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首页> 外文期刊>Marine ecology progress series >Seasonal distribution and life history of Thysanoessa macrura (Euphausiacea, Crustacea) in high latitude waters of the Lazarev Sear Antarctica
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Seasonal distribution and life history of Thysanoessa macrura (Euphausiacea, Crustacea) in high latitude waters of the Lazarev Sear Antarctica

机译：南极拉扎列夫高纬度水域Thysanoessa macrura（Euphausiacea，甲壳纲）的季节性分布和生活史

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摘要

Although Thysanoessa macrura is one of the most abundant and widely distributed euphausiid species in the Southern Ocean, knowledge about its seasonal distribution and overwintering strategy remains sparse. We describe the variation in abundance, demography, and distribution of T. macrura during 3 seasons in the Lazarev Sea, located in the south-east Atlantic sector of Antarctica. Adult and larval T. macrura were widely distributed across the Lazarev Sea in all seasons, but with large seasonal variability in the adult population. Mean summer densities (4.9 and 7.0 ind. m~(-2)in 2005/06 and 2007/08, respectively) were 20-fold higher than densities recorded during autumn (0.4 ind. m~(-2)) and winter (0.2 ind. m~(-2)). Comparison of length-frequency distributions and sex ratios, particularly between shallow (0-200 m) and deep (0-2000 m) samples taken during winter, suggest a seasonal vertical migration. A large proportion of the adult population seems to migrate to greater depth during winter, possibly as an overwintering strategy. Further, the demographic data and a set of growth models suggest that females and males have deviating life history traits. Females grow to larger size but their growth rate is slower, and they may mature later than males. The presence of mature males and females with spermatophores attached during late June to August indicated that spawning had already started during mid-winter conditions. These data, which were uniquely sampled in the same region from summer to winter, provide a new perspective on the seasonal behavior and general life history of T. macrura.
机译：尽管Thysanoessa macrura是南大洋中最丰富和分布最广泛的古猿种之一，但对其季节性分布和越冬策略的了解仍然很少。我们描述了南极大西洋东南部的拉扎列夫海中3个季节T. macrura的丰度，人口统计学和分布的变化。在所有季节，成年和幼体中华mac均在拉扎列夫海广泛分布，但成年种群的季节性变化较大。平均夏季密度（2005/06和2007/08年分别为4.9和7.0 ind。m〜（-2））比秋天（0.4 ind。m〜（-2））和冬季（冬天，平均密度）高20倍。 0.2英寸m〜（-2））。比较长度-频率分布和性别比，尤其是在冬季采集的浅层（0-200 m）和深层（0-2000 m）样本之间，表明存在季节性垂直迁移。在冬季，很大一部分成年人口似乎迁移到更深处，可能是越冬策略。此外，人口统计数据和一组增长模型表明，男性和女性具有不同的生活史特征。雌性长大，但生长速度较慢，可能比雄性成熟晚。在6月下旬至8月期间，有附有精母细胞的成年雄性和雌性的存在表明产卵已经在冬季中期开始。这些数据是从夏季到冬季在同一地区进行的唯一采样，从而提供了关于斑纹线虫的季节性行为和一般生活史的新观点。

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