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Registros recuperados: 208
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The Spatiotemporal Dynamics of the Sources and Sinks of CO2 in the Global Coastal Ocean ArchiMer
Roobaert, Alizee; Laruelle, Goulven G.; Landschuetzer, Peter; Gruber, Nicolas; Chou, Lei; Regnier, Pierre.
In contrast to the open ocean, the sources and sinks for atmospheric carbon dioxide (CO2) in the coastal seas are poorly constrained and understood. Here we address this knowledge gap by analyzing the spatial and temporal variability of the coastal air-sea flux of CO2 (FCO2) using a recent high-resolution (0.25 degrees) monthly climatology for coastal sea surface partial pressure in CO2 (pCO(2)). Coastal regions are characterized by CO2 sinks at temperate and high latitudes and by CO2 sources at low latitude and in the tropics, with annual mean CO2 flux densities comparable in magnitude and pattern to those of the adjacent open ocean with the exception of river-dominated systems. The seasonal variations in FCO2 are large, often exceeding 2 mol C m(-2)...
Tipo: Text Palavras-chave: Coastal seas; Air-sea CO2 exchange; Seasonality; Ocean carbon cycle; Continental shelves.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00676/78795/81027.pdf
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The UK Consumer's Attitudes to, and Willingness to Pay for, imported Foods AgEcon
Arnoult, Matthieu H.; Lobb, Alexandra E.; Tiffin, J. Richard.
We report results from an investigation into consumer preferences for locally produced foods. Using a choice experiment we estimate willingness to pay for foods of a designated origin together with certification for Organic and GM free status. Our results indicate that there is a preference for locally produced food which is GM free, Organic and produced in the traditional season.
Tipo: Conference Paper or Presentation Palavras-chave: Imported food; Seasonality; Willingness-to-pay; Choice experiment; Demand and Price Analysis; Food Consumption/Nutrition/Food Safety; International Relations/Trade.
Ano: 2007 URL: http://purl.umn.edu/7893
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Trophic strategy of Atlantirivulus riograndensis (Cyprinodontiformes: Rivulidae), a non-annual rivulid threatened by extinction, in a perennial environment, Brazil) Neotropical Ichthyology
Cavalheiro,Laísa Wociechoski; Fialho,Clarice Bernhardt.
ABSTRACT Rivulidae includes non-annual fish of perennial habitats and annual fish of temporary wetlands. The objective of this research was to investigate the trophic strategy of Atlantirivulus riograndensis in a perennial environment. Sampling occurred in an environmental conservation unit in the Pampa biome, Brazil. Quantification of the diet followed the volumetric method. Consumption of autochthonous material as the main food source of the species followed the pattern of Rivulidae. Species is zooplanktonic when young. Food spectrum is broadened and insectivorousness increases with ontogeny, revealing a specialist trend in the feeding strategy of A. riograndensis. The most diverse feeding occurs in the spring and summer seasons in which the presence of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Autochthonous resources; Ontogeny; Seasonality; Specialist; Trophic pattern.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252016000100223
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U.S. Citrus Import Demand: Seasonality and Substitution AgEcon
Baldwin, Katherine L.; Jones, Keithly G..
Citrus fruits make up one-fifth of all fresh fruit consumed in the United States. Given the increasing importance of imported citrus in the diet of American consumers, it is perhaps surprising that no import demand analysis of U.S. citrus has been conducted. Using quarterly U.S. import data for six citrus commodities, we employed a demand systems model and evaluated aspects of seasonality. The results suggest wide variations in price responses to different types of imported citrus. The average amplitude and phase shift suggest that all citrus fruits exhibit some seasonality in their imports, likely a result of peak harvesting schedules of exporters.
Tipo: Presentation Palavras-chave: Fresh citrus; Oranges; Limes; Lemons; Grapefruit; Mandarins; Import demand; Seasonality; Demand and Price Analysis; International Relations/Trade.
Ano: 2012 URL: http://purl.umn.edu/119741
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Use of food resources by small fish species in Neotropical rivers: responses to spatial and temporal variations Rev. Bras. Zool.
Silva,Jislaine Cristina da; Gubiani,Éder André; Delariva,Rosilene Luciana.
Spatial and temporal variations in food supply play a crucial role in the determination of the patterns of food use by fish species. This study evaluated spatial and temporal variations in food utilization by small fish species of the Verde River, Upper Paraná River Basin, state of Mato Grosso do Sul, Brazil. Samplings were conducted in the rainy and dry periods, from November 2010 to August 2012, using trawls, cast nets and gillnets, in nine sampling sites grouped into three biotopes: upstream and downstream of the Branca Waterfall, and tributary. The stomach contents of 3,263 individuals of 12 small species were examined according to the volumetric method. Altogether, 31 food items were identified. Overall seed consumption was greater in the rainy...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Allochthonous resources; Diet; Fish fauna; Seasonality; Upper Paraná River Basin.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702014000500004
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Variação temporal da comunidade fitoplanctônica em lagos urbanos eutróficos - doi: 10.4025/actascibiolsci.v33i4.5955 Biological Sciences
Nabout, João Carlos; UFG; Nogueira, Ina Souza; UFG.
O objetivo desse trabalho foi averiguar a mudança sazonal e o sincronismo temporal de atributos da comunidade fitoplanctônica (diversidade e a densidade) de quatro reservatórios urbanos eutróficos (lago do Jardim Botânico, lago do parque Vaca Brava, lago das Rosas e lago do bosque dos Buritis) do município de Goiânia, Estado de Goiás. A diversidade foi estimada pelo índice de Shannon-Winner (H’) e a densidade foi pelo método de Utermöhl. Todos os quatro lagos apresentaram elevada diversidade fitoplanctônica, variando de H’ = 0,97 (bosque dos Buritis) a H’ = 4,29 (lago do Jardim Botânico), além disso, a diversidade foi significativamente distinta entre os quatro lagos estudados (F = 4,74; p < 0,001, n = 4). A densidade fitoplanctônica foi elevada, sendo...
Palavras-chave: Ecologia; Botanica; Taxonomia de criptógamos Densidade; Diversidade; Sincronismo; Lagos artificiais; Fatores locais; Sazonalidade Density; Diversity; Synchronism; Artificial lakes; Local factors; Seasonality.
Ano: 2011 URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/5955
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VERIFICAÇÃO DA EXISTÊNCIA DA COMPONENTE SAZONAL NA SÉRIE DO CUSTO DA CESTA BÁSICA DO MUNICÍPIO DE LAVRAS, MG, UTILIZANDO O MÉTODO X-12 ARIMA AgEcon
Carvalho, Pedro Luiz Costa; Ferraz, Marcelo Inacio Ferreira; Safadi, Thelma.
This paper has the objective to studying the seasonal behavior of the series of Cost of Basic Basket (basic food) in Lavras county, MG, using one of the most modern and recent methods of seasonal adjustment, the method X-12ARIMA, developed for the U.S. Census Bureau. If seasonal is identified, one seasonal adjustment will be made using the automatic program of X-12 ARIMA. The data basis was provided by the Department of Management and Economics – DAE – of the University of Lavras – UFLA – including monthly observation from January of 1995 to December of 2004. The existence of seasonal was proved in the series of the Cost of Basic Basket of Lavras, MG. The analysis of the graph on the seasonal effects showed that from October to March (rain period) the...
Tipo: Journal Article Palavras-chave: Basket basic; Seasonality; Time series; X-12 ARIMA..
Ano: 2006 URL: http://purl.umn.edu/43822
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What are the main local drivers determining richness and fishery yields in tropical coastal fish assemblages? Rev. Bras. Zool.
Souza,Cynthia D.; Batista,Vandick S.; Fabré,Nidia N..
ABSTRACT Seasonal ecological effects caused by temperature and photoperiod are typically considered minimal in the tropics. Nevertheless, annual climate cycles may still influence the distribution and abundance of tropical species. Here, we investigate whether seasonal patterns of precipitation and wind speed influence the structure of coastal fish assemblages and fishing yields in northeast Brazil. Research trips were conducted during the rainy and dry seasons using commercial boats and gear to sample the fish community. Diversity was analyzed using abundance Whittaker curves, diversity profiles and the Shannon index. Principal Component Analysis (PCA) was used to analyze associations between the abundance of species and various environmental variables...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Artisanal fishing; Fishes; Wind; Precipitation; Seasonality; Gillnet.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702018000100304
Registros recuperados: 208
Primeira ... 34567891011 ... Última
 

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