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Revista de biología marina y oceanografía

On-line version ISSN 0718-1957

Abstract

MACIEL-BALTAZAR, Ebodio  and  HERNANDEZ-BECERRIL, David U. Species of athecate dinoflagellates (Dinophyta) from coasts of Chiapas, southern Mexican Pacific. Rev. biol. mar. oceanogr. [online]. 2013, vol.48, n.2, pp.245-259. ISSN 0718-1957.  http://dx.doi.org/10.4067/S0718-19572013000200005.

Athecate dinoflagellates have been poorly studied in the plankton of Mexican marine waters, mainly because of their fragility, as they may become deformed using nets and strong fixatives. However, their biodiversity and ecological role might be important in the planktonic realm. As part of routine phytoplankton monitoring in the Chiapas coasts, Mexico, in the southern Mexican Pacific, samples were obtained during 2009 by net (20 µm mesh) in vertical hauls (up to 15 m), fixed with Lugol's solution and studied by light microscope (bright field and phase contrast). Athecate dinoflagellates species were identified using morphological characters such as shape and size, nucleus position, chloroplasts number and position, and particular characters (`arms', `carina', etc.). Twenty-seven species were documented to be present in the study area, with 3 species considered to be new records for the Mexican Pacific Ocean: Cochlodinium pulchellum, Karenia bicuneiformis (= K. bidigitata) and K. papilionacea. Few species studied here have historically been reported as `bloom-forming' species in other parts of the Mexican Pacific. It is clear that more studies should be systematically done to assess the present biodiversity of these dinoflagellates groups in Mexican waters.

Keywords : Dinoflagellates; phytoplankton; morphology; new records; Mexican Pacific.

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