Phased cell division, specific division rates and other biological observations of Dinophysis populations in sub-surface layers off the south coast of Ireland

Farrell, H; Velo-Suarez, L; Reguera, B; Raine, R

Phased cell division, specific division rates and other biological observations of Dinophysis populations in sub-surface layers off the south coast of Ireland

Farrell, H Velo-Suarez, L Reguera, B Raine, R

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Publication Type:: Journal Article
Citation:: Deep-Sea Research Part II: Topical Studies in Oceanography, 2014, 101 pp. 249 - 254
Issue Date:: 2014-03-01

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Field	Value	Language
dc.contributor.author	Farrell, H	en_US
dc.contributor.author	Velo-Suarez, L	en_US
dc.contributor.author	Reguera, B	en_US
dc.contributor.author	Raine, R	en_US
dc.date.issued	2014-03-01	en_US
dc.identifier.citation	Deep-Sea Research Part II: Topical Studies in Oceanography, 2014, 101 pp. 249 - 254	en_US
dc.identifier.issn	0967-0645	en_US
dc.identifier.uri	http://hdl.handle.net/10453/117790
dc.description.abstract	The proportions of viable cells of Dinophysis spp. that were paired (dividing) and recently divided during a cell cycle were measured on populations of D. acuta and D. acuminata observed off the south coast of Ireland in July 2007 and July 2009. Both species exhibited phased cell division in 2009 with maximum frequency of division (fmax) 2h after sunrise. Different patterns of division (timing of fmax) were shown by D. acuta in 2007, when the population aggregated in a thin layer was transported by a coastal jet flow. High resolution (decimetre-scale) profiles within the thin layer showed large differences in the vertical distribution of biological properties (feeding status, mortality). Values of the specific growth rate μ were compared to estimates derived in similar fashion from observations on Dinophysis populations elsewhere. Different patterns exhibited by the same species in different regions may be attributed to adaptations to latitudinal differences (length of photoperiod). The question of whether phased cell division always occurs in Dinophysis populations, and the incorporation of the potential specific division rate into models of Dinophysis growth are discussed. Comprehensive field data sets demonstrate the impact of the results on the coherence of Dinophysis populations during their transport along the Irish coast in jet-like flows towards sites of intensive shellfish culture. © 2013 Elsevier Ltd.	en_US
dc.relation.ispartof	Deep-Sea Research Part II: Topical Studies in Oceanography	en_US
dc.relation.isbasedon	10.1016/j.dsr2.2013.05.031	en_US
dc.subject.classification	Oceanography	en_US
dc.title	Phased cell division, specific division rates and other biological observations of Dinophysis populations in sub-surface layers off the south coast of Ireland	en_US
dc.type	Journal Article
utslib.citation.volume	101	en_US
utslib.for	0602 Ecology	en_US
utslib.for	0402 Geochemistry	en_US
utslib.for	0405 Oceanography	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
utslib.copyright.status	closed_access
pubs.publication-status	Published	en_US
pubs.volume	101	en_US

Abstract:

The proportions of viable cells of Dinophysis spp. that were paired (dividing) and recently divided during a cell cycle were measured on populations of D. acuta and D. acuminata observed off the south coast of Ireland in July 2007 and July 2009. Both species exhibited phased cell division in 2009 with maximum frequency of division (fmax) 2h after sunrise. Different patterns of division (timing of fmax) were shown by D. acuta in 2007, when the population aggregated in a thin layer was transported by a coastal jet flow. High resolution (decimetre-scale) profiles within the thin layer showed large differences in the vertical distribution of biological properties (feeding status, mortality). Values of the specific growth rate μ were compared to estimates derived in similar fashion from observations on Dinophysis populations elsewhere. Different patterns exhibited by the same species in different regions may be attributed to adaptations to latitudinal differences (length of photoperiod). The question of whether phased cell division always occurs in Dinophysis populations, and the incorporation of the potential specific division rate into models of Dinophysis growth are discussed. Comprehensive field data sets demonstrate the impact of the results on the coherence of Dinophysis populations during their transport along the Irish coast in jet-like flows towards sites of intensive shellfish culture. © 2013 Elsevier Ltd.

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http://hdl.handle.net/10453/117790