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1 November 2012 Population Abundance and Sex Ratio of the Viviparous Freshwater Fish Poeciliopsis baenschi (Poeciliidae) Throughout its Range in Western Mexico
J. Jaime Zúñiga-Vega, Ana L. Hernández-Rosas, Alejandro Molina-Moctezuma, Hibraim A. Pérez-Mendoza, Fernanda R. Rodríguez-Reyes, Yolotzin M. Bravo-Espinosa, Héctor Espinosa-Pérez
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Abstract

We estimated population abundance and sex ratio for a freshwater live-bearing fish species (Poeciliopsis baenschi) that inhabits fluvial systems in western Mexico. We conducted mark-recapture experiments in 6 distinct populations. We used both our catch data as well as estimates of capture probability to calculate the number of individuals per unit water volume for adult males, adult females, and juveniles. Overall, abundance varied among sites from 23.8 individuals · m-3 to 363.2 individuals · m-3. In most of our study sites, the estimated sex ratio was markedly biased toward females (up to 11 females per male). We discuss the potential causes and implications of the observed demographic features.

J. Jaime Zúñiga-Vega, Ana L. Hernández-Rosas, Alejandro Molina-Moctezuma, Hibraim A. Pérez-Mendoza, Fernanda R. Rodríguez-Reyes, Yolotzin M. Bravo-Espinosa, and Héctor Espinosa-Pérez "Population Abundance and Sex Ratio of the Viviparous Freshwater Fish Poeciliopsis baenschi (Poeciliidae) Throughout its Range in Western Mexico," Western North American Naturalist 72(3), 357-368, (1 November 2012). https://doi.org/10.3398/064.072.0310
Received: 29 February 2012; Accepted: 4 May 2012; Published: 1 November 2012
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