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首页> 外文期刊>Marine ecology progress series >Long-term time-series study of salp population dynamics in the Sargasso Sea
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Long-term time-series study of salp population dynamics in the Sargasso Sea

机译：藻类海中Sea鱼种群动态的长期时间序列研究

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摘要

Salps are bloom-forming, pelagic tunicates with high grazing rates on phytoplank-ton, with the potential to greatly increase vertical particle flux through rapidly sinking fecal pellets. However, the frequency and causes of salp blooms are not well known. We quantified salps from day and night zooplankton net tows in the epipelagic zone of the North Atlantic subtropical gyre as part of the Bermuda Atlantic Time-series Study (BATS). Salp species and size were quantified in biweekly to monthly tows from April 1994 to November 2011. Twenty-one species of salps occurred at the BATS site over this time period, and the most common bloom-forming salps were Thalia democratica, Salpa fusiformis, Weelia (Salpa) cylindrica, Cyclosalpa polae, and Iasis zonaria. Five species of salps exhibited diel vertical migration, and salp abundances varied seasonally, with T. democratica, S. fusiformis, and C. polae blooms coincident with the spring phyto-plankton bloom, and W. cylindrica blooms occurring more often in late summer. For T democratica, mean annual biomass increased slightly over the time series and was elevated every 3 yr, and biomass increased in the presence of cyclonic mesoscale eddies. Decadal climate oscillations and biogeochemical conditions influenced multi-year trends in salp abundance and biomass. Both total salp and T. democratica abundance were positively correlated with primary production, total salp biomass was positively correlated with the North Pacific Gyre Oscillation, and T. democratica biomass was negatively correlated with the Pacific Decadal Oscillation. These salp bloom dynamics have important implications for planktonic food web interactions and biogeochemical cycling.
机译：结缕草是形成花的上层被膜，在浮游植物上具有高放牧率，并有可能通过迅速下沉的粪便团粒大大增加垂直颗粒通量。但是，油菜花大量出现的频率和原因尚不清楚。作为百慕达大西洋时间序列研究（BATS）的一部分，我们对北大西洋亚热带回旋上流带昼夜浮游动物网状拖曳的浮游植物进行了量化。从1994年4月至2011年11月，每两周到每月一次拖曳对的种类和大小进行定量。在这段时间内，BATS站点发生了21种sal，最常见的开花形成sal为塔利亚·迪亚加，沙地参，韦利亚。 （Salpa）cylindrica，Cyclosalpa polae和Iasis zonaria。五种小种草表现出diel垂直迁移，并且小草丰度随季节而变化，其中民主草，梭状芽胞杆菌和短小孢子的花期与春季浮游植物的花期重合，而西林花的花期在夏末更频繁。对于民主民主党，平均年生物量随时间序列略有增加，并且每3年增加一次，并且在旋风中尺度涡旋的存在下生物量也增加。年代际气候的振荡和生物地球化学条件影响了鲑鱼数量和生物量的多年趋势。总草皮和and草的丰度与初级生产呈正相关，总草皮生物量与北太平洋回旋涛动呈正相关，而草木T生物量与太平洋十进制涛动呈负相关。这些草屑水华动态对浮游食物网相互作用和生物地球化学循环具有重要意义。

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