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Spatial and temporal variation of stream communities in a human-affected tropical watershed

Published online by Cambridge University Press:  16 August 2010

Ronald Sánchez-Argüello ,
Aydeé Cornejo ,
Richard G. Pearson  and
Luz Boyero
Ronald Sánchez-Argüello*
Affiliation:
Ministerio Nacional del Ambiente, Energía y Telecomunicaciones, Área de Conservación Tortuguero, Costa Rica Brazil
Aydeé Cornejo
Affiliation:
Programa Centroamericano de Maestría en Entomología, Vicerrectoría de Investigación y Postgrado, Universidad de Panamá, Panama Brazil Sección de Entomología, Instituto Conmemorativo Gorgas de Estudios de la Salud, Ave. Justo Arosemena & Calle 35, 0816-02593 Panamá, Panama
Richard G. Pearson
Affiliation:
School of Marine and Tropical Biology, James Cook University, Townsville, QLD 4811, Australia
Luz Boyero
Affiliation:
School of Marine and Tropical Biology, James Cook University, Townsville, QLD 4811, Australia Wetland Ecology Group, Doñana Biological Station-CSIC, Avda Américo Vespucio s/n, E-41092 Sevilla, Spain
*
*Corresponding author: [email protected]
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Abstract

We explored the spatial and temporal variability of benthic macroinvertebrate communities (density, taxon richness, evenness and taxonomic composition) in a tropical Panamanian stream that is potentially affected by organic and chemical pollution resulting from human activities. As predicted, pristine headwaters of Site 1, located within the Altos de Campana National Park, showed the lowest macroinvertebrate densities, suggesting an increase in pollution-tolerant taxa at downstream sites located near human settlements and agricultural land. Moreover, Site 1 had higher accumulated taxon richness than downstream sites (except Site 5), although evenness was higher at Site 3. Density and taxon richness were higher and more variable in the dry season, while evenness was only higher in the dry season at Site 1. Multivariate analysis showed that the fauna responded to a natural longitudinal gradient, but there was also a strong water quality signal associated with human settlements. Community composition was related to abiotic variables commonly associated to pollution, such as alkalinity, dissolved solids, phosphates, and total organic carbon.

Keywords

Stream macroinvertebratesPanamaspatial variationseasonalitytropics
Type
Research Article
Information
Annales de Limnologie - International Journal of Limnology , Volume 46 , Issue 3 , 2010 , pp. 149 - 156
Copyright
© EDP Sciences, 2010

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