Intra-annual upwelling patterns and its linkage with primary production in the euphotic zone (24.5°N) of Southern Baja California coast

Cervantes‐Duarte, Rafael; Prego, Ricardo; Gaxiola‐Castro, Gilberto; López-López, Silverio; Aguirre-Bahena, Fernando; Murillo-Murillo, Ibán

doi:10.1016/j.ecss.2015.02.008

Cited by 7 publications

(2 citation statements)

References 15 publications

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“…For instance, Joint et al (Joint et al, 2001) reported a depth-integrated primary production maximum of 1053 mg C m 22 day 21 in the Iberian upwelling zone. Cervantes-Duarte et al (Cervantes-Duarte et al, 2015) report rates ranging from 930 to 1730 mg C m 22 day 21 , with an annual average of 1210 mg C m 22 day 21 , in the Southern Baja California coast upwelling area. In a coastal upwelling area of the East China Sea, integrated primary production ranged from 1470 to 4710 mg C m 22 day 21 , with the highest rates found at river outflow-influenced sites (Chen et al, 2004).…”

Section: Primary Production Comparison To Other Pacific Regionsmentioning

confidence: 99%

Phytoplankton production and taxon-specific growth rates in the Costa Rica Dome

et al. 2015

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During summer 2010, we investigated phytoplankton production and growth rates at 19 stations in the eastern tropical Pacific, where winds and strong opposing currents generate the Costa Rica Dome (CRD), an open-ocean upwelling feature. Primary production ( 14 C-incorporation) and group-specific growth and net growth rates (two-treatment seawater dilution method) were estimated from samples incubated in situ at eight depths. Our cruise coincided with a mild El Niño event, and only weak upwelling was observed in the CRD. Nevertheless, the highest phytoplankton abundances were found near the dome center. However, mixed-layer growth rates were lowest in the dome center ( 0.5 -0.9 day 21 ), but higher on the edge of the dome ( 0.9 -1.0 day 21 ) and in adjacent coastal waters (0.9 -1.3 day 21 ). We found good agreement between independent methods to estimate growth rates. Mixed-layer growth rates of Prochlorococcus and Synechococcus were largely balanced by mortality, whereas eukaryotic phytoplankton showed positive net growth ( 0.5 -0.6 day 21 ), that is, growth available to support larger (mesozooplankton) consumer biomass. These are the first group-specific phytoplankton rate estimates in this region, and they demonstrate that integrated primary production is high, exceeding 1 g C m 22 day 21 on average, even during a period of reduced upwelling.

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Section: Primary Production Comparison To Other Pacific Regionsmentioning

confidence: 99%

Phytoplankton production and taxon-specific growth rates in the Costa Rica Dome

et al. 2015

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“…However, the Magdalena-Almejas area is one of the most productive and biologically diverse lagoon systems on the Pacific coast of Mexico (Lluch-Belda et al 2003), and it is therefore an area with a high percentage of fishery production in Baja California Sur, a state occupying fourth place in fishery production nationwide (CONAPESCA 2013). The seasonal variation of hydrographic conditions and its relation to primary production in the region have been studied by Kahru et al (2009) and Cervantes-Duarte et al (2015); these authors reported a latitudinal (south-north) productivity increase, with maximum values during intense upwelling periods. In addition, climate events such as El Niño affect phytoplankton communities along the coasts of Baja California, reducing diversity and increasing the contribution of subtropical groups such as coccolithophores (Hernández-Becerril et al 2007).…”

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confidence: 99%

Temporal variability of phytoplankton biomass and primary production off Magdalena Bay, Baja California Sur, Mexico

et al. 2018

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Sixteen monthly cruises were carried out at a station 6.5 km to the NW of the mouth of Magdalena Bay (Mexico) to study the temporal variability of phytoplankton biomass and primary production rates, and the response of phytoplankton to the prevailing hydrographic characteristics. During each cruise, temperature and salinity were measured in the water column, and discrete samples were collected to measure inorganic nutrient concentrations (nitrate, phosphate, and silicate) and chlorophyll a content (as a proxy for phytoplankton biomass); in addition, in situ incubations were performed to estimate primary production (PP) rates using the 14 C technique. During spring and early summer (March-July), the water column at the study site was cold (14.4 ºC at 80 m depth and 17.7 ºC at the surface) and well mixed, with high nutrient concentrations (nitrate = 6.39 μM, phosphate = 0.91 μM, and silicate = 11.87 μM) at the surface, typical of intense upwelling systems. On the contrary, from August to February the water column was stratified (23.5 ± 3.2 ºC above the thermocline and 17.0 ± 1.7 ºC at 80 m depth) and had low nutrient concentrations (nitrate = 3.90 μM, phosphate = 0.47 μM, and silicate = 10.30 μM) at the surface. Phytoplankton abundance, chlorophyll a concentration, and PP rates in the euphotic zone were higher during the upwelling season, with maximum cell density of 1.7 × 10 6 cells•L-1 (nanoplankton fraction), integrated chlorophyll a content of 231 mg•m-2 , and integrated PP rates of 553 mg C•m-2 •h-1). Abundance of cells <20 μm, as determined by flow cytometry, revealed the importance of the nanoplankton and picoplankton fractions in this region. This study showed the seasonal variability of phytoplankton communities (biomass and productivity) in waters off Magdalena Bay and the coupling of phytoplankton to environmental variability. Seasonal variability was similar to that observed for other typical coastal upwelling regions, that is, higher phytoplankton abundances and PP rates in spring and summer and lower values in autumn and winter.

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Nutrient flux estimates in a tidal basin: A case study of Magdalena lagoon, Mexican Pacific coast

Zaytsev

Cervantes‐Duarte

2018

Estuarine, Coastal and Shelf Science

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Intra-annual upwelling patterns and its linkage with primary production in the euphotic zone (24.5°N) of Southern Baja California coast

Cited by 7 publications

References 15 publications

Phytoplankton production and taxon-specific growth rates in the Costa Rica Dome

Phytoplankton production and taxon-specific growth rates in the Costa Rica Dome

Temporal variability of phytoplankton biomass and primary production off Magdalena Bay, Baja California Sur, Mexico

Nutrient flux estimates in a tidal basin: A case study of Magdalena lagoon, Mexican Pacific coast

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