Effects of temperature on the bioenergetics of the marine protozoans Gyrodinium dominans and Oxyrrhis marina [Dataset]

We aimed at studying the mechanisms underneath the ascending and descending sections of the thermal performance curves in marine protozoans. To do so, we exposed Gyrodinium dominans and two strains of Oxyrrhis marina from different origins to three temperatures representative of each section of the thermal response curve (12ºC, ascending section; 18ºC, top; 25ºC, descending section). As variables, we measured growth, ingestion, and respiration rates (this latter with and without food). The growth rates of O. marina strains plotted as a function of temperature showed a triangular response with maximum values at the intermediate temperature. However, G. dominans showed similar growth rates at 12 and 18ºC, and even if showed a marked decrease in growth rates at 25ºC, this was not significant. Ingestion rates were higher at 18ºC for all the strains. The respiration rates of G. dominans were unaffected by temperature, but the respiration rates of both O. marina strains increased with temperature. The specific dynamic action produced by feeding activity ranged from 2 to 20% of the daily carbon ingestion for all organisms investigated. The calculated energetic budget indicated that the responses to temperature were diverse, even within strains of the same species. G. dominans maintained similar growth at all temperatures by balancing anabolism and catabolism functions. In O. marina strains, on the other hand, the decrease in growth rates at the lowest temperature was driven mainly by reduced ingestion rates. However, increased respiration seemed the primary factor affecting the decrease in growth rates at the highest temperature. These results are discussed in the light of previous studies and on its suitability to understand the response of wild organisms to fluctuations in temperature

Bibliographic Details

Main Authors:	Calbet, Albert, Martínez, Rodrigo Andrés, Saiz, Enric, Alcaraz, Miquel
Other Authors:	Ministerio de Ciencia, Innovación y Universidades (España)
Format:	dataset biblioteca
Language:	English
Published:	CSIC - Instituto de Ciencias del Mar (ICM) 2022
Subjects:	Marine protozoa, Growth, Grazing, Respiration, Specific dynamic action, Temperatures, Growth gross efficiency, Assimilation efficiency, Energetic budget, Q10, Ea, Gyrodinium dominans, Oxyrrhis marina,
Online Access:	http://hdl.handle.net/10261/264347 http://dx.doi.org/10.13039/501100002848 http://dx.doi.org/10.13039/501100000780 http://dx.doi.org/10.13039/501100002809 http://dx.doi.org/10.13039/501100011033
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