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| Registros recuperados: 214 | |
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| Just, David R.; Cao, Ying; Zilberman, David. |
| Previous studies have found underestimation of risk, or overconfidence, to be pervasive. In this paper, we model overconfidence as a reduction in perceived variance. We generalize the analysis of Sandmo and examine the effects of competition on firms displaying overconfidence. Cases for both competitive equilibrium and imperfect competition are investigated. We show that overconfidence may strictly dominate rationality in a competitive market by leading risk averse producers to invest greater amounts and produce more. This leads to a higher average profit, and greater variance of profits, leaving the producer a greater probability of surviving competitive pressures. Despite the greater variance of profits, if enough producers underestimate their risk, they... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Overconfidence; Misperception; Production; Competition; Production Economics; Risk and Uncertainty. |
| Ano: 2009 |
URL: http://purl.umn.edu/49161 |
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| Capdeville,Guy de; Souza Júnior,Manoel Teixeira; Santos,Jansen Rodrigo Pereira; Miranda,Simoni Paula; Caetano,Alexandre Rodrigues; Falcão,Rosana; Gomes,Ana Cristina Menezes Mendes. |
| The objective of this work was to investigate possible modes of action of the yeast Cryptococcus magnus in controlling anthracnose (Colletotrichum gloeosporioides) on post harvested papaya fruits. Scanning electron microscopy was used to analyze the effect of the yeast on inoculations done after harvest. Results showed that C. magnus is able to colonize wound surfaces much faster than the pathogen, outcompeting the later for space and probably for nutrients. In addition, C. magnus produces a flocculent matrix, which affects hyphae integrity. The competition for space and the production of substances that affect hyphae integrity are among the most important modes of action of this yeast. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Carica papaya; Anthracnose; Antagonist yeast; Biological control; Competition. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2007001100004 |
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| Linzmeier,Adelita Maria; Ribeiro-Costa,Cibele Stramare. |
| Seasonality was studied for Alticini trapped with malaise over a period of two years in the Vila Velha State Park, Parana, Brazil. Coleoptera, Chrysomelidae and Alticini showed seasonal distribution, with the highest abundance during spring and summer months. The abundance peaks of these groups were not synchronized. Of all environmental variables tested, photoperiod had the larger effect on the distributional patterns of Coleoptera, Chrysomelidae and Alticini. Also, Chrysomelidae and Alticini probably are related to the quality and availability of host-plants. When richness was high there was a greater similarity among seasons of different years. However, when richness was not pronounced, seasons showed more similarity within the same year than between... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Abundance; Community structure; Competition; Herbivorous; Seasonality. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262008000200009 |
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| Zuiderwijk, Annie. |
| Courtship display characteristics are described and compared for the newts Triturus cristatus and T. marmoratus and patterns of male competitive behaviour are recognized. In interpreting the data, the operational sex ratio has to be taken into account, which was highly biased towards males in both species, more in T. marmoratus than in T. cristatus. When sexual active, males of cristatus had more encounters than males of marmoratus, whereas the latter spent more time residing mating places. The male’s display towards a female differed in time structure, variability and in behaviour characteristics. T. marmoratus display follows a fixed pattern; males succeeded better in restraining a female than males cristatus did. Courting males cristatus allowed other... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Salamandridae; Triturus; Courtship behaviour; Sexual strategy; Competition. |
| Ano: 1990 |
URL: http://www.repository.naturalis.nl/record/504436 |
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| Putsis, William P., Jr.; Cotterill, Ronald W.. |
