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首页> 外文期刊>Estuarine Coastal and Shelf Science >Larvacean (Chordata, Tunicata) abundance and inferred secondary production off southeastern Brazil
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Larvacean (Chordata, Tunicata) abundance and inferred secondary production off southeastern Brazil

机译：Larvacean（Chordata，Tunicata）的丰度和推断巴西东南部沿海地区的次级生产

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摘要

We studied the temporal and vertical variability in larvacean abundance and secondary production on a fixed station off southeast Brazil, from January 2007 to December 2008. Larvacean biomass was derived from length-weight regressions, and growth rates were estimated from an empirical model. We identified eleven larvacean species. Oikopleura longicauda occurred throughout the studied period and was the most abundant species, followed by Oikopleura fusiformis. Fritillaria haplostoma, O. fiisiformis and O. longicauda were found mainly above the thermocline, whereas Oikopleura dioica and Fritillaria pellucida preferred bottom layers. Higher abundance and biomass were observed in warmer months, when the water column was stratified as a result of the bottom intrusions of the cold and nutrient-rich South Atlantic Central Water. Secondary production mirrored the biomass seasonal pattern. Larvacean biomass equaled to less than 10% of copepod biomass during the same period, but larvacean production comprised on average 77% that of copepods, whereas the production of discarded houses and fecal pellets comprised up to 2800% of larvaceans secondary production. This confirms the potential significance of larvaceans in the carbon flux in tropical and subtropical coastal regions.
机译：我们研究了2007年1月至2008年12月在巴西东南部某个固定站点上的幼虫丰富度和次级生产的时间和垂直变化。幼虫生物量来自长度-重量回归，并根据经验模型估算增长率。我们确定了11种幼虫。在整个研究过程中，长鳍金枪鱼（Oikopleura longicauda）发生率最高，其次是鼠尾金龟子。贝母贝母，O。fiisiformis和O. longicauda主要在温跃层以上，而Oikopleura dioica和贝母Felillaria pellucida是最下层。在较温暖的月份，由于冷和富含营养的南大西洋中央水的底部侵入而使水柱分层时，观测到较高的丰度和生物量。二级生产反映了生物量的季节性模式。同期，幼虫的生物量不到co足类生物量的10％，但幼虫的平均产量为co足类动物的77％，而废弃房屋和粪便的产量占幼虫二级生产的2800％。这证实了幼虫在热带和亚热带沿海地区碳通量中的潜在重要性。

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