Physiological Responses of Mesodinium major to Irradiance, Prey Concentration and Prey Starvation.
Teleaulax
C-fixation
Chl. a
growth
light response
sequestered chloroplasts
sequestered nucleus
Journal
The Journal of eukaryotic microbiology
ISSN: 1550-7408
Titre abrégé: J Eukaryot Microbiol
Pays: United States
ID NLM: 9306405
Informations de publication
Date de publication:
18 Apr 2021
18 Apr 2021
Historique:
received:
23
02
2021
accepted:
31
03
2021
pubmed:
19
4
2021
medline:
19
4
2021
entrez:
18
4
2021
Statut:
aheadofprint
Résumé
Ciliates within the Mesodinium rubrum/Mesodinium major species complex harbor chloroplasts and other cell organelles from specific cryptophyte species. Mesodinium major was recently described, and new studies indicate that blooms of M. major are just as common as blooms of M. rubrum. Despite this, the physiology of M. major has never been studied and compared to M. rubrum. In this study, growth, food uptake, chlorophyll a and photosynthesis were measured at six different irradiances, when fed the cryptophyte, Teleaulax amphioxeia. The results show that the light compensation point for growth of M. major was significantly higher than for M. rubrum. Inorganic carbon uptake via photosynthesis contributed by far most of total carbon uptake at most irradiances, similar to M. rubrum. Mesodinium major cells contain ~four times as many chloroplast as M. rubrum leading to up to ~four times higher rates of photosynthesis. The responses of M. major to prey starvation and refeeding were also studied. Mesodinium major was well adapted to prey starvation, and 51 d without prey did not lead to mortality. Mesodinium major quickly recovered from prey starvation when refed, due to high ingestion rates of > 150 prey/predator/d.
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
e12854Subventions
Organisme : Det Frie Forskningsråd
ID : 4181-00484
Informations de copyright
© 2021 International Society of Protistologists.
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