Original scientific paper

https://doi.org/10.2478/v10184-010-0019-0

Diversity and distribution of the dinoflagellates Brachidinium, Asterodinium and Microceratium (Brachidiniales, Dinophyceae) in the open Mediterranean Sea

Fernando Gomez orcid.org/0000-0002-5886-3488 ; Instituto Cavanilles de Biodiversidad y Biología Evolutiva, Universidad de Valencia, PO Box 22085, 46071 Valencia, Spain

Abstract

Brachidiniacean dinoflagellates have been investigated in the open waters of the Mediterranean Sea, along a transect from the south of France to the south of Cyprus (20 June–18 July 2008). Brachidinium and Karenia papilionacea often co-occurred, B. capitatum predominating in the surface waters. The highest abundance of Brachidinium were found in the upper 25min the western Mediterranean with a maximum (24 cells L–1) at a depth of 5 m in the Balearic Sea. Asterodinium (up to 4 cells L–1) was recorded below of deep chlorophyll maxima. The genus Microceratium, only known from the tropical Indo-Pacific region, is reported for the first time in the Mediterranean Sea. Microceratium was found below 100min the eastern Mediterranean Sea, with the highest abundance of 8 cells L–1 at 125 m depth, in the Levantine Basin. This study also illustrates for the first time specimens under the division of Brachidinium and Microceratium. This first occurrence of Microceratium in the Mediterranean Sea should be considered an indicator of climate warming. However, it should not be considered a non-indigenous taxon. Microceratium is the 'tropical morphotype', the adaptation of a local species (a life stage of Karenia – Brachidinium – Asterodinium) to the tropical environmental conditions that prevail in summer in the open Mediterranean Sea.

Keywords

Biodiversity; Brachydinium; Brachydiniales; Dinophyta; introduced species; invasive phytoplankton; Karenia papilionacea; non-indigenous taxa

Hrčak ID:

72086

URI

https://hrcak.srce.hr/72086

Publication date:

3.10.2011.

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