Journal
JOURNAL OF COMPARATIVE PHYSIOLOGY B-BIOCHEMICAL SYSTEMS AND ENVIRONMENTAL PHYSIOLOGY
Volume 188, Issue 2, Pages 271-282Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00360-017-1124-3
Keywords
Temperature; Metabolism; Performance curves; Embryos; Polar fish; Gymnodraco acuticeps
Categories
Funding
- National Science Foundation (NSF) [ANT-1142122]
- Directorate For Geosciences
- Office of Polar Programs (OPP) [1142122] Funding Source: National Science Foundation
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For ectotherms, temperature modifies the rate of physiological function across a temperature tolerance window depending on thermal history, ontogeny, and evolutionary history. Some adult Antarctic fishes, with comparatively narrow thermal windows, exhibit thermal plasticity in standard metabolic rate; however, little is known about the shape or breadth of thermal performance curves of earlier life stages of Antarctic fishes. We tested the effects of acute warming (- 1 to 8 A degrees C) and temperature acclimation (2 weeks at - 1, 2, 4 A degrees C) on survival and standard metabolic rate in early embryos of the dragonfish Gymnodraco acuticeps from McMurdo Sound, Ross Island, Antarctica. Contrary to predictions, embryos acclimated to warmer temperatures did not experience greater mortality and nearly all embryos survived acute warming to 8 A degrees C. Metabolic performance curve height and shape were both significantly altered after 2 weeks of development at - 1 A degrees C, with further increase in curve height, but not alteration of shape, with warm temperature acclimation. Overall metabolic rate temperature sensitivity (Q (10)) from - 1 to 8 A degrees C varied from 2.6 to 3.6, with the greatest thermal sensitivity exhibited by embryos at earlier developmental stages. Interclutch variation in metabolic rates, mass, and development of simultaneously collected embryos was also documented. Taken together, metabolic performance curves provide insight into the costs of early development under warming temperatures, with the potential for thermal sensitivity to be modified by dragonfish phenology and magnitude of seasonal changes in temperature.
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