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首页> 外文期刊>Marine ecology progress series >Relative production of Calanoides acutus (Copepoda: Calanoida) and Euphausia superba (Antarctic krill) at South Georgia, and its implications at wider scales
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Relative production of Calanoides acutus (Copepoda: Calanoida) and Euphausia superba (Antarctic krill) at South Georgia, and its implications at wider scales

机译：佐治亚州南部的Calanoides acutus（Copepoda：Calanoida）和Euphausia superba（南极磷虾）的相对产量及其对更广泛范围的影响

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Antarctic krill are often described as the major species in Southern Ocean food webs, but there have been no direct site-specific comparisons between their production and that of cope-pods that dominate mesozooplankton biomass. Here, we compare biomass, growth and production of Euphausia superba (Antarctic krill) and the copepod Calanoides acutus at South Georgia, in the Atlantic sector of the Southern Ocean. Average acoustically derived krill biomass across the 5 study years was 2.6 g C m~(-2), 4 to 5 times that of Stages CIV and CV of C. acutus. Mean length of krill was 41 ± 4 mm, and the average growth rate was 0.10 mm d~(-1), giving an average mass-specific growth rate of 0.0084 d~(-1). This equated to a daily gross production of krill of 0.022 g C m~(-2) d~(-1). Gross production of Stages CIV and CV of C. acutus was similar, around 0.026 g C m~(-2) d~(-1). These stages of C. acutus represent about 25 % of the total copepod biomass around South Georgia, so total copepod production here may exceed that of krill by a factor of 4 during the productive summer months. Biomass of copepods and krill in other parts of the Southern Ocean differ by similar orders of magnitude, whilst growth rates are likely to remain within the range measured in this study. Therefore, our finding has relevance outside the local South Georgia system. All of the krill production is likely to be rapidly consumed by higher predators within the surface layers, whilst it is estimated that around 17% of copepod production may be sequestered at depth during winter diapause.
机译：南极磷虾经常被描述为南大洋食物网中的主要物种，但在它们的产量与控制中游浮游生物量的上等荚果的产量之间没有直接的地点特异性比较。在这里，我们比较了南大洋洲大西洋南部佐治亚州的南极磷虾（Euphausia superba）和rill足类Calanoides acutus的生物量，生长量和产量。在5个研究年中，平均声音来源的磷虾生物量为2.6 g C m〜（-2），是a鱼CIV和CV期的4至5倍。磷虾的平均长度为41±4 mm，平均增长率为0.10 mm d〜（-1），平均质量比增长率为0.0084 d〜（-1）。这相当于磷虾的日总生产量为0.022 g C m〜（-2）d〜（-1）。 Acutus CIV和CV阶段的总产量相似，约为0.026 g C m〜（-2）d〜（-1）。 cut鱼的这些阶段约占佐治亚州南部co足类生物总量的25％，因此，在生产性夏季，这里co足类的总产量可能比磷虾高4倍。在南大洋其他地区，pe足类和磷虾的生物量相差近几个数量级，而增长率很可能仍保持在本研究测量的范围内。因此，我们的发现与南乔治亚州本地系统无关。表层内较高的捕食者可能会迅速消耗所有磷虾产量，而据估计，在冬季滞育期间，约有17％的co足类产量可能被隔离。

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