Variability and tidal exchange of ecological properties in a coastal lagoon

Lara-Lara, José Rubén; Alvarez-Borrego, S.; Small, Lawrence F.

doi:10.1016/s0302-3524(80)80014-4

Cited by 56 publications

(81 citation statements)

References 23 publications

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“…Moderate variability of the low C/N ratios and a slight decrease in it during spring tides suggest that bacter~a might enrich the nitrogen content of the particles, since their abundance increases at spring tides. Other studies near our study area have revealed wide variations of C/N ratios in salt marshes (Lara-Lara et al 1980). These authors reported C/N ratios of 3 to 81 associating the lowest ratlos to phytoplankton and bacteria.…”

Section: Discussionsupporting

confidence: 51%

Effect of tidal dynamics on a planktonic community in a coastal lagoon of Baja California, Mexico

Morales-Zamorano¹,

Cajal-Medrano²,

Orellana-Cepeda³

et al. 1991

Mar. Ecol. Prog. Ser.

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Effect of tidal dynamics on a planktonic community in a coastal lagoon of Baja California, MexicoLuis Alberto ~o r a l e s -~a m o r a n o ' , Ramon Cajal-Medranol, Elizabeth ~r e l l a n a -c e p e d a l , Luis C. ~imenez-perez2 ABSTRACT Flfty-two water samples were collected from the surface at the entrance of a coastal lagoon for evaluation of microheterotrophic processes. The study was carried out during a penod of neap and spring tides over 14 consecutive days. Bacteria, microphytoplankton and zooplankton direct counts were made, along with fractionated respiratory activity. Nutrient, C/N ratio, total organic carbon, particulate organic nitrogen, carbon, seston, dissolved oxygen, particulate silica and chlorophyll a determinations were also made. Phytoplankton biomass was low (9.5 11g C I-') and was exceeded by bacterial biomass (89.4 11g C I-') at both spring and neap tides. Bacterial abundance was independent of tidal height and increased with intense water movement at spring tides. Autotrophic production was limited by light penetration and nutrient availability. Most of the respiratory activity in the water column (> 50 %) occurred in the 5 0.8 1tn1 size fraction. Bacterial standing stocks sustained carbon production in the water column Significant negative correlation between bacteria and nanoplankton suggests a trophic structure dependent on dissolved organic carbon inputs from marsh flora, followed by a trophic chaln composed of bacteria, nanoplankton, microzooplankton and Acartia sp. It is suggested that food chains stemming from dissolved organic carbon instead of phytoplankton may play a major role in the system since tidal dynamics enhanced bacter~al standing stocks during spring and neap tides.

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Section: Discussionsupporting

confidence: 51%

Effect of tidal dynamics on a planktonic community in a coastal lagoon of Baja California, Mexico

Morales-Zamorano¹,

Cajal-Medrano²,

Orellana-Cepeda³

et al. 1991

Mar. Ecol. Prog. Ser.

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“…In our study area, during spring and summer, the main physical process that modified the hydrographic conditions near the shore was upwelling driven by the alongshore component of strong winds (>7.5 m s -1 ), resulting in the presence of relatively saltier, colder (<14 ºC) surface water, rich in nutrients (Lara-Lara et al 1980) and DIC, associated with high pCO 2 values. Variability during summer and autumn and during winter and spring is mainly associated fig.…”

Section: Discussionmentioning

confidence: 99%

“…In our study area, the system acted as a sink between September and January. Chávez et al (2007) observed that, on an annual basis, the Pacific coasts and areas close to 30ºN latitude tend to act En nuestra región de estudio, durante primavera y verano, el proceso físico principal que modificó las condiciones hidrográficas cerca de la costa fue la surgencia provocada por vientos fuertes (>7.5 m s -1 ) con componente a lo largo de la costa, lo cual se traduce en la presencia de agua superficial relativamente más salada, más fría (<14 ºC) y ricas en nutrientes (Lara-Lara et al 1980) y en CID, por supuesto asociado a valores altos de pCO 2 . La variabilidad durante verano y otoño y durante invierno y primavera se da básicamente por los patrones de circulación frente al sur de California y el norte de Baja California, como la actividad intensa de mesoescala y el flujo superficial hacia el polo .…”

