Inverse analysis of the planktonic food web dynamics related to phytoplankton bloom development on the continental shelf of the Bay of Biscay, French coast

Marquis, Elise; Niquil, Nathalie; Delmas, Daniel; Hartmann, Hans J.; Bonnet, Delphine; Carlotti, F.; Herbland, Alain; Labry, Claire; Sautour, Benoît; Laborde, P.; Vézina, Alain F.; Dupuy, Christine

doi:10.1016/j.ecss.2007.01.003

Cited by 40 publications

(31 citation statements)

References 62 publications

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“…However, some information is available in spring, in particular from small pelagic fishery surveys. During late spring and over the period 1998-2008, our average simulated mesozooplankton (~250 mg C/m 2 ) seems underestimated when compared to what is observed (~1880 mg C/m 2 from Irigoien et al, 2009 as well as unpublished data from Pelgas surveys, after conversions considering an homogeneous maximum sampling depth of 100 m), whereas microzooplankton (1160 mg C/m 2 ) seems overestimated based on values (119 mg C/m 2 ) found by Marquis et al (2007). This is difficult to draw any conclusion from these few available data.…”

Section: The Biological Variables Vs In-situ Datacontrasting

confidence: 65%

A multi-decadal hindcast of a physical–biogeochemical model and derived oceanographic indices in the Bay of Biscay

Huret¹,

Sourisseau²,

Petitgas³

et al. 2013

Journal of Marine Systems

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Multiple year oceanographic simulations (hindcast) are identified as a priority oceanography product for fisheries and environment studies since they provide a unique continuous long-term dataset allowing integrated assessment of the ocean state and evolution. We performed a 37 year hindcast run with a coupled physical-biogeochemical model in the Bay of Biscay. The coupled model and the hindcast configuration are described. A model skill assessment is performed with a large set of in-situ data. Average seasonal currents show major circulation patterns over the shelf. Among tracers, temperature and salinity have the best agreement, ahead of nitrates and silicates, chlorophyll, and finally phosphates and ammonium. For chlorophyll, improved pattern statistics are found when compared to monthly composites of satellitederived chlorophyll data. From the hindcast, we derived indices related to mesoscale activity (eddies, plumes, fronts, stratification) and production (chlorophyll and primary production). They help characterise the evolution of the environment in a functional way, on both the seasonal and multi-decadal scales. From these indices, first, a multivariate analysis reveals an increasing number of years that deviate from the mean seasonal pattern. Second, we propose interpretations of the simulated increasing trends detected in several of them (temperature, thermocline depth and primary production). We also recommend further developments to confirm these simulated evolutions, from addition of open boundary forcing with a global circulation model, to the improvement of the dynamics of nutrient regeneration and of the seasonal variability of secondary production. As a perspective, we review the different applications made from our hindcast in relation to anchovy life cycle, a species of major interest in the Bay of Biscay.

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Section: The Biological Variables Vs In-situ Datacontrasting

confidence: 65%

A multi-decadal hindcast of a physical–biogeochemical model and derived oceanographic indices in the Bay of Biscay

Huret¹,

Sourisseau²,

Petitgas³

et al. 2013

Journal of Marine Systems

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“…Up to now in the Bay of Biscay, existing studies on small pelagic fishes (Massé et al 1996, Petitgas 2003 or top predators (Certain et al 2007, Bellier et al 2010) did not refer explicitly to prey-predator relationships, and existing trophic web models (Sanchez & Olaso 2004, Marquis et al 2007) did not emphasise the coupling with apex predator populations. Information derived from the present study can be used to build complete food-web models aimed at testing scenarios of change in ecosystem structure (see Link et al 2009 for a similar approach).…”

Section: Design and Importance Of Ecosystem-based Monitoring Programmesmentioning

confidence: 99%

Investigating the coupling between small pelagic fish and marine top predators using data collected from ecosystem-based surveys

Certain¹,

Massé²,

Canneyt³

et al. 2011

Mar. Ecol. Prog. Ser.

