| 南极磷虾年龄组成的体长频数分布混合分析 |
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| 引用本文： | 王荣,鲁北伟,李超伦,王文琪,吉鹏.南极磷虾年龄组成的体长频数分布混合分析[J].海洋与湖沼,1995,26(6):598-605. |
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| 作者姓名： | 王荣 鲁北伟 李超伦 王文琪 吉鹏 |
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| 作者单位： | 中国科学院海洋研究所!青岛，266071，中国科学院海洋研究所!青岛，266071，中国科学院海洋研究所!青岛，266071，中国科学院海洋研究所!青岛，266071，中国科学院海洋研究所!青岛，266071 |
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| 基金项目： | 国家八五攻关专题!85－905－02－01号 |
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| 摘 要： | 本文依据１９８９／１９９０和１９９０／１９９１两个南极夏季在普里兹湾以北海域所获的拖网样品，应用分布混合分析方法，研究大磷虾种群的年龄结构。结果表明，种群内最多可能包括６个年龄：发年幼体，１＾＋，２＾＋，３＾＋，４＾＋和＾５＋龄虾。
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| 关 键 词： | 磷虾 南极磷虾 年龄组成 普里兹湾 体长 分布 |
| 收稿时间： | 1993/9/13 0:00:00 |
| 修稿时间： | 1995/4/28 0:00:00 |
AGE-GROUPS OF ANTARCTIC KRILL (EUPHAUSIA SUPERBA DANA) BY DISTRIBUTION MIXTURE ANALYSIS FROM LENGTH-FREQUENCY DATA |
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| Wang Rong,Lu Beiwei,Li Chaolun,Wang Wenqi and Ji Peng.AGE-GROUPS OF ANTARCTIC KRILL (EUPHAUSIA SUPERBA DANA) BY DISTRIBUTION MIXTURE ANALYSIS FROM LENGTH-FREQUENCY DATA[J].Oceanologia Et Limnologia Sinica,1995,26(6):598-605. |
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| Authors: | Wang Rong Lu Beiwei Li Chaolun Wang Wenqi and Ji Peng |
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| Institution: | Institute of Oceanology, Academia Sinica, Qingdao 266071;Institute of Oceanology, Academia Sinica, Qingdao 266071;Institute of Oceanology, Academia Sinica, Qingdao 266071;Institute of Oceanology, Academia Sinica, Qingdao 266071;Institute of Oceanology, Academia Sinica, Qingdao 266071 |
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| Abstract: | Age-groups of krill (Euphausia superba Dana) collected from the Prydz Bayregion in austral summer of 1989/1990 and 1990/1991 were studied by means ofdistribution mixture analysis from length-frequency data. The results showed thatkrill population might consist of as many as six age-groups: O+,1+,2+,3+,4+ and 5+.Differences in age structure of samples collected at different stations were great,especially in the strengths of 1+ age-groups. Age group 5+ was very weak (small),no more than l % by average- Among the 6 734 specimens (larvae not included)analysed. 1+ accounted for 25.63%; 2+, 22.53%; 3+, 43.46 %; 4+, 7.89 % and 5+0.49 %. The proportions of 1+ and 2+ age-groups observed might be much lowerthan the real ones in the krill population, since all the samples used for the presentstudy were from the open area. That the 3+ was the dominant (87.3gh ) age-groupamong the adults indicated that mortality after spawning must be high. The incre-ases between the mean body lengths of successive age groups showed that high growthrate (14 mm/a) occured in the stage from 1+ juvenile to the 2+ subadult, and de-creased rapidly (5mm/a) during the stage from subadult to the adult (3+), owingto the growth of sexual products.' |
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| Keywords: | Antarctic krill Population structure Prydz Bay |
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