Diferencias geográficas en la forma del caparazón del cangrejo Cyrtograpsus affinis (Decapoda: Varunidae) y sus implicaciones taxonómicas
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https://doi.org/10.3989/scimar.03391.16APalabras clave:
Cyrtograpsus altimanus, alometría, morfometría geométrica, estuario del Río de la Plata, golfo Nuevo, adaptaciones locales, hábitats contrastantesResumen
El género Cyrtograpsus fue tradicionalmente considerado como formado por tres especies: C. angulatus, C. altimanus y C. affinis. Trabajos recientes reportan sólida evidencia que sugiere que C. altimanus y C. affinis pertenecen a una única especie y proponen que las formas que originaron esta clasificación errónea pueden corresponderse con diferentes ecofenotipos o estadios sucesivos del ciclo de vida de una misma especie. Este trabajo presenta un estudio de morfometría geométrica sobre la forma del caparazón de especímenes del género Cyrtograpsus provenientes del estuario del Río de la Plata (36°S) y del golfo Nuevo (42.75°S), en el que se prueban las diferencias en la forma del caparazón relativas al tamaño (alometría) y a los distintos ambientes. Nuestros resultados muestran que las descripciones morfológicas previas de ambas especies están asociadas a diferentes regiones de una variación alométrica continua y estadísticamente significativa, y nos permite concluir que C. affinis es un sinónimo juvenil de C. altimanus. Además encontramos diferencias significativas en la forma del caparazón entre especímenes provenientes del ambiente estuárico y el marino, lo cual sugiere un efecto de ciertas variables ambientales sobre la forma del caparazón y un potencial valor adaptativo de esta característica.
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