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Physiological plasticity of cardiorespiratory function in a eurythermal marine teleost, the longjaw mudsucker, Gillichthys mirabilis.

Publication ,  Journal Article
Jayasundara, N; Somero, GN
Published in: The Journal of experimental biology
June 2013

An insufficient supply of oxygen under thermal stress is thought to define thermal optima and tolerance limits in teleost fish. When under thermal stress, cardiac function plays a crucial role in sustaining adequate oxygen supply for respiring tissues. Thus, adaptive phenotypic plasticity of cardiac performance may be critical for modifying thermal limits during temperature acclimation. Here we investigated effects of temperature acclimation on oxygen consumption, cardiac function and blood oxygen carrying capacity of a eurythermal goby fish, Gillichthys mirabilis, acclimated to 9, 19 and 26°C for 4 weeks. Acclimation did not alter resting metabolic rates or heart rates; no compensation of rates was observed at acclimation temperatures. However, under an acute heat ramp, warm-acclimated fish exhibited greater heat tolerance (CTmax=33.3, 37.1 and 38.9°C for 9°C-, 19°C- and 26°C-acclimated fish, respectively) and higher cardiac arrhythmia temperatures compared with 9°C-acclimated fish. Heart rates measured under an acute heat stress every week during 28 days of acclimation suggested that both maximum heart rates and temperature at onset of maximum heart rates changed over time with acclimation. Hemoglobin levels increased with acclimation temperature, from 35 g l(-1) in 9°C-acclimated fish to 60-80 g l(-1) in 19°C- and 26°C-acclimated fish. Oxygen consumption rates during recovery from acute heat stress showed post-stress elevation in 26°C-acclimated fish. These data, coupled with elevated resting metabolic rates and heart rates at warm temperatures, suggest a high energetic cost associated with warm acclimation in G. mirabilis. Furthermore, acclimatory capacity appears to be optimized at 19°C, a temperature shown by behavioral studies to be close to the species' preferred temperature.

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Published In

The Journal of experimental biology

DOI

EISSN

1477-9145

ISSN

0022-0949

Publication Date

June 2013

Volume

216

Issue

Pt 11

Start / End Page

2111 / 2121

Related Subject Headings

  • Stress, Physiological
  • Respiratory Physiological Phenomena
  • Physiology
  • Perciformes
  • Oxygen Consumption
  • Male
  • Hot Temperature
  • Heart Rate
  • Heart
  • Basal Metabolism
 

Citation

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Jayasundara, N., & Somero, G. N. (2013). Physiological plasticity of cardiorespiratory function in a eurythermal marine teleost, the longjaw mudsucker, Gillichthys mirabilis. The Journal of Experimental Biology, 216(Pt 11), 2111–2121. https://doi.org/10.1242/jeb.083873
Jayasundara, Nishad, and George N. Somero. “Physiological plasticity of cardiorespiratory function in a eurythermal marine teleost, the longjaw mudsucker, Gillichthys mirabilis.The Journal of Experimental Biology 216, no. Pt 11 (June 2013): 2111–21. https://doi.org/10.1242/jeb.083873.
Jayasundara N, Somero GN. Physiological plasticity of cardiorespiratory function in a eurythermal marine teleost, the longjaw mudsucker, Gillichthys mirabilis. The Journal of experimental biology. 2013 Jun;216(Pt 11):2111–21.
Jayasundara, Nishad, and George N. Somero. “Physiological plasticity of cardiorespiratory function in a eurythermal marine teleost, the longjaw mudsucker, Gillichthys mirabilis.The Journal of Experimental Biology, vol. 216, no. Pt 11, June 2013, pp. 2111–21. Epmc, doi:10.1242/jeb.083873.
Jayasundara N, Somero GN. Physiological plasticity of cardiorespiratory function in a eurythermal marine teleost, the longjaw mudsucker, Gillichthys mirabilis. The Journal of experimental biology. 2013 Jun;216(Pt 11):2111–2121.
Journal cover image

Published In

The Journal of experimental biology

DOI

EISSN

1477-9145

ISSN

0022-0949

Publication Date

June 2013

Volume

216

Issue

Pt 11

Start / End Page

2111 / 2121

Related Subject Headings

  • Stress, Physiological
  • Respiratory Physiological Phenomena
  • Physiology
  • Perciformes
  • Oxygen Consumption
  • Male
  • Hot Temperature
  • Heart Rate
  • Heart
  • Basal Metabolism