The relationship of upwelling to mussel production in the rias on the western coast of Spain

Blanton, Jackson O.; Tenore, Kenneth R.; Castillejo, F.; Atkinson, Larry P.; Schwing, Franklin B.; Lavin, Amy

doi:10.1357/002224087788401115

Cited by 167 publications

(107 citation statements)

References 1 publication

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“…Intensive seasonal measurements of primary production within the Iberian upwelling system are yet too scarce to quantify this effect on phytoplankton production. However, such a relationship was implied by the results of Blanton et al (1987), showing that a 2-fold year-to-year variation of the meat quality of harvested m.ussels in the rias could be accounted for by interannual variations in upwelling intensity along the Galician coast. Although several recent studies have pointed to the occurrence of a long-term increase in upwellingfavourable winds in this area (Fraga & Bakun 1993, Binet 1997, Nogueira et al 1997, the wind regime in 1991 could be considered typical for the NW Iberian upwelling system with a mean Iw from April to September (+394 m3 S-' km-') very near the 16 yr average presented by Blanton et al (1987) for the same period of the year from 1969 to 1985 (+379 * 182 m3 S-' km-').…”

Section: Discussionmentioning

confidence: 99%

“…The overall control of the hydrodynamic regime on biological activity inside the rias has been particularly well studied with regards to phytoplankton succession (Figueiras & Pazos 1991, Figueiras & Nos 1993, bacterial abundance (Zdanowski & Figueiras 1997), mussel secondary production (Tenore et al 1982, Blanton et al 1987) and certain aspects of biogeochernical cycles in the rias (Prego 1993, 1994, Alvarez-Salgado et al 1996a. On a larger scale, the influence of the high productivity of the Galician Rias extends to the nearby Atlantic shelf, where part of the high biomass produced in the rias is exported and remineralised , Prego & Bao 1997) leaving a distinct signature on the distribution of the chemical (Fraga 1981, Alvarez-Salgado et al 1993 and biological (Estrada 1984) characteristics of the open shelf waters.…”

Section: Introductionmentioning

confidence: 99%

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Seasonal and short-time-scale dynamics of microplankton community production and respiration in an inshore upwelling system

Moncoiffé¹,

Álvarez-Salgado²,

Figueiras³

et al. 2000

Mar. Ecol. Prog. Ser.

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An intensive study of pelagc primary production and microplankton community respiration was carried out during an entire upwehng season in the Ria de Vigo (NW Spain). From April to November measurements of oxygen production and respiration using the hght-dark bottle technique were made twice a week at the surface. l % Light depth ( l % LD, 12 r 4 m) and 40 m (8 m above sea floor) alongside routine physical, chemical and biological measurements. During the major part of the survey period intermittent intrusions of cold, nutrient-rich upwelled water were observed In the ria with a periodicity of about 2 wk. Rates of gross primary production (GPP) were high but variable averaging 37.3 + 30.7 pM O2 d-' and 3.6 + 4.8 pM O2 d-' at the surface and l % LD respectively over the period of survey (n = 50). Rates of dark community respiration (DCR) were also high and variable with maximum values being observed in the surface layer where the seasonal average was 12.2 * 9.8 pM O2 d-l. At the l % LD and 40 m, DCR averaged 5.3 + 4.4 and 2.8 * 3.0 I.IM O2 d-l respectively. Although seasonal average and maximal DCR (up to 46.5 pM 0, d-l) were among the highest reported for coastal areas, microplankton production over the period of survey was dominated by autotrophic processes. Respiration losses by the microplankton community in the euphotic zone represented on average 43 % of estimated mean seasonal water column GPP (2.1 to 2.7 g C m-' d-l). Net heterotrophy in the aphotic layer consumed the equivalent of a further 25% of estimated water column GPP. The degree of coup h g between primary production and respiration was primarily controlled by upwelling. Dunng upwelling events respiration was generally low in the water column but it increased as a linear function of chlorophyll a concentrat~on (R2 = 0.55. n = 13) and GPP (R2 = 0.47, n = 13) in the surface layer. Under such condition phytoplankton appears as the dominant component of community respiration consuming 14 % of GPP. During penods of upwelling relaxation respiration was high relative to GPP High water column respiration rates extending occasionally down to 40 m took place at the expense of organic matter trapped inside the bay. The seasonal breakdown of thermal stratification in autumn presented a relationship between surface respiration and chlorophyll a or GPP similar to that observed during upwelling events. The large excess primary production during this period was not remineralised inside the ria, suggesting that a large fraction may be exported towards the shelf.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Seasonal and short-time-scale dynamics of microplankton community production and respiration in an inshore upwelling system

Moncoiffé¹,

Álvarez-Salgado²,

Figueiras³

et al. 2000

Mar. Ecol. Prog. Ser.

