The effects of a tidal-mixing front on the distribution of larval fish habitats in a semi-enclosed sea during winter

Emilio A. Inda-Díaz, Laura Sánchez-Velasco, Miguel F. Lavín

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

We examined the effect of a tidal-mixing front on the three-dimensional distribution of larval fish habitats (LFHs) in the Midriff Archipelago Region in the Gulf of California during winter. Zooplankton and environmental variables were sampled from 0 to 200 m in 50 m strata. Four LFHs were defined in association with the front, two on the northern side and two on the southern side. The northern LFHs were: (1) the Mainland Shelf Habitat, located from the surface to 100 m depth on the north-east mainland shelf, characterized mainly by the presence of Citharichtys fragilis; and (2) the Wide Distribution Habitat, extending from north-west to south across the front from the surface to 200 m depth, dominated by the ubiquitous Engraulis mordax. The southern LFHs were: (3) the Eddy Zone Habitat, defined nearly on an anticyclonic eddy, with the highest larval abundance and richness from the surface to 100 m depth, dominated by Leuroglossus stilbius; and (4) the Southern Gulf Habitat, associated with low temperature waters from the southern Gulf of California, dominated by southern-gulf species (e.g. Scomber japonicus and Sardinops sagax). Despite the weak stratification and low thermal contrast (∼1.5°C) across the south front compared to summer (∼3°C), our results demonstrate that the frontal zone may influence the formation of planktonic habitats even during generally homogeneous periods, which may also be relevant in other regions of the world.

Original languageEnglish
Pages (from-to)1517-1530
Number of pages14
JournalJournal of the Marine Biological Association of the United Kingdom
Volume94
Issue number7
DOIs
StatePublished - 14 Nov 2014
Externally publishedYes

Keywords

  • Gulf of California
  • Mexico
  • anticyclonic eddy
  • larval fish habitat
  • mesoscale oceanographic processes
  • three-dimensional distribution
  • tidal front

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