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Autor  |
Ganguly, S.; Chaudhuri, K. |
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Titel |
A note on an extension of Schaefer's model |
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Zeitschrift, Artikel |
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Jahr |
1991 |
Publikation |
ECOL. MODEL. |
Kurztitel der Zeitschrift |
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55 |
Ausgabe |
1-2 |
Seiten |
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Schlüsselwörter |
Statistik, population, modell, algorithmus |
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Zusammenfassung |
Schaefer's model on the exploitation of a single species fish community obeying the logistic law of growth has been modified by adopting an alternative functional form for the harvest rate. The stability of the nontrivial steady state is discussed. The existence of a bionomic equilibrium is proved. The problem for optimal exploitation of the fishery is studied by using variational calculus. Some results are numerically computed to make a comparative study of Schaefer's model and the present one. |
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nein |
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Rufnummer |
435 |
Signatur |
2239 |
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Autor |
Krivan, V.; Seda, J. |
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Titel |
Application of a guaranteed regression model to trophic interaction in an aquatic system |
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Zeitschrift, Artikel |
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Jahr |
1989 |
Publikation |
ECOL. MODEL. |
Kurztitel der Zeitschrift |
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49 |
Ausgabe |
1-2 |
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Ökosystem, modell, interaktion, trend, fisch, statistik |
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The method of guaranteed estimation is used to estimate the unknown parameters of two nonlinear regression models. The first describes the relations between the body size structure of zooplankton and the biomass of planktivorous fish. The second estimates time-lag between the dynamics of cladoceran egg production and dynamics of phytoplankton. |
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nein |
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Rufnummer |
422 |
Signatur |
2226 |
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| Permalink für diesen Eintrag |
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Autor |
Sekine, M.; Nakanishi, H.; Ukita, M.; Murakami, S. |
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Titel |
A shallow-sea ecological model using an object-oriented programming language |
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Zeitschrift, Artikel |
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Jahr |
1991 |
Publikation |
ECOL. MODEL. |
Kurztitel der Zeitschrift |
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57 |
Ausgabe |
3-4 |
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Ökosystem, modell, oop, methode, theorie |
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Zusammenfassung |
The purpose of this study is to construct a model that can predict the impact on fisheries caused by coastal development activities. To accomplish this, many species of fish must be incorporated in the model, because each type of fish has a different value as a fishery resource and a different behavior for the same impact. In addition the effect of fish swimming must be considered because even when the total resource amount of fish does not change, fish may still disappear from the object area. These factors make the model structure complicated. Meanwhile, a new concept called “object oriented programming” (OOP) is attracting the attention of modellers. In this paper, we have constructed a model called the “shallow-sea ecological model” (SSEM), by using Smalltalk, which is representative of the OOP language. This showed that the fishing ground environment are expressed very flexibly and plainly by Smalltalk. |
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nein |
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Rufnummer |
405 |
Signatur |
2209 |
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| Permalink für diesen Eintrag |
