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Verweise |
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Autor |
Pedroli, J.-C.; Zaugg, B.; Kirchhofer, A. |
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Titel |
Verbreitungsatlas der Fische und Rundmäuler der Schweiz |
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Jahr  |
1991 |
Publikation |
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Kurztitel der Zeitschrift |
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Seiten |
207 |
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Schlüsselwörter |
Fisch, Verbreitung, Gesamtwerk |
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Zusammenfassung |
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Herausgeber |
Schweizerisches Zentrum für kartographische Erfassung der Fauna |
Erscheinungsort |
Neuchatel |
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0 |
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ISBN |
ISBN 2-88414-000-X |
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1260 |
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Autor |
Pelz, G. R. |
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Titel |
Lebensraum und Fischfauna der Grenzgewässer Mosel – Sauer – Our |
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Jahr |
1991 |
Publikation |
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Kurztitel der Zeitschrift |
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Seiten |
276 |
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Schlüsselwörter |
Fisch, Verbreitung, Vorkommen, Kartierung |
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Herausgeber |
Advanced Biology Verlagsgesellschaft |
Erscheinungsort |
Köln |
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0 |
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ISSN |
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ISBN |
ISBN 3-926965-00-2 |
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Signatur |
1270 |
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Autor |
Ragen, T. J. |
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Titel |
The estimation of theoretical population levels for natural populations |
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Jahr |
1991 |
Publikation |
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Kurztitel der Zeitschrift |
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Schlüsselwörter |
environmental-conditions; biological-production; marine-mammals; marine-fish; population-dynamics; size-distribution; computer-programs; simulations-; frequency-analysis; migratory-species; Callorhinus-ursinus; Atractoscion-nobilis; Seriola-lalandei; Stereolepis-gigas; INE,-USA,-California; ISW,-USA,-Alaska,-St.-Paul-Island, carrying-capacity |
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Zusammenfassung |
The focus of this dissertation was the estimation of theoretical reference levels such as K, the environmental carrying capacity, and MNPL, the maximum net productivity level, for three fishes off Southern California and for the northern fur seal (Callorhinus ursinus) population of St. Paul Island, Alaska. The estimation techniques were based on computer modeling of historical population trends. The assessment of these theoretical reference levels for nature populations is fundamentally important to the development and testing of concepts in theoretical ecology and population dynamics. In the first study, maximum-likelihood estimates of pre-exploitation biomass were made for the white seabass (Atractoscion nobilis) and the yellowtail (Seriola lalandei) by assuming that development of corresponding commercial fisheries led to a shift in size distributions of these fishes, as indicated by records of the Avalon Tuna Club, Santa Catalina Island, California. Pre-exploitation biomass for Southern California populations of both these fishes was estimated to be about 20,000 tons. The pre-exploitation biomass of the giant sea bass (Stereolepis gigas) was estimated to be 1300 tons. Due to insufficient natural history information, this estimate was based on commercial catch records only. In the second study, estimates of theoretical reference levels for the northern fur seal population of St. Paul Island were based on computer simulations of pup production from 1912 to 1970, repetitive simulations were used to construct frequency distributions of estimates for MNPL, K, the number of pups born at MNPL and K, and the ratio MNPL/K. These distributions serve as a measure of the confidence that can be placed in single estimates of reference levels, and thereby provide a general context within which these reference levels can be evaluated. The final study of this dissertation investigated the pelagic migration of northern fur seal pups. Results indicated that initial migration paths for these pups are more widely dispersed than previously assumed. This information contributes to the understanding of northern fur seal life histories. A fuller understanding of life history information will eventually facilitate more accurate modeling of northern fur seal population dynamics. (DBO) |
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Rufnummer |
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Signatur |
1311 |
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Autor |
Riethe, P. |
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Titel |
Hildegard von Bingen: Das Buch von den Fischen |
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Jahr |
1991 |
Publikation |
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Kurztitel der Zeitschrift |
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Band |
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Ausgabe |
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Seiten |
150 |
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Schlüsselwörter |
Fisch, Historisch |
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Zusammenfassung |
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Adresse |
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Organisation |
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Abschlussarbeit |
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Herausgeber |
Otto Müller Verlag |
Erscheinungsort |
Salzburg |
Editor |
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Originaltitel |
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Geprüft |
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Rufnummer |
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Signatur |
1363 |
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Autor |
Whitmarsh, D.; Voit, E. O.; Balthis, W. L.; Holser, R. A. |
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Titel |
A spreadsheet model of renewable resource exploitation – Hierarchical Monte Carlo modeling with S-distributions: Concepts and illustrative analysis of mercury contamination in king mackerel |
Typ |
Buch |
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Jahr |
1991 |
Publikation |
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Kurztitel der Zeitschrift |
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Band |
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Ausgabe |
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Seiten |
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Schlüsselwörter |
Renewable-resources; Mathematical-models; Natural-resources; Economics-; Dynamic-analysis, Environmental-economics, Monte-Carlo-method; simulation-; numerical-analysis; mercury-; bioaccumulation-; fish-; quantitative-analysis; statistical-models; data-processing; pollution-effects; mathematical-models; scomberomorus-cavalla, S-distributions |
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Zusammenfassung |
