Collaborative Research: Reproductive Periodicity in Planktonic Sarcodines: Implications for Temporal Variability in Abundance and Flux

9317739 Michaels 共生浮游肉鱼（棘鱼、放射虫和有孔虫）是海洋群落表层水中最显着的微型/大型浮游动物类群之一。 由于它们在这些环境中的能量流、营养循环和垂直通量中的重要性，它们也是研究最少的植物之一。 浮游肉碱在海洋浮游生物群落中 70 um 有机体（通过其细胞内共生藻类）生产有机物质方面发挥着重要作用。 此外，由于它们的大尺寸（以及因此它们潜在的快速下沉速率），它们在离开混合层的物质通量中也发挥着比它们对浮游生物量的总体贡献所预测的更大的作用。 先前的研究表明，表面生产力和从混合层流出的肉鱼物质通量存在很大差异，这可能与某些共生体浮游肉鱼物种的繁殖周期性或导致种群快速增长的偶发事件有关。 该项目将检验这一假设，并确定这些周期性在多大程度上控制浮游肉鱼对百慕大附近贫营养大西洋表层水域初级生产的重要性以及它们从该地点表层水域流出的重要性的时间变化。 *** 共生浮游肉鱼（棘鱼、放射虫和有孔虫）是海洋群落表层水域中最显着的微型/大型浮游动物类群之一。 由于它们在这些环境中的能量流、营养循环和垂直通量中的重要性，它们也是研究最少的植物之一。 浮游肉碱在海洋浮游生物群落中 70 um 有机体（通过其细胞内共生藻类）生产有机物质方面发挥着重要作用。 此外，由于它们的大尺寸（以及因此可能的快速下沉速率），它们在混合层物质流出方面也发挥着比它们对浮游生物量的总体贡献所预测的更大的作用。 先前的研究表明，表面生产力和从混合层流出的肉鱼物质通量存在很大差异，这可能与某些共生体浮游肉鱼物种的繁殖周期性或导致种群快速增长的偶发事件有关。 该项目将检验这一假设，并确定这些周期性在多大程度上控制浮游肉鱼对百慕大附近贫营养大西洋表层水域初级生产的重要性以及它们从该地点表层水域流出的重要性的时间变化。 ***

9317739 Michaels The symbiont-bearing planktonic sarcodines (Acantharia, Radiolaria and Foraminifera) are one of the most conspicuous groups of micro- /macrozooplankton in the surface waters of oceanic communities. They are also one of the least studied for their importance in energy flow, nutrient cycles and vertical fluxes in these environments. Planktonic sarcodines play an important role in the production of organic material by organisms 70 um in oceanic plankton communities (via their intracellular symbiotic algae). Moreover, by virtue of their large size (and consequently their potentially rapid sinking rates) they also play a greater role in the flux of material out of the mixed layer than would be predicted by their overall contribution to planktonic biomass. Previous studies indicate great variability in the surface productivity and flux of sarcodine material out of the mixed layer that may be related to the reproductive periodicities of some species of symbiont-bearing planktonic sarcodines or to episodic events leading to rapid population growth. This project will test this hypothesis, and determine the extent to which these periodicities control the temporal changes in the importance of planktonic sarcodines to primary production in the surface waters of the oligotrophic Atlantic Ocean near Bermuda, and to their flux out of the surface waters at this site. *** The symbiont-bearing planktonic sarcodines (Acantharia, Radiolaria and Foraminifera) are one of the most conspicuous groups of micro- /macrozooplankton in the surface waters of oceanic communities. They are also one of the least studied for their importance in energy flow, nutrient cycles and vertical fluxes in these environments. Planktonic sarcodines play an important role in the production of organic material by organisms 70 um in oceanic plankton communities (via their intracellular symbiotic algae). Moreover, by virtue of their large size (and consequently their po tentially rapid sinking rates) they also play a greater role in the flux of material out of the mixed layer than would be predicted by their overall contribution to planktonic biomass. Previous studies indicate great variability in the surface productivity and flux of sarcodine material out of the mixed layer that may be related to the reproductive periodicities of some species of symbiont-bearing planktonic sarcodines or to episodic events leading to rapid population growth. This project will test this hypothesis, and determine the extent to which these periodicities control the temporal changes in the importance of planktonic sarcodines to primary production in the surface waters of the oligotrophic Atlantic Ocean near Bermuda, and to their flux out of the surface waters at this site. ***