Section: Discussionunclassified

Water–air carbon fluxes in the coastal upwelling zone off northern Baja California

et al. 2015

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M C INTRODUCTIONA topic of great concern and interest for climatologists and oceanographers is to determine how quickly natural and anthropogenic CO 2 is being absorbed by the oceans. The ocean acts as a large CO 2 sink (Takahashi et al. 2009), and a better understanding of the actual rate of ocean uptake of INTRODUCCIÓNUno de los temas más críticos y de gran interés para climatólogos y oceanólogos es conocer qué tan rápido está siendo absorbido el CO 2 natural y antropogénico por el océano. Dado que el océano es un gran sumidero de CO 2 (Takahashi et al. 2009) ABSTRACT. An important challenge in marine science is to quantify the air-sea flux of carbon because of its possible relation to climate change and the decreasing pH in seawater. In coastal areas of Mexico, the magnitude and variability of carbon fluxes between the ocean and the atmosphere is almost completely unknown. Therefore, the objective of this research was to determine the variability of air-sea carbon fluxes in the upwelling system off northern Baja California. A one-year time series of carbon fluxes was generated from data on partial pressure of carbon dioxide (pCO 2 ) from an oceanographic buoy installed immediately south of Punta Banda (Ensenada, Baja California), which measured salinity, temperature, and pCO 2 in the water (pCO 2water ) and air (pCO 2air ) every 3 h during 2009. The study area presented several upwelling events with low sea surface temperatures (≤14 ºC), salinity <34.0, and high values of pCO 2water , which resulted in an export of excess CO 2 in the water to the atmosphere, identifying the area as a temporary source of CO 2 . In contrast, during the relaxation of upwelling, low values of pCO 2water and intermediate surface temperatures resulted in the sea acting as a sink for CO 2 . The average daily flux was 0.6 ± 0.11 mmol C m ; thus, the system turned out to be a net source of CO 2 from the ocean to the atmosphere.Key words: ocean-atmosphere carbon fluxes, coastal zone, upwelling, North Pacific. RESUMEN.Cuantificar los flujos mar-atmósfera de carbono es un reto ambiental importante por su posible relación con el cambio climático y la disminución del pH del mar. En las zonas costeras de México se desconoce casi totalmente la magnitud y la variabilidad de los flujos de carbono entre el océano y la atmósfera. Por tal motivo, el objetivo de esta investigación fue conocer la variabilidad de los flujos de carbono en el sistema de surgencias frente a Baja California norte. Los flujos de carbono se estimaron de una serie de tiempo de la presión parcial de bióxido de carbono (pCO 2 ) generada a través de una boya oceanográfica instalada inmediatamente al sur de punta Banda, (Ensenada, Baja California), la cual medía salinidad, temperatura y pCO 2 en el agua (pCO 2agua ) y el aire (pCO 2aire ), cada 3 h durante 2009. La zona de estudio presentó varios eventos de surgencias, con temperaturas superficiales del mar bajas (≤14 ºC), salinidad <34.0 y valores altos de pCO 2agua , cuyo resultado fue una exportación del exceso de CO 2 en e...

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“…Now that the satellite ocean color sensor SeaWIFS is flying, new data are needed to test the hypothesis of a relation between P-E parameters and the age of upwelled water in the gulf. Lara-Lara et al (1980) performed 14 C incubations at noon in coastal waters off efecto débil de paquete y valores más altos de a* ph (λ) . No hubo diferencia significativa de valores de φ max entre la cuenca de Guaymas y el umbral, porque los valores más bajos de α* se asociaron con valores más bajos de a* ph(PAR) en el umbral, con respecto a los de la cuenca de Guaymas, de tal manera que la razón se mantuvo relativamente constante espacialmente.…”

Section: Discussionunclassified

Seasonal and spatial characterization of the Gulf of California phytoplankton photosynthetic parameters

1999

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Recibido en enero de 1999; aceptado en agosto de 1999 RESUMENSe analizaron datos de la relación fotosíntesis/irradiancia y de absorción del fitoplancton del Golfo de California, así como datos publicados, con el objetivo de proponer valores promedio de los parámetros fisiológicos para estimar productividad primaria en escalas grandes de tiempo y espacio. Por el momento no es posible predecir variaciones de los parámetros fotosintéticos en las escalas espaciales y temporales finas. Se recomiendan los siguientes promedios para todo el Golfo de California y para condiciones de "invierno" (TºC superficial <22ºC): un P* max = 9.6 ± 2.4 mgC mgChl -1 h -1 (número de asimilación) superficial, con una variación lineal entre éste y 3.7 ± 0.3 en la mitad de la zona eufótica (ze), y luego un valor constante para aguas más profundas; un solo valor de α* inc = 0.029 ± 0.004 mgC mgChl -1 h -1 (µmol cuanta m -2 s -1 ) -1 (pendiente inicial de incubador); y φ max = 0.06 ± 0.01 molC (mol cuanta) -1 (eficiencia cuántica de la fotosíntesis). Para condiciones de "verano" se recomiendan: un P* max = 3.7 ± 0.3 superficial, con una variación lineal entre éste y 1.5 ± 0.2 en la mitad de la ze, y otra variación lineal entre

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Variability and tidal exchange of ecological properties in a coastal lagoon

Cited by 56 publications

References 23 publications

Effect of tidal dynamics on a planktonic community in a coastal lagoon of Baja California, Mexico

Effect of tidal dynamics on a planktonic community in a coastal lagoon of Baja California, Mexico

Water–air carbon fluxes in the coastal upwelling zone off northern Baja California

Seasonal and spatial characterization of the Gulf of California phytoplankton photosynthetic parameters

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