Increasing numbers of students now study natural resource and environmental economics at undergraduate level, and this interest in the subject has been matched by a corresponding expansion in the number of textbooks and other learning material available for use. Unfortunately one very important aspect of natural resource economics which is often not adequately dealt with in the undergraduate literature concerns the question of dynamics: how rapidly will a resource become exploited, and what time path will it follow? These issues are particularly relevant to the management of renewable resources such as fish stocks whose survival depends on factors such as the rate of entry and exit by the exploiting firms, and the ability of the resource to recover from the effects of intense harvesting. The fault of most textbooks stems not from a failure to cover the question of dynamics, but rather that the treatment is often too advanced or mathematical for the majority of students. Computers can make a useful contribution to our understanding of the dynamics of natural resource exploitation, and in this example the case of marine commercial fishery exploited under 'open-access' conditions is considered. The quantitative assessment of environmental contaminants is a complex process. It involves nonlinear models and the characterization of variables, factors, and parameters that are distributed and dependent each other. Assessments based on point estimates are easy to perform, but since they are unreliable, Monte Carlo simulations have become a standard procedure. Simulations pose two challenges: They require the numerical characterization of parameter distributions and they do not account for dependencies between parameters. This paper offers strategies for dealing with both challenges. The first part discusses the characterization of data with the S-distribution. This distribution offers several advantages, which include simplicity of numerical analysis, flexibility in shape, and easy computation of quantiles. The second part outlines how the S-distribution can be used for hierarchical Monte Carlo simulations. In these simulations the selection of parameter values occurs sequentially, and each choice depends on the parameter values selected before. The method is illustrated with preliminary simulation analyses that are concerned with mercury contamination in king mackerel (Scomberomorus cavalla). It is demonstrated that the results of such hierarchical simulations are generally different from those of traditional Monte Carlo simulations. |
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Zu bestellen |
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Rufnummer |
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Signatur |
1809 |
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Autor |
Zerrath, H. |
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Titel |
Sprintleistungen einheimischer Klein- und Jungfische in Sohlgleitenmodellen-Daten zur Bewertung von Fischaufstiegsanlagen |
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Zeitschrift, Artikel |
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Jahr |
1991 |
Publikation |
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Kurztitel der Zeitschrift |
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Seiten |
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Schlüsselwörter |
Fisch, Sohlgleitenmodell, Fischaufstiegsanlage |
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Zusammenfassung |
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Adresse |
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Organisation |
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Abschlussarbeit |
Diplomarbeit |
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Sprache |
de |
Sprache der Zusammenfassung |
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Geprüft |
nein |
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Rufnummer |
Blank @ cathi @ |
Signatur |
2713 |
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Autor |
Arnold, A. |
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Titel |
Eingebürgerte Fischarten |
Typ |
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Jahr |
1990 |
Publikation |
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Kurztitel der Zeitschrift |
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Band |
602 |
Ausgabe |
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Seiten |
144 |
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Schlüsselwörter |
Fisch, Neozoon |
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Zusammenfassung |
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A. Ziemsen Verlag |
Erscheinungsort |
Wittenberg |
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Titel der Reihe |
Die Neue Brehm-Bücherei |
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Signatur |
100 |
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Autor |
Beisenherz, W.; Späh, H. |
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Titel |
Die Fische Ostwestfalens |
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Jahr |
1990 |
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Seiten |
132 |
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Schlüsselwörter |
Fisch, Verbreitung, Vorkommen, Kartierung |
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Naturwissenschaftlicher Verein |
Erscheinungsort |
Bielefeld |
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ISBN |
ISBN 3-928232-00-2 |
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171 |
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Autor |
Frank, C.; Jungbluth, J. H.; Richnovszky, A. |
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Titel |
Die Mollusken der Donau vom Schwarzwald bis zum Schwarzen Meer |
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Jahr |
1990 |
Publikation |
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Seiten |
142 |
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Schlüsselwörter |
Muschel |
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Budapest |
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436 |
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Autor |
He, X. |
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Titel |
Effects of predation on a fish community: A whole lake experiment |
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Jahr |
1990 |
Publikation |
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Schlüsselwörter |
predation-; interspecific-relationships; freshwater-fish; population-dynamics; Esox-lucius; Phoninus-eos; Lepomis-; Semotilus-atromaculatus; freshwater-ecology |
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Zusammenfassung |
Studies of predator-prey interactions have been limited to laboratories or relatively small scale field experiments because of logistic difficulties in large scale field experiments. Much evidence has suggested that predictions based on small scale experiments on predator-prey interactions may not be simply extended to large scales, e.g. whole system. This study was designed to examine predation effects on a prey fish assemblage at the whole lake scale. After a year of premanipulation study, northern pike (Esox lucius) were introduced into a small piscivore-free lake inhabited by 14 species of fishes. In the third and fourth years, the lake was divided by a large mesh fence and northern pike were introduced into one half of the lake. Predation effects on individual prey population were estimated for both direct effects (i.e., consumption of prey species) and indirect effects, including habitat changes associated with predator avoidance behavior, increase of emigration rates and changes of population size structure. The relative importance of direct versus indirect effects was examined using randomized intervention analysis along with a model that quantifies the indirect effects. Decreases of prey fish biomass due to increased emigration was at least as great as that due to the direct effect of consumption when prey biomass was high (>40 kg/ha) but not when prey biomass was low (<30 kg/ha). Significant indirect effects included dramatically decreased abundance of the dominant species (northern redbelly dace, Phoxinus eos), increase of some rare species (sunfish, Lepomis spp. and creek chub, Semotilus atromaculatus), and decreased mean sizes of redbelly dace. Indirect effects occurred rapidly and were most apparent immediately following the introduction of northern pike. Community responses to northern pike predation included changes of species composition, species diversity and community stabilities. The fish communities were significantly different among the pre-pike period, pike period and post-pike period. The greatest variance was related to abundances of redbelly dace and sunfish. However, predation effects on the prey fish community depended on the observational scales used to determine community structure. (DBO) |
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628 |
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