Resumen

BARBOSA-SALDANA, María de Lourdes; DIAZ-JAIMES, Píndaro  y  URIBE-ALCOCER, Manuel. Morphological variation of brown shrimp (Farfantepenaeus californiensis) in Mexican Pacific. Rev. Mex. Biodiv. [online]. 2012, vol.83, n.1, pp.42-50. ISSN 2007-8706.

Multivariate analyses of morphometric data have been widely used to define independent fishing units for exploited species. In this study we analyzed the morphometric variability of 4 brown shrimp Farfantepenaeus californiensis (Holmes, 1900) locations from the Mexican Pacific to assess whether differentiation agrees with the geographical subdivision established by the Instituto Nacional de la Pesca to monitoring the brown shrimp populations. The morphologic variation of each sample was estimated through the variation coefficient (CV%) averaged over 18 measurements. A discriminant analysis was made using the standardized ratios for some of the measurements. Manhattan distances among samples were calculated to obtain a dendrogram with the UPGMA method where localities grouping showed a clinal pattern of morphological differentiation related to a geographical gradient. The low estimated morphologic variability within samples allowed us to conclude that each sampled locality conforms a phenotypically homogeneous group, with clear differences to the others. These differences could be explained on basis of the environmental characteristics of each locality in addition to possible genetic variations between populations. Thus, the morphological differentiation of the brown shrimp populations of the Mexican Pacific detected in this study provides additional elements to sustain the geographical division that the Instituto Nacional de la Pesca established to survey the shrimp fishery.

Palabras llave : stock; fisheries; population subdivision; discriminant analysis; geographic zones; clinal variation; cephalotorax; abdominal segment.

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