Inter- and intra-annual frequency variations of large-whale calls in the sout...

In the past decades, an inter-annual decline of the frequency of blue whale calls is been observed worldwide (Mc Donald et al., 2009), along with an intra-annual variation, best...过去数十年间，全球范围内均已观测到蓝鲸叫声频次的年际下降趋势（McDonald 等，2009），同时伴随年内变化，其最……