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Picophytoplankton are a ubiquitous component of marine plankton communities and are expected to be favored by global increases in seawater temperature and stratification associated with climate change. Eukaryotic and prokaryotic picophytoplankton have distinct ecology, and global models predict that the two groups will respond differently to future climate scenarios. At a nearshore observatory on the Northeast US Shelf, however, decades of year-round monitoring have shown these two groups to be highly synchronized in their responses to environmental variability. To reconcile the differences between regional and global predictions for picophytoplankton dynamics, we here investigate the picophytoplankton community across the continental shelf gradient from the nearshore observatory to the continental slope. We analyze flow cytometry data from 22 research cruises, comparing the response of picoeukaryote and Synechococcus communities to environmental variability across time and space. We find that the mechanisms controlling picophytoplankton abundance differ across taxa, season, and distance from shore. Like the prokaryote, Synechococcus, picoeukaryote division rates are limited nearshore by low temperatures in winter and spring, and higher temperatures offshore lead to an earlier spring bloom. Unlike Synechococcus, picoeukaryote concentration in summer decreases dramatically in offshore surface waters and exhibits deeper subsurface maxima. The offshore picoeukaryote community appears to be nutrient limited in the summer and subject to much greater loss rates than Synechococcus. This work both produces and demonstrates the necessity of taxon- and site-specific knowledge for accurately predicting the responses of picophytoplankton to ongoing environmental change.

Titel:	Distinct responses to warming within picoplankton communities across an environmental gradient.
Autor/in / Beteiligte Person:	Stevens, BLF ; Peacock, EE ; Crockford, ET ; Shalapyonok, A ; Neubert, MG ; Sosik, HM
Link:	Zum Volltext
Zeitschrift:	Global change biology, Jg. 30 (2024-05-01), Heft 5, S. e17316
Veröffentlichung:	<Jan. 2013-> : Oxford : Blackwell Pub. ; <i>Original Publication</i>: Oxford, UK : Blackwell Science, 1995-, 2024
Medientyp:	academicJournal
ISSN:	1365-2486 (electronic)
DOI:	10.1111/gcb.17316
Schlagwort:	Seawater chemistry Temperature Synechococcus physiology Synechococcus growth & development Climate Change Phytoplankton physiology Seasons
Sonstiges:	Nachgewiesen in: MEDLINE Sprachen: English Publication Type: Journal Article Language: English [Glob Chang Biol] 2024 May; Vol. 30 (5), pp. e17316. MeSH Terms: Synechococcus* / physiology ; Synechococcus* / growth & development ; Climate Change* ; Phytoplankton* / physiology ; Seasons* ; Seawater / chemistry ; Temperature References: Alegria Zufia, J., Farnelid, H., & Legrand, C. (2021). Seasonality of coastal picophytoplankton growth, nutrient limitation, and biomass contribution. Frontiers in Microbiology, 12, 786590. https://doi.org/10.3389/fmicb.2021.786590. ; Archibald, K. (2021). The role of zooplankton in regulating carbon export and phytoplankton community structure: Integrating models and observations. 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Grant Information: Audacious Project; 561126 Simons Foundation; 1655686 Division of Ocean Sciences; 1657803 Division of Ocean Sciences; 2322676 Division of Ocean Sciences Contributed Indexing: Keywords: LTER; coastal ecology; continental shelf; niche correlation model; picophytoplankton; realized niche; stratification Entry Date(s): Date Created: 20240520 Date Completed: 20240520 Latest Revision: 20240520 Update Code: 20240520

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Distinct responses to warming within picoplankton communities across an environmental gradient.