Disentangling top-down drivers of mortality underlying diel population dynamics of Prochlorococcus in the North Pacific Subtropical Gyre.
Journal
Nature communications
ISSN: 2041-1723
Titre abrégé: Nat Commun
Pays: England
ID NLM: 101528555
Informations de publication
Date de publication:
07 Mar 2024
07 Mar 2024
Historique:
received:
15
05
2023
accepted:
16
02
2024
medline:
8
3
2024
pubmed:
8
3
2024
entrez:
7
3
2024
Statut:
epublish
Résumé
Photosynthesis fuels primary production at the base of marine food webs. Yet, in many surface ocean ecosystems, diel-driven primary production is tightly coupled to daily loss. This tight coupling raises the question: which top-down drivers predominate in maintaining persistently stable picocyanobacterial populations over longer time scales? Motivated by high-frequency surface water measurements taken in the North Pacific Subtropical Gyre (NPSG), we developed multitrophic models to investigate bottom-up and top-down mechanisms underlying the balanced control of Prochlorococcus populations. We find that incorporating photosynthetic growth with viral- and predator-induced mortality is sufficient to recapitulate daily oscillations of Prochlorococcus abundances with baseline community abundances. In doing so, we infer that grazers in this environment function as the predominant top-down factor despite high standing viral particle densities. The model-data fits also reveal the ecological relevance of light-dependent viral traits and non-canonical factors to cellular loss. Finally, we leverage sensitivity analyses to demonstrate how variation in life history traits across distinct oceanic contexts, including variation in viral adsorption and grazer clearance rates, can transform the quantitative and even qualitative importance of top-down controls in shaping Prochlorococcus population dynamics.
Identifiants
pubmed: 38453897
doi: 10.1038/s41467-024-46165-3
pii: 10.1038/s41467-024-46165-3
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
2105Subventions
Organisme : Simons Foundation
ID : 549894
Organisme : Simons Foundation
ID : 827829
Organisme : Simons Foundation
ID : 329108
Organisme : Simons Foundation
ID : 329108
Organisme : Simons Foundation
ID : 329108
Organisme : Simons Foundation
ID : 329108
Organisme : Simons Foundation
ID : 574495
Organisme : Simons Foundation
ID : 721231
Organisme : Simons Foundation
ID : 329108
Informations de copyright
© 2024. The Author(s).
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