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Factors controlling the abundance and size distribution of the phototrophic ciliate Myrionecta rubra in open waters of the North Atlantic.

Montagnes, D.J.S. and Allen, J. and Brown, L. and Bulit, C. and Diaz-Avalos, C. and Fielding, S. and Heath, Michael and Holliday, N.P. and Rasmussen, J. and Sanders, R. and Waniek, J.J. and Wilson, D. (2008) Factors controlling the abundance and size distribution of the phototrophic ciliate Myrionecta rubra in open waters of the North Atlantic. Journal of Eukaryotic Microbiology, 55 (5). pp. 457-65. ISSN 1066-5234

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Abstract

Myrionecta rubra, a ubiquitous planktonic ciliate, has received much attention due to its wide distribution, occurrence as a red tide organism, and unusual cryptophyte endosymbiont. Although well studied in coastal waters, M. rubra is poorly examined in the open ocean. In the Irminger Basin, North Atlantic, the abundance of M. rubra was 0-5 cells/ml, which is low compared with that found in coastal areas. Distinct patchiness (100 km) was revealed by geostatistical analysis. Multiple regression indicated there was little relationship between M. rubra abundance and a number of environmental factors, with the exception of temperature and phytoplankton biomass, which influenced abundance in the spring. We also improve on studies that indicate distinct size classes of M. rubra; we statistically recognise four significantly distinct width classes (5-16, 12-23, 18-27, 21-33 microm), which decrease in abundance with increasing size. A multinomial logistic regression revealed the main variable correlated with this size distribution was ambient nitrate concentration. Finally, we propose a hypothesis for the distribution of sizes, involving nutrients, feeding, and dividing of the endosymbiont.

Item type: Article
ID code: 29082
Keywords: Cell size, protist distribution , plankton, microzooplankton, Mesodinium rubrum, Mathematics, Microbiology
Subjects: Science > Mathematics
Department: Faculty of Science > Mathematics and Statistics
Related URLs:
    Depositing user: Pure Administrator
    Date Deposited: 07 Mar 2011 23:25
    Last modified: 05 Sep 2014 07:31
    URI: http://strathprints.strath.ac.uk/id/eprint/29082

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