Saved in:
| Main Author: | |
|---|---|
| Format: | Artículo científico |
| Language: | en |
| Published: |
Sociedad Entomológica Argentina
2021
|
| Subjects: | |
| Online Access: | https://www.redalyc.org/articulo.oa?id=322065128008 https://www.redalyc.org/journal/3220/322065128008/ https://www.redalyc.org/journal/3220/322065128008/html/ https://www.redalyc.org/journal/3220/322065128008/322065128008.epub https://www.redalyc.org/journal/3220/322065128008/movil |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
Table of Contents:
- Presence of rainbow trout reduced drift of aquatic insects in Yungas streams (Tucumán, Argentina) Iris C. SERRA GREPPI Carlos MOLINERI Biología Drift Abundance Exotic trout Aquatic invertebrates The drift or transport of individuals downstream is an important phenomenon of rivers and streams, since most aquatic organisms participate in it at some period of their life cycle. This work describes the assemblage of macroinvertebrate drift from ten sites in eight mountain streams of Tucumán, and evaluates the effect of the presence of rainbow trout (Oncorhynchus mykiss Walbaum), an exotic fish and visual predator, on this fraction of the community. Thirty-one (31) families of drifting aquatic invertebrates were identified, mainly immature insects and to a lesser extent water mites (Acari: Hydrachnidia), oligochaetes (Annelida: Oligochaeta) and nematodes (Nematoda). The richness and diversity of the sites with trout did not differ from the others, except when comparing lower and upper reaches of a same stream. Samples from rivers without trout or with low density of trout did not show significant changes in drift density of macroinvertebrates. In contrast, in rivers with high trout densities, a notable decrease in insect taxa was observed (those with large sized individuals): Baetidae (Ephemeroptera), Gripopterygidae (Plecoptera) and Leptoceridae (Trichoptera). On the contrary, the density of small Diptera, water mites, oligochets and nematodes increased in trout-streams. 2021 artículo científico 1851-7471 https://www.redalyc.org/articulo.oa?id=322065128008 https://www.redalyc.org/journal/3220/322065128008/ https://www.redalyc.org/journal/3220/322065128008/html/ https://www.redalyc.org/journal/3220/322065128008/322065128008.epub https://www.redalyc.org/journal/3220/322065128008/movil en http://www.redalyc.org/revista.oa?id=3220 Revista de la Sociedad Entomológica Argentina application/pdf Sociedad Entomológica Argentina Revista de la Sociedad Entomológica Argentina (Argentina) Num.1 Vol.80