Whale sightings during POLARSTERN cruise ANT-XXIX/5 (PS81)
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https://b2find.eudat.eu/dataset/3196e67b-c4c8-582f-9b7c-a2fc98fe0202
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Data on whale distribution and abundance in the polar oceans is rather sparse, as implementing the standard surveying method, line-transect surveys, is challenging and costly....
极地海域鲸类分布与种群丰度的相关数据仍较为匮乏，这是由于标准调查方法——样线调查法（line-transect surveys）——的实施难度较高且成本高昂……
