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

小行星9314533 浮游有孔虫、放射虫和有孔虫是海洋沃茨水体中最重要的微型/大型浮游动物类群之一。 它们在这些环境中的能量流动、养分循环和垂直通量方面的重要性也是研究最少的。 在海洋浮游生物群落中70 μ m以下的生物体（通过其细胞内共生藻类）生产有机物质时，浮游生物肌氨酸类起着重要作用。 此外，由于它们的大尺寸（因此其潜在的快速下沉率），它们在混合层的物质通量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。 以前的研究表明，表面生产力和肉丁材料的混合层，这可能是有关的一些物种的共生轴承的共生肉丁或情节性事件导致人口快速增长的生殖周期性通量的巨大变化。 本项目将测试这一假设，并确定在何种程度上这些周期性控制的时间变化的重要性，在百慕大附近的贫营养大西洋的表面沃茨的初级生产，并在这个网站的表面沃茨的流量。 ***

9314533 Caron 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. ***