Settling silicoflagellates at the southwestern region of the Gulf of California.
DOI:
https://doi.org/10.37543/oceanides.v25i1.76Keywords:
silicoflagellates, sediment trap, morphological variation, phytoplankton, Alfonso Basin, Bahía de La PazAbstract
Silicoflagellates can be used, after their sedimentation, as a proxy of prevailing ocean surface conditions, however it is essential to identify and document the species inhabiting the study area. This includes a visual and descriptive record of their morphological variability which was accomplished by continuously monitoring the settling silicoflagellates in the Alfonso Basin (Bahia de La Paz) from January 2002 to December 2003.Thirteen taxa distributed in 4 genera: Corbisema (1 species), Dictyocha (10 taxa),
Octactis (1 species) and Distephanus (1 species) were identified. Highest number of taxa (10 and 11
respectively) was observed during the summer and autumn seasons of both years. Octactis pulchra was the only species observed in the 65 samples analyzed. Certain taxa such as Dictyocha calida, D. fibula var robusta, D. epiodon and O. pulchra showed variations in their skeletons which suggest a group response to varying oceanographic conditions, making it imperative to document this variability.
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