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Sexual size dimorphism, sex ratio and the relationship between seasonality and water quality in four species of Gordiida (Nematomorpha) from Catamarca, Argentina

Published online by Cambridge University Press:  08 October 2010

L. Salas ,
C. De Villalobos  and
F. Zanca
L. Salas
Affiliation:
Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Catamarca, Avenida Belgrano 300, CP 4700San Fernando del Valle de Catamarca, Argentina
C. De Villalobos*
Affiliation:
Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata, Paseo del Bosque S/N 1900, Argentina Comisión de Investigaciones Científicas de la Provincia de Buenos Aires 526 entre 10 y 11 1900, La Plata, Argentina
F. Zanca
Affiliation:
Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata, Paseo del Bosque S/N 1900, Argentina Consejo Nacional de Investigaciones Científicas y Tecnológicas, Avenida Rivadavia 1917, Ciudad de Buenos Aires, Argentina
*
*E-mail: villalo@fcnym.unlp.edu.ar
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Abstract

A total of 687 adult nematomorphs of four species of Gordiida: Chordodes brasiliensis (393 specimens), Noteochorododes cymatium (47 specimens), N. talensis (162 specimens) and Pseudochordodes dugesi (85 specimens) were collected during a period of 1 year from El Simbolar stream, Argentina. Free-living worms were abundant during autumn and spring, but their number decreased during winter and summer. Males were shorter and significantly more abundant than females. The presence of N. cymatium, N. talensis and P. dugesi was correlated with water temperature and these species were most abundant in winter and spring. The presence of C. brasiliensis was correlated with flow rate and pH; this species was more abundant in autumn and winter. These four species are sympatric.

Type
Research Papers
Information
Journal of Helminthology , Volume 85 , Issue 3 , September 2011 , pp. 319 - 324
Copyright
Copyright © Cambridge University Press 2010

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