Ross seal (Ommatophoca rossii) annual distribution, diving behaviour, breeding and moulting, off Queen Maud Land, Antarctica
Ross seal (Ommatophoca rossii) annual distribution, diving behaviour, breeding and moulting, off Queen Maud Land, Antarctica
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DOI：
10.1007/s00300-007-0306-y
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发表时间：
2007-10-01
期刊：
影响因子：
1.7
通讯作者：
Nordoy, Erling S.
中科院分区：
文献类型：
--
作者：
Blix, Arnoldus Schytte;Nordoy, Erling S.
在2月份蜕皮后不久，在毛德皇后地附近用Argos卫星连接的潜水记录仪标记的10只成年罗斯海豹中，有6只提供了一年中的位置和潜水活动数据。在标记后不久，这些动物向北行进了2,000公里，并在南极极锋以南的地区停留在远洋，直到10月它们向南进入浮冰群。全年，他们每天进行约100次潜水，大多数深度为100-300米，有记录的最深潜水深度为792米，而在浮冰停留期间，有些潜水非常浅。在繁殖期和换羽期之外，大多数潜水全年持续5-15分钟。这种潜水行为与在浮冰中以中层水鱼类为食，如南极侧棘鲷、鱿鱼，在某种程度上还以磷虾（南极磷虾）为食，而在公海中则以乌贼和几种鱿鱼为食。11月中旬为13天的哺育期，1月下旬至2月上旬为换羽期，这是对该物种进行目击调查的时期。
Six out of ten adult Ross seals that were tagged with Argos satellite-linked dive recorders off Queen Maud Land, just after the moult in February, provided data on location and diving activity throughout a year. Shortly after tagging, the animals headed 2,000 km north and stayed pelagic in the area south of the Antarctic Polar Front, until October when they went south into the pack-ice. Throughout the year they made about 100 dives a day, most to a depth of 100-300 m, the deepest dive on record being 792 m, while some dives were very shallow during their stay in the pack-ice. Most dives, outside the breeding and moulting period, lasted for 5-15 min throughout the year. This diving behaviour is consistent with feeding on mid-water fish, like Pleurogramma antarcticum, squid, and to some extent krill (Euphausia superba), when in the pack-ice, and myctophid fish and several species of squid, when in the open ocean. The nursing period was 13 days in mid-November, and moulting occurs in late January-early February, which is the period when sightings surveys for this species should be done.