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Seasonal changes in nauplii and adults of Calanus hyperboreus (Copepoda) captured in sediment traps, Amundsen Gulf, Canadian Arctic

机译:在沉积物陷阱,阿蒙森海湾,加拿大北极地区捕获的无脊椎动物和桡足类成虫的无节幼体和成虫的季节性变化

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摘要

Arctic copepods were collected using time-series sediment traps in the Amundsen Gulf, Canadian Arctic, as part of the CASES (Canadian Arctic Shelf Exchange Study) program. Four sediment traps were deployed at three stations (200 m depth for CA15, 200 and 400 m depths for CA18, and 200 m depth for CA20) from October 2003 to July 2004. We collected many copepod nauplii ranging in body length from 155 to 811 μm, among which nauplii (mostly N1-2) of Calanus with a size of 〜190 μm apparently increased in abundance from February to mid-March. Mature-stage adult females (AF) of Calanus hyperboreus were collected in the traps from February to March, and adult males of C. hyperboreus appeared from November to December at all stations. The likely spawning period of these AF coincided with the occurrence period of 〜190 μm-sized nauplii. This finding suggests that these nauplii were derived from C. hyperboreus and that their breeding began at the beginning of November or December at the latest, continuing through April in the Amundsen Gulf.
机译:北极co足类是使用时间序列沉积物捕集器在加拿大北极地区的阿蒙森湾收集的,这是CASES(加拿大北极层交换研究)计划的一部分。从2003年10月至2004年7月,在三个站点(CA15的深度为200 m,CA18的深度为200和400 m以及CA20的深度为3)部署了四个沉积物捕集器。我们收集了许多co足无节幼体,体长从155到811从2月到3月中旬,其中约190μm大小的无节幼体(主要是N1-2)的卡纳努斯明显增加。从2月至3月在诱捕器中收集了Calaus hyperboreus的成年雌成虫(AF),11月至12月在所有站均出现了C. hyperboreus成年雄性。这些AF的可能产卵期与〜190μm大小无节幼体的发生期相吻合。这一发现表明这些无节幼体起源于高硼酸假丝酵母,最晚在11月或12月开始繁殖,一直持续到4月在阿蒙森海湾。

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