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JPR Advance Access published online on May 4, 2004
Journal of Plankton Research, doi:10.1093/plankt/fbh091
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Received January 9, 2003
Accepted March 8, 2004

Article

Distribution and abundance of hyperiid amphipods in relation to summer mesoscale features in the southern Gulf of Mexico

Rebeca Gasca 1*

1 El Colegio de la Frontera Sur (ECOSUR). Unidad Chetumal, Carr. Chetumal-Calderitas Km 5.5, Apdo. Postal 424, C.P. 77000, Chetumal, Q. Roo, México. Research Associate, National Museum of Natural History, Smithsonian Institution, Washington, D.C., U.S.A.

* To whom correspondence should be addressed. E-mail: rgasca{at}ecosur-qroo.mx.


  Abstract

Seventy-one hyperiid species were identified from 97 zooplankton samples collected in the southern Gulf of Mexico during July 1988. About 91% of the adult individuals belonged to five species: Lestrigonus bengalensis (86.56 % of total hyperiid numbers), Anchylomera blossevillei (1.20 %), and Phronimopsis spinifera (1.05 %), Hyperioides longipes (1.00 %) and -Hyperietta vosseleri (0.99 %). Overall, up to 74% of the hyperiids were collected at night although a reverse migration was observed in the anticyclones. The mean abundance was five-fold higher at the neritic stations than in the oceanic areas. This tendency was even more marked at night. Night samples yielded about the same number of species as at daytime (56 taxa vs 61). Four mesoscale features (two anticyclones, one cyclone, and one upwelling) characterized the oceanic mesoscale circulation in the surveyed area. The abundance of the oceanic hyperiid community showed significant differences related to some of the mesoscale features active in the area, i.e. the abundance in the Lazy Eddy anticyclone was lower than that in the cyclone (day and night); overall, the upwelling areas showed a tendency to have higher abundances than the downwelling features (anticyclones). Cluster analysis indicated neritic-oceanic differences rather than mesoscale feature-related differences in the local hyperiid community. The neritic community showed differences that were attributed to the effect of upwelling. The summer and spring hyperiid communities had important differences in the same area thus suggesting a seasonal succession of the gulf hyperiid community.


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R. Gasca, H. Manzanilla, and E. Suarez-Morales
Distribution of hyperiid amphipods (Crustacea) of the southern Gulf of Mexico, summer and winter, 1991
J. Plankton Res., December 1, 2009; 31(12): 1493 - 1504.
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