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Otolith shape analysis as a tool for population discrimination of the white grunt (Haemulon plumieri) stock in the northern coast of the Yucatan Peninsula, Mexico

2012; National University, Costa Rica; Volume: 4; Issue: 1 Linguagem: Espanhol

1659-455X

Christina Treinen-Crespo, Harold Villegas‐Hernández, Sergio Guillén-Hernández, Miguel-Ángel Ruíz-Zárate, Carlos González Salas,

Cephalopods and Marine Biology

In this study, the population structure of the white grunt (Haemulon plumieri) from the northern coast of the Yucatan Peninsula was determined through an otolith shape analysis based on the samples collected in three locations: Celestun (N 20°49’,W 90°25’), Dzilam (N 21°23’, W 88°54’) and Cancun (N 21°21’,W 86°52’). The otolith outline was based on the elliptic Fourier descriptors, which indicated that the H. plumieri population in the northern coast of the Yucatan Peninsula is composed of three geographically delimited units (Celestun, Dzilam, and Cancun). Significant differences were observed in mean otolith shapes among all samples (PERMANOVA; F2, 99 = 11.20, P = 0.0002), and the subsequent pairwise comparisons showed that all samples were significantly differently from each other. Samples do not belong to a unique white grunt population, and results suggest that they might represent a structured population along the northern coast of the Yucatan Peninsula. En este estudio, la estructura de la poblacion del ronco blanco (Haemulon plumieri) de la costa norte de la Peninsula de Yucatan fue determinada a traves del analisis de la forma del otolito, sobre la base de las muestras recolectadas en tres localidades: Celestun (N 20°49’, W 90°25’), Dzilam (N 21°23’, W 88°54’) y Cancun (N 21° 21’, O 86° 52’). El analisis del contorno de los otolitos se baso en los descriptores elipticos de Fourier, cuyo enfoque indico que la poblacion de H. plumieri en la costa norte de la Peninsula de Yucatan se compone al menos de tres unidades delimitadas geograficamente (Celestun, Dzilam y Cancun). Se observaron diferencias significativas en la forma del otolito entre todas las muestras (PERMANOVA, F2, 99 = 11.20, P = 0.0002) y las comparaciones por pares posteriores indicaron que todas las muestras fueron significativamente diferentes una de otra. Al parecer, las muestras no pertenecen a una unica poblacion, y los resultados sugieren que podria representar una poblacion bien estructurada a lo largo de la costa norte de la Peninsula de Yucatan.