Plankton response following a spring upwelling event in the Ria de Arosa, Spain

Rb, Hanson; Alvarez-Ossorio, MT; Cal, Rosa; Campos, MJ; Roman, Monsi; Santiago, Gerardo Garcia; Varela, Manuel; Yoder, J.A.

doi:10.3354/meps032101

Cited by 52 publications

(37 citation statements)

References 12 publications

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“…Bacterial abundance values in this study are within the range found before at station 2 between January 1995 and December 1997 (0.6-30.6 x 10 5 cell ml -1 , Barquero, 1999), as well as within the range of the published values for other coastal areas in northern Spain (Hanson et al, 1986;Unanue et al, 1992;Tenore et al, 1995;Barquero et al, 1998;Morán et al, 1999;Barbosa et al, 2001;Varela et al, in press), with the exception of abundance values of highly eutrophic systems such as the Ría de Vigo (4.9-62.0 x 10 5 cell ml -1 , Zdawnoski and Figueiras, 1997). The relatively low variation in bacterial abundance when compared with other variables (e.g.…”

Section: Temporal Variationssupporting

confidence: 67%

“…) coincides with the minimum found by Tenore et al (1995) in samples from the Galician shelf, while the maximum production (145.2 mg C m -3 d -1 ) is higher than most values reported (1.0-3.8 mg C m -3 d -1 , Hanson et al, 1986;13.9-48.6 mg C m -3 d -1 , average of cold and warm season respectively, Unanue et al, 1992;0.1-28.7 mg C m -3 d -1 , Tenore et al, 1995;0.9-48.4 mg C m -3 d -1…”

Section: Temporal Variationsmentioning

confidence: 33%

“…When considering factors controlling bacterial production, some studies in upwelling areas found a negative relationship between upwelling pulses and bacterial production (Sorokin and Kogelschatz, 1979;Sorokin, 1981;Hanson et al, 1986;Bak and Nieuwland, 1993;Tenore et al, 1995;Barquero et al, 1998), concluding that the latter decays during the initial stages of the upwelling process but increases as the upwelling relaxes. However, in this study there was no clear relation between upwelling pulses and bacterial production, probably because the sampling frequency employed was not very suitable for the study of this relationship.…”

Section: Temporal Variationsmentioning

confidence: 99%

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Variations in planktonic bacterial biomass and production and phytoplankton blooms off A Coruña (NW Spain)

Valencia¹,

Abalde²,

Bode³

et al. 2003

Sci. Mar.

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SUMMARY: Bacterial abundance, biomass and heterotrophic activity, along with hydrographic and phytoplankton variables, were measured from February 1998 to September 1999 at two coastal stations off A Coruña (Galicia, NW Spain). Bacterial abundance varied from 0.1 to 1.8 x 10 6 cells ml -1 and water-column integrated bacterial production ranged from 34 to 1132 mg C m -2 d -1 . Two annual maxima of bacterial abundance and production were observed, in spring and summer, although relatively high abundance values remained until autumn. In autumn and winter production values were low with the exception of the results obtained in November 1998, when the highest values of bacterial production of the whole study were observed at both stations. Bacterial biomass constituted a significant, but low, fraction of particulate organic carbon (4-21 %) and was always lower than phytoplankton biomass (up to 40% of phytoplankton carbon). Also, bacterial production was generally < 30% of primary production, but in some situations (as in early spring or in autumn) bacterial production exceeded primary production, suggesting a delayed response of bacterial activity after a phytoplankton bloom.Key words: bacterial production, bacterial abundance, phytoplankton biomass, primary production, phytoplankton blooms, NW Spain. RESUMEN: VARIACIONES EN LA BIOMASA Y PRODUCCIÓN DE LAS BACTERIAS PLANCTÓNICAS, Y EN LAS PROLIFERACIONES DE FITOPLANCTON ENLA COSTA DE A CORUÑA (NO ESPAÑA). -Se midió la abundancia, biomasa y actividad heterotrófica bacteriana, junto con variables hidrográficas y fitoplanctónicas, entre febrero de 1998 y septiembre de 1999 en dos estaciones costeras de A Coruña (Galicia, NO España). La abundancia bacteriana varió entre 0.1 y 1.8 x 10 6 células ml -1 y la producción bacteriana integrada en la columna de agua tomó valores entre 34 y 1132 mg C m -2 d -1 . Se observaron dos máximos de abundancia y producción bacteriana en primavera y verano, aunque se mantuvieron valores relativamente altos de abundancia durante el otoño. En otoño e invierno los valores de producción fueron bajos con la excepción de los resultados obtenidos en noviembre de 1998, donde se observaron los mayores valores de producción de todo el estudio en ambas estaciones. La biomasa bacteriana constituyó una fracción significativa, aunque baja, del carbono orgánico particulado (4-21%) y fue siempre menor que la biomasa del fitoplancton (hasta un 40% del carbono fitoplanctónico). Del mismo modo, la producción bacteriana fue generalmente < 30% de la producción primaria, aunque en ciertas situaciones (como a principios de primavera o en otoño) la producción bacteriana excedió a la producción primaria, lo que sugiere un retraso en la respuesta de la actividad bacteriana a la proliferación del fitoplancton.Palabras clave: producción bacteriana, abundancia bacteriana, biomasa de fitoplancton, producción primaria, proliferaciones de fitoplancton, NO España.

