Changes in benthic algal communities following construction of a run-of-river dam

Wu, Naicheng; Tang, Tao; Zhou, Shurong; Jia, Xinghuan; Li, Daofeng; Liu, Ruiqiu; Cai, Qinghua

doi:10.1899/08-047.1

Cited by 51 publications

(58 citation statements)

References 34 publications

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“…The Gufu River, the Gaolan River, and the Jiuchong River are the three main tributaries (ZHOU et al, 2008;WU et al, 2009) (Fig. 1).…”

Section: Study Area and Site Settingmentioning

confidence: 99%

“…As th e biggest tributary of the Three Gorges Reservoir (TGR) in Hubei province, the Xiangxi River can strongly influence water quality of the TGR (ZHOU et al, 2008;WU et al, 2009). In order to represent the actual condition, we had two principles for our site selecting: (1) the distance between two sites was about 4 km; and (2) we sampled as many as possible in this watershed.…”

Section: Study Area and Site Settingmentioning

confidence: 99%

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Developing a Benthic Index of Biological Integrity and Some Relationships to Environmental Factors in the Subtropical Xiangxi River, China

Li¹,

Cai²,

Ye³

2010

International Review of Hydrobiology

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The aim of this study is to develop a benthic index of biotic integrity (B-IBI) to help understand how the increasing anthropogenic pressure may impact the subtropical Xiangxi River in China. Benthic macroinvertebrate and environmental surveys were conducted at 77 sites in early summer 2004. Each collection site was categorized as reference or impaired based on physical, chemical, biological, and land-use information. Six non-redundant metrics from 35 metrics were used to differentiate between reference and impaired sites. We selected six metrics for the final IBI. The scoring criteria of each metric were normalized based on the quadrisection and 0-10 scaling systems. Both scaling methods were used to assess the aquatic health of each site in the Xiangxi River watershed. The results showed that most sites were in fairly poor condition. Furthermore, we identified the relationship between B-IBI metrics, water-quality, and land-use variables with a principal component analysis. A composite of nutrients and land-use intensity explained most variances. These results suggest that the B-IBI may be a suitable method for assessing river conditions within the subtropical Xiangxi River in central China. IntroductionAquatic ecosystems, and their biological assemblages, continued to be degraded globally from anthropogenic activities in their watersheds (GANASAN and HUGHES, 1998;KARR, 1999). Part of the decline in water resources stems from insufficient consideration of their biological structure and function (KARR, 1999;STODDARD et al., 2006). Some factors have been reported which are linked to river degradation. Physical and chemical factors may be related to biological changes (MULLINS, 1999). Water quality may only partially reflect environmental impact (BOZZETTI and SCHULZ, 2004). Researchers increasingly include quantitative biological indicators (JOY and DEATH, 2004;ROSET et al., 2007). Biological indicators may reflect the intensity of anthropogenic stress and have been used as a tool in risk assessment and evaluation of human induced changes in freshwater ecosystem (KAMDEN-TOHAM and TEUGELS, 1999

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“…The Gufu River, the Gaolan River, and the Jiuchong River are the three main tributaries (ZHOU et al, 2008;WU et al, 2009) (Fig. 1).…”

Section: Study Area and Site Settingmentioning

confidence: 99%

Section: Study Area and Site Settingmentioning

confidence: 99%

Developing a Benthic Index of Biological Integrity and Some Relationships to Environmental Factors in the Subtropical Xiangxi River, China

Li¹,

Cai²,

Ye³

2010

International Review of Hydrobiology

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“…Such responses have been widely documented to inform management decisions about the implementation of environmental flows; i.e., the flows left in streams to sustain biodiversity, ecological integrity and ecosystems service (Acreman & Dunbar, 2004;Brisbane Declaration, 2007;Arthington et al, 2010). Nonetheless studies on the relationships between flow reduction and responses of stream algal assemblages are scarce compared with those dealing with macroinvertebrates and fishes, and most such studies are focused mainly on single streams in temperate or subtropical latitudes (Clausen & Biggs, 1997;Downes et al, 2003;Soininen, 2003;Suren et al, 2003;Wang et al, 2009;Wu et al, 2009). Comparable studies on tropical or monsoonal streams-with markedly seasonal flow regimes-are scarce (Niu & Dudgeon, 2011a).…”

Section: Introductionmentioning

confidence: 99%

Responses of epibenthic algal assemblages to water abstraction in Hong Kong streams

2012

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We studied the effects of flow reduction on epibenthic algal assemblages by comparing up-and down-stream reaches of ten Hong Kong streams subject to different degrees of water abstraction during [2007][2008]. Downstream discharge declined by 71 and 54% during the wet and dry seasons, respectively. Algal responses varied seasonally and according to morphological guild and reflecting reductions in discharge and current velocity, or changes in total nitrogen and phosphate, or their combined effects. Significant inter-reach assemblage differences were observed during the both seasons, but wet-season assemblage structure was not directly influenced by any flow-related variable. During the dry season, scouring-tolerant prostrate/adnate diatoms (especially Achnanthes, Cocconeis) were relatively abundant upstream, whereas intolerant stalked (Eunotia, Gomphonema) and mobile diatoms were more numerous downstream. Both low-and high-profile (erect diatoms, Chamaesiphon, Calothrix) guilds were sensitive to changes in nutrients. Low-flow conditions downstream, surprisingly, enhanced algal diversity, and richness. Based on the linear response of Cocconeis (mainly C. placentula) to discharge reduction, we recommend that[65% of dry-season discharge should be maintained in downstream reaches in order to sustain near-natural algal assemblages; 32% of discharge is required to avoid substantial alterations in assemblage structure.

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“…Alteração das características físicas do rio, como velocidade do fluxo, profundidade do canal e largura do canal, e alteração da disponibilidade de refúgios para a fauna Fu et al, 2008;Zhou et al, 2009;Wu et al, 2009;2012;Benejan et al, 2014 Ictiofauna: redução da densidade populacional, redução da biomassa populacional, redução da abundância populacional, alteração da abundância relativa, alteração de ordens dominantes, desaparecimento de espécies raras, alteração da estrutura etária, redução de peso e comprimento dos indivíduos Almodóvar, Nicola, 1999;Hirschmann et al, 2008;Benejan et al, 2014 Macroinvertebrados: redução da diversidade, alteração na composição de espécies, alteração na dominância de grupos funcionais e alteração na densidade em diferentes pontos do rio Cortes et al, 1998;Fu et al, 2008 Zooplâncton: alteração na densidade e na riqueza de espécies em diferentes pontos do rio Zhou et al, 2009 Algas: alteração na riqueza de espécies à montante e à jusante, redução da diversidade, alteração da composição de espécies, redução da porcentagem de indivíduos eretos. Wu et al, 2009; Menor Índice de Integridade Biológica em locais sob influência de PCHs Wu et al, 2012 após a construção da PCH (Almodóvar & Nicola, 1999).…”

Section: Impactos Referênciasunclassified

“…Wu et al, 2009; Menor Índice de Integridade Biológica em locais sob influência de PCHs Wu et al, 2012 após a construção da PCH (Almodóvar & Nicola, 1999). Do mesmo modo, as mudanças na estrutura de comunidades foram registradas por meio de modificações de parâmetros demográficos, como abundância relativa e dominância de espécies, e, também, pela alteração da composição de espécies.…”

Section: Impactos Referênciasunclassified

Examinando as contradições em torno das Pequenas Centrais Hidrelétricas como fontes sustentáveis de energia no Brasil

Latini

Pedlowski

2016

Desenvolv. Meio Ambiente

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Artigo recebido em 12 de agosto de 2015, versão final aceita em 20 de abril de 2016. RESUMO:As Pequenas Centrais Hidrelétricas (PCHs) vêm ganhando destaque nos esforços voltados para a expansão da oferta de energia elétrica em âmbito mundial. Tal fato se deve à ideia de que essas plantas de geração de energia, por seu menor porte, causariam impactos ambientais insignificantes, quando comparadas com grandes usinas hidrelétricas. Em função disso, o Brasil tem flexibilizado as normas ambientais e concedido incentivos financeiros com o objetivo de facilitar e agilizar a implantação de PCHs no país. Além disso, programas governamentais, como o PROINFA e o "Luz para Todos", também podem ter contribuído para a expansão desse tipo de empreendimento nos últimos anos. Apesar da imagem limpa e dos incentivos concedidos, diferentes pesquisas científicas têm demonstrado evidências de que as PCHs, mesmo com seu menor porte, alteram as características hidrológicas dos ecossistemas aquáticos e causam impactos à biota em níveis individual, populacional e de comunidades. Em adição, já existem evidências de que alguns impactos ambientais acarretados por um conjunto de PCHs podem ser maiores do que os impactos causados por usinas hidrelétricas de grande porte. Portanto, não existem motivos para facilitar e agilizar os processos de aprovação e implementação de PCHs. O presente artigo aponta que as estratégias utilizadas para acelerar a implantação de PCHs contribuem para fragilizar os instrumentos de controle ambiental adotados no Brasil e para disseminar a percepção de que esses instrumentos são entraves ao desenvolvimento econômico, colocando, assim, a questão ambiental em patamares inferiores nas decisões tomadas no setor elétrico. O artigo postula, ainda, que as PCHs, como qualquer outro empreendimento potencialmente poluidor, devem ser alvo de uma avaliação socioambiental criteriosa, que possa subsidiar o processo decisório sobre as alternativas para a expansão da oferta de energia elétrica no Brasil.Palavras-chave: PCH; impactos ambientais; incentivos governamentais.

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Changes in benthic algal communities following construction of a run-of-river dam

Cited by 51 publications

References 34 publications

Developing a Benthic Index of Biological Integrity and Some Relationships to Environmental Factors in the Subtropical Xiangxi River, China

Developing a Benthic Index of Biological Integrity and Some Relationships to Environmental Factors in the Subtropical Xiangxi River, China

Responses of epibenthic algal assemblages to water abstraction in Hong Kong streams

Examinando as contradições em torno das Pequenas Centrais Hidrelétricas como fontes sustentáveis de energia no Brasil

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