Phytoplankton mortality in a changing thermal seascape.
Phaeodactylum tricornutum
cell death
global warming
mortality rate
thermal acclimation
thermal response
tipping points
Journal
Global change biology
ISSN: 1365-2486
Titre abrégé: Glob Chang Biol
Pays: England
ID NLM: 9888746
Informations de publication
Date de publication:
10 2021
10 2021
Historique:
received:
21
04
2021
accepted:
13
06
2021
pubmed:
27
6
2021
medline:
21
10
2021
entrez:
26
6
2021
Statut:
ppublish
Résumé
Predicting spatiotemporal distributions of phytoplankton biomass and community composition heavily relies on experimental studies that document how environmental conditions influence population growth rates. In unicellular phytoplankton, the net population growth rate is the difference between the cell division rate and the death rate. Along with predation and disease, phytoplankton mortality arises from abiotic stress. Although the effect of temperature on the net population growth rate is well understood, studies examining thermally induced death rates in phytoplankton are scarce. We investigated how cell division and death rates of the diatom Phaeodactylum tricornutum varied within its thermal tolerance limits (thermal niche), and at temperatures just above its upper thermal tolerance limit. We show that death rates were largely independent of temperature when P. tricornutum was grown within its thermal niche, but increased significantly at temperatures that approached or exceeded its upper thermal tolerance limit. Furthermore, the sensitivity of mortality increased with the duration of exposure to heat stress and was affected by the pre-acclimation temperature. Heat waves can be expected to significantly affect phytoplankton mortality episodically. The increasing frequency of heat waves accompanying global warming can be expected to drive changes in phytoplankton community structure due to interspecific variability of thermal niches with potential implications for food web dynamics and biogeochemical cycles.
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
5253-5261Informations de copyright
© 2021 The Authors. Global Change Biology published by John Wiley & Sons Ltd.
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