A long-term information baseline is necessary to identify the seasonal and interannual variability of diatom production driven by environmental dynamics. This motivated our compiling hydrographic data and concurrent diatom fluxes at the Alfonso Basin sub-zone. The diatom data time series spanned from February 2008 to September 2012. These data were analyzed along with primary productivity and chlorophyll-a concentration estimates derived from satellite imagery from 2002 to 2012. Planktonic diatom flux (range: 1.62 × 10⁶–3.55 × 10⁷ valves·m^-2d^-1) was significantly correlated (r² = 0.37) with chlorophyll-a concentration. The bimodal production season (December–July) exhibited a winter mixing period influenced by water from the Gulf of California. The diatom flux was dominated by fast-growing surface species such as Chaetoceros spp. and Thalassiosira spp. The second peak in May occurred under the influence of southwest winds concurrent with the entry of tropical surface water and a cyclonic eddy that injected nutrients into the base of the euphotic zone, eliciting a bloom of Pseudo-nitzschia spp. The summer stratification resulted in the deepening of Subtropical Subsurface Water, and the diatom flux included large species of oceanic affinity such as Chaetoceros (Phaeoceros), Rhizosolenia acuminata, and Rh. imbricata. The environment at Alfonso Basin promotes diatom sinking; thus, material from sediment traps accurately reflects the primary production cycle associated with hydrographic processes. Interannual variability was characterized by anomalously low diatom fluxes between August 2009 and July 2010. A significant negative association between diatom flux anomalies and El Niño Modoki Index values suggests that oceanographic changes are related to this event. Additional reductions in diatom fluxes were coeval with SST positive anomalies recorded from July to February 2008–2009 and 2011–2012, which showed a significant relationship with the tropical Pacific Meridional Mode. The temporal trends like the additive signals of interannual (CP-El Niño) and decadal (Pacific Meridional Mode) time scales indicate that climatic disturbances affected the local ecosystem in the basin, reducing the vertical flux of diatoms initially dominated by Pseudo-nitzschia spp., and boosting the presence of oceanic warm-water species and small highly silicified species such as Thalassionema nitzschioides var. parva.

长期信息基线对于确定由环境动态驱动的硅藻生产的季节性和年际变化是必要的。这促使我们在阿方索盆地分区编译水文数据和并发硅藻通量。硅藻数据时间序列跨越 2008 年 2 月至 2012 年 9 月。这些数据与2002 年至 2012 年卫星图像得出的初级生产力和叶绿素a浓度估计值一起进行了分析。浮游硅藻通量（范围：1.62 × 10 ⁶ –3.55 × 10 ^{7 个}阀门·m ^-2 d ^-1 ) 与叶绿素-a显着相关 (r 2 ⁼  0.37)专注。双峰生产季节（12 月至 7 月）表现出受加利福尼亚湾水影响的冬季混合期。硅藻通量以快速生长的表面物种为主，例如角毛藻属。和Thalassiosira spp。5 月的第二个高峰发生在西南风的影响下，同时热带地表水进入，气旋涡流将营养物质注入到透光带底部，引发了Pseudo-nitzschia spp。夏季分层导致亚热带地下水加深，硅藻通量包括大洋亲和物种，如角毛藻（ Phaeoceros）、Rhizosolenia acuminata和RH。灰烬. 阿方索盆地的环境促使硅藻下沉；因此，来自沉积物陷阱的材料准确地反映了与水文过程相关的初级生产周期。年际变率的特点是 2009 年 8 月至 2010 年 7 月期间硅藻通量异常低。硅藻通量异常与厄尔尼诺莫多基指数值之间的显着负相关表明海洋变化与这一事件有关。硅藻通量的额外减少与 2008-2009 年 7 月至 2009 年 2 月和 2011-2012 年 7 月至 2 月记录的 SST 正异常同时发生，这表明与热带太平洋经向模式有显着关系。Pseudo-nitzschia spp.，并增加海洋温水物种和小型高度硅化物种（如Thalassionema nitzschioides var.）的存在。帕尔瓦_