Resumen del producto

In situ Chlorophyll-a [Chl-a] commonly used as an indicator of phytoplankton, functioning as a tracer that enables to evaluate the effects of climate variability on the marine ecosystems production. Data from fifteen oceanographic cruises in the Central region of the Gulf of California from 2005 to 2019, allowed the identification of Chl-a concentration trends for surface layer and at the maximum fluorescence depth recorded at each location with a fluorometer. The Chl-a concentration data were grouped around three geographical sub-regions defined by oceanographic features: 1) the offshore region in the midriff Archipelago [28.60?29.33 °N]; 2) the peninsular coastal margin [26.82?29.54 °N]; and 3) the continental coastal margin [26.52?28.21 °N]. They also were divided into two seasonal periods; cold (November-March) and warm (June-August). The temporal analysis showed spatial heterogeneous trends in Chl-a concentration. The continental sub-region showed the lowest Chl-a concentrations when compared to the other two sub-regions, which commonly showed a similar temporal variation with relatively higher magnitudes at both the surface and maximum fluorescence level. During the cold period, Chl-a data available from 2005 to 2014 showed an increasing trend in the midriff islands and the peninsular margin, whereas an opposite trend was observed in the continental region. During the warm period, Chl-a concentrations (-3), characteristics of oligotrophic conditions, predominated from 2012 to 2019 on the continental margin, which contrasted with the mesotrophic levels of the other two sub-regions. The heterogeneous response of Chl-a among the geographic sub-regions analyzed, suggest a high resilience of the Gulf of California to large-scale climate forcing over the region.

Palabras clave: chlorophyll-a; temporal trends; Gulf of California; central region

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