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>The occurrence ofRhincalanus gigas, Calanoides acutus, andCalanus propinquus(Copepoda: Calanoida) in late May in the area of the Antarctic Peninsula
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The occurrence ofRhincalanus gigas, Calanoides acutus, andCalanus propinquus(Copepoda: Calanoida) in late May in the area of the Antarctic Peninsula
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机译：The occurrence ofRhincalanus gigas, Calanoides acutus, andCalanus propinquus(Copepoda: Calanoida) in late May in the area of the Antarctic Peninsula
The Antarctic copepod speciesRhincalanus gigas, Calanoides acutusandCalanus propinquuswere studied in the area of the Antarctic Peninsula in May 1986. Research was focussed on vertical distribution and stage composition of the populations.Rhincalanus gigasoccurred in greatest densities in the upper layers of the water column, and copepodite stages CI and CII and nauplii dominated the population. Gut content analyses suggest thatR. gigaswas actively feeding. Copepodite stage CV dominated theCalanoides acutuspopulation. At two deep basin stations (water depth>1000 m) theC. acutuspopulation occurred below 500 m, whereas at shallower stations the majority was found above 300 m. Most specimens had empty guts.Calanus propinquusoccurred in low densities, mainly in the upper water layers, and copepodite stage CV dominated. Most individuals of stage V had food in their guts. Our results suggest thatC. acutushad ceased feeding and was overwintering in a resting stage (diapause), whileC. propinquusandR. gigaswere still active, the latter species having finished a late autumn spawning.
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