| Focusing on the interaction between national brands and private labels, this paper has two main empirical contributions: i) a simultaneous system of demand (share), price and expenditure equations is estimated, and ii) differences in the structure of the local geographic market are incorporated into the analysis. The former represents an important step in understanding the complete nature of private label and national brand interaction, while the latter is important for understanding the impact of the local retail environment on market behavior. IRI scanner data from 1991 and 1992 are used to estimate the three-equation system across 135 food product categories and 59 geographic markets. The results suggest that concentration at both the manufacturer and... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Competition; Private labels; Industrial organization; Demand and Price Analysis; Industrial Organization; Marketing. |
| Ano: 2000 |
URL: http://purl.umn.edu/25166 |
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| De Wit, Rutger; Troussellier, Marc; Courties, Claude; Buffan-dubau, Evelyne; Lemaire, Emmanuelle. |
| We experimentally simulated the temporality of the interactions between intertidal seagrasses and phytoplankton in the context of nutrient enrichment from continental origin. Phytoplankton development was retarded after 1-day exposure to intertidal Zostera noltii Hornemann vegetation samples, with respect to control treatments. This was not explained by resource competition and we hypothesized a direct interference between seagrass leaves and phytoplankton. After separation from the vegetation in 5-day incubations, the final yield of large phytoplankton, mainly diatoms and haptophytes, was determined by nutrient loading. In contrast, Synechococcus-like cells (SYN), phototrophic picoeukaryotes and nanophytoplankton decreased after day 3, most likely due to... |
| Tipo: Text |
Palavras-chave: Competition; Allelopathy; Zostera noltii; Sediment; Intertidal vegetation; Flow cytometry; Photosynthetic pigments. |
| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00106/21717/19414.pdf |
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| Trenkel, Verena; Le Loch, Francois; Rochet, Marie-joelle. |
| In the summer of 2004, a video survey was carried out in the northern part of the central mud bank (Grande Vasiere) of the Bay of Biscay to study the small scale relationship between the dominant crustacean megafauna Nephrops norvegicus, Munida rugosa and Goneplax rhomboides and juvenile hake (Merluccius merluccius). Using a towed body, high-resolution videos were recorded in six sampling sites. Statistical modelling using generalised additive models (GAM) revealed variations in activity patterns for two species. More N. norvegicus were observed outside their burrows at dawn and somewhat at dusk (no observations during night) while G. rhomboides was less observed in the morning. In addition, reduced spatial overlap between G. rhomboides and N. norvegicus... |
| Tipo: Text |
Palavras-chave: Competition; Variations in activity patterns; Video; Benthos. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/publication-2614.pdf |
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| Mesquita, Mário Luiz Ribeiro; Andrade, Leonaldo Alves; Pereira, Walter Esfrain. |
| The objective of this research was to assess the density, floristic composition, phytosociology and diversity of a soil weed seed bank ex situ by germination in a greenhouse and in situ by weed sampling on a smallholder corn field located in Lago Verde County, Maranhão State. Fifteen pairs of 25 m2 plots were designated. In half of these plots, 90 soil samples were collected with an open metal template measuring 25 x 16 x 3 cm and placed in a greenhouse to germinate. In the other half, 90 weed samples were collected using the same metal template. We recorded a total of 1,998 individuals from 40 species, 31 genera and 16 families, from which 659 individuals germinated in situ and 1,339 exsitu. Density was higher ex situ, with 372 plants m-2. The Cyperaceae... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ciências Agrárias Fitotecnia cyperaceae; Competition; Biological invasion; Phytosociology; Smallholder farmers Botânica Sistemática Plantas Invasoras. |
| Ano: 2014 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/19360 |
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| Carvalho,L.B; Alves,P.L.C.A; Bianco,S. |
| The objective of this work was to evaluate the coexistence effects of coffee (Coffea arabica) with densities of sourgrass (Digitaria insularis) on crop macronutrient content and plant growth. The experiment was conducted in plots where one coffee plant was maintained in coexistence with 0 (weed-free check), 1, 2, 4, 8, and 16 sourgrass plants, using a completely randomized design with three replicates. Reduction of coffee growth and macronutrient content, except P that increased, started when the coexistence occurred with sourgrass plants in a density of 1 plant per plot. In general, macronutrient content was reduced by 18-50%, while growth characteristics were reduced by 9-41%, when coffee plants coexisted with 16 plants of sourgrass. Thus, sourgrass... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Coffea arabica; Digitaria insularis; Competition; Additive experiment; Nutrients. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582013000100012 |
