Testing early life connectivity using otolith chemistry and particle-tracking simulations

Ashford, Julian
La Mesa, Mario
Fach Salihoğlu, Bettina Andrea
Jones, Christopher
Everson, Inigo
We measured the otolith chemistry of adult Scotia Sea icefish (Chaenocephalus aceratus), a species with a long pelagic larval phase, along the Antarctic Circumpolar Current (ACC) and compared the chemistry with simulated particle transport using a circulation model. Material laid down in otolith nuclei during early life showed (i) strong heterogeneity between the Antarctic Peninsula and South Georgia consistent with a population boundary, (ii) evidence of finer-scale heterogeneity between sampling areas on the Antarctic Peninsula, and (iii) similarity between the eastern and northern shelves of South Georgia, indicating a single, self-recruiting population there. Consistent with the otolith chemistry, simulations of the large-scale circulation predicted that particles released at depths of 100-300 m on the Antarctic Peninsula shelf during spring, corresponding to hatching of icefish larvae from benthic nests, are transported in the southern ACC, missing South Georgia but following trajectories along the southern Scotia Ridge instead. These results suggest that the timing of release and position of early life stages in the water column substantially influence the direction and extent of connectivity. Used in complement, the two techniques promise an innovative approach for generating and testing predictions to resolve early dispersal and connectivity of populations related to the physical circulation of oceanic systems.


Krill transport in the Scotia Sea and environs
Hofmann, Eileen E; Klinck, John M; Locarnini, Ricardo A; Fach Salihoğlu, Bettina Andrea; Murphy, Eugene (1998-12-01)
Historical observations of the large-scale flow and frontal structure of the Antarctic Circumpolar Current in the Scotia Sea region were combined with the wind-induced surface Ekman transport to produce a composite Bow field. This was used with a Lagrangian model to investigate transport of Antarctic krill. Particle displacements from known krill spawning areas that result from surface Ekman drift, a composite large-scale now, and the combination of the two were calculated Surface Ekman drift alone only tra...
Testing early life connectivity supplying a marine fishery around the Falkland Islands
Ashford, Julian R.; Fach Salihoğlu, Bettina Andrea; Arkhipkin, Alexander I.; Jones, Cynthia M. (2012-06-01)
We used a wind-driven global circulation model to build spatially explicit predictions from rival hypotheses concerning advective supply of Patagonian toothfish (Dissostichus eleginoides) to a trawl fishery around the Falkland Islands, and tested the predictions using chemistry recorded in the otoliths of fish caught in the fishery. Model simulations indicated transport pathways from spawning aggregations off southern Chile to both the north and south of the fishing area. In contrast, simulated particles re...
Modeling the influence of hydrodynamic processes on anchovy distribution and connectivity in the black sea Karadeniz'deki hamsi dağılımı ve bölgeler arası bağlantısı üzerine hidrodinamik proseslerin etkisinin modellenmesi
Fach Salihoğlu, Bettina Andrea (2014-01-01)
Dispersal mechanisms of Black Sea anchovy larvae (Engraulis encrasicolus ponticus) across the Black Sea were studied with an individual based anchovy larvae model embedded in a Lagrangian model using surface currents calculated from daily dynamic height topography maps of altimeter data during a period of three years (2001-2003). Particles representing anchovy eggs were released at different sites during June to August and their movement was tracked over time. Drifters were advected for 36 days, representin...
Measurement of anisotropic flow in XeXe collisions at 5.44 TeV with the CMS experiment
Stojanovic, Milan; et. al. (Elsevier BV, 2019-02-01)
New measurements of anisotropic flow in XeXe collisions at a center-of-mass energy of 5.44 TeV per nucleon pair, collected by the CMS experiment at the LHC, are presented. The v(2), v(3) and v(4) Fourier coefficients of the anisotropic azimuthal distribution are obtained employing three different analysis techniques: two-particle correlations, the scalar product method, and multiparticle cumulants, which have different sensitivities to non-flow and flow fluctuation effects. The results are shown as a functi...
Modeling studies of antarctic krill Euphausia superba survival during transport across the Scotia Sea
Fach Salihoğlu, Bettina Andrea; MURPHY, EUGENE (2002-01-01)
Antarctic krill Euphausia superba spawned on the outer continental shelf of the west Antarctic Peninsula can be entrained into the Southern Front of the Antarctic Circumpolar Current and transported across the Scotia Sea to South Georgia. A time-dependent, size-structured, physiologically based krill growth model was used to assess the food resources that are needed to sustain Antarctic krill during transport across the Scotia Sea and to allow them to grow to a size observed at South Georgia. Initial Lagran...
Citation Formats
J. Ashford, M. La Mesa, B. A. Fach Salihoğlu, C. Jones, and I. Everson, “Testing early life connectivity using otolith chemistry and particle-tracking simulations,” CANADIAN JOURNAL OF FISHERIES AND AQUATIC SCIENCES, pp. 1303–1315, 2010, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/30252.