Thermal performance of the heterotrophic dinoflagellate <i>Oxyrrhis marina</i> under long-term warming and acute heat stress.

ABSTRACT: We investigated the thermal tolerance and physiological responses of the heterotrophic dinoflagellate Oxyrrhis marina reared for more than 34 months at 16, 19 or 22°C, using Rhodomonas salina as prey. First, we constructed the thermal performance curves for the growth rate of the three thermal lines of O. marina and found that the maximum growth rates and the optimum temperature increased with higher rearing temperature. Next, we examined the functional responses at each rearing temperature and under acute heat stress (+3°C). Maximum ingestion rates (in cells and carbon) showed limited temperature sensitivity, regardless of chronic or acute heat exposure. Under heat stress, the 16 and 19°C lines saturated at lower prey abundances and showed enhanced clearance rates, wh

SUBMITTER: Garcia-Martinez M 

PROVIDER: S-EPMC12343005 | biostudies-literature | 2025 Sep-Oct

REPOSITORIES: biostudies-literature