In a March 1981 study of the Lazare Sea, a sector of the Southern Ocean along Queen Maud Land,Euphausia superbaandThysanoessa macruralarvae were abundant in the north and northwest part of the region near the frontal zone between the Weddell Warm Countercurrent (WWC) and Weddell Gyre, 5°W–15°E. Toward the south,E. superbaandE. crystallorophiaslarvae were numerous in the frontal zone between the WWC and the Antarctic Coastal Current. OnlyT. macruralarvae occurred in the central part of the sea. The age composition of larvae was most advanced inT. macrura, probably due to the drift of larvae from the northwest. Because the ice cover diminishes later in the flow from the Weddell Gyre (northernmost area of the region) than in the south,E. superbalarvae were younger in that oceanic subregion than near the shore.T. macruralarvae were sparse near the coast and an onshore-offshore age difference was not pronounced. Both frontal zones correspond to reproductive areas ofE. superbaandT. macrura. E. crystallorophiasspawns only in the southern a
展开▼
