Ecology of Larval Development of the Crustacean Euphausia superba. Change in Dominant Larval Forms as a Function of Environmental Conditions

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Abstract
Variability and patterns of dominance in larval forms of E. superba at the Furcilia-I stage were investigated in the Scotia Sea. Two different water bodies could be distinguished: the Antarctic Circumpolar current (ACC) and waters of the Weddell Sea. Less distinct dominance were noted in ACC waters than in waters of the Weddell Sea. In the latter, the dominance pattern was more distinct, and the total variability of larval forms less pronounced. This discrepancy was apparently due to a more advanced seasonal state of the plankton population in ACC than in Weddell Sea waters. In pure Weddell Sea waters a complete disappearance from the larval population of the usually most abundant E. superba larval form (Form 5'') was discovered. Such an unusual combination of larval forms in these waters is evidently characteristic of a separate subpopulation of E. superba.

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