DISTRIBUTIONAL ECOLOGY OF EUPHAUSIID LARVAE IN THE ANTARCTIC PENINSULA REGION AND ADJACENT WATERS (Eleventh Symposium on Polar Biology)

• Main Authors: Rodion MAKAROV, Larisa MENSHENINA, Vasili SPIRIDONOV
• Format: Report
• Language: English
• Published: Proceeding 1990
• Subjects: Antarctic; Antarctic Peninsula; Palmer Archipelago; The Antarctic; Antarc*; Polar Biology; Proceedings of the NIPR Symposium on Polar Biology; Thysanoessa macrura
• Online Access: https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=5085; http://id.nii.ac.jp/1291/00005085/; https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=5085&item_no=1&attribute_id=18&file_no=1

The distribution of euphausiid larvae was investigated in the Antarctic Peninsula region and adjacent waters in the summers of 1976-79 and in the autumns of 1981-82. Larvae of Euphausia frigida and E. triacantha (particularly) were restricted to the northern, oceanic part of the region. Larvae of E. superba were most abundant and were found at the shelf and slope areas, where waters of high-latitude origin and waters of the frontal zone were distributed. Larvae of Thysanoessa macrura were found in all types of waters. Within the intermediate (confluence) zone, these larvae were most scanty and younger than those found anywhere. In distinction from the last two species, larvae of E. crystallorophias were abundant only at the southwestern inshore region. There was a notable decrease of the larval abundance of all species and a strong contrast of age composition in the Palmer Archipelago region. Larvae are older to the north-east than to the south-west of this area. In the oceanic zone (ACC), T. macrura begins to spawn after E. frigida. In the inshore waters the spawning begins in the following order: T. macrura, E. crystallorophias, and then E. superba.