The Trophic relationships in the Water System of the Province of Rivers: Ichthyoelephas humeralis and Brycon alburnus

Authors

  • Mónica Prado España Biologist, Thesis for the Master's Degree in Sciences with an Emphasis on Sustainable Management of Bioaquatic Resources and the Environment , Bióloga, Tesis de Grado para la obtención del Título de Magíster en Ciencias con Énfasis en Manejo Sustentable de Recursos Bioacuáticos y el Medio Ambiente https://orcid.org/0000-0002-2017-8784 (unauthenticated)
  • Luís Muñíz Vidarte Master in Curriculum Design by Competence, Biologist, Thesis Director, University of Guayaquil, Faculty of Natural Sciences , Magister en Diseño Curricular por competencia, Biólogo, Director Tesis, Universidad de Guayaquil, Facultad de Ciencias Naturales

DOI:

https://doi.org/10.53591/cna.v6i1.198

Keywords:

trophic relationships, Ichthyoelephas humeralis, Brycon alburnus, detritivorous, phytophagous, omnivorous

Abstract

The stomach contents of 245 specimen Ichthyoelephas humeralis and 230 of Brycon alburnus were analyzed for determination of feeding habits and trophic relationships in Los Rios province hydric system, between march and december, 2010. The Relative importance index was used, based in the numeric method, weight and occurrence frequency, also obtaining trophic niche breadth index of Levin and overlapping index of Morisita. I. humeralis was determinated as a detritivorousphytophagous
fish, feeding from 7 food groups, being the most important of them the detritus and microalgae. B. alburnus was determinated as an omnivorous fish; the predominant food components were mixed plant material, fish and insects. The trophic niche breadth determinated to I. humeralis (Bi=0.06) and B. alburnus (Bi=0.09) as selective predators, feeding of a
higher percentage of few species. Comparing both species by trophic overlapping index, a middle overlapping (Cλ 0.47) was obtained, and indicated that both species share the same space because they feed some similar preys but in different proportions.

Author Biographies

  • Mónica Prado España, Biologist, Thesis for the Master's Degree in Sciences with an Emphasis on Sustainable Management of Bioaquatic Resources and the Environment, Bióloga, Tesis de Grado para la obtención del Título de Magíster en Ciencias con Énfasis en Manejo Sustentable de Recursos Bioacuáticos y el Medio Ambiente

    National Institute of Fisheries: Guayaquil, Guayas, EC
    1993-03-01 to present | Head of Plankton Laboratory (Research on Bioaquatic Resources and their Environment)
    Employment

    University of Guayaquil: Guayaquil, Guayas, EC
    2009-04-01 to 2012-12-01 | M. Sc. (Faculty of Natural Sciences)
    Education

    University of Guayaquil: Guayaquil, Guayas, EC
    1987-04-01 to 1992-06-15 | Biologist (Faculty of Natural Sciences)
    Education

  • Luís Muñíz Vidarte, Master in Curriculum Design by Competence, Biologist, Thesis Director, University of Guayaquil, Faculty of Natural Sciences, Magister en Diseño Curricular por competencia, Biólogo, Director Tesis, Universidad de Guayaquil, Facultad de Ciencias Naturales

    Master in Curriculum Design by Competence, Biologist, Thesis Director, University of Guayaquil, Faculty of Natural Sciences

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Published

2012-11-23

Issue

Vol. 6 No. 1 (2012): Scientific Journal of Natural and Environmental Sciences

Section

Artículos

License

Esta obra está bajo una licencia Creative Commons: No comercial-Sin Derivadas- 4.0. Los autores mantienen los derechos sobre los artículos y por lo tanto son libres de compartir, copiar, distribuir, ejecutar y comunicar públicamente la obra. 

How to Cite

The Trophic relationships in the Water System of the Province of Rivers: Ichthyoelephas humeralis and Brycon alburnus. (2012). Revista Científica Ciencias Naturales Y Ambientales, 6(1). https://doi.org/10.53591/cna.v6i1.198