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Marine and Freshwater Research Marine and Freshwater Research Society
Advances in the aquatic sciences
RESEARCH ARTICLE

Species and genus richness and assemblage composition of stream caddisflies (Insecta: Trichoptera) vary with latitude in mountain rainforest of Argentina

Edgardo J. I. Pero https://orcid.org/0000-0002-6335-8654 A B , Paola A. Rueda Martín A and María C. Reynaga A
+ Author Affiliations
- Author Affiliations

A Instituto de Biodiversidad Neotropical, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Facultad de Ciencias Naturales e Instituto Miguel Lillo, Universidad Nacional de Tucumán, Horco Molle s/n, Ciudad Universitaria, Yerba Buena, CP4107 Tucumán, Argentina.

B Corresponding author. Email: peroedgardo@gmail.com

Marine and Freshwater Research 70(5) 687-697 https://doi.org/10.1071/MF18209
Submitted: 30 May 2018  Accepted: 11 October 2018   Published: 7 December 2018

Abstract

Evidence found in results of studies of latitudinal gradients of benthic macroinvertebrate diversity is variable. This study analysed how species and genus richness and the composition of caddisfly assemblages (Insecta: Trichoptera) vary in Argentinean mountain forest through a latitudinal gradient from 22 to 28°S. Qualitative and quantitative data from 20 stream sites were compared. Assemblage richness and composition were analysed by comparing linear regressions, rank–abundance (RA) curves and non-metric multidimensional scaling (nMDS). Taxonomic richness increased from high to low latitude. RA curves showed changes in assemblage composition and structure across the latitudinal gradient. The nMDS revealed that the composition of the assemblages also changed along the latitudinal gradient. The patterns are similar to those observed in plants and vertebrates from the study region. The results are of particular note because a latitudinal gradient of aquatic insect diversity has rarely been observed in a narrow range.

Additional keywords: aquatic insects, protected areas, Yungas forest.


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