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The present study is a general multivariate analysis of the spatial association between small pelagic fishes and their predators (seabirds, marine mammals and fisheries), using 6 yr (18 000 km) of transects surveyed in spring in the Bay of Biscay, France. We describe 4 groups of prey-predator association, with explicit distinction of prey size: (1) terns and anchovies (10 to 15 cm), (2) common dolphins, common murres, sprat and sardine (< 20 cm), (3) gannets, horse mackerel and mackerel (15 to 25 cm) and (4) bottlenose dolphin, horse mackerel and mackerel (25 to 40 cm). Our analysis also illustrates the great variability in these associations, with years of strong prey-predator associations followed by years of weak relationships. The analysis allows us to formulate predictions about the structure of the upper-pelagic food web in the Bay of Biscay in spring, and constitutes a good starting point for the analysis of data collected during ecosystem-based surveys in the Bay of Biscay. KEY WORDS: Marine top predators · Small pelagic fishes · Spatial associations · Temporal variability · Pelagic ecosystem · Bay of Biscay Resale or republication not permitted without written consent of the publisherMar Ecol Prog Ser 422: [23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39] 2011 death (Ellis & Gabrielsen 2001). However, small pelagic fishes are mobile, clustered and unpredictable prey (Haugland & Misund 2004, Weimerskirch 2007. To cope with the high uncertainty associated with prey distribution and abundance, marine top predators have developed complex foraging strategies, based on optimal foraging paths in a heterogeneous environment (Russell et al. 1992, Viswanathan et al. 1996, Fauchald 1999, Pinaud & Weimerskirch 2005, Benhamou 2007, combined with an extensive use of socially shared information and cues (Davoren et al. 2003, Silverman et al. 2004.Top predator populations may also have an important role in marine ecosystems and examples exist of their perceived pivotal role. Sissenwine et al. (1984) hypothesised that the final collapse of the Georges Bank herring population was due to the presence of fin whales Balaenoptera physalus on the spawning grounds used by the remaining herring, after the stock had been seriously depleted by overfishing. Kenney et al. (1997) estimated that the total amount of fish and squid consumed by marine mammals exceeded fisheries catch in the USA Northeast Continental Shelf ecosystem. Although marine top predators are supposed to be primarily controlled by bottom-up processes, their selective removal in chronically overfished systems can also affect the stability of ecological communities (Bascompte et al. 2005, Myers et al. 2007. In fact, the relative importance of bottom-up versus top-down regulation in open-sea ecosystems is probably a matter of scale, with bottom-up processes evident at large spatial scale, and top-down processes becoming more important at smaller spatial scales (Hunt & McKinnel 2006). Many species of marine top predators (e.g. cetacean...

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“…In fall, low PF flux at Station WH and low PF abundance in the overlying water column contrast with the increased fall phytoplankton production typical at mid-latitudes (Marquis et al, 2007). However, plankton production in fall is, in general, considerably slower and more sporadic than in spring (Laborde et al, 1999;Labry et al, 2004), and could thus explain slow PF production in surface waters and diminished PF flux at depths.…”

Section: Seasonal Variations In Planktic Foraminiferal Test Fluxmentioning

confidence: 96%

Flux dynamics of planktic foraminiferal tests in the south-eastern Bay of Biscay (northeast Atlantic margin)

Kuhnt¹,

Howa²,

Schmidt³

et al. 2013

Journal of Marine Systems

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International audienceThe temporal and water depth related dynamics of planktic foraminiferal fluxes in the south-eastern Bay of Biscay are discussed for a two year sampling period (June 2006-June 2008). Two sediment traps deployed at 800 m and 1700 m water depth at a mooring in 2000 m of water depth, were analyzed for the flux of planktic foraminiferal species > 150 μm, in comparison with the total mass flux. Total flux of planktic foraminifera shows seasonal maxima in spring/early summer (> 2000 Ind. m− 2 d− 1) and minima from late summer through winter (< 10 Ind. m− 2 d− 1). The flux of planktic foraminiferal tests in the intermediate to deep water column at the inner Bay of Biscay comprises an intermittent and regionally variable signal of seasonal surface water primary productivity. Significant lateral transport and flux of particles superimposed on the downward mass flux indicate a decoupling of fluxes between the 800-m and 1700-m traps. The 210Pb budget and the presence of certain benthic foraminiferal species in the midwater column prove that the lateral flux originated from the upper continental slope. Despite the temporal and vertical variations of the particulate flux, a well-defined seasonal flux signal can be deduced from the frequency of planktic foraminiferal species

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Inverse analysis of the planktonic food web dynamics related to phytoplankton bloom development on the continental shelf of the Bay of Biscay, French coast

Cited by 40 publications

References 62 publications

A multi-decadal hindcast of a physical–biogeochemical model and derived oceanographic indices in the Bay of Biscay

A multi-decadal hindcast of a physical–biogeochemical model and derived oceanographic indices in the Bay of Biscay

Investigating the coupling between small pelagic fish and marine top predators using data collected from ecosystem-based surveys

Flux dynamics of planktic foraminiferal tests in the south-eastern Bay of Biscay (northeast Atlantic margin)

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