NDLI: Does hydroelectric reservoirs affect the structure of surrounding tree communities? A test of hypotheses in subtropical South America

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Does hydroelectric reservoirs affect the structure of surrounding tree communities? A test of hypotheses in subtropical South America

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Brazilian Journal of Botany : Volume 40, Issue 2, June 2017

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Does hydroelectric reservoirs affect the structure of surrounding tree communities? A test of hypotheses in subtropical South America

Content Provider	Springer Nature Link
Author	Urruth, Leonardo Marques Oliveira, JuliaMorales Souza, Alexandre Fadigas
Copyright Year	2017
Abstract	Despite its advantages over other energy sources, hydropower facilities are recognized as causes of terrestrial and freshwater environmental impacts. A deeper understanding of hydropower effects on surrounding riparian forests is thus important to the development hydropower facilities of less impact on the environment as well as to define criteria to manage the vegetation in the vicinity of large hydroelectric dams. We compared tree community structure on forest slopes exposed to a hydropower reservoir created in 2005 with control ones, in the biodiversity-rich subtropical forests of southern Brazil. Field data were collected between 2009 and 2011 on six forest slopes of which three were affected by the rise in water level caused by a hydropower dam, while the other three were in nearby sites unaffected by damming. Ninety 10 × 10 plots were set along six 50 m × 10 m transects. Forest structure was significantly affected by vicinity of reservoir, but this effect differed significantly between different tributaries of the Pelotas River. Rarefaction curves showed homogeneity in species richness among the studied hills. Composition differed significantly between reservoir and control areas. Variance partition results showed that pure reservoir effects explained a fraction of the variance in floristic composition comparable to environmental factors. Vicinity to reservoir was the main factor able to distinguish between communities in the studied system in a multiple regression tree. Our results highlight that hydroelectric facility building produces more extensive damage to remnant native forests than anticipated and that even forests upslope from reservoir border may suffer rapid structural and compositional degradation due to changes in environmental conditions caused by altered hydrology.
Starting Page	705
Ending Page	715
Page Count	11
File Format	PDF
ISSN	01008404
Journal	Brazilian Journal of Botany
Volume Number	40
Issue Number	3
e-ISSN	18069959
Language	English
Publisher	Springer International Publishing
Publisher Date	2017-03-28
Publisher Place	Cham
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Atlantic forest Plant Systematics/Taxonomy/Biogeography Araucaria mixed forest Mixed forests Dam impacts Southern Brazil
Content Type	Text
Resource Type	Article
Subject	Plant Science

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