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Labelle, M. (1994). A likelihood method for estimating Pacific salmon escapement based on fence counts and mark-recapture data (Vol. 51).
Zusammenfassung: Pacific salmon (Oncorhynchus spp.) escapements in natural streams are often determined by conducting fence counts in conjunction with mark-recapture operations. Typical field conditions are characterized by protracted floods, undetected immigration, variation in sampling rates, mortality during the census periods, small sample sizes, and few successive recaptures. Closed population models tend to overestimate escapement under such conditions, and traditional open population models cannot always be relied on due to the lack of sufficient data. A likelihood-based estimation method was specifically designed for such conditions. A distinguishing feature of this model is that individual recapture histories are not required for parameter estimation. The model is also structured to incorporate ancillary data in the estimation process to improve the precision and accuracy of the estimates. The model is described in detail, and suggestions are made to facilitate its application.
Schlüsselwörter: capt-recapt, methode, ML, modell, statistik, simulation
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Law, P. M. W. (1994). Simulation Study of salmon Carcass Survey Capture-Recapture Methods (Vol. 80).
Schlüsselwörter: capt-recapt, Methode, Vergleich, Modell, Fisch, Statistik
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Leuner, E. (1994). Über die Substratansprüche der Mühlkoppe (Cottus gobio) (Vol. 1994).
Schlüsselwörter: Fisch, Cottus, Biologie, Beschreibung, Substrat
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McGarvey, R. (1994). An age-structured open-access fishery model (Vol. 51).
Zusammenfassung: A dynamic model for open-access fisheries is presented. In addition to density dependence in recruitment and fishing effort changing in proportion to the level of profit fishermen earn which characterizes previous open-access models, it incorporates full age structure for the fish stock, lognormal environmental recruitment variability, and gear selectivity. The predator-prey cycling solution of the original Schaefer dynamic model, and subsequent open-access models, persists for these model extensions. Density dependence in recruitment induces greater global stability. Environmental recruitment variability, common in marine populations, is destabilizing in the neighborhood of the open-access equilibrium. Approximating model steady states of effort and catch by the corresponding averages from data time series underlies a new algorithm of parameter evaluation, applied here to an open-access model of the Georges Bank sea scallop (Placopecten magellanicus) fishery.
Schlüsselwörter: fischerei, Population, Mathematik, Modell, Statistik, CPUE
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McGarvey, R. (1994). An age-structured open-access fishery model (Vol. 51).
Zusammenfassung: A dynamic model for open-access fisheries is presented. In addition to density dependence in recruitment and fishing effort changing in proportion to the level of profit fishermen earn which characterizes previous open-access models, it incorporates full age structure for the fish stock, lognormal environmental recruitment variability, and gear selectivity. The predator-prey cycling solution of the original Schaefer dynamic model, and subsequent open-access models, persists for these model extensions. Density dependence in recruitment induces greater global stability. Environmental recruitment variability, common in marine populations, is destabilizing in the neighborhood of the open-access equilibrium. Approximating model steady states of effort and catch by the corresponding averages from data time series underlies a new algorithm of parameter evaluation, applied here to an open-access model of the Georges Bank sea scallop (Placopecten magellanicus) fishery.
Schlüsselwörter: modell, statistik, population, dynamik, algorithmus
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Messmer, M., & Lehmann, R. (1994). Bedeutung der Ökomorphologie für die Zusammensetzung und Struktur der Fischfauna in der Suhre unter spezieller Berücksichtigung des Schneiders (Alburnoides bipunctatus). Bern: Eidgenössische Technische Hochschule.
Schlüsselwörter: Fisch, Schneider, Alburnoides bipunctatus
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Nellen, W. (1994). Überlegungen zu fischereilichen Perspektiven der Elbe (Vol. 45).
Schlüsselwörter: Fisch, Fischerei, Elbe
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Nesemann, H. (1994). Die Krebsegel im Gebiet der oberen Donau (Österreich, Deutschland) mit Bestimmungsschlüssel zu den europäischen Arten (Clitellata, Branchiobdellida).
Schlüsselwörter: Krebs, Parasit, Krebsegel, Bestimmung
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Nowak, E., Blab, J., & Bless, R. (1994). Rote Liste der gefährdeten Wirbeltiere in Deutschland (0thVol. Heft 42). Bonn - Bad Godesberg: Schriftenreihe für Landschaftspflege und Naturschutz.
Schlüsselwörter: Fisch, Rote Liste
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O'Rourke, J. (1994). Computational Geometry in C. Cambridge: Cambridge University Press.
Schlüsselwörter: Grafik, C, Theorie, Listing
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