Can Satellite-derived Chlorophyll Imagery Be Used to Trace Surface Dynamics in Coastal Zone? A Case Study in the Northwestern Mediterranean Sea

Forget, Philippe; Andre, G.

doi:10.3390/s7060884

Cited by 13 publications

(7 citation statements)

References 47 publications

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“…The GoL, receiving discharges from the Rhone River, has much higher nutrient and phytoplankton concentrations than the adjacent open NW Mediterranean [90], [91]. In the GoL, ocean color studies using remote sensors (e.g., CZCS, MERIS) have revealed strong spatial variation in the distribution of chlorophyll [92]–[94]. In this area, the coastal eddies transport organic matter from the coastal zone to the offshore domain [95].…”

Section: Discussionmentioning

confidence: 99%

Modeling Fish Egg Production and Spatial Distribution from Acoustic Data: A Step Forward into the Analysis of Recruitment

et al. 2013

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To date, there are numerous transport simulation studies demonstrating the relevance of the hydrodynamics for the advection, dispersion and recruitment of early stages of marine organisms. However, the lack of data has conditioned the use of realistic locations for the model setup and configuration in transport studies. This work (I) demonstrates the key role played by the use of the realistic initial position of the eggs of small pelagic fishes in the analysis of late-larval recruitment in coastal nursery areas and (II) provides a general solution for deriving future egg positions and abundances from adult biomass obtained from acoustic surveys and available fecundity data. Using European anchovy in the NW Mediterranean as a case study, we first analyzed the impact of the initial location, timing, egg buoyancy and diel vertical migration of larvae on the potential late-larval recruitment to coastal areas. The results suggested that prior knowledge of the initial spawning grounds may substantially affect the estimates of potential recruitment. We then integrated biological and acoustics-derived data (the biomass and size structure, sex ratio, a weight-batch fecundity model, mean weight, number of fish and mean spawning) to build a predictive model for interannual egg production. This model was satisfactorily contrasted with field data for two years obtained with the Daily Egg Production Method (DEPM). We discuss our results in the context of the fluctuations of European anchovy egg abundance from 2003 through 2010 in the NW Mediterranean and in terms of the potential applicability of the acoustics-based spatial predictive egg production model.

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Section: Discussionmentioning

confidence: 99%

Modeling Fish Egg Production and Spatial Distribution from Acoustic Data: A Step Forward into the Analysis of Recruitment

et al. 2013

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“…In the northwestern part of the Gulf of Lions, the presence of two large rivers, the Rhone and the Muga Rivers (Fig. 1), together with an existing upwelling along the coast (Forget and André, 2007) results in a local increase of productivity.…”

Section: Discussionmentioning

confidence: 99%

“…Occasional coastal upwelling is generated by local wind systems and complex orographic effects (Millot, 1990; Lloret et al. , 2001; Forget and André, 2007).…”

Section: Introductionmentioning

confidence: 99%

Habitat suitability modelling for sardine juveniles (Sardina pilchardus) in the Mediterranean Sea

Giannoulaki

Pyrounaki

Liorzou

et al. 2011

Fisheries Oceanography

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Identification of potential juvenile grounds of shortlived species such as European sardine (Sardina pilchardus) in relation to the environment is a crucial issue for effective management. In the current work, habitat suitability modelling was applied to acoustic data derived from both the western and eastern part of the Mediterranean Sea. Early summer acoustic data of sardine juveniles were modelled using generalized additive models along with satellite environmental and bathymetry data. Selected models were used to construct maps that exhibit the probability of presence in the study areas, as well as throughout the entire Mediterranean basin, as a measure of habitat adequacy. Areas with high probability of supporting sardine juvenile presence persistently within the study period were identified throughout the Mediterranean Sea. Furthermore, within the study period, a positive relationship was found between suitable habitat extent and the changes in abundance of sardine juveniles in each study area.

