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Application of remote sensing to the study of the pelagic spiny lobster larval transport in the Tropical Atlantic

Abstracts

The connectivity of marine populations via larval dispersal is crucial for the maintenance of fisheries production and biodiversity. Because larval dispersion takes place on different spatial scales, global operational satellite data can be successfully used to investigate the connectivity of marine populations on different spatial and temporal scales. In fact, satellite data have long been used for the study of the large and mesoscale biological processes associated with ocean dynamics. This paper presents simulations of spiny lobster larvae transport in the Tropical Atlantic using the geostrophic currents, generated by altimetry that feeds an advection/diffusion model. Simulations were conducted over the Tropical Atlantic (20ºN to 15ºS), considering four larvae release areas: the Cape Verde Archipelago, the Ivory Coast, Ascension Island and Fernando de Noronha Archipelago. We used mean geostrophic current (MGC) calculated from 2001 to 2005 to represent the mean circulation of the Tropical Atlantic. We also ran the model for the El Niño geostrophic current regime (ENGC) using part of the MGC data, representing the El Niño 2002/2003 event. Results suggest that the intensification of the mesoscale ocean processes associated with El Niño events promotes the connectivity between populations, increasing the chances of a genetic flux among different stocks. We concluded that the altimetry geostrophic current data together with a relatively simple advection/diffusion model can provide useful information about the physical dynamics necessary to conduct studies on larval dispersion.

Satellite data; Altimetry; Larval transport; El Niño


A conectividade de populações marinhas através da dispersão larval é crucial para a manutenção da produção pesqueira e da biodiversidade. A dispersão de larvas ocorre em diferentes escalas espaciais e temporais, de forma que o recobrimento global e escala sinóptica fazem dos dados de satélite ferramentas importantes para esses estudos. O objetivo deste artigo é apresentar os resultados do uso de dados de correntes geostróficas derivadas de satélites altímetros para simular o transporte de larvas de lagosta espinhosa no oceano Atlântico Tropical. As simulações foram realizadas ao longo do Atlântico Tropical (20ºN - 15ºS), iniciando em quatro locais (Cabo Verde, Costa do Marfim, Ilha de Ascensão e Arquipélago de Fernando de Noronha). Foi utilizado um modelo advectivo/difusivo forçado com o campo médio de circulação geostrófica calculado entre 2001 e 2005 e outro forçado com campo correspondente ao evento de El Niño 2002/2003. Os resultados obtidos sugerem que há uma intensificação de processos oceânicos de meso-escala durante o ano de El Niño, que promove a conectividade entre diferentes estoques e aumenta as chances de ocorrer um fluxo genético. Os dados de correntes geostróficas gerados a partir de satélites altímetros incorporados a um modelo advectivo/difusivo simples podem prover informações importantes acerca da dinâmica física necessárias para conduzir estudos sobre dispersão larval.

Dados de satélite; Altimetria; Transporte de larvas; El Niño


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Publication Dates

  • Publication in this collection
    22 Apr 2009
  • Date of issue
    Mar 2009

History

  • Accepted
    11 Sept 2008
  • Reviewed
    16 Apr 2008
  • Received
    23 Nov 2007
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