Flux of Larval Fishes Across Frontal Boundaries: Examples from the Mississippi River Plume Front and the Western Gulf Stream Front in Winter
Abstract:Boundaries between water masses, frontal zones, are neither static nor impervious: they are dynamic. There is exchange of water across frontal zones and, as a consequence, there is flux of biota. The spatial distribution of larval gulf and Atlantic menhaden (Brevoortia patronus and B. tyrannus), and spot (Leiostomus xanthurus), presumed indicators of larval fish assemblages in and about two well defined, but vastly different frontal zones, serve as examples of the flux of larval fishes across water-mass boundaries. Across the Mississippi River plume front in the Gulf of Mexico and the western Gulf Stream front in the southeastern Atlantic bight of the United States, mixing and stirring can account for flux of larval fishes. The consequences of flux for the larvae of these indicator species is their shoreward transport, or the reciprocal, their expatriation from coastal populations.
Document Type: Research Article
Publication date: September 1, 1993
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