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Title: Autochthonous primary production in southern Amazon headwater streams: Novel indicators of altered environmental integrity
Authors: Bleich, Monica Elisa
Piedade, Maria Teresa Fernandez
Mortati, Amanda Frederico
André, Thiago
Keywords: Biomarkers
Plants (botany)
Algal Biomass
Aquatic Plants
Environmental Integrity
Herbaceous Plants
Herbaceous Species
Primary Producers
Primary Production
Temporal Variation
Aquatic Community
Environmental Response
Plant Community
Primary Production
Riparian Forest
Seasonal Variation
Stream Flow
Water Column
Issue Date: 2015
metadata.dc.publisher.journal: Ecological Indicators
metadata.dc.relation.ispartof: Volume 53, Pags. 154-161
Abstract: The riparian forest reduces the amount of light entering streams, which limits autochthonous primary production. The aim of this study was to evaluate temporal variation of autochthonous primary production in pristine and altered streams, with the goal of identifying indicators of change in environmental integrity in the southern Brazilian Amazon. We evaluated free algal biomass in the water column, the presence of periphyton, and the richness and cover of aquatic herbaceous plants in 20 streams (10 pristine and 10 altered, i.e., with riparian deforestation) during the dry period, at the beginning of the rainy period, and at the end of the rainy period. In altered streams, we recorded the presence of macroscopic periphyton and the amount of algal biomass varied between the dry and flood seasons. Variations in hydrological periods did not contribute to changes in algal biomass in pristine streams; we did not observe the presence of macroscopic periphyton these streams. In altered streams, 23 aquatic herbaceous species were identified, versus only four in the pristine streams. Results showed that riparian deforestation contributes to increased autochthonous primary production, which is also influenced by different hydrological periods, with algae and aquatic herbaceous plants responding differently to dry and rainy periods. The responses of these primary producers confirm their role as important bioindicators of change in the environmental integrity of southern Amazonian streams. © 2015 Elsevier Ltd. All rights reserved.
metadata.dc.identifier.doi: 10.1016/j.ecolind.2015.01.040
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