Oxygen uptake in the Antarctic teleost Pagothenia borchgrevinki. Limitations imposed by X-cell gill disease |
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Authors: | William Davison Craig E Franklin Peter W Carey |
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Institution: | (1) Department of Zoology, University of Canterbury, Christchurch, New Zealand |
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Abstract: | Fish in a population of Pagothenia borchgrevinki in McMurdo Sound, Antarctica, are affected by a gill disease (X-cell disease) which causes tissue hyperplasia that results
in a decreased gill surface area and an increased water/blood diffusion distance. P. borchgrevinki acquires 95% of its oxygen via the gills, but damage to the gills by X-cell disease did not affect this function. There was
no compensatory shift to cutaneous respiration. X-cell disease reduced the ability for oxygen uptake at low ambient PO
2 and the decreased uptake was related to the extent of the disease. O
2 max was greatly reduced in X-cell affected fish and substantially reduced their aerobic potential. This effect may impair
the ability of diseased fish to catch prey and avoid predators. |
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Keywords: | antarctic respiration X-cell gills VO2 max Pagothenia aerobic scope |
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