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Section: Temporal Variationssupporting

confidence: 67%

Section: Temporal Variationsmentioning

confidence: 33%

Section: Temporal Variationsmentioning

confidence: 99%

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Variations in planktonic bacterial biomass and production and phytoplankton blooms off A Coruña (NW Spain)

Valencia¹,

Abalde²,

Bode³

et al. 2003

Sci. Mar.

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“…the frequently observed correlation to measures of phytoplankton biomass or production), specific growth rates generally appear to be densityindependent (cf. , Hanson et al 1986). …”

Section: Structure Of the Pelagic Food Webmentioning

confidence: 99%

The structure of the pelagic food web in relation to water column structure in the Skagerrak

Kiørboe¹,

Kaas²,

Kruse³

et al. 1990

Mar. Ecol. Prog. Ser.

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The distribution, composition and activity of phytoplankton, and accompanying changes in specific activities of bacterioplankton and copepods, were related to variahons in the vertical structure of the water column along a transect through the Skagerrak in May 1987. The Skagerrak is charactenzed by a doming of the pycnocline, with a deep mixed layer along the periphery and a very shallow pycnochne in central parts Average phytoplankton size increased with the depth of the upper mixed layer, and the central stratified area was characterized by small flagellates while large and chainforming diatoms dominated along the periphery. In situ fecundities of 2 copepod species (Ternora long~cornis and Acarha c l a u s~) increased linearly with the concentration of phytoplankton (chl a ) > 8 pm and were, therefore, highest along the Skagerrak margin. Specific growth rates of bactenoplankton appeared to depend on particle surface area rather than particle volume or chla, and showed a distributional pattern that was nearly the inverse of the distribution of copepod activity. That is, peak bacterial growth rates occurred in central, stratified parts and lower rates were found along the margin with a deep mixed layer. Thus a 'microbial loop' type of food web seemed to be evolving in the central, strongly stratified parts of the Skagerrak, while a shorter 'classical' type of food web appeared to dominate along the margin. The relation between food web structure and verucal mixing processes observed on oceanwide scales, e.g. between oligotrophic ocean gyres and the major upwelling systems, thus seems to recur on much smaller honzontal scales.

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“…However, Alvarez-Salgado et al [1993] discuss the potential contribution of mineralization of organic matter outwelling from the rias contributing to the nutrient pool of the shelf waters. Mixing of intruded NACW with the lower-salinity waters in the rias occurs in the middle and inner Ria de Arosa [Hanson et al, 1986]. …”

Section: Mesoscale Spatial and Temporal Patterns In The Galician Shelmentioning

confidence: 99%

Fisheries and oceanography off Galicia, NW Spain: Mesoscale spatial and temporal changes in physical processes and resultant patterns of biological productivity

Tenore¹,

Alonso-Noval²,

Alvarez-Ossorio³

et al. 1995

J. Geophys. Res.

112

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Abstract. The Galician shelf off NW Spain (43N ø 9W ø) exhibits mesoscale spatial and temporal changes in biological productivity associated with upwelling. Spatial heterogeneity results from local geomorphic and land-sea interactions superimposed on the large scale atmospheric processes that produce upwelling. Wind-induced upwelling events, commonly of short (i.e., week) duration, are more common in the summer than in the winter. A series of cruises, including some time series sampling, and satellite imagery analysis showed that surface upwelling was more common and persistent on the northern coast compared with the western coast off the coastal embayments, the Rias Bajas. Nearshore off the rias, coastal runoff, which is greater in the rainy winter/spring versus the dry summer, affected upwelling. In early summer, upwelling less often reaches the surface because of increased water column stratification associated with lower surface salinities and thus upwelling is not detected by satellite imagery. Conversely, in late summer, upwelling more often reaches the surface because coastal runoff is reduced during the dry summer months and the water column tends to be less stratified. Plankton biomass and rate processes along the Galician shelf reflected both ambient hydrographic conditions as well as prior history of upwelling or downwelling. Phytoplankton and bacterioplankton were in greatest abundance during upwelling conditions (June through August); in contrast, both zooplankton and fish larvae exhibited highest abundances in March, when there were upwelling conditions prior to our cruise. Spatial differences in the duration and frequency of upwelling events, in combination with advection of water masses, are critical to the patterns of water column productivity and sardine fisheries production off the Galician coast. More persistent upwelling at this NW corner of the Iberian peninsula supports large sardine fisheries because zooplankton and larval fish populations have time to respond to the higher primary production. Farther down the western Galician coast, the episodic upwelling and resultant intermittent primary production does not support a stable food supply needed to support fisheries. Times series sampling revealed mean response times of bacteria, phytoplankton, and zooplankton to be on the order of a day, days, and weeks, respectively. Sardines showed no spawning response in the relatively short time series sampling. The observed distributional patterns of fish eggs and larvae showed some offshore transport of fish larvae that were spawned inshore during upwelling periods and aggregation of larvae in a convergence zone northwest of Cabo Villano.

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Plankton response following a spring upwelling event in the Ria de Arosa, Spain

Cited by 52 publications

References 12 publications

Variations in planktonic bacterial biomass and production and phytoplankton blooms off A Coruña (NW Spain)

Variations in planktonic bacterial biomass and production and phytoplankton blooms off A Coruña (NW Spain)

The structure of the pelagic food web in relation to water column structure in the Skagerrak

Fisheries and oceanography off Galicia, NW Spain: Mesoscale spatial and temporal changes in physical processes and resultant patterns of biological productivity

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