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“…The area of study, the Gulf of Lions in the northwestern Mediterranean, is highly productive compared with the generally oligotrophic Mediterranean Sea (Bakun and Agostini 2001), owing primarily to water discharges from the Rhône River and the dominant northern winds that distribute nutrients and particulate organic matter along the entire continental shelf (Estrada 1996, Salat 1996 and can even cause occasional small upwelling events (Forget and André 2007). Additionally, this area is a very important nursery habitat for both European anchovy (Engraulis encrasicolus) and sardine (Giannoulaki et al 2011(Giannoulaki et al , 2013.…”

Section: Introductionmentioning

confidence: 99%

Feeding of European pilchard (<em>Sardina pilchardus</em>) in the northwestern Mediterranean: from late larvae to adults

Costalago¹,

Palomera²

2014

Sci. Mar.

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Summary:We assessed the relative importance of different prey types of the European pilchard (European sardine) from the late larval to the adult stage. Two different methodologies for analysing stomach contents were used to describe the trophic dynamics of sardine and the relationship of sardine feeding behaviour with the ontogenetic development of body structures used for feeding, such as gill rakers and pyloric caeca. This information is essential to accurately depict the use of the planktonic resources in the area by sardine and to discuss the extent to which the sardine population could be affected by environmental changes in the Mediterranean Sea. We showed that cladocerans in summer and diatoms in winter were numerically the most important prey types for both juveniles and adults. However, decapod larvae were the most important prey during all seasons in terms of carbon content. Accordingly, differences in methodology should be considered in the analysis of sardine diets. An analysis of the composition of the plankton showed that small copepods were strongly selected by sardines at all ages and in both seasons. We also observed that the pyloric caeca began to grow when the sardines were approximately 4-5 cm standard length (SL) and ended their development when the sardines reached approximately 8 cm SL, whereas the gill rakers appeared to be completely functional when the sardines reached 7 cm SL. Therefore, filter feeding of small particles could be performed with total efficacy beginning at 7-8 cm SL. In view of the energetic advantage of filter feeding in a well-adapted filter-feeding species such as sardine, the prospective limited availability of small particles hypothesized by certain authors for the Mediterranean could have negative consequences for sardine. This study demonstrates that sardine populations, given their extremely high dependence on the lower marine trophic levels, could be strongly affected by alterations in the environment and in the planktonic community.Keywords: Sardina pilchardus; northwestern Mediterranean; ontogeny; trophic ecology; small pelagic fish. Alimentación de la sardina europea (Sardina pilchardus) en el Mediterráneo noroccidental: de post-larva a adultoResumen: Analizamos la importancia relativa de los diferentes tipos de presas de la sardina europea, desde post-larvas hasta adultos. Se usaron dos métodos diferentes de análisis de los contenidos estomacales para describir la dinámica trófica de la sardina y la relación de su comportamiento alimenticio con el desarrollo ontogénico de las estructuras corporales que usa en el proceso alimenticio, como las brianquispinas y los ciegos pilóricos. Esta información es esencial para obtener una imagen precisa de los recursos planctónicos de los que dispone la sardina en el área y para discutir de qué forma la población de sardina podría verse afectada por cambios medioambientales en el mar Mediterráneo. Mostramos que los cladóceros, en verano, y las diatomeas, en invierno, fueron los tipos de presas más importantes tanto para...

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Can Satellite-derived Chlorophyll Imagery Be Used to Trace Surface Dynamics in Coastal Zone? A Case Study in the Northwestern Mediterranean Sea

Cited by 13 publications

References 47 publications

Modeling Fish Egg Production and Spatial Distribution from Acoustic Data: A Step Forward into the Analysis of Recruitment

Modeling Fish Egg Production and Spatial Distribution from Acoustic Data: A Step Forward into the Analysis of Recruitment

Habitat suitability modelling for sardine juveniles (Sardina pilchardus) in the Mediterranean Sea

Feeding of European pilchard (<em>Sardina pilchardus</em>) in the northwestern Mediterranean: from late larvae to adults

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