Metabolic responses of Nephrops norvegicus to progressive hypoxia |
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| Institution: | 1. Institute of Biodiversity, Animal Health and Comparative Medicine, University of Glasgow, Glasgow G12 8QQ, Scotland, United Kingdom;2. St Abbs Marine Station, The Harbour, St Abbs, Berwickshire TD14 5PW, Scotland, United Kingdom;3. School of Natural Sciences, University of Stirling, Stirling FK9 4LA, Scotland, United Kingdom;4. Department of Biosciences, College of Science, Swansea University, Swansea SA2 8PP, Wales, United Kingdom;1. Ecopath International Initiative Research Association, Mestre Nicolau 8, Bellaterra, Barcelona 08193, Spain;2. Fisheries Centre, University of British Columbia, 2202 Main Mall, Vancouver, BC, Canada V6 T 1Z4;3. Istituto nazionale di Oceanografia e di Geofisica Sperimentale, Trieste, Italy;4. Alaska Fisheries Science Center, 7600 Sand Point Way N.E., Building 4, Seattle, WA 98115, USA;5. Commonwealth Scientific and Industrial Research Organisation, Ecosciences Precinct, 41 Boggo Rd, Dutton Park, Brisbane, QLD 4102, Australia;6. Université Européenne de Bretagne, Agrocampus Ouest, UMR985 Ecologie et santé des écosystèmes, Rennes Cedex, France;7. NOAA Fisheries, Northeast Fisheries Science Center, 166 Water Street, Woods Hole, MA 02536, USA;8. University of Washington, Joint Institute for the Study of the Atmosphere and Oceans (JISAO), Seattle, WA, USA;9. Centre for Fisheries, Environment and Aquaculture Science, Pakefield Road, Lowestoft, Suffolk NR33 0HT, UK;1. Department of Ecology and Evolutionary Biology, Princeton University, Princeton, NJ, USA;2. School of Environmental Sciences, University of East Anglia, Norwich, UK;3. School of Biology, University of Leeds, Leeds, UK;4. Department of Animal and Plant Sciences, University of Sheffield, Sheffield, UK;1. Department of Mathematics, Faculty of Mathematical Sciences, Alzahra University, Tehran, Iran;2. National Elites Foundation, Tehran, Iran;3. Department of Computer Science, Faculty of Mathematical Sciences and Computer, Kharazmi University, Tehran, Iran |
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| Abstract: | This work studied some of the metabolic responses of Nephrops norvegicus to a progressive reduction in water oxygen tension (PwO2) at 12 °C. Experiments were designed to simulate water quality conditions that may occur during the trade of live crustaceans. Oxygen consumption rates and ammonia efflux rates were found to be constant over a wide range of PwO2 values (20.4–5.9 kPa). A similar result was found for the difference between post-branchial and pre-branchial oxygen concentrations (20.4–2.6 kPa), obtained from a separate experiment. Anaerobic pathways, however, were activated after PwO2 reached 6.3 kPa, as blood lactate and glucose concentrations increased from 1.24 ± 0.08 and 1.17 ± 0.19 (T0 values) to 10.55 ± 8.99 and 3.63 ± 0.89 mg · 100 mL?1 respectively. N. norvegicus was able to maintain blood pH levels at relatively constant values despite a drop in water pH levels and the accumulation of lactate observed at low PwO2. Heart rates also remained stable during PwO2 reductions, but scaphognathite beat rate increased considerably, probably as an attempt to maintain steady weight-specific oxygen consumption rates. N. norvegicus appeared to be well adapted to cope with progressive hypoxia as may occur during holding and transportation procedures. |
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