SciELO - Scientific Electronic Library Online

 
vol.82 issue3Abiotic alterations caused by forest fragmentation affect tree regeneration: a shade and drought tolerance gradient in the remnants of Coastal Maulino ForestFuture directions of Chilean ecotoxicology: Implications for the environmental risk assessment of veterinary products used in aquaculture author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand

Journal

Article

Indicators

Related links

Share


Revista chilena de historia natural

Print version ISSN 0716-078X

Abstract

MOYA, CAROLINA et al. Spatial distribution patterns of benthic macroinvertebrates assemblages in an Andean Patagonian fluvial system. Rev. chil. hist. nat. [online]. 2009, vol.82, n.3, pp.425-442. ISSN 0716-078X.  http://dx.doi.org/10.4067/S0716-078X2009000300009.

In January of 2006 we studied the distributional patterns of benthic macroinvertebrate communities of the Baker river basin (45°50' O and 47°55' S) and their main controlling factors trying to cover the greater variety of the lotic ecosystems. To carry out the study, 27 sampling stations were located in the different sub basins of the river. In each station, physical-chemical parameters of the column of water were quantified (conductivity, dissolved oxygen, pH, temperature and turbidity), and documented characteristics of the segment (e.g. wide of the channel and sediment type) and cartographic information using a geographic information system (GIS) and complemented with cartographic information using GIS. Identified a total of 51 taxa, are mostly insect larvae (80 %). The groups most richness were orders Ephemeroptera (15 taxa), Plecoptera (8 taxa) and Trichoptera (8 taxa). The classification and ordination analyses carried out with the data of abundance, allowed to recognize seven groups stations (A-F) statistically significant (P < 0.05). The múltiple regression analysis, showed that the environmental variable that accounts for the observed biological patterns, was coverage cobble, explaining 45.1 % the variance of the biological data (r2 = 0.44 P < 0.05).

Keywords : Baker river basin; benthic macroinvertebrates; fluvial habitat; Froude number; Patagonian rivers.

        · abstract in Spanish     · text in Spanish     · Spanish ( pdf )

 

Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License