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David is currently at DFO, Victoria

David Crawford | Postdoctoral Fellow

Research Interests

My research interests are principally concerned with the physiological ecology of microbial plankton. In particular my interests include:

1. Use of controlled cultures to examine the influence of phytoplankton on the dissolved CO2 equilibrium in seawater.

2. Influence of blooms of the coccolithophorid Emiliania huxleyi on PCO2.

3. Dynamics of formation of red-tides; general ecology of red-tides.

4. Respiration studies on marine protists.

Brief Resumé

1979; B.Sc. (Honours), Biology, Portsmouth Polytechnic, UK.

1982; M.Sc. Oceanography, University of Southampton, UK.

1983-1990; Research Assistant, Oceanography, University of Southampton, UK.

1990: Richard Newitt Prize, University of Southampton, UK.

1990; NASA 'Planetary Biology Intern', Woods Hole Oceanographic Institute, USA.

1990-1992; Research Fellow, University of London (Marine Station, Millport, Scotland), UK.

1991; Royal Society 'John Murray Travelling Fellowship', Åbo Academi, Finland.

1992; Ph.D. Oceanography (part-time), University of Southampton, UK.

1992-1994; EEC MAST Research Fellow, University of Southampton, UK.

1995-1997; NSERC 'Canada International Fellow', University of British Columbia, Canada.

Refereed articles

1. CRAWFORD, D.W. (1989). Mesodinium rubrum: the phytoplankter that wasn't. Marine Ecology - Progress Series 58: 161-174.

2. Iriarte, A; G. Daneri; V.M.T. Garcia; D.A. Purdie & D.W. CRAWFORD (1991). Plankton community respiration and its relationship to chlorophyll a concentration in marine coastal waters. Oceanologica Acta 14: 379-388.

3. CRAWFORD, D.W. (1992). An epibiont on the red-water ciliate Mesodinium rubrum. Journal of the Marine Biological Association of the United Kingdom 72: 261-264.

4. CRAWFORD, D.W. (1992). Metabolic cost of motility in planktonic protists: theoretical considerations on size scaling and swimming speed. Microbial Ecology 24: 1-10.

5. CRAWFORD, D.W. & D.A. Purdie (1992). Avoidance of flushing from an estuary, by a planktonic, phototrophic ciliate. Marine Ecology - Progress Series 79: 259-265.

6. Daneri, G.; D.W. CRAWFORD & D.A. Purdie (1992). Algal blooms in coastal waters: a comparison between two adaptable phytoplankton species, Phaeocystis pouchetii and Mesodinium rubrum. In: Science of the Total Environment (supplement 1992): 879-890.

7. Daneri, G.; A. Iriarte; V.M.T. Garcia; D.A. Purdie & D.W. CRAWFORD (1992). Growth irradiance as a factor controlling the dark respiration rates of marine phytoplankton. Journal of the Marine Biological Association of the United Kingdom 72: 723-726.

8. Laybourn-Parry, J.; A.R. Rogerson & D.W. CRAWFORD (1992). Temporal patterns of protozooplankton abundance in the Clyde and Loch Striven. Estuarine and Coastal Shelf Science 35: 533-543.

9. CRAWFORD, D.W.; L.E. Hawkins; S. Hutchinson; E.E. Antai; D.A. Purdie & A.P.M. Lockwood (1993). Red-tides of Mesodinium rubrum: evidence for remotely imposed stress on the oyster Ostrea edulis. In: Toxic Phytoplankton Blooms in the Sea: Proceedings of the 5th International Conference on Toxic Marine Phytoplankton, Newport, Rhode Island, USA, Elsevier, p. 389-394.

10. CRAWFORD, D.W. (1993). Some observations on morphological variation in the red-water ciliate Mesodinium rubrum. Journal of the Marine Biological Association of the United Kingdom 73: 975-978.

11. CRAWFORD, D.W.; A.R. Rogerson & J. Laybourn-Parry (1994). Respiration of the marine amoeba Trichosphaerium sieboldi determined by 14C labelling and Cartesian diver methods. Marine Ecology - Progress Series 112: 135-142.

12. CRAWFORD, D.W. & D.K. Stoecker (1996). Carbon content, dark respiration and mortality of the mixotrophic planktonic ciliate Strombidium capitatum. Marine Biology 126: 415-422.

13. CRAWFORD, D.W. & D.A. Purdie (1997). Increase of PCO2 during blooms of Emiliania huxleyi: Theoretical considerations on the asymmetry between acquisition of HCO3- and respiration of free CO2. Limnology and Oceanography 42: 365-372.

14. CRAWFORD, D.W., D.A. Purdie, A.P.M. Lockwood & P. Weissman (1997). Recurrent red-tides in the Southampton Water estuary caused by the phototrophic ciliate Mesodinium rubrum. Estuarine, Coastal and Shelf Science in press.

15. CRAWFORD, D.W. & T. Lindholm (1997). Some observations on vertical distribution and migration of the phototrophic ciliate Mesodinium rubrum in a stratified brackish lake. Aquatic Microbial Ecology in press.

16. Wyman, M., J.T. Davies, K. Weston, D.W. CRAWFORD & D.A. Purdie (1997). Ribulose-1,5-biphosphate Carboxylase/Oxygenase (RubisCO) gene expression and photosynthetic activity in nutrient enriched mesocosm experiments. PRIME Mesocosm Special Issue, Estuarine, Coastal and Shelf Science in press.

17. Kennedy, H., G. Middleton, D.W. CRAWFORD & D.A. Purdie (1997). A comparison of estimates of plankton production derived from in-vitro 14C uptake and O2 production, and in-vivo changes in total dissolved inorganic and particulate organic carbon. PRIME Mesocosm Special Issue, Estuarine, Coastal and Shelf Science submitted.

18. Head, R.N., D.W. CRAWFORD, J. Egge, D. Lesley, S. Kristiansen, E. Maranon, D. Pond, D.A. Purdie & R.P. Harris (1997). The hydrogaphy and biology of a bloom of the coccolithophorid Emiliania huxleyi in the northern North Sea. Netherlands Journal of Sea Research submitted.

19. CRAWFORD, D.W. & P.J. Harrison. Direct measurement of PCO2 in cultures of marine phytoplankton in artificial seawater: how good is the estimate from pHNBS and single point titration of alkalinity? Marine Ecology Progress Series submitted.

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