Maximum cardiac performance of Antarctic fishes that lack haemoglobin and myoglobin: exploring the effect of warming on nature's natural knockouts

• Antarctic notothenioids, some of which lack myoglobin (Mb) and/or haemoglobin (Hb), are considered extremely stenothermal, which raises conservation concerns since Polar regions are warming at unprecedented rates. Without reliable estimates of maximum cardiac output (((Q)over dot)), it is impossible to assess their physiological scope in response to warming seas. Therefore, we compared cardiac performance of two icefish species, Chionodraco rastrospinosus (Hb(-)Mb(+)) and Chaenocephalus aceratus (Hb(-)Mb(-)), with a related notothenioid, Notothenia coriiceps (Hb(+)Mb(+)) using an in situ perfused heart preparation. The maximum (Q)over dot, heart rate (f(H)), maximum cardiac work (WC) and relative ventricular mass of N. coriiceps at 1 degrees C were comparable to temperate-water teleosts, and acute warming to 4 degrees C increased fH and WC, as expected. In contrast, icefish hearts accommodated a higher maximum stroke volume (VS) and maximum. Q at 1 degrees C, but their unusually large hearts had a lower fH and maximum afterload tolerance than N. coriiceps at 1 degrees C. Furthermore, maximum VS, maximum. Q and fH were all significantly higher for the Hb(-)Mb(+) condition compared with the Hb(-)Mb(-) condition, a potential selective advantage when coping with environmental warming. Like N. coriiceps, both icefish species increased H-f at 4 degrees C. Acutely warming C. aceratus increased maximum (Q) over dot, while C. rastrospinosus (like N. coriiceps) held at 4 degrees C for 1 week maintained maximum. Q when tested at 4 degrees C. These experiments involving short-term warming should be followed up with long-term acclimation studies, since the maximum cardiac performance of these three Antarctic species studied seem to be tolerant of temperatures in excess of predictions associated with global warming.

Ämnesord

NATURVETENSKAP  -- Biologi (hsv//swe)

NATURAL SCIENCES  -- Biological Sciences (hsv//eng)

Nyckelord

Cardiac output

cardiac work

heart rate

icefishes

thermal adaptation

warming

rainbow-trout

temperature-acclimation

climate-change

oxygen-uptake

nitric-oxide

hearts

adrenaline

expression

dependence

physiology

Biodiversity & Conservation

Environmental Sciences & Ecology

Physiology

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ref (ämneskategori)

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