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“…The density-driven flow (gravitational convection) is strongly influenced by the freshwater contribution, the wind regime along the main axis of the rías and the upwelling-downwelling events (Blanton et al 1987, Prego & Fraga 1992, Rosón et al 1997 control the water exchange between the rías and the shelf. The Ría de Vigo, the southernmost of the Rías Baixas, is 2160 km 2 in area, 23.3 km 3 in capacity, and averages 221 m depth with a maximum depth of 245 m in the main channel.…”

Section: Methodsmentioning

confidence: 99%

Anatomical differences among Atlantic and Mediterranean populations of Trisopterus luscus (Pisces)

et al. 2009

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“…Figueiras et al (2002) showed that upwelling/ downwelling dynamics adjacent to the Galician Rías affected phytoplankton biomass and seston quality, which were shown by Fernández-Reiriez et al (1996) to drive mussel growth rates. Blanton et al (1987) had previously shown that upwelling indices (along-shelf winds) off Galicia were linked to mussel condition index, through the linkages with seston. This set of studies, along with ours in Pelorus Sound, are, to our knowledge, the only ones which have demonstrated linkages from climatic variation in physical forcing to formation of seston biomass, through to bivalve aqua culture yield.…”

Section: Forcing Of Seston Biomass and Mussel Aquaculture Yield Withimentioning

confidence: 99%

Influence of climate on Pelorus Sound mussel aquaculture yields: predictive models and underlying mechanisms

Zeldis¹,

Hadfield²,

Booker³

2013

Aquacult. Environ. Interact.

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Multiple regression models were used to predict aquaculture production in Pelorus Sound, a 50 km long estuary supporting 68% of New Zealand's greenshell mussel Perna canaliculus aquaculture industry (worth NZ$ 204 million per annum). Mussel meat yield was modelled using both biological predictors, including seston (indexed by particulate nitrogen, PN), phytoplankton and nutrients collected over 9 yr (July 1997 to November 2005 by the mussel industry, and physical, climatic predictors, including Southern Oscillation Index (SOI), along-shelf winds, sea surface temperature (SST) and Pelorus River flow, held in New Zealand national databases. Yield was best predicted using biological predictors collected locally at the farms inside the sound, but it was also predictable using only physical predictors collected distant from the farming region. Seston (mussel food) was also predictable using the physical predictors. Optimal predictor sets for yield and seston differed between summer and winter half-years. In summer, deep water (which enters the sound through the estuarine circulation) at the sound entrance was nitrate (NO 3 − )-rich during upwelling conditions (negative SOI, NNW wind stress and cool SST). The increased NO 3 − levels, in turn, triggered increased PN within the sound. In the winter half-year, PN was unrelated to upwelling and NO 3 − effects at the entrance and was instead related to river flow. Remotely-sensed SST data showed that in summer, upwelling affected the entrance waters of the sound under negative SOI and upwelling-favourable wind stress, patterns which dissipated in winter. Overall, these results show that time series of physical drivers can be useful for explaining production variation of farmed bivalves and indicate the prospects for using data routinely collected in national databases for predicting mussel yield.

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The relationship of upwelling to mussel production in the rias on the western coast of Spain

Cited by 167 publications

References 1 publication

Seasonal and short-time-scale dynamics of microplankton community production and respiration in an inshore upwelling system

Seasonal and short-time-scale dynamics of microplankton community production and respiration in an inshore upwelling system

Anatomical differences among Atlantic and Mediterranean populations of Trisopterus luscus (Pisces)

Influence of climate on Pelorus Sound mussel aquaculture yields: predictive models and underlying mechanisms

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