期刊
JOURNAL OF PLANKTON RESEARCH
卷 33, 期 12, 页码 1825-1841出版社
OXFORD UNIV PRESS
DOI: 10.1093/plankt/fbr077
关键词
picophytoplankton; spatial and temporal dynamics; coastal upwelling and downwelling; chlorophyll fluorescence maximum; South Australia
资金
- Australian Government through the National Collaborative Research Infrastructure Strategy
- Super Science Initiative
- Australian Research Council [DP0664681]
- Australian Research Council [DP0664681] Funding Source: Australian Research Council
We investigated the space-time dynamics of picophytoplankton in South Australian continental shelf waters from February 2008 to January 2009, focusing on localized physical events. We discriminated six picophytoplankton populations by flow cytometry, including Synechococcus (SYN1, SYN2), Prochlorococcus (PROC1, PROC2) and small and large picoeukaryotes (EUKS, EUKL). Local physical events observed included downwelling and dense waters outflowing from a nearby gulf in winter-early spring 2008, upwelling in summer and early spring 2008 and eddy formation in January 2009. Each population responded differently to these events, which resulted in up to four orders of magnitude changes in their abundances. Population-specific hotspots reflected a succession of distinct dominant communities associated with the strength of upwelling events, changes in fluorescence maximum depths and local downwelling and mixing processes. The unexpected high abundances and local dominance of Prochlorococcus in summer reflected the possible influence of eastward and westward current transports and the presence of a High-Light (PROC1)-and Low-Light (PROC2)-adapted ecotypes. This study highlights the role of localized physical events in the dominance of all three picophytoplankton groups that may be critical for the high productivity of the study region, and suggests the importance of hydroclimatic forcing for inter-annual changes in picophytoplankton communities.
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