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

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ID: 52838
2019
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Abstract
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 warm-acclimation 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 μgO*gww*h) compared to H. forskali (1.5-6.6 μgO*gww*h). 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.
Reference Key
kuhnhold2019acclimationjournal Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Kühnhold, Holger;Novais, Sara C;Alves, Luis M F;Kamyab, Elham;Lemos, Marco F L;Slater, Matthew J;Kunzmann, Andreas;
Journal Journal of thermal biology
Year 2019
DOI
S0306-4565(19)30211-6
URL
Keywords
temperature stress energy metabolism eurytherms holothuria forskali holothuria scabra stenotherms

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