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| Registros recuperados: 2.030 | |
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| Stegenga, H.; Vroman, M.. |
| Nine species of benthic marine algae are reported from the Caribbean island of Curaçao for the first time: Chlorophyta: Derbesia marina and Trichosolen longipedicellata; Phaeophyta: Ectocarpus rhodochortonoides, Feldmannia elachistaeformis, Hecatonema floridanum, Herponema tortugense and Sphacelaria novae-hollandiae; •; Rhodophyta: Polysiphonia scopulorum and Polysiphonia sphaerocarpa. The Curaçao algal flora, with at present about 350 species recorded with reasonable certainty, equals some of the richest known areas in the Caribbean. |
| Tipo: Article / Letter to the editor |
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| Ano: 1988 |
URL: http://www.repository.naturalis.nl/record/525642 |
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| Berck, Peter. |
| This paper tests the hypothesis that the net of extraction cost price of a natural resource does not change with volume. The hypothesis is shown to he a consequence of Hotelling’s theory. The tests are performed on equations estimated by a nonparametric regression (ACE), and we show that the usual least squares estimation techniques are not general enough to successfully perform the test. The test rejects the pure form of the Hotelling theory and shows that it is necessary to adjust sale prices for volume sold. |
| Tipo: Working or Discussion Paper |
Palavras-chave: Natural resources; Prices; Regression analysis. |
| Ano: 1988 |
URL: http://purl.umn.edu/43665 |
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| Wegener, Malcolm K.; Vinning, Grant S.. |
| Agricultural Economics training is well developed at both undergraduate and postgraduate levels at the University of Queensland. The undergraduate subjects in this discipline are formally listed in the schedules for both the B.Agr.Sc. and the B.Econ. degrees. However, students enrolled for many other degrees (e.g. B.A., B.Com., B.E., B.Sc.) also take agricultural economics subjects as electives. Postgraduate students may enrol for a one year Diploma or two year Masters of Agricultural Studies. These awards are mainly coursework with a short dissertation. The research Masters and Ph.D. degrees have also attracted a significant number of successful candidates. |
| Tipo: Journal Article |
Palavras-chave: Teaching/Communication/Extension/Profession. |
| Ano: 1988 |
URL: http://purl.umn.edu/12570 |
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| Chevallier, Claude; Masson, Daniel. |
| La qualité des eaux de surface constitue périodiquement un sujet de controverse et de polémiques entre professionnels agricoles et conchylicoles charentais. Le débat reste centré sur la valorisation agricole des zones de marais littoraux. La création croissante d'îlots de culture drainés, souvent à proximité immédiate des zones conchylicoles, suscite l'inquiétude quant à la qualité des eaux d'aval. Il nous a paru nécessaire d'établir un état succinct des connaissances en la matière afin d'éviter l'usage d'arguments parfois irrationnels et de favoriser le dialogue entre les partenaires ; mais il nous paraît tout aussi important de montrer que la qualité des eaux de surface, question essentielle pour l'aménagement régional dépasse le seul cadre des marais :... |
| Tipo: Text |
Palavras-chave: Conchyliculture; Circulation des eaux; Effluent d'élevage; Charente-Maritime; Agriculture; Eau; Engrais. |
| Ano: 1988 |
URL: http://archimer.ifremer.fr/doc/00015/12664/9553.pdf |
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| Registros recuperados: 2.030 | |
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