DEPTH DISTRIBUTION OF CALANUS-FINMARCHICUS AND CALANUS-GLACIALIS IN RELATION TO ENVIRONMENTAL-CONDITIONS IN THE BARENTS SEA

被引：101

作者：

UNSTAD, KH

TANDE, KS

机构：

[1] Department of Aquatic Biology, Norwegian College of Fishery Science, University of Tromsø, Tromsø

来源：

POLAR RESEARCH | 1991年 / 10卷 / 02期

关键词：

D O I：

10.1111/j.1751-8369.1991.tb00662.x

中图分类号：

Q14 [生态学（生物生态学）];

学科分类号：

071012 ; 0713 ;

摘要：

Stage composition and vertical distribution of copepodids of Calanus finmarchicus and C. glacialis arc described during spring and summer in Atlantic and Arctic waters, respectively. The two species cooccurred in the region of the Polar Front, both in moderate to high population densities. Ontogenetic migration, meaning that the migration range becomes progressively wider with advancing stage, was found in both species. The present study also revealed that C. finmarchicus had modifications in its ontogenetic vertical distribution. The standing crop of phytoplankton, predominantly Phaeocystis pouchetii, appeared to influence the degree of stage-specific segregation. Both low and high food concentrations tended to increase the vertical distribution of the instars. On the other hand, a narrow subsurface stratum of abundant phytoplankton led to an aggregation of copepodids at this depth. In thc region of thc Polar Front, where the two species co-occur, C. glacialis had a deeper distribution than C. finmarchicus. thus creating a bimodal vertical distribution pattern within the uppermost 200 m.

引用

页码：409 / 420

页数：12

共 37 条

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