Population structure of daytime surface swarms of the euphausiid Meganyctiphanes norvegica in the Bay of Fundy
Population structure of daytime surface swarms of the euphausiid Meganyctiphanes norvegica in the Bay of Fundy
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芬迪湾磷虾白天表层群体的种群结构
DOI：
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发表时间：
1984
期刊：
影响因子：
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通讯作者：
S. Nicol
中科院分区：
文献类型：
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作者：
S. Nicol
1979 年至 1983 年夏季，研究人员对发生在芬迪湾布赖尔岛和长岛附近的磷虾科 Meganyctiphanesnorvegica 的白天地表群进行了研究。雄性主导的群体和雌性主导的群体都会遇到，但雌性群体更为常见。与在深处采集的样本以及其他研究中一年中类似时间该物种的种群结构相比，地表群体中的个体只占种群的有限部分。雄性和雌性均处于繁殖状态；雄性拥有成熟的精囊，雌性则受精并表现出处于成熟晚期的卵巢。群体的存在伴随着浮游生物中褐藻卵的爆发，其空间和时间尺度与群体事件一致。结论是这些群体与繁殖活动有关。
Daytime surface swarms of the euphausiid Meganyctiphanes norvegica occurring off Brier and Long Islands in the Bay of Fundy were studied during the summers of 1979 to 1983. Individual swarms were found to have highly skewed sex ratios; both male dominated and female dominated swarms were encountered but female swarms were more common. Individuals in surface swarms comprised a restricted part of the population when compared to samples taken at depth and when compared to the population structure of this species at similar times of year in other studies. Both males and females were in breeding condition; males possessed ripe spermatophores, females were fertilized and exhibited ovaries in an advanced stage of maturation. The presence of swarms was accompanied by bursts of M. norvegica eggs in the plankton on spatial and temporal scales coincident with the swarming events. It is concluded that these swarms are related to reproductive activity.