Diatomeas planctónicas del litoral de Andalucía (España). Planktonic diatoms from the coast of Andalusia (Spain)

Espanol. Se estudian un total de 206 taxones identificados durante el estudio del ciclo anual realizado en las costas de Andalucia a lo largo del ano 2000. Destacan, entre las diatomeas centricas, la subclase Coscinodiscophycidae con 27 taxones y la subclase Chaetocerotophycidae con 28. Entre las pennadas destaca la clase Bacillariophyceae con 76 species. Los generos que mostraron un mayor numero de taxones fueron Chaetoceros, Thalassiosira y Rhizosolenia en el grupo de diatomeas centricas, mientras que entre las pennadas destacaron los generos Lyrella, Gyrosigma y Pseudonitzschia. Respecto a su distribucion espacial, se han detectado 12 especies exclusivamente atlanticas, mientras que 69 fueron mediterraneas. El resto de taxones presento una distribucion mas amplia tanto mediterranea como atlantica. En cuanto a la abundancia celular hemos considerado 119 taxones en la categoria de raros, 57 de habituales y 29 como taxones mayoritarios. Entre los ultimos destacaron Hemiaulus sinensis y Eucampia cornuta con caracter marcadamente atlantico, y en la zona mediterranea Cerataulina pelagica y Proboscia alata f. inermes. Las especies mas abundantes de todo el litoral andaluz fueron Leptocylindrus minimus, Leptocylindrus danicus, Pseudonitzschia fraudulenta, Skeletonema costatum, Thalassionema nitzschioides, Guinardia striata, Guinardia delicatula y Dactyliosolen phuketensis. English.  In this paper we study 206 taxa found during the annual cycle conducted off the coast of Andalusia during 2000. The most representatives centric diatoms were the subclass Coscinodiscophycidae with 27 taxa and the subclass Chaetocerotophycidae with 28. Among the pennate diatom stand out Bacillariophyceae with 76 species. The Genera that showing the bigger number of taxa were Chaetoceros, Thalassiosira and Rhizosolenia in centric diatoms, whereas in pennate diatoms the Genera Lyrella, Gyrosigma and Pseudonitzschia were dominant. Regarding spatial distribution, 12 species were found exclusively Atlantic, while 69 were Mediterranean. The remaining taxa had a wider distribution both Mediterranean and Atlantic. In terms of cell abundance we considered 119 taxa in the category of rare, 57 taxa in the category of common and 29 as abundant taxa. In the Atlantic area Hemiaulus sinensis and Eucampia cornuta dominated whereas Cerataulina pelagica and Proboscia alata f. inermis characterized the Mediterranean zone. Leptocylindrus minimus, Leptocylindrus danicus, Pseudonitzschia fraudulenta, Skeletonema costatum, Thalassionema nitzschioides, Guinardia striata, Guinardia delicatula, and Dactyliosolen phuketensis were the most representative taxa in the whole Andalusian littoral.