Modelling giant red shrimp larval dispersal in the Sardinian seas: density and connectivity scenarios

Palmas, F.; Olita, Antonio; Addis, Piero; Sorgente, Roberto; Sabatini, Andrea

doi:10.1111/fog.12199

Cited by 20 publications

(12 citation statements)

References 59 publications

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“…Two hydrodynamic models allowed testing the sensibility of particle dispersals to the Mediterranean Sea thermohaline circulation. The dispersal rates were low and similar to observations or simulations of deep drifters from other marine ecosystems (Palmas et al, 2017;Corell et al, 2012).…”

Section: Discussionsupporting

confidence: 80%

“…Particle dispersal was simulated with the open-source IBM code Ichthyop (Lett et al, 2008) version 3.3, which is a free userfriendly toolset used in numerous individual dispersal studies in the western Mediterranean Sea (Ospina-Álvarez et al, 2013;Palmas et al, 2017). Displacements of virtual particles are computed by integrating the differential equation using a Runge-Kutta 4th order (RK4) advection scheme:…”

Section: Biophysical Modelmentioning

confidence: 99%

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Influence of the summer deep-sea circulations on passive drifts among the submarine canyons in the northwestern Mediterranean Sea

Clavel-Henry¹,

Solé²,

Ahumada-Sempoal³

et al. 2019

Preprint

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Abstract. Marine biophysical models can be used to explore the displacement of individuals in and between submarine canyons. Mostly, the studies focus on the shallow hydrodynamics in or around a single canyon. In the northwestern Mediterranean Sea, the knowledge on the deep-sea circulation and its spatial variability in three contiguous submarine canyons is limited. We used a Lagrangian framework with three-dimensional velocity fields from two hydrodynamics models to study the deep bottom connectivity between submarine canyons and to compare their influences on the particle transport. The particles represented eggs and larvae spawned by the deep-sea commercial shrimp Aristeus antennatus along the continental slope in summer. The passive particles mainly followed a southwest drift along the slope and drifted less than 200 km within 31 days. Two of the sub-marine canyons were connected by more than 27 % particles if they were released at sea bottom depths above 600 m. The vertical displacement of particles was depending on the submarine canyons, the depth and the can-yon wall where particles were released and it encouraged the analyses of the particle transport by canyons in-stead of generalizing the dynamics. In the two hydrodynamic models tested in this study, passive drift simulation differed depending on topography. Despite being run on a coarser grid, the hydrodynamic model using finer bathymetric resolution data and adjusted to the topography seemed to better model the passive drift of particles. Those results promote that the physical model parameterization has to be considered for improving the transport studies of deep-sea species.

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Section: Discussionsupporting

confidence: 80%

Section: Biophysical Modelmentioning

confidence: 99%

Influence of the summer deep-sea circulations on passive drifts among the submarine canyons in the northwestern Mediterranean Sea

Clavel-Henry¹,

Solé²,

Ahumada-Sempoal³

et al. 2019

Preprint

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show abstract

“…In the recommendation guide for IBMs by [51], buoyancy is a key parameter for explaining the changes in the larval drifts. However, prior to our study in the Mediterranean Sea, only [15] studied the impact of egg buoyancy on simulated drifts for the deep-sea shrimp Aristaeomorpha foliacea (taxonomically close to A. antennatus), using Atlantic anchovy egg density [52].…”

Section: Importance Of Buoyant Phasesmentioning

confidence: 99%

“…Buoyancy adjusts the vertical egg position in the water column by the difference between egg and water densities [14][15][16]. To date, because either some deep-sea species are gravid (i.e., eggs carried by the spawners) or egg information is unavailable, larval dispersal of deep-sea species rarely accounted for the simulation of the stages that interact with the water density.…”

Section: Introductionmentioning

confidence: 99%

Modeled buoyancy of eggs and larvae of the deep-sea shrimp Aristeus antennatus (Crustacea: Decapoda) in the northwestern Mediterranean Sea

et al. 2020

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Information on the buoyancy of eggs and larvae from deep-sea species is rare but necessary for explaining the position of non-swimming larvae in the water column. Due to embryonic morphology and ecology diversities, egg buoyancy has important variations within one species and among other ones. Nevertheless, it has hardly been explored if this buoyancy variability can be a strategy for deep-sea larvae to optimize their transport beyond their spawning areas. In the northwestern Mediterranean Sea, protozoea and mysis larvae of the commercial deep-sea shrimp Aristeus antennatus were recently found in upper layers, but to present, earlier stages like eggs and nauplii have not been collected. Using a Lagrangian transport model and larval characteristics, we evaluate the buoyancy and hydrodynamic effects on the transport of A. antennatus' larvae in the northwestern Mediterranean Sea. The transport models suggested that 75% of buoyant eggs released between 500 and 800 m depth (i.e., known spawning area), reached the upper water layers (0-75 m depth). Then, according to the modeled larval drifts, three spawning regions were defined in the studied area: 1) the northern part, along a continental margin crossed by large submarine canyons; 2) the central part, with two circular circulation structures (i.e., eddies); and 3) the southern part, with currents flowing through a channel. The number of larvae in the most upper layer (0-5 m depth) was higher if the larval transport model accounted for the ascent of eggs and nauplii (81%) instead of eggs reaching the surface before hatching (50%). The larvae reaching the most water upper layer (0-5 m depth) had higher rates of dispersal than the ones transported below the surface layer (deeper than 5 m depth). The results of larval dispersal simulations have implications for the understanding of A. antennatus larval ecology and for management decisions related to the shrimp fisheries in the northwestern Mediterranean Sea.

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“…where dX is the three-dimensional displacement vector of the particles during a time step dt of 30 min under the veloc-ity vector U from the hydrodynamic models. RK4 is a stable and reliable multistep method for numerical integration (North et al, 2009;Qiu et al, 2011) and is commonly used in Lagrangian dispersal models (North et al, 2009;Chen et al, 2003;Paris et al, 2013). The Ichthyop algorithm used trilinear and linear interpolations in space and time from the daily average ROMS velocity field output to each particle position at all time steps.…”

Section: Biophysical Modelmentioning

confidence: 99%

Influence of the summer deep-sea circulations on passive drifts among the submarine canyons in the northwestern Mediterranean Sea

et al. 2019

View full text Add to dashboard Cite

Abstract. Marine biophysical models can be used to explore the displacement of individuals in and between submarine canyons. Mostly, the studies focus on the shallow hydrodynamics in or around a single canyon. In the northwestern Mediterranean Sea, knowledge of the deep-sea circulation and its spatial variability in three contiguous submarine canyons is limited. We used a Lagrangian framework with three-dimensional velocity fields from two versions of the Regional Ocean Modeling System (ROMS) to study the deep-bottom connectivity between submarine canyons and to compare their influence on the particle transport. From a biological point of view, the particles represented eggs and larvae spawned by the deep-sea commercial shrimp Aristeus antennatus along the continental slope in summer. The passive particles mainly followed a southwest drift along the continental slope and drifted less than 200 km considering a pelagic larval duration (PLD) of 31 d. Two of the submarine canyons were connected by more than 27 % of particles if they were released at sea bottom depths above 600 m. The vertical advection of particles depended on the depth where particles were released and the circulation influenced by the morphology of each submarine canyon. Therefore, the impact of contiguous submarine canyons on particle transport should be studied on a case-by-case basis and not be generalized. Because the flows were strongly influenced by the bottom topography, the hydrodynamic model with finer bathymetric resolution data, a less smoothed bottom topography, and finer sigma-layer resolution near the bottom should give more accurate simulations of near-bottom passive drift. Those results propose that the physical model parameterization and discretization have to be considered for improving connectivity studies of deep-sea species.

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Modelling giant red shrimp larval dispersal in the Sardinian seas: density and connectivity scenarios

Cited by 20 publications

References 59 publications

Influence of the summer deep-sea circulations on passive drifts among the submarine canyons in the northwestern Mediterranean Sea

Influence of the summer deep-sea circulations on passive drifts among the submarine canyons in the northwestern Mediterranean Sea

Modeled buoyancy of eggs and larvae of the deep-sea shrimp Aristeus antennatus (Crustacea: Decapoda) in the northwestern Mediterranean Sea

Influence of the summer deep-sea circulations on passive drifts among the submarine canyons in the northwestern Mediterranean Sea

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