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PROCEEDINGS OF THE DESERT FISHES COUNCIL <br />HUIDOBRO C., L.*; ESPINOSA P., H. Instinno de Biologia, UNAM, Departamento de Biologia <br />Biogeography and systematics of the Poeciliopsis (Regan) <br />(Pisces: Poeciliidae) complex gracilis in Mexico <br />Biogeografia y Sistemdtica de Poeciliopsis (Regan) <br />(Pisces: Poeciliidae) Complejo gracilis en Mexico <br />KEYWORDS: Poeciliopsis; Grijalva-Usumacinta; Systematic; sistematica; Biogeography; biogeoWafia <br />1993 - VOLUME AXV <br />ABSTRACT <br />(POSTER PRESENTATION) The focus of this presentation is to demonstrate advances in the study of the <br />Poeciliopsis gracilis complex, and discuss systematics and biogeography of the group. The distribution of this <br />species is the Gri.jalva-Usamaeinta drainage in the southeast of Mexico. Comparisons with other species of the same <br />genus used as the outgroup complement the discussion of this important group. <br />RESUMEN <br />(PRESENTADO COMO CARTEL) El objetivo de este trabajo es mostrar los avances en el estudio del <br />complejo Poeciliopsis gracilis, discutiendose aspectos de la sistematica y biogeografia. La distribuci6n de esta <br />especie se localiza en el sistema Grijalva-Usamacinta, en el sureste de Mexico. Se realiza la comparaci6n con otras <br />especies del nlismo g6nero como grupos extemos que complementa la discust16n de este importante grupo. <br />ANDERSON, ALLISON A.*; HENDRICKSON, D.A. AAA - Depaament of Wildlife and Fisheries Sciences, Texaa A&M University, College Station, <br />TX 77843; DAII - Texas Memorial Museum, University of Texas at Actin, 2400 Trinity, Actin, TX 78705 <br />Geographic variation in morphology of spikedace, Meda fulgida, in Arizona and New Mexico <br />Variaci6n geogrnfica en la morfologia del "spikedace", Meda fulgida, en Arizona y Nuevo Mexico <br />KEYWORDS: spikedace; morphology; geographic variation; sexual dimorphism; Gila River; Arizona <br />CLAVES: spikedace; morfologia; variation geoWgfica; dimorfismo sexual; Rio Gila; Arizona <br />ABSTRACT <br />(POSTER PRESENTATION) Meda fidgida (Pisces: Cyprinidae) is a species endemic to the Gila River basin <br />of Arizona, Mexico, and New Mexico. The extent of morphological variation within this species has not been <br />explored although evidence indicates that subpopulations have long been isolated. We examined samples from the <br />four restricted areas within the Gila River basin where subpopulations persist, and used principal components <br />analysis, regression against PCI (to eliminate variation due to size), and ANOVA to demonstrate that individuals <br />from the Verde River (Arizona) have smaller mouths in proportion to pre-pelvic body measurements as compared <br />to individuals from Aravaipa Creek (Arizona). Subpopulations from New Mexico and Eagle Creek (Arizona) have <br />intermediate measurements. Additional analysis on the basis of sex confirms that females have shorter pre-pectoral <br />measurements, greater mid-body size, and shorter pectoral fins than do males. <br />RESUMEN <br />(PRESENTADO COMO CARTEL) Meda fulgida (Pisces: Cyprinidae) es una especie endetnica de la Cuenca <br />del Rio Gila de Arizona, Mexico y Nuevo Mexico. No se ha explorado como es ]a variation morfol6gica dentro <br />de esta especie, a pesar de que la evidencia indica que las subpoblaciones han estado bastante aisladas. Examinamos <br />muestras de cuatro areas restringidas dentro de ]a Cuenca del Rio Gila donde las subpoblaciones persisten, <br />utilizamos el analisis de componentes principales, regresi6n contra PCI (para elimmar la variation debida a la talla), <br />y analisis de varianza para demostrar que los individuos del Rio Verde, Arizona tienen bocas mas pequenas en <br />proporci6n a las medidas prepelvicas del cuerpo al ser comparados con individuos del Canon de Aravaipa (Arizona). <br />Las subpoblaciones de Nuevo Mexico y Canon del Aguila tienen dimensiones intermedias. Analisis adicionales, con <br />base en el sexo, confirman que las hembras poseen medidas pre-pectorales mas cortas, tally en la mitad del cuerpo <br />mas grande, y aletas pectorales mas cortas que los machos. <br />27