Evaluación experimental del efecto de dos grupos de macroinvertebrados (anfípodos y gasterópodos) sobre algas epífitas

Authors

  • Adonis Giorgi Programa de Investigaciones en Ecología Acuática (PISA)- Departamento de Ciencias Básicas- Universidad Nacional de Luján. C. C. 221- 6700- Luján.
  • Beatríz Tiraboschi Programa de Investigaciones en Ecología Acuática (PISA)- Departamento de Ciencias Básicas- Universidad Nacional de Luján. C. C. 221- 6700- Luján.

Abstract

Relationships between the most important invertebrates to epiphytes algae on submerged aquatic plants were analized. All experiments were carried out at 25 oC (±1 oC) and at the natural chemical condition of Las Flores stream (Luján River Basin). The results show that the amphipods (Hyalella sp) and the gasteropods (Littoridina piscium and Uncancylus concentricus bonariensis) eat the epiphitic algae of the submerged plant, Egeria densa. These algae are the principal food provision of amphipods. On other way, gastropods food are sedimentated or benthic algae. The ingestion rate point out that amphipods and gastropods prefer differents types of algae. The ingestion rates related to nutrient concentration suggests that amphipods and gastropods enhance the growth of the macrophyte Egeria densa by the reduction of the epiphytes and the addition of nutrients. The major contribution of ammonia and phosphate available by algae are produced by amphipods. These results state that trophic interactions influence epiphitic algae growth and phosphorus and nitrogen recyling in small water bodies as plain stream.

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Published

1999-06-01

How to Cite

Giorgi, A., & Tiraboschi, B. (1999). Evaluación experimental del efecto de dos grupos de macroinvertebrados (anfípodos y gasterópodos) sobre algas epífitas. Ecología Austral, 9(1), 035–044. Retrieved from https://ojs.ecologiaaustral.com.ar/index.php/Ecologia_Austral/article/view/1608

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Vol. 9 No. 1 (1999)

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