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首页> 外文期刊>Marine ecology progress series >Somatic and molt production in Euphausia mucronata off central-southern Chile: the influence of coastal upwelling variability
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Somatic and molt production in Euphausia mucronata off central-southern Chile: the influence of coastal upwelling variability

机译：智利中南部附近海域Euphausia mucronata的体细胞和蜕皮产生：沿海上升变化的影响

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摘要

Seasonal and inter-annual variability in population abundance, biomass, and somatic and molt production of the Humboldt Current krill Euphausia mucronata were studied during a monthly time series (August 2002 to June 2007) at Stn 18 (36° 30' S, 73° 07' W) off central-southern Chile. Experimental measurements in krill were performed at Stn 18 (in 2007 and 2008) and northern Chile (2010) in order to estimate vital rates for use in E. mucronata secondary production calculation at Stn 18. Coastal upwelling intensity was the main oceanographic process found to control E. mucronata population abundance and biomass production on seasonal and inter-annual time scales. Spawning peaks and population structure indicate that E. mucronata produces at least 2 generations per year. The main spawning period occurs during the austral spring when phytoplankton concentration is high. A second, less intense spawning period occurs at the end of the austral summer and early autumn. E. mucronata had a mean biomass of 100 mg C m~(-3) and an integrated annual secondary production of 2432 mg C m~(-3) yr~(-1), with an overall production/ biomass ratio (P/B) ratio of 24. In May 2007, a maximum daily integrated biomass of 5 g C m~(-3) and total daily secondary production of 63 mg C m~(-3) d~(-1) were observed. These estimates are considerably higher than those reported for other krill species in coastal upwelling regions. Multivariate analyses indicate that upwelling-favorable winds promote high E. mucronata biomass and secondary production, but higher abundance and biomass were found during the transition periods from upwelling to downwelling conditions. Results suggest that E. mucronata has a highly efficient behavioral strategy to attain high production rates and recover rapidly from potential offshore losses due to advective processes in a highly productive coastal upwelling ecosystem.
机译：在每月的时间序列（2002年8月至2007年6月），在Stn 18（36°30'S，73°），研究了洪堡当前磷虾Euphausia mucronata的种群丰度，生物量以及体细胞和蜕皮产量的季节性和年际变化。智利中南部，离开07'W）。在Stn 18（分别在2007年和2008年）和智利北部（2010年）对磷虾进行了实验测量，以估算在Stn 18进行粘虫大肠埃希菌次级生产计算中使用的生命率。沿海上升强度是在季节和年际时间尺度上，控制粘虫（E. mucronata）的种群丰度和生物量生产。产卵高峰和种群结构表明，粘液肠杆菌每年产生至少2代。主要产卵期发生在南极春季，浮游植物浓度很高。在南方夏季结束和初秋结束时，发生了第二个强度较小的产卵期。 E. mucronata的平均生物量为100 mg C m〜（-3），年综合次级生产量为2432 mg C m〜（-3）yr〜（-1），总产量/生物量比（P / B）比率为24。在2007年5月，观察到最大每日综合生物量为5 g C m〜（-3），日总次级生产量为63 mg C m〜（-3）d〜（-1）。这些估计数大大高于沿海上升区其他磷虾物种的估计数。多变量分析表明，有利于上升的风促进了粘虫大肠埃希菌的生物量和次级生产，但是在从上升到落水的过渡时期，发现了较高的丰度和生物量。结果表明，粘液大肠埃希菌具有高效的行为策略，可实现高生产率并在高产沿海上升流生态系统中由于对流过程而迅速从潜在的海上损失中恢复过来。

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