In:
Journal of Eukaryotic Microbiology, Wiley, Vol. 68, No. 4 ( 2021-07)
Abstract:
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.
Type of Medium:
Online Resource
ISSN:
1066-5234
,
1550-7408
Language:
English
Publisher:
Wiley
Publication Date:
2021
detail.hit.zdb_id:
2126326-7
SSG:
12
