%0 Journal Article
%T Phytoplankton biomasses and hydrographic conditions during El Ni o 1997-1998 in Bah¨ªa Concepci¨®n, Gulf of California, Mexico
%A David J. L¨®pez-Cort¨¦s
%A Jos¨¦ J. Bustillos-Guzm¨¢n
%A Ismael G¨¢rate-Liz¨¢rraga
%A Francisco E. Hern¨¢ndez-Sandoval
%J Geof¨ªsica internacional
%D 2003
%I Universidad Nacional Aut¨®noma de M¨¦xico
%X The biomass of phytoplankton groups, particularly dinoflagellates as indicated by their signature pigment peridinin, and the physicochemical conditions in Bah¨ªa Concepci¨®n, Gulf of California are analyzed for the years 1997-1999, in order to observe the changes in phytoplankton and hydrographic structure linked to El Ni o 1997-98. Three significant changes occurred in 1998 compared to 1997 and 1999: higher temperatures in the water column, lower nutrient and peridinin concentrations, and a 2 to 3 month delay of the stratification period. These data suggest the influence of Equatorial Surface Water (low nutrients, high temperatures) and a negative effect on the proliferation of dinoflagellate groups during El Ni o 1997-98. Possible causes of the low dinoflagellate biomass are discussed.
%K El Ni o
%K pigment signatures
%K Bah¨ªa Concepci¨®n
%K Gulf of California
%U http://www.geofisica.unam.mx/unid_apoyo/editorial/publicaciones/investigacion/geofisica_internacional/anteriores/2003/03/lopez.pdf