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| Registros recuperados: 2.472 | |
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| Hostim-Silva,Maurício; Ribeiro,Gisela Costa; Clezar,Leandro; Ledo,Blanca Sierra de. |
| Attempting to contribute with the knowledge about the bioecological aspects concerning the youth forms of M. furnieri (Desmarest, 1823) and C. leiarchus (Cuvier, 1830) from Itacorubi mangrove, 15 samplings were taken from January 1988 to March 1989. Using casting and entangle nets, a total of 308 individuais from these species were captured. Their abundanee were: M. furnieri N = 197 (64,0%); C. leiarchus N = 111 (36,0%). The relative frequency and range of total weights and lengths were studied. Concerning spatial distribution of the species, it was observed that M. furnieri occurred in all areas and C. leiarchus was not captured only in "D" area (Sertão River). During the anual cycle the two species occurred jointly. The results emphasize other authors... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Sciaenidae; Mangrove; Abundance; Distribution. |
| Ano: 1992 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751992000200011 |
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| Claisse, Didier. |
| Les organismes marins, et en particulier les coquillages, ont la propriété d'accumuler les contaminants présents dans le milieu. Le consommateur va donc retrouver dans son assiette ces produits indésirables et peut-être nuisibles à sa santé. Le facteur de concentration entre l'eau de mer et les tissus des coquillages peut être très élevé. Ce qui est un inconvénient pour le consommateur devient d'un intérêt primordial pour les environnementalistes cherchant à évaluer la qualité du milieu marin. En effet la capacité d'accumulation des contaminants par les coquillages permet de les utiliser comme indicateurs de pollution. Certains résultats du Réseau National d'Observation de la qualité du milieu marin (RNO) sont présentés ici puis rapportés aux quantités... |
| Tipo: Text |
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| Ano: 1992 |
URL: http://archimer.ifremer.fr/doc/00017/12785/9726.pdf |
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| The Action Sheet is an up-dated version of the status of implementation of decisions & recommendations of IODE-XIV as of 1 November 1995. This updated version is a Supplement to Document IOC/IODE-XV/6 "Report on Intersessional Activities of the Chairman of the IOC Committee on IODE". |
| Tipo: Report |
Palavras-chave: Aquatic sciences; Oceanography. |
| Ano: 1992 |
URL: http://hdl.handle.net/1834/1595 |
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| Henriet, J.-P.; Meissner, R.; Miller, L.W.. |
| The Antarctic Peninsula has a remarkable record of active margin processes, which include subduction with progressive ridge-trench collisions, margin segmentation by major fracture zones, rifting in a hybrid back-arc and sheared plate margin context, fore-arc development and glacial-marine controlled trench fill processes.Several facets of these margin processes both of internal (crustal dynamic) and external origin (climate-controlled) have been documented by a geophysical survey during the Antarktis VI/2 cruise of R.V. <i>Polarstern</i> (October-December-1987).Reflection seismic profiles have been shot over the rift basin of Bransfield Strait, over an elongated sediment-filled trough interpreted as a fore-arc basin, over accretional and... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1992 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=2802 |
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| Shapiro, Barry Ira; Brorsen, B. Wade; Doster, D. Howard. |
| Double-cropping of soybeans and wheat is often promoted by extension personnel. This paper seeks to explain how the decision to adopt double-cropping is made, using a Tobit regression model. Tobit makes use of more of the information in the data set than do logit or probit and explains not only the decision to double-crop but also the rate of adoption. The paper considers factors such as profit and risk perceptions and risk which have not been included in the past models used to explain adoption of technology. The results show that risk perception is important. Contrary to the findings of some other adoption studies, this decision is not influenced by human capital factors. The farmers who double-crop are more highly leveraged and appear to do so... |
| Tipo: Journal Article |
Palavras-chave: Crop Production/Industries. |
| Ano: 1992 |
URL: http://purl.umn.edu/29630 |
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| Akridge, Jay T.. |
| The market for agribusiness extension activities and programming is diverse, intensely competitive, and national or international in scope. It is a market that agricultural economists cannot serve alone. Despite these complexities, a strong agribusiness extension effort is critical to the success of agribusiness research and teaching programs. Agribusiness extension opportunities include extending traditional agricultural economics research, small business management programs, economic/technical education programs, and management education. Keys for conducting successful agribusiness extension programs include understanding client needs, locating and employing the best instructional talent available, and flawless execution of the activity. Stimulating... |
| Tipo: Journal Article |
Palavras-chave: Agribusiness; Teaching/Communication/Extension/Profession. |
| Ano: 1992 |
URL: http://purl.umn.edu/30387 |
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| Litzenberg, Kerry K.. |
| This paper presents a summary of work by various groups on the potential for agribusiness research by agricultural economists over the past decade. Methodology to establish research priorities in agribusiness are reviewed. This review leads to a consideration of the agribusiness research issues including: funding sources, identifying users of agribusiness research, data needs, and limitations of agribusiness research programs. The final part of the paper presents a potpourri of suggested research initiatives in agribusiness research for agricultural economists. Research in these areas may be difficult for a number of reasons including: decreased reliance on economic theory as the sole paradigm, providing competitive advantage to a single agribusiness firm... |
| Tipo: Journal Article |
Palavras-chave: Agribusiness; Research and Development/Tech Change/Emerging Technologies. |
| Ano: 1992 |
URL: http://purl.umn.edu/30382 |
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| Heimlich, Ralph E.; Barnard, Charles H.. |
| Metropolitan agriculture is not homogeneous. This paper delves beneath metropolitan county averages using data on individual farms in the Northeast classified into three statistically distinct types. A small group of adaptive farms profit from intensive production on smaller acreage to accommodate themselves to the urban environment. Traditional farms have increased costs and pressures on their more extensive operations without compensating increases in revenue from better-adapted enterprises. A large group of recreational farms subsidize small-farm activities from nonfarm income. Operating characteristics of each farm type are presented and their importance to metropolitan agriculture is assessed. Implications for preserving farming and farmland in... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Community/Rural/Urban Development; Land Economics/Use. |
| Ano: 1992 |
URL: http://purl.umn.edu/28849 |
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| Registros recuperados: 2.472 | |
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