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Haemolymph oxygen transport and acid-base status in Glyptonotus antarcticus Eights

Whiteley, N. M.; Taylor, E. W.; Clarke, A.; Haj, A. J. El. 1997 Haemolymph oxygen transport and acid-base status in Glyptonotus antarcticus Eights. Polar Biology, 18 (1). 10-15. 10.1007/s003000050153

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Abstract/Summary

Haemolymph samples were withdrawn from routinely active male intermoult Glyptonotus held at 0 ± 0.5°C, and analysed for blood-gas and acid-base variables. In both the arterialised (a) and venous (v) haemolymph, over 50% of the oxygen was transported as dissolved oxygen at PaO2 and PvO2 levels of 12.0 ± 1.15 and 7.70 ± 1.89 kPa, respectively. The maximum oxygen-carrying capacity of the haemocyanin (CmaxHcO2) was relatively low at 0.19 ± 0.05 mmol l−1, accompanied by relatively low protein and [Cu2+] levels indicating low circulating haemocyanin concentrations. Arterialised haemolymph had a mean pH of 7.88 ± 0.02(6) at a PCO2 of 0.12 ± 0.01(6) kPa and a bicarbonate level of 12.95 ± 0.80(6) mequiv l−1 with small differences in PCO2 and pH between arterial and venous haemolymph. The non-bicarbonate buffering capacity of Glyptonotus haemolymph was low at −2.0 mequiv l−1 HCO3− pH unit−1. Haemolymph [l-lactate] and [d-glucose] levels were similar at < 1 mmol l−1 in animals held in the laboratory and those sampled in Antarctica. The blood-gas and acid-base status of Glyptonotus haemolymph may be a reflection of the low and stable temperatures experienced by this Antarctic crustacean.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1007/s003000050153
Programmes: BAS Programmes > Pre 2000 programme
ISSN: 0722-4060
Date made live: 10 Oct 2016 13:32 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/514779

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