Sardine ( Sardina pilchardus ) larval dispersal in the Iberian Upwelling System, using coupled biophysical techniques

Type Article
Date 2018-03
Language English
Author(s) Santos Amp1, 2, Nieblas Anne-Elise4, 8, Verley P.5, Teles-Machado A.4, Bonhommeau SylvainORCID6, Lett C.7, Garrido S.1, 3, Peliz A.4
Affiliation(s) 1 : IPMA, Rua Alfredo Magalhaes Ramalho 6, P-1449006 Lisbon, Portugal.
2 : Univ Algarve, CCMAR Ctr Ciencias Mar, Rua Alfredo Magalhaes Ramalho 6, P-1449006 Lisbon, Portugal.
3 : MARE, Rua Alfredo Magalhaes Ramalho 6, P-1449006 Lisbon, Portugal.
4 : Univ Lisbon, Fac Ciencias, IDL, P-1749016 Lisbon, Portugal.
5 : Univ Montpellier, INRA, CNRS, AMAP,IRD,CIRAD, Montpellier, France.
6 : CRHMT, Inst Francais Rech Exploitat Mer IFREMER, F-34203 Sete, France.
7 : CRHMT, UMMISCO, UPMC, UMI,IRD 209, Ave Jean Monnet,BP 171, F-34203 Sete, France.
8 : CAP RUN Hydro Reunion, Magasin 10, F-97420 Le Port, Ile De La Reuni, France.
Source Progress In Oceanography (0079-6611) (Pergamon-elsevier Science Ltd), 2018-03 , Vol. 162 , P. 83-97
DOI 10.1016/j.pocean.2018.02.011
WOS© Times Cited 8
Keyword(s) Iberian Peninsula, Sardina pilchardus, Larval dispersal, Lagrangian transport, Ichthyop, Regional Ocean Modeling System
Abstract

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.

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