Whale sightings during POLARSTERN cruise PS138

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....极地海洋中鲸类的分布与种群丰度相关数据仍较为匮乏，原因在于作为标准勘测方法的线样调查法（line-transect surveys）在实际开展中兼具挑战性与高成本。