Dataset Information

Zinc-iron co-limitation of natural marine phytoplankton assemblages in coastal Antarctica

ABSTRACT: As an essential micronutrient that is scarce in surface ocean waters, zinc (Zn) has the potential to limit oceanic photosynthetic productivity and influence the global carbon cycle. Here we observed Zn co-limitation with iron (Fe) in the natural phytoplankton community of Terra Nova Bay, Antarctica, induced by the drawdown of seawater CO2 and dZn during a bloom. Incubations amended with Zn resulted in significantly higher chlorophyll a content and greater macronutrient and dissolved inorganic carbon drawdown compared to Fe addition alone. Multiple Zn and Fe response proteins were observed in experimental and water column samples demonstrating co-stress in various algal taxa. Together these results demonstrate that Zn limitation can occur in productive Antarctic coastal ecosystems. Thus, Zn may be an important factor limiting the total productivity potential of marine phytoplankton.

INSTRUMENT(S):

ORGANISM(S): Phytoplankton Metagenome

TISSUE(S): Photosynthetic Cell

DISEASE(S): Disease Free

SUBMITTER: Matthew McIlvin

LAB HEAD: Mak Saito

PROVIDER: PXD037056 | Pride | 2025-09-29

REPOSITORIES: Pride

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			Action	DRS
	211213_2D_2ug_ciclops_st27_464m_02um.mzid.gz	Mzid
	211213_2D_2ug_ciclops_st27_464m_02um.mzid_211213_2D_2ug_ciclops_st27_464m_02um.MGF	Mzid
	211213_2D_2ug_ciclops_st27_464m_3um.mzid.gz	Mzid
	211213_2D_2ug_ciclops_st27_464m_3um.mzid_211213_2D_2ug_ciclops_st27_464m_3um.MGF	Mzid
	211213_2D_2ug_ciclops_st27_464m_51um.mzid.gz	Mzid

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Project description:Marine phytoplankton are a diverse group of photoautotrophic organisms and key mediators in the global carbon cycle. Phytoplankton physiology and biomass accumulation are closely tied to mixed layer depth, but the intracellular metabolic pathways activated in response to changing mixed layer depths remain unexplored. Here, metatranscriptomics was used to characterize the phytoplankton community response to a mixed layer shallowing from 233 meters to 5 meters over the course of two days during the late spring in the Northwest Atlantic. Most phytoplankton genera downregulated core photosynthesis, carbon storage, and carbon fixation genes as the system transitioned from a deep to a shallow mixed layer and shifted towards catabolism of stored carbon ic pathways supportive of rapid cell growth. In contrast, phytoplankton genera exhibited divergent transcriptional strategies for photosystem light harvesting complex genes during this transition. Active infection, taken as the ratio of virus to host transcripts, increased in the Bacillariophyta (diatom) phylum and decreased in the Chlorophyta (green algae) phylum upon mixed layer shallowing. A conceptual model is proposed to provide ecophysiological context for our findings, in which light limitation during deep mixing induces populations into a transcriptional state which maximizes interrupts the oscillating levels of transcripts related to photosynthesis, carbon storage, and carbon fixation found in shallow mixed layers with relatively higher growth rates. We propose that upon sensing high light levels during mixed layer shallowing, phytoplankton resume diel oscillation of core sets of genes enabling photoprotection, biosynthesis and cell replication. Our findings highlight the shared and unique transcriptional response strategies within phytoplankton communities acclimating to the dynamic light environment associated with transient deep mixing and shallowing events during the annual North Atlantic bloom.

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Zinc-iron co-limitation of natural marine phytoplankton assemblages in coastal Antarctica

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