Effects of seasonal variability in across- and alongshore transport of anchoveta (Engraulis ringens) larvae on model-based pre-recruitment indices off central Chile

Parada, Carolina; Colas, François; Soto-Mendoza, Samuel; Castro, Leonardo R.

doi:10.1016/j.pocean.2011.07.015

Cited by 21 publications

(15 citation statements)

References 47 publications

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“…The model results have a more coastal pattern than the in situ data and some aggregations produced by the model were not observed in the field data. Similar disagreements have already been reported in investigations using ROMS and Ichthyop for the transport and retention of eggs and larvae of small pelagic fishes (Brochier et al, 2008a;Parada et al, 2012;Soto-Mendoza et al, 2012). These differences can be related to the lack of knowledge about the biological characteristics of the species, such as predation and feeding.…”

Section: Performance and Limitations Of The Modelssupporting

confidence: 69%

Modeling the spawning strategies and larval survival of the Brazilian sardine (Sardinella brasiliensis)

Dias

Pezzi

Gherardi

et al. 2014

Progress in Oceanography

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Section: Performance and Limitations Of The Modelssupporting

confidence: 69%

Modeling the spawning strategies and larval survival of the Brazilian sardine (Sardinella brasiliensis)

Dias

Pezzi

Gherardi

et al. 2014

Progress in Oceanography

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“…The objective was to study the main seasonal patterns of transport, retention, and recruitment System, larval anchovy retention is only 20-54% from October to June (Brochier et al 2008a, Parada et al 2012. In the Benguela Current Upwelling System the percentage of retention of Sardinops sagax eggs and larvae are 24-48% in South Africa Agulhas Bank spawning grounds and 13-52% in the west coast spawning areas (Miller et al 2006).…”

Section: Discussionmentioning

confidence: 99%

“…This coupled biophysical technique is valuable to understand the interaction between biology and the environment. It has been used for modelling the dispersal of sardine and anchovy ichthyoplankton in the Benguela (e.g., Huggett et al 2003, Miller et al 2006, Koné et al 2013, Lett et al 2015, Humboldt (Brochier et al 2008a, Parada et al 2012, Brochier et al 2013, Xu et al 2015, and California (Carr et al 2008, Fiechter et al 2015) Current upwelling ecosystems. It has also been used in the African part of the Canary Current upwelling ecosystem off Morocco (Brochier et al 2008b(Brochier et al , 2011 and Mauritania-Senegal (Mbaye et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Sardine (Sardina pilchardus) larval dispersal in the Iberian upwelling system, using coupled biophysical techniques

Santos

Nieblas

Verley

et al. 2018

Progress in Oceanography

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The European sardine (Sardina pilchardus) is the most important small pelagic fishery of the Western Iberia Upwelling Ecosystem (WIUE). Recently, recruitment of this species has declined due to changing environmental conditions. Furthermore, controversies exist regarding its population structure with barriers thought to exist between the Atlantic-Iberian Peninsula, Northern Africa, and the Mediterranean. Few studies have investigated the transport and dispersal of sardine eggs and larvae off Iberia and the subsequent impact on larval recruitment variability. Here, we examine these issues using a Regional Ocean Modeling System climatology (1989-2008) coupled to the Lagrangian transport model, Ichthyop. Using biological parameters from the literature, we conduct simulations that investigate the effects of spawning patchiness, diel vertical migration behaviors, and egg buoyancy on the transport and recruitment of virtual sardine ichthyoplankton on the continental shelf. We find that release area, release depth, and month of release all significantly affect recruitment. Patchiness has no effect and diel vertical migration causes slightly lower recruitment. Egg buoyancy effects are significant and act similarly to depth of release. As with other studies, we find that recruitment peaks vary by latitude, explained here by the seasonal variability of offshore transport. We find weak, continuous alongshore transport between release areas, though a large proportion of simulated ichthyoplankton transport north to the Cantabrian coast (up to 27%). We also show low level transport into Morocco (up to 1%) and the Mediterranean (up to 8%). The high proportion of local retention and low but consistent alongshore transport supports the idea of a series of metapopulations along this coast. Highlights ► Larval sardine retention is highest near the release site (self-recruitment) ► Release area, release depth, and month of release significantly affect recruitment. ► Retention and recruitment is very high in relation to other upwelling regions. ► Transport to Cantabrian up to 27%, Morocco up to 1% and Mediterranean up to 8% ► Results support the idea of a series of metapopulations along this region.

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“…The highest values are often detected on the seawater surface (Cabo, 1978). No relationships between seawater physicalchemical parameters and our conclusion were found, which can be explained due to: a) discrete data collected (e.g five seawater samples were collected in a column of 130 m) or b) upwelling and downwelling processes reported in this area (Parada et al, 2012) could give place to water mass exchange preventing to observe significant variations. (Fig.…”

Section: Discussionmentioning

confidence: 60%

Pore-water in marine sediments associated to gas hydrate dissociation offshore Lebu, Chile

Cárcamo

Vargas-Cordero

Fernandoy

et al. 2018

Preprint

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Abstract. Gas hydrate occurrences along the Chilean margin has been documented, but the processes associated to fluid escapes originated by gas hydrate dissociation yet are unknown. Here, we report morphologies growing related to fluid migration in the continental shelf offshore western Lebu (37 °S) by analysing mainly geochemical features. In this study oxygen and deuterium stable water isotopes in pore water were measured. Knowledge was completed by analysing bathymetric data, biological and sedimentological data. From bathymetric interpretation a positive relief at 127 m below sea level was recognised; it is oriented N55 °E and characterised by five peaks. Moreover, enrichment values for δ18O (from 0.0 to 1.8 ‰) and δD (from 0.0 to 5.6 ‰) were obtained. These are typical values related to hydrate melting during coring and post-sampling. The evident orientation of positive relief could be associated with faults and fractures reported by others authors, in which these structures constitute pathways for fluid migration from deep to shallow zones. Finally, benthic foraminifera observed in the core sample can be associated to seep areas. On the basis of theoretical modelling, we conclude that the positive relief correspond to mud growing processes related to gas hydrates dissociation and represent a key area to investigate fluid migration processes.

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Effects of seasonal variability in across- and alongshore transport of anchoveta (Engraulis ringens) larvae on model-based pre-recruitment indices off central Chile

Cited by 21 publications

References 47 publications

Modeling the spawning strategies and larval survival of the Brazilian sardine (Sardinella brasiliensis)

Modeling the spawning strategies and larval survival of the Brazilian sardine (Sardinella brasiliensis)

Sardine (Sardina pilchardus) larval dispersal in the Iberian upwelling system, using coupled biophysical techniques

Pore-water in marine sediments associated to gas hydrate dissociation offshore Lebu, Chile

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