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Marine mammals

机译:海洋哺乳动物

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摘要

The spatial and temporal occurrence of cetaceans in the Black Sea and particularly along its southwestern coast-line is poorly studied. Based on a total of 609 encounters, we present the analysis of monthly dynamics of (1) the numbers of cetacean sightings and (2) their group size for all three Black Sea cetacean species: the bottlenose dolphin (Tursiops truncatus), the short-beaked common dolphin (Delphinus delphis) and the harbour porpoise (Phocoena phocoena) over a continuous period of 29 months (January 2018-May 2020) from two fixed coastal observation points near the city of Zon-guldak, Turkey. Seasonal fluctuations were found in the occurrence of all three species, with peaks in April-May (spring). Similarly, the largest groups of P. phocoena and T. truncatus were recorded in the late spring and early summer period, while D. delphis had a peak in July (summer). In case of the harbour porpoise, we speculate that these variations can be explained by the annual migrations from the northwestern to southern waters of the Black Sea, while the seasonal dynamics of the two Delphinidae species might depend on fish prey availability. While our data were collected locally, the results provide better insight into the ecology of cetaceans within the entire Black Sea.
机译:研究了黑海中鲸类的空间和时间发生,特别是在西南海岸线的情况下进行了很差。基于总共609次遭遇,我们展示了(1)鲸类目击的数量和(2)所有三个黑海的群体的数量和(2)的群体大小:瓶颈海豚(Tursiops truncatus),短 - 烧焦的普通海豚(Delphinus Delphis)和港口Porpoise(Phocoena Phocoena)在29个月(2018年5月 - 5月2020年1月)来自土耳其Zon-Guldak市附近的两个固定的沿海观察点。在所有三种物种的发生时发现季节性波动,4月至5月(春季)的峰值。同样,在春季和夏季初期和夏季期间记录了最大的P. Phocoena和T.Truncatus群体,而D. Delphis于7月份(夏季)有巅峰。在港口海豚的情况下,我们推测,这些变化可以通过西北地区到黑海的南部水域的年度迁徙来解释,而两种替代物种的季节性动态可能取决于鱼类猎物的可用性。虽然我们的数据在本地收集,但结果可以更好地深入了解整个黑海内的鲸类生态。

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  • 来源
    《Oceanographic Literature Review》 |2021年第2期|366-368|共3页
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