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Marine Ecology Progress Series

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MEPS 385:87-96 (2009)  -  DOI: https://doi.org/10.3354/meps08014

Vertical distribution of division rates in coastal dinoflagellate Dinophysis spp. populations: implications for modelling

L. Velo-Suárez1,*, B. Reguera1, E. Garcés2, T. Wyatt3

1Instituto Español de Oceanografía, Centro Oceanográfico de Vigo, Aptdo. 1552, 36200 Vigo, Spain
2Institut de Ciències del Mar (CSIC), Passeig Marítim de la Barceloneta 37-49, 08003 Barcelona, Spain
3Instituto de Investigaciones Marinas (CSIC), Eduardo Cabello 6, Bouzas, 36208 Vigo, Spain

ABSTRACT: This study explores vertical heterogeneities of in situ division rates (μ) of 3 species of Dinophysis and discusses its implications in modelling the population dynamics of these species. Based on a post-mitotic index approach, estimates of μ from vertical net-haul (integrated) samples (μint) were compared with those from a single depth (oceanographic bottle samples) (μz) at the cell maximum during 2 daily cell cycle studies in the Galician Rías Baixas (NW Spain). Additionally, vertical profiles of μz were obtained during a field survey in Ría de Vigo. A 2-fold difference was observed between estimates of μz from the cell maxima and μint from integrated samples under stratified conditions. Differences were much larger when the minimum estimates of μ values from different depths (μmin) were compared within single vertical profiles. An exponential growth model was applied to simulate the dynamics of a D. acuminata population during a daily cycle in June 1994. Results show that actively dividing cells of a target species may be restricted to narrow layers of the water column. Estimates of μ at different relevant depths during cell cycle studies may be key to determining whether if increased numbers of a target species are due to in situ growth or to the balance of imports and exports.


KEY WORDS: Dinophysis spp. · Cell cycle · In situ division rate · Mitotic index · Cell maximum · Modelling approach


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Cite this article as: Velo-Suárez L, Reguera B, Garcés E, Wyatt T (2009) Vertical distribution of division rates in coastal dinoflagellate Dinophysis spp. populations: implications for modelling. Mar Ecol Prog Ser 385:87-96. https://doi.org/10.3354/meps08014

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