Journal of Environmental Biology

A suggested local regions in the Southern Gulf of Mexico using a

diatom database (1979-2002) and oceanic hidrographic features

Author Details

Sergio Licea

(Corresponding author)

Instituto de Ciencias del Mar y Limnolog?a, Universidad Nacional Aut?noma de M?xico,

Apartado 70-305, M?xico. 04510, D.F.

e-mail: licea@cmarl.unam.mx.

Ma. E. Zamudio

Instituto de Ciencias del Mar y Limnolog?a, Universidad Nacional Aut?noma de M?xico, Apartado

70-305, M?xico. 04510, D.F.

J. L. Moreno-Ruiz

Universidad Aut?noma Metropolitana-Xochimilco, Calzada del Hueso 1100, Col. Villa Quietud, C.P.

04960, M?xico, D.F.

R. Luna

Instituto de Ciencias del Mar y Limnolog?a, Universidad Nacional Aut?noma de M?xico, Apartado

70-305, M?xico. 04510, D.F.

Publication Data

Paper received:

24 September 2010

Revised received:

25 June 2010

Accepted:

27 September 2010

Abstract

A diatom data-base of 255 species obtained from 14 oceanographic cruises (14801 entries of 647 sampling sites) together with the analysis of oceanic features were used to establish four local regions in the southern Gulf of Mexico. In addition, common species for each region were designated. This study is based on the application of cluster analysis and the species frequency data. Material for this undertaking consisted of water and net samples obtained between June 1979 and December 2002. Results show that the most frequent species (> 40%) were: Asterionellopsis glacialis, Bacteriastrum delicatulum, B. hyalinum, Chaetoceros affinis, C. coarctatus, C. compresus, C. curvisetus, C. danicus, C. decipiens, C. diversus, C. lorenzianus, C. pelagicus, C. peruvianus, Coscinodiscus radiatus,Cylindrotheca closterium, Guinardia flaccida, Hemiaulus hauckii, H. membranaceus, H. sinensis, Leptocylindrus danicus, Neocalyptrella robusta, Nitzschia bicapitata, Pleurosigma diverse-striatum, Proboscia alata, Pseudo-nitzschia pungens, Pseudosolenia calcar-avis, Rhizosolenia imbricata,R. setigera, Skeletonema costatum, Thalassionema bacillare, T. frauenfeldii, T. nitzschioides and Thalassiosira eccentrica. The species composition for each region and season are discussed. It is concluded that sampling site assemblages are related to oceanographic conditions. A total list of species composition is given, forty-seven species taxa being new records for this area.

Key words

Database, Check list, Diatoms, Southern Gulf of Mexico

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