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| Registros recuperados: 208 | |
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| Fonteneau, A.. |
| This document present the maximum daily duration of searching time by the purse seiners in intertropical areas. The daily duration of daylight varies according the latitude and season, and searching for tuna schools can be conducted only during this time (e.g. between the times of sunrise and of sunset). This maximum daily searching time should be routinely used and should preferably replace the constant 13 or 12 hours of standard daily searching time presently used for French and Spanish purse seiners in the Indian and Atlantic Oceans. |
| Tipo: Proceedings Paper |
Palavras-chave: Purse seiners; Tuna fisheries; Seasonality. |
| Ano: 1998 |
URL: http://hdl.handle.net/1834/63 |
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| Mafuca, J.. |
| The reproductive biology of the Kapenta (Limnothrissa miodon), that supports the main commercial fishery in Lake Cahora Bassa (Mozambique) was investigated using monthly samples collected during 2003 and2004. This species was initially introduced in Lake Kariba in 1967/68 with the objective of filling up the pelagic environment that was created with dam closure. The fish is believed to have been able to negotiate the Kariba dam wall and became established in Cahora Bassa, some 250 km downstream, as well. The reproductive biology of Kapenta is known from Lake Tanganyika, where it is indigenous, and from Kariba,but no research has been performed, so far, in Cahora Bassa. Since many important biological attributes may vary from place to place, depending on... |
| Tipo: Journal Contribution |
Palavras-chave: Seasonality; Reproduction (biology); Sardine fisheries. |
| Ano: 2011 |
URL: http://hdl.handle.net/1834/5140 |
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| Barragán-G., R.G.; Canosa, A.; Niño, J.P.. |
| Se estimaron abundancia, biomasa, biovolumen y forma del bacterioplancton en tres estaciones de la bahía de Gaira (costa Caribe colombiana) en los períodos definidos para este estudio como: "lluvioso" (julio, agosto; 2003), "transición" (abril, octubre; 2004) y "seco" (febrero, marzo; 2004). Las meustras del bacterioplancton fueron tomadas a 0.5 y 42 m de profundidad, filtradas sobre filtros de policarbonato de 0.22 μm y cuantificadas utilizando microscopía de epifluorescencia con naranja de acridina y análisis de imagen. La abundancia bacteriana varió entre 1.3 x 105-2.9 x 106 células mL-1 en el período lluvioso, 8.8 x 104-2.2 x 106 células mL-1 en el período de transición y 6.7 x 104-3.9 x 105 células mL-1 en el período seco, la abundancia promedio fue... |
| Tipo: Journal Contribution |
Palavras-chave: Biomass; Seasonality; Biomass; Seasonality; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_34117. |
| Ano: 2009 |
URL: http://hdl.handle.net/1834/3594 |
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| Turchetto, Felipe; Fortes, Fabiano de Oliveira. |
| O presente estudo teve por objetivo analisar e descrever a dinâmica sazonal da deposição e decomposição de serapilheira na Floresta Estacional Decidual da região do Médio Alto Uruguai, RS. Para a determinação da deposição de serapilheira foram instalados 20 coletores de 1 m2 em uma área de um hectare, sendo realizadas avaliações mensais. Para a amostra da serapilheira acumulada nas estações sazonais, foram coletadas 20 amostras aleatórias em molduras de 25 cm x 25 cm. O material coletado foi identificado e separado nas frações: folhas, galhos e miscelânea. Após a estratificação, as amostras foram secas em estufa a 70 oC e pesadas. A deposição anual de serapilheira foi estimada em 7,14 t.ha-1, sendo composta por 58,54% de folhas, 28,69% de galhos e 12,77%... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Recursos Florestais; Engenharia Florestal; Ecologia Mineralização; Sazonalidade; Decomposição Mineralization; Seasonality; Decomposition. |
| Ano: 2014 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/735 |
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| Gomes,Tassia Turini; Gheler-Costa,Carla; Rinaldi,Caroline Anacleto; Santana,William. |
| Abstract Decapod crustaceans have a wide variety of feeding habits, alternating among herbivory, predation, saprophagy, and filtration. The occupation of various trophic positions in the food web is a key feature in the evolution of the group. Thus, we analyzed the natural diet of the crab Ocypode quadrata (Fabricius, 1787), commonly known as the ghost crab and typically found on sandy beaches. The crabs were collected in the region of Ubatuba, between July 2016 and May 2017. The individuals were dissected in the laboratory, and each stomach was weighed and visually assessed in relation to the degree of repletion. After identification and classification, the items found were grouped for the analysis. In analyzing the stomach contents of Ocypode quadrata,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ghost crab; Natural diet; Ocypodidae; Seasonality; Trophic ecology. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0031-10492019000100257 |
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| Viana,Laura Tillmann; Bustamante,Mercedes Maria da Cunha; Molina,Marirosa; Pinto,Alexandre de Siqueira; Kisselle,Keith; Zepp,Richard; Burke,Roger A. |
| The objective of this work was to evaluate the effects of fire regimes and vegetation cover on the structure and dynamics of soil microbial communities, through phospholipid fatty acid (PLFA) analysis. Comparisons were made between native areas with different woody covers ("cerrado stricto sensu" and "campo sujo"), under different fire regimes, and a 20-year-old active palisadegrass pasture in the Central Plateau of Brazil. Microbial biomass was higher in the native plots than in the pasture, and the highest monthly values were observed during the rainy season in the native plots. No significant differences were observed between fire regimes or between communities from the two native vegetation types. However, the principal component (PC) analysis... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Land use; Microbial diversity; PLFA; Savannas; Seasonality. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2011001200012 |
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| Campolim,Marcos Bührer; Henriques,Marcelo Barbosa; Petesse,Maria Letizia; Rezende,Karina Fernandes Oliveira; Barbieri,Edison. |
| Abstract: The objective of this work was to verify the existence of bioaccumulation in mussels of the species Perna perna, by determining the concentration of metal trace elements, in Urubuqueçaba Island, Santos Bay, Santos, SP, Brazil. Mussels were collected in natural banks and rocky shores, and sampling took place from April 2010 to June 2011. The concentration of the trace metal elements - aluminum, cadmium, cromium, copper, iron, manganese, nickel, lead, and zinc - was determined according to mussel sex, length, and seasonality classes, in a flame atomic absorption spectrometer. Statistical analyses were applied to the results with the use of the software PAST, with parametric and nonparametric approaches, at 5% probability. In the summer, mussels... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Perna perna; Bivalve mollusks; Bioaccumulation; Seasonality. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2017001201131 |
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| Anefalos, Lilian Cristina; Moreira, Silvia Rocha; Cipolli, Katia Maria Vieira Avelar Bittencourt; Turco, Patricia Helena Nogueira; Tavares, Paulo Eduardo Da Rocha. |
| O objetivo deste trabalho foi analisar o mercado de berinjela no período de 2001 a 2006 para estudar a evolução dos índices sazonais de volume e preço comercializados nos principais entrepostos de São Paulo e Minas Gerais. Para isso foram utilizadas séries históricas mensais de preços e volumes comercializados para se determinar seu padrão sazonal anual, a partir do método da média geométrica móvel centralizada. No caso da berinjela, verificou-se elevação da oferta do produto a partir de agosto e setembro, com conseqüente redução nos preços praticados nos entrepostos. Com a aplicação de novas tecnologias, pode ocorrer oferta de produtos de melhor qualidade, influenciando decisivamente a sazonalidade de preços no mercado... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Hortaliça; Sazonalidade; Entreposto; Produto fitoterápico; Vegetable; Seasonality; Mart; Fitoterapeutic product; Crop Production/Industries. |
| Ano: 2008 |
URL: http://purl.umn.edu/113377 |
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| Friesner, Daniel L.; McPherson, Matthew Q.; Rosenman, Robert. |
| Efficiency measurement has been one of the most extensively explored areas of health services research over the past two decades. Despite this attention, few studies have examined whether a providers efficiency varies on a monthly, quarterly or other, sub-annual basis. This paper presents an empirical study that looks for evidence of seasonal inefficiency. Using a quarterly panel of general, acute-care hospitals from Washington State, we find that hospital efficiency does vary over time; however, the nature of this dynamic inefficiency depends on the type of efficiency being measured. Our results suggest that technical and cost efficiency vary by quarter. Allocative and scale efficiency also vary on a quarterly basis, but only if the data are jointly... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Seasonality; Efficiency; Hospitals; Data envelopment analysis; Health Economics and Policy. |
| Ano: 2006 |
URL: http://purl.umn.edu/12957 |
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| Wang, Xiaoyang; Garcia, Philip. |
| Price volatility in the corn market has changed considerably globalization and stronger linkages to the energy complex. Using data from January 1989 through December 2009, we estimate and forecast the volatility in the corn market using futures daily prices. Estimates in a Fractional Integrated GARCH framework identify the importance of long memory, seasonality, and structural change. Recursively generated forecasts for up to 40-day horizons starting in January 2005 highlight the importance of seasonality, and long memory specifications which perform well at more distant horizons particularly with rising volatility. The forecast benefits of allowing for structural change in an adaptive framework are more difficult to identify except at more distant... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Corn price volatility; Long memory; Seasonality; Structural change; Forecasting; Agricultural Finance; Risk and Uncertainty. |
| Ano: 2011 |
URL: http://purl.umn.edu/103749 |
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| Capps, Oral, Jr.; Farris, Donald E.; Byrne, Patrick J.; Namken, Jerry C.; Lambert, Charles D.. |
| Key determinants of monthly wholesale prices for 12 beef cuts include the quantity of the specific cut, stickiness in prices, marketing costs, quantities of pork and chicken, and seasonality. Seasonal patterns across the respective cuts are very different. Relative to the price in December, prices at the wholesale level in other months can be as much as 6 percent lower to as much as 21 percent higher. |
| Tipo: Journal Article |
Palavras-chave: Wholesale prices; Beef cuts; Seasonality; Demand and Price Analysis; Livestock Production/Industries. |
| Ano: 1994 |
URL: http://purl.umn.edu/15429 |
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| Ling, K. Charles. |
| The rationale for compensating dairy cooperatives for the costs incurred in balancing milk supply for the fluid market is examined. A reserve-balancing pool is proposed to facilitate deducting supply-balancing service credit from a marketwide producer pool and making payment to cooperatives for providing the services. The volume of necessary reserves maintained for the fluid market determines the size of the reserve-balancing pool. A dairy cooperative qualifies for pool payment based on the volume of milk delivered for fluid uses and on the volume of necessary reserves actually balanced. An alternative qualification is to allocate the volume of necessary reserves each cooperative has to balance according to a cooperative's market share of milk for fluid... |
| Tipo: Report |
Palavras-chave: Cooperative; Milk; Reserve-balancing pool; Seasonality; Manufacturing costs; Marketwide services; Agribusiness. |
| Ano: 1985 |
URL: http://purl.umn.edu/50731 |
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| Registros recuperados: 208 | |
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