Plankton distribution across a slope current-induced front in the southern Bay of Biscay

Fernández, E.; Cabal, J.; Acuña, José Luis; Bode, Antonio; Botas, Alfonso; García-Soto, Carlos

doi:10.1093/plankt/15.6.619

Cited by 92 publications

(63 citation statements)

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“…A marked seasonal pattern driven by spring surface heating and winter mixing is evident. This general pattern, characteristic of temperate seas, was modified by several episodic hydrodynamic events, mainly slope currents and wind-driven coastal upwellings, a complete description of which is given elsewhere (Botas et al 1990, Fernandez et al 1993. Fig.…”

Section: Physical and Chemical Characteristicsmentioning

confidence: 92%

Seasonal compensation of microbial production and respiration in a temperate sea

Serret¹,

Fernández²,

Sostres³

et al. 1999

Mar. Ecol. Prog. Ser.

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Gross oxygen production (GP), dark respiration (DR) and net community production (NCP) were studied for 16 mo in the euphotic layer of 3 stations through the coastal transitional zone of the southern Bay of Biscay, and related to hydrographic and nutrient conditions, phytoplankton biomass and C incorporation. Microbial O2 fluxes exhibited seasonal patterns linked to the seasonal cycle of water column stratification and mixing, with positive NCP during the spring, negative throughout the summer and close to zero in winter. This pattern was altered at coastal regions, where productive periods were linked to coastal upwelling, whereas in winter persistent net heterotrophy was measured, presumably in relation to increases in organic matter discharge of continental origin. The comparison of NCP with O2 anomaly and No3 concentration in the euphotic zone, the spatial and temporal scales studied and the prevalence of steady-state conditions offshore support the conclusion that the maintenance of summer heterotrophy in the region was based upon the consumption of the surplus of organic matter produced in spring. The uncoupling in the microbial auto-and heterotrophic metabolisms, based on the accumulation and delayed consumption of dissolved organic matter as a consequence of the processes controlling phytoplankton growth and microbial heterotrophic activity in temperate seas, would explain such a pattern. The close relationshp observed between the seasonal variability in NCP and the magnitude of spring net production and predictions derived from the seasonal cycles of O2 anomaly in middle latitudes and atmospheric O2 led us to conclude that the seasonal compensation of production and respiration processes is a characteristic of the dynamics of the pelagic ecosystem, at least in coastal temperate seas. The implications of this conclusion are of great relevance for the interpretation of new production and the estimation of the trophic status of the ocean from direct measurements of plankton net production.

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Section: Physical and Chemical Characteristicsmentioning

confidence: 92%

Seasonal compensation of microbial production and respiration in a temperate sea

Serret¹,

Fernández²,

Sostres³

et al. 1999

Mar. Ecol. Prog. Ser.

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“…Behavioural responses of zooplankters may counteract or be adapted to external dispersive forcing to maintain the structure of the community. Although tidal effect, wind induced mixing and eddies play a significant role in the temporal distribution of the zooplankton (Fernández et al, 1993), zooplankters may behave as active drifters rather than passive drifters to maintain the same community structure even during periods of high turbulent mixing driven by wind stress (Wiafe and Frid, 1996). Species which were separated in space and are brought together by mixing, will remain in an area once the mixing intensity decreases.…”

Section: Discussionmentioning

confidence: 99%

Short-term changes in the plankton of a highly homogeneous Basin of the Straits of Magellan (Paso Ancho) during spring 1994

Antezana¹,

Hamamé²

1999

Sci. Mar.

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SUMMARY: Changes in nutrients, chlorophyll and zooplankton were followed for 11 d in a basin of the Straits of Magellan (Paso Ancho), characterized by a homogeneous water column during a spring event defined by a drastic change in wind stress and direction. Conditions hardly seemed conducive to a phytoplankton bloom. Initial conditions were characterized by SW gales, low nutrients as well as by Chaetoceros spp. and Thalassiosira spp. dominated phytoplankton. Wind switched abruptly to calm-weak northerlies by the middle of the study period, a subsurface chlorophyll peak developed and extended to the end of the study while nitrates decreased. Zooplankton was dominated by copepods, nauplii and a diverse meroplankton assemblage. Zooplankton composition was rather uniform, except for diel changes in some taxa. Gut contents of zooplankton size fractions (including Euphausia vallentini as the largest fraction) were measured. Grazing rates accounted for 0.5 % of the available chlorophyll. Phytoplankton blooming may be explained by transient water stratification resulting from the relaxation of wind stress and eventual retention of the phytoplankton in the photic layer. Minor variability in zooplankton implied the existence of a permanent and distinct assemblage in a strongly homogeneous environment. -Se siguieron los cambios en nutrientes, clorofila y zooplancton durante 11 días en una cuenca del Estrecho de Magallanes (Paso Ancho), caracterizada por una columna de agua homogénea durante un evento de primavera definido por un cambio drástico en la dirección y velocidad del viento. Las condiciones no permitían preveer una proliferación del fitoplancton. Las condiciones iniciales fueron de ventarrones del SW, bajos nutrientes y fitoplancton dominado por Chaetoceros spp. y Thalassiosira spp. El viento cambió abruptamente a calma y vientos débiles del Norte cerca de la mitad del período de estudio, se desarrolló un máximo subsuperficial de clorofila que perduró hasta el fin del estudio, mientras que los nitratos disminuyeron. El zooplancton estuvo dominado por copépodos, nauplii y un conjunto diverso de meroplancton. La composición del zooplancton fue uniforme, excepto por los cambios diurno-nocturnos de algunos taxones. Se midió el contenido estomacal de fracciones de tamaño del zooplancton (la fracción mayor correspondió a Euphausia vallentini). Las tasas de ingestión alcanzaron al 0.5% de la clorofila disponible. La proliferación del fitoplancton puede explicarse por una estratificación transitoria de la columna de agua debida a la relajación del viento y la consecuente retención del fitoplancton en la capa fótica. La escasa variabilidad del zooplancton implica la permanencia de un conjunto característico en un ambiente homogéneo.Palabras clave: Estuarios, columna de agua homogénea, proliferación algal, fracciones de tamaño, ingestión del zooplancton.

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“…In general, planktonic organisms show dense distributions around oceanic fronts, because of mechanical accumulation and higher biological production associated with the fronts (e.g. Fernandez et al 1993, Lima et al 2002. The observed dense distribution of F. pellucida is not thought to be due only to passive accumulation, because other oceanic appendicularian species did not occur in such high concentrations as F. pellucida.…”

Section: The Dominance Of Oikopleura Longicauda and Fritillaria Pellumentioning

confidence: 99%

Species composition and horizontal distribution of the appendicularian community in waters adjacent to the Kuroshio in winter^|^ndash;early spring

Hidaka

2008

Plankton Benthos Res

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Plankton distribution across a slope current-induced front in the southern Bay of Biscay

Cited by 92 publications

References 0 publications

Seasonal compensation of microbial production and respiration in a temperate sea

Seasonal compensation of microbial production and respiration in a temperate sea

Short-term changes in the plankton of a highly homogeneous Basin of the Straits of Magellan (Paso Ancho) during spring 1994

Species composition and horizontal distribution of the appendicularian community in waters adjacent to the Kuroshio in winter^|^ndash;early spring

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