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Acclimation capability inferred by metabolic performance in two sea cucumber species from different latitudes

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Summary:The notion that thermal specialists from tropical regions live closer to their temperature limits than temperate eurytherms, seems too generalized. Species specific differences in physiological and biochemical stress reactions are linked to key components of organism fitness, like metabolic capacity, which indicates that acclimation potential across latitudes might be highly diverse rather than simplistic. In this study the exposure of a tropical (Holothuria scabra) and a temperate (Holothuria forskali) sea cucumber species to identical cold- and warmacclimation stress was compared using the key metabolic parameters, respiration rate, enzyme activity (ETS, LDH, IDH), and energy reserve fractions (lipid, carbohydrate and protein). Results show much broader respiratory adjustments, as response to temperature change, in H. scabra (2–30 μgO2*gww−1 *h−1) compared to H. forskali (1.5–6.6 μgO2*gww−1 *h−1). Moreover, the tropical species showed clearly pronounced up and down regulation of metabolic enzymes and shifts in energy reserves, due to thermal acclimation, while the same metabolic indicators remained consistent in the temperate species. In summary, these findings indicate enhanced metabolic plasticity in H. scabra at the cost of elevated energy expenditures, which seems to favor the tropical stenotherm in terms of thermal acclimation capacity. The comparison of such holistic metabolic analyses between conspecifics and congeners, may help to predict the heterogeneous effects of global temperature changes across latitudinal gradients.
Main Authors:Kühnhold, Holger
Other Authors:Novais, Sara C.; Alves, Luís M. F.; Kamyab, Elham; Lemos, Marco F. L.; Slater, Matthew J.; Kunzmann, Andreas
Subject:Eurytherms Stenotherms Holothuria scabra Holothuria forskali Energy metabolism Temperature stress
Year:2019
Country:Portugal
Document type:article
Access type:restricted access
Associated institution:Universidade de Leiria e Oeste
Language:English
Origin:IC-online

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