关系为：ＥＤ＝０．５８９８ｅ０．０２８２ＢＬ（ｒ＝０．９６１３，ｎ＝２４１９）；雄虾的眼径与体长之间的关系为：ＥＤ＝０．５４４ｅ０．０３０９ＢＬ（ｒ＝０．９６２２，ｎ＝１９２０）。在相同体长的情况下，雄性磷虾的复眼直径比雌虾的大。从活体培养的结果来看，当南极磷虾出现负生长时，复眼直径保持不变，即眼径不受负生长的影响。在正常情况下（不存在负生长），雌虾的体长与眼径之间的比率（ＢＬ／ＥＤ）平均为２１．３２±０．０４（ｎ＝１３４７），雄虾的体长与眼径之间的比率平均为２０．６８±０．０７（ｎ＝７４８），未成体虾的体长与复眼直径之间的比率平均为２１．５４±０．０６（ｎ＝１０７２）。利用体长与眼径之间的比率可以准确地将在实验室内活体培养后已存在负生长的磷虾与其它处于正常状态的磷虾分开。体长与眼径之间的比率也可以作为磷虾种群是否存在负生长的监测指标

STUDY ON THE RELATIONSHIP BETWEEN THE DIAMETER OF THE COMPOUND EYE AND GROWTH OF ANTARCTIC KRILL

Correlation between the body length and the diameter of the compound eye of the Antarctic krill Euphausia superba was examined. From the samples collected in the late summer,it shows that there is an apparent exponential relationship between the eye diameter and the body length. From the laboratory population,it seems that when the krill shrink,the diameter of the compound eye does not decrease. It is more reliable to use the eye diameter as krill growth index than body length. The ratio of the body length to the diameter of the compound eye offers another method for detecting the effect of shrinking in natural populations of krill.