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| Manchester, Alden C.; Blayney, Donald P.. |
| The U.S. dairy industry, many segments of which supported dairy policy changes in the 1996 Federal Agriculture Improvement and Reform Act, is much different than it was 20 or even 10 years ago. This report provides a historical overview of the industry, more detailed examinations of the fluid milk market and selected manufactured dairy product markets, a discussion of future prospects and trends in the industry, and some thoughts on the implications of those prospects and trends for dairy farmers and their organizations, processors, dairy product manufacturers, and retailers. |
| Tipo: Report |
Palavras-chave: Dairy; Butter; Cheese; Nonfat dry milk; Market structure; Pricing; Competition; Livestock Production/Industries; Marketing. |
| Ano: 1997 |
URL: http://purl.umn.edu/33929 |
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| Suzuki, Kei K.; Yoshida, Tomoya; Yamane, Yutaka; Shimamoto, Tatsuki; Furukawa, Ryuji G.; Yanagawa, Hisashi. |
| Describing the interactions among cavity breeders is key to understanding their breeding ecology. In this study the temporal difference in cavity use between the great tit, Parus major (Linnaeus, 1758) and the small Japanese field mice, Apodemus argenteus (Temminck, 1845) is investigated, as a first step for clarifying the interaction between bird and mammal cavity breeders. Forty-seven nest boxes were installed on tree trunks in two urban forests of Hokkaido Island, Japan, and the breeding nests of tits and mice were found in 34 and 11 boxes, respectively. The tits used the nest boxes throughout the breeding season, from May to July. In contrast, mice breeding nests were found in the last half of the breeding season, from July to October. Our results... |
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Palavras-chave: Bird-mammal interaction; Breeding ecology; Competition; Reproduction strategy; Tree cavities. |
| Ano: 2017 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/4562 |
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| Suzuki,Kei K.; Yoshida,Tomoya; Yamane,Yutaka; Shimamoto,Tatsuki; Furukawa,Ryuji G.; Yanagawa,Hisashi. |
| ABSTRACT Describing the interactions among cavity breeders is key to understanding their breeding ecology. In this study the temporal difference in cavity use between the great tit, Parus major (Linnaeus, 1758) and the small Japanese field mice, Apodemus argenteus (Temminck, 1845) is investigated, as a first step for clarifying the interaction between bird and mammal cavity breeders. Forty-seven nest boxes were installed on tree trunks in two urban forests of Hokkaido Island, Japan, and the breeding nests of tits and mice were found in 34 and 11 boxes, respectively. The tits used the nest boxes throughout the breeding season, from May to July. In contrast, mice breeding nests were found in the last half of the breeding season, from July to October. Our... |
| Tipo: Info:eu-repo/semantics/other |
Palavras-chave: Bird-mammal interaction; Breeding ecology; Competition; Reproduction strategy; Tree cavities. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702017000100500 |
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| Rocha,Carlos Frederico Duarte da; Duarte,Marcelo. |
| The use of nectar and pollen of a bromeliad by two heliconiine butterflies, Heliconius ethilla narcaea Godart, 1819 and H. sara apseudes (Hübner, [1813]) (Lepidoptera, Nymphalidae, Heliconiinae), is herein reported. Observations were made during a pollination study of Aechmea gracilis Lindman (Bromeliaceae, Bromelioidea) in a second-growth forest of the village Vila Dois Rios, Ilha Grande, Rio de Janeiro State, southeastern Brazil. Field observations showed that H. ethilla can be more aggressive than H. sara in exploiting A. gracilis floral resources. Temporal differences in the use of these resources were also observed: H. sara remained comparatively less time on flowers than H. ethilla. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Lepidoptera; Heliconius; Pollination; Aechmea gracilis; Competition; Home range. |
| Ano: 2001 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752001000500027 |
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| Registros recuperados: 214 | |
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