Fotland, A., Mehl, S., & Sunnanaa, K. (1995). Methods of index calculation and presentation of fish abundance data using standard computer programs.
Zusammenfassung: Standard 0-group indices and distribution maps are now produced based on hand-drawn maps using AutoCad with some additional procedures. This paper briefly describes the method. The paper further describes ways of importing coastlines and survey data directly into standard computer programs such as AutoCad and SAS. Standard methods are used for gridding data, producing isolines and further calculation of abundance indices and presentation of distributions. Interactive editing of distribution maps are made, which makes corresponding automatic updating of indices possible.
Schlüsselwörter: fishery-management; fishery-statistics; stock-assessment
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Frank, C., Jungbluth, J. H., & Richnovszky, A. (1990). Die Mollusken der Donau vom Schwarzwald bis zum Schwarzen Meer. Budapest.
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Fricke, W., Neugirg, B., & Pitzke-Widdig, C. (1999). Schutz bedrohter Tierarten in den Fließgewässern Mittelhessens – Chancen und Aktivitäten. Berichte der Akademie für Natur- und Umweltschutz Hessen. Wetzlar: NZH-Verlag.
Schlüsselwörter: Artenschutz, Fließgewässer, Renaturierung, Wanderung, Muschel, Fisch, Krebs, Hessen
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Fritsch, A. (1894). Der Elblachs: Eine biologisch-anatomische Studie. Prag: Selbstverlag des Autors.
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Gerhardt, P. (1904). Fischwege und Fischteiche. Leipzig: Wilhelm Engelmann Verlag.
Schlüsselwörter: Fisch, Fischteich, Fischaufstiegshilfe
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Gesner, C. (1995). Vollkommenes Fischbuch: darstellend eine Abbildung aller grosser und kleiner Fische und seltzamer Meerwunder sammt einer umbstaendlichen Beschreibung. – Unveränderter Nachdruck der Ausgabe Frankfurt am Main, Serlin, 1670. Hannover: Schlütersche Verlagsanstalt.
Schlüsselwörter: Fisch, Historisch, Krebs
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Hager, J. (1983). Edelkrebse. Biologie, Zucht, Bewirtschaftung. Graz - Stuttgart: Leopold Stocker Verlag.
Schlüsselwörter: Krebs, Biologie, Fortpflanzung
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Härry, A. (1917). Die Fischwege an Wehren und Wasserwegen in der Schweiz. Zürich und Leipzig: Verlag Rauscher und Co.
Schlüsselwörter: Fisch, Fischaufstiegshilfe, Wehr
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Hauter, C. (1910). Die Fische der Rheinpfalz und die Krebse. Speyer: Kranzbühler Verlag.
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He, X. (1990). Effects of predation on a fish community: A whole lake experiment.
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)
Schlüsselwörter: predation-; interspecific-relationships; freshwater-fish; population-dynamics; Esox-lucius; Phoninus-eos; Lepomis-; Semotilus-atromaculatus; freshwater-ecology
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