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Downstream passage of fish larvae and eggs through a small-sized reservoir, Mucuri river, Brazil Rev. Bras. Zool.
Pompeu,Paulo S.; Nogueira,Lorena B.; Godinho,Hugo P.; Martinez,Carlos B..
In South America, one important symptom of the failure of fish passages to sustain fish migratory recruitment is the inability of eggs and larvae to reach the nurseries. This is especially so when the breeding areas are located upstream of a reservoir, and the floodplain is downstream of the dam. Therefore, the transport of fish larvae and eggs across reservoir barriers is a key factor in the development of effective conservation strategies. In this paper, we evaluate the potential for migratory fish larvae and egg transportation across a small size reservoir in eastern Brazil. We sampled fish daily between 15th October 2002 and 15th February 2003 (spawning period) in the Mucuri River, immediately upstream of the reservoir and downstream of the Santa Clara...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Conservation; Downstream passage; Drift larvae; Migratory fish; Reservoir management.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702011000600006
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Economic drought management index to evaluate water institutions' performance under uncertainty AgEcon
Iglesias, Eva; Garrido, Alberto; Gomez-Ramos, Almudena.
Reservoir management and intertemporal water allocation are critical issues in semiarid regions where agriculture has to confront highly variable rainfall patterns. In this paper, we derive and propose an economic drought management index (EDMI) to evaluate water institutions' performance to cope with drought risk. The EDMI is based on the optimal conditions of a stochastic dynamic optimisation problem that characterises reservoir management. The index's main advantages are its ease of interpretation and breadth of scope, as it incorporates information on hydrological processes, structural constraints, water institutions' rules, and the economic benefits of water use. An empirical application is developed to assess the institutional rules governing water...
Tipo: Journal Article Palavras-chave: Drought risk; Irrigation; Reservoir management; Water institutions; Water management; Water resources; Resource /Energy Economics and Policy.
Ano: 2007 URL: http://purl.umn.edu/118316
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Integrated Reservoir Management under Stochastic Conditions AgEcon
Debnath, Deepayan; Stoecker, Arthur L.; Boyer, Tracy A.; Sanders, Larry D..
Water Management and Planning
Tipo: Conference Paper or Presentation Palavras-chave: Economic optimization; Lake levels; Marketed and non-marketed water uses; Non-linear programming; Recreational benefits; Reservoir management; Stochastic inflows; Value of a visitor day; Environmental Economics and Policy; International Development; Land Economics/Use; Production Economics; Productivity Analysis; Public Economics; Resource /Energy Economics and Policy; Risk and Uncertainty.
Ano: 2011 URL: http://purl.umn.edu/108178
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Potential effects of mechanically removing macrophytes on the phytoplankton community of a subtropical reservoir Acta Botanica
Wojciechowski,Juliana; Burda,Tamires Marcela; Scheer,Mauricio Bergamini; Costa,Elaine Aparecida Dias da; Fernandes,Luciano Felício.
ABSTRACT Intensive growth of aquatic macrophytes interferes with water quality and ecosystem dynamics worldwide. Although mechanically removing macrophytes is the most commonly used method for their eradication, it can also cause undesirable disturbances in aquatic reservoir communities. We performed laboratory incubations of phytoplankton sampled before and after macrophytes were mechanically removed from the Piraquara II reservoir, South Brazil. We analyzed changes in growth and composition of the main phytoplankton groups with respect to nutrient shifting. Prior to removing the macrophytes, the phytoplankton community was dominated by low cell abundances of diatoms and flagellates. In contrast, growth rates of cyanobacteria (mainly Cylindrospermopsis...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Chlorophytes; Cyanobacteria; Diatoms; Macrophytes; Mechanical removal; Phytoplankton; Reservoir management.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062018000400588
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Seasonal water level fluctuations: Implications for reservoir limnology and management IPB - Escola Superior Agrária
Geraldes, Ana Maria; Boavida, Maria José.
With the purpose of finding out whether seasonal water level fluctuations could affect water quality in a reservoir subjected to those changes, trends in environmental variables and in phytoplankton and zooplankton assemblages were analysed. The reservoir’s hydrological cycle was characterized by three regimes. The maximum level phase lasted from January to the beginning of June, the emptying phase existed between mid-June to the beginning of September and the minimum level phase lasted from mid-September to the beginning of the first autumn/winter rain events. The highest values of total phosphorus, soluble reactive phosphorus, nitrate, water colour and chlorophyll a were found during the minimum level phase. The phytoplankton assemblage was dominated by...
Tipo: Article Palavras-chave: Nutrients; Phytoplankton and zooplankton assemblages; Reservoir management; Reservoirs; Water level fluctuation.
Ano: 2005 URL: http://hdl.handle.net/10198/711
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