Research progress and prospects of microbial adaptation induced by coastal frontal hydrodynamic activity
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摘要:
海洋锋面是河口-近海连续体中重要的(亚−)中尺度物理过程,调控着微生物群落的多样性、分布格局及生态功能。基于已有研究,本文系统综述了悬沙锋、羽流锋、上升流锋面、潮汐锋面以及陆架坡折锋的固有特性、形成机制及生态效应;重点阐明锋面动力过程(辐聚效应、次级环流与垂向混合等)如何通过驱动环境梯度、营养输运和有机颗粒物迁移,影响微生物群落的种群多样性、组装模式、代谢功能及生物地球化学循环。锋面的水动力过程可以为浮游微生物获取营养物质、进行生物生命活动提供便利的途径及机械动能。锋面辐聚效应可以改善锋区光照条件,提升锋区的初级生产力,进而影响微生物群落的结构多样性与营养循环。锋面系统的横向输运与垂向混合过程则显著影响着微生物群落的分布模式、胞外酶的活性表达及群落的扩散与融合。基于前人研究,本文还总结了随机性过程(如扩散限制)和确定性过程对锋面微生物群落组装的相对重要性,并探讨了种间关系等生物相互作用的重要性。
Abstract:Marine fronts are critical sub-mesoscale physical processes in the estuary-coastal ocean continuum, regulating microbial diversity, distribution patterns, and ecological functions. We systematically reviewed the characteristics, formation mechanisms, and ecological effects of the sediment front, plume front, and upwelling front, focusing on how the frontal dynamic processes (e.g., convergence effect, secondary circulation, and vertical mixing) influenced the microbial community diversity, assembly processes, metabolic functions, and biogeochemical cycles by driving the environmental gradients, nutrient transport, and particulate organic matter transport pattern. Frontal physical processes provided crucial pathways and mechanical energy for planktonic microbes to acquire nutrients and sustain biological activities. The frontal convergence effect improved the light condition, significantly elevating primary productivity in the frontal zone, thereby driving microbial enrichment and nutrient cycling. The lateral transport and vertical mixing processes of frontal zones profoundly influenced microbial community distribution patterns, extracellular enzyme activity, and dispersal-fusion dynamics. In addition, we summarized the relative importance of stochastic (e.g., dispersal limitation) and deterministic processes in microbial community assembly within frontal zones, and highlighted the role of interspecies interaction in shaping community structure.
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表 1 河口及沿岸海域常见的锋面类型及其水动力特征与生态效应
Table 1. The common types, hydrodynamic characteristics, and ecological effects of estuarine and coastal fronts
锋面类型 水动力机制 典型特征及生态效应 悬沙锋 辐聚效应、潮汐混合、再悬浮、絮凝、湍流等过程 改善远岸侧的光照条件,阻碍颗粒物及营养物质的跨锋面输运,
加强垂直水柱的混合等[25-27, 29, 34-36]羽流锋 辐聚效应、水体层化等过程 提高初级生产力及生物量的累积等[29, 31, 33, 37, 38] 上升流锋面 辐聚效应/辐散效应、上升流等过程 将底层营养物质传输至真光层,提高初级生产力及生物量的
累积等[30, 31, 33, 39-43]潮汐锋面 辐聚效应、潮汐混合、湍流等过程 改变颗粒物及营养物质的跨锋面输运模式等[4, 44] 陆架坡折锋 垂直混合等过程 将底层营养物质传输至真光层,提高初级生产力及生物量的累积[4, 16-17, 45] -
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