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levels requires more field data and a complement of modelling approaches. Models of planktonic trophic webs explicitly considering prey quality effects (i.e. Mitra 2006) represent an interesting avenue in that

regard. In summary, suggested that strong

results presented here mixing events in shallow

ecosystems may impact on the assemblage structure and have delayed positive effects on phytoplankton growth, biomass levels and stratification on short time-scales (days). The extent to which such energy and matter is transferred up the food webs remains an open question that deserves further attention.

Calliari, D. & Antezana, T. 2001. Dial feeding rhythm of copepod size-fractions from Coliumo Bay, central Chile. Scientia Marina 65: 269-274. Castro, L., Bernal, P. A. & González, H. 1991. Vertical distribution of copepods and the utilization of the chlorophyll a-rich layer within Concepción Bay, Chile. Estuarine Coastal and Shelf Science 32: 243-256. Clarke, K. R. & Warwick, R. M. 1994. Change in Marine Communities: an Approach to Statistical Analysis and Interpretation.

Plymouth (44pp).




Aknowledgements This research was

funded by



Investigación, 97.112.041-6),

Universidad and a

de Concepción (P.I.



Akademischer Austauschdienst) scholarship to D. Calliari. T. Antezana, L. Mendez and J. Marileo (UdeC) provided valuable support during sampling. A. Pacheco helped with microplankton identification. T. Antezana, R. Quiñones (UdeC), L. Rodriguez and F. García (UdelaR) commented on earlier versions of this manuscript. Criticism by anonymous reviewers contributed to improve this paper and is sincerelly acknowledged.

References Arancibia, H. 1988. Cluster analysis. The use of a simple statistical method in the identification of groups. ICES Council Meeting (Collected Papers). ICES, Copenhagen, Denmark (18pp). Augsburger, A. 1981. Variación estacional Invierno- Primavera de la biomasa fitoplanctónica y la alcalinidad en Bahía Coliumo (36º32’S, 72º57’W). Degree Thesis . Universidad de Concepción, Chile, 35 p. Björnberg, T. S. K. 1981. Copépoda. In: Boltovskoy, D. (ed) Atlas del zooplancton del Atlántico Sudoccidental: 587-679. Publicación especial del INIDEP, Mar del Plata, Argentina. Bjørnsen, P. K. & Nielsen, T. G. 1991. Decimetre scale heterogeneity in the plankton during a pycnocline bloom of Gyrodinium aureolum. Marine Ecology Progress Series 73: 263- 267. Calliari, D. 1999. Modulación de la tasa de ingestión del zooplancton herbívoro por la microturbulencia. PhD Thesis. Universidad de Concepción. 154 pp. Calliari, D. & Alfaro, E. 1997. Un modelo de estimación de viento para Bahía Coliumo, Chile Central. Gayana Oceanologica (Chile) 5(2): 87-93.

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user manual/tutorial. Plymouth.



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Phytoplankton patches at fronts: a model of formation and response to wind events. Journal of Marine Research 55: 1-29. González, H. 1982. Contribución al conocimiento del fitoplancton de Bahía Coliumo (36º32S, 72º57’W), Concepción, Chile, en el período Otoño-Invierno de 1981. Degree Thesis. Universidad de Concepción, 119 pp. Guiry, M. D. & Guiry, G. M. 2006. AlgaeBase version 4.2. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 30 October 2006. Hasle, G. R. 1950. Phototactic vertical migration in marine dinoflagellates. Oikos 2: 162-175.

Pan-American Journal of Aquatic Sciences (2007) 2 (1): 13-22

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