Diatomeas planctónicas del litoral de Andalucía (España)

Laburpena

Planktonic diatoms from the coast of Andalusia